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| Spitting Transmission [message #352074] |
Sun, 09 February 2020 11:02  |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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After not having any issues with the new transmission for the first 5,000 miles, it has taken to spitting some fluid out of the vent (yes, I have an elbow on it with a hose to the outside of the frame in place of the vent cap) It lost close to a quart on the trip to Big Bend (1333 miles).
Is this a symptom of a partially plugged filter? I am planning to service it anyway, and probably should have done a first fluid change sooner than at 7500 miles.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
[Updated on: Sun, 09 February 2020 11:12] Report message to a moderator |
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| Re: Spitting Transmission [message #352209 is a reply to message #352074] |
Sat, 15 February 2020 17:34  |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Just guessing but something is introducing air bubbles raising fluid level. Could be filter seal or I have heard pump whine on a TH 700 series with clogged filter. But that was on 130K mile car. There should not be much friction material in the fluid on such a new build.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: Spitting Transmission [message #352210 is a reply to message #352074] |
Sat, 15 February 2020 19:24 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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That is a real bummer.
I cant imagine a clogged filter in your case. I would wonder about 2 things 1st.
1st is fluid level.
2nd is somehow your vent system or something in the engine compartment is causing some vacuum or airflow that is "sucking" some fluid out the vent.
Talk to ray E. He fought this for a while. Ended up being internal on his tranny. But hopefully that is not your case(his was not recently rebuilt).
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: Spitting Transmission [message #352211 is a reply to message #352210] |
Sat, 15 February 2020 21:54 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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I just drained it and dropped the pan this afternoon. The fluid looked like new coming out and there was not any excessive clutch material in the pan. I'm thinking maybe the new clutches etc may have lost a bit more material on 'break-in' than they would have regularly. I am (of course) going to replace the filter, with new O-rings and be careful with the fluid level. One of the two O-rings on the filter had a little kink in it, so it might have been sucking a little air.
I am running Mobil-1 full synthetic fluid in the transmission. I'm pretty sure everything is Okay with it. I think I'll put a catch can on the vent hose so I can monitor the situation better.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] Spitting Transmission [message #352215 is a reply to message #352211] |
Sun, 16 February 2020 09:38 |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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If the pan is still off calibrate the dipstick, there's significant variations in them.1. Put a straight edge across the bottom of the transmission case where the pan bolts on.2. Make sure the dipstick is all the way in.3. Put a temporary mark on the dipstick where it hits the straight edge.4. Measure down 1/4" on the dipstick and put a permanent mark. That is the correct HOT/FULL mark.Sent from my U.S.Cellular© Smartphone
-------- Original message --------From: Carl Stouffer via Gmclist Date: 2/15/20 9:55 PM (GMT-06:00) To: gmclist@list.gmcnet.org Cc: Carl Stouffer Subject: Re: [GMCnet] Spitting Transmission I just drained it and dropped the pan this afternoon. The fluid looked like new coming out and there was not any excessive clutch material in thepan. I'm thinking maybe the new clutches etc may have lost a bit more material on 'break-in' than they would have regularly. I am (of course) goingto replace the filter, with new O-rings and be careful with the fluid level. One of the two O-rings on the filter had a little kink in it, so itmight have been sucking a little air. I am running Mobil-1 full synthetic fluid in the transmission. I'm pretty sure everything is Okay with it. I think I'll put a catch can on the venthose so I can monitor the situation better.-- Carl Stouffer'75 ex Palm BeachTucson, AZ.Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles,Solar battery charging. GMCSJ and GMCMI member_______________________________________________GMCnet mailing listUnsubscribe or Change List Options:http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: Spitting Transmission [message #352216 is a reply to message #352211] |
Sun, 16 February 2020 09:42 |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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If the pan is still off calibrate the dipstick, there's significant variations in them.
1. Put a straight edge across the bottom of the transmission case where the pan bolts on.
2. Make sure the dipstick is all the way in.
3. Put a temporary mark on the dipstick where it hits the straight edge.
4. Measure down 1/4" on the dipstick and put a permanent mark. That is the correct HOT/FULL mark.
Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: Spitting Transmission [message #352217 is a reply to message #352216] |
Sun, 16 February 2020 09:44 |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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Senior Member |
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My transmission was blowing fluid out of the dipstick tube. 1 gallon in 100 miles. Transmission had an internal pressure leak, after a complete rebuild all is good.
Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: Spitting Transmission [message #352224 is a reply to message #352217] |
Sun, 16 February 2020 19:32 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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This is a much smaller issue than that. It blew , maybe, a pint out in 500 miles. It just may have been overfilled. I read the post about calibration too late to do it this time, but I don't think there a significant problem (Crossing my fingers).
It's all back together.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: Spitting Transmission [message #352664 is a reply to message #352074] |
Mon, 09 March 2020 13:43 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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Update on this:
I serviced the transmission, changed the fluid (Mobil-1 Full Synthetic) and filter (ATP) and added a small catch can to the vent hose.
Last weekend, the GMCSJ had a small rally at a local casino about 25 miles from our home and there was no indication of any transmission fluid spitting out of the vent. Maybe 25 miles (each way with 10 miles on the freeway) was not enough of a test to see if everything is okay, but I'm hoping so. Still don't know why it did it. Maybe I overfilled it the last time I checked the level.
I guess the real test will be our next multi hundred mile trip in early April.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] Spitting Transmission [message #352668 is a reply to message #352664] |
Mon, 09 March 2020 14:25 |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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Senior Member |
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The old filter O-Ring may have been leaking. A new filter and O-Rings may have solved the problem Sent from my U.S.Cellular© Smartphone
-------- Original message --------From: Carl Stouffer via Gmclist Date: 3/9/20 1:44 PM (GMT-06:00) To: gmclist@list.gmcnet.org Cc: Carl Stouffer Subject: Re: [GMCnet] Spitting Transmission Update on this:I serviced the transmission, changed the fluid (Mobil-1 Full Synthetic) and filter (ATP) and added a small catch can to the vent hose.Last weekend, the GMCSJ had a small rally at a local casino about 25 miles from our home and there was no indication of any transmission fluidspitting out of the vent. Maybe 25 miles (each way with 10 miles on the freeway) was not enough of a test to see if everything is okay, but I'mhoping so. Still don't know why it did it. Maybe I overfilled it the last time I checked the level.I guess the real test will be our next multi hundred mile trip in early April.-- Carl Stouffer'75 ex Palm BeachTucson, AZ.Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles,Solar battery charging. GMCSJ and GMCMI member_______________________________________________GMCnet mailing listUnsubscribe or Change List Options:http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: Spitting Transmission [message #352693 is a reply to message #352671] |
Tue, 10 March 2020 12:12 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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Thanks Larry,
Yes I am aware of the transmission filter issue. I measured the neck on the new ATP filter and it was right at .75 inches. I also routinely install two O-rings on those, so did the transmission builder. One of the two that he installed had a little bit of a kink in it. I think that was where the original problem came from. Perhaps it was sucking a tiny bit of air and causing the fluid to foam a little.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: Spitting Transmission [message #358094 is a reply to message #352693] |
Wed, 26 August 2020 22:05 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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Here's a little followup to a thread from back in March:
After discussing the transmission "spitting" issue with my "mechanical team" (Jim the mechanic and Logan the transmission builder) it was suggested that I take a second look at my transmission vent hose routing. I had the hose going directly from the vent elbow on top of the transmission, to the outside of the frame on the left side, going downhill all the way.
The theory was that this routing was somehow creating a siphon condition that was actually sucking fluid out of the vent. It really didn't make sense, since the vent is at the top of the transmission and the only thing that should come out of it would be a little air in the form of pressure relief. I went with their suggestion and put a longer hose on the vent with kind of a reverse trap in it. In other words, I routed the hose up almost to the bottom of the floor, tying it to the back of the step, before running it out the side.
Problem solved.
On our 950 mile Summer trip last month, no fluid was lost from the transmission, in spite of several long pulls up 6% or steeper grades in second gear (at temperatures well in excess of 100 degrees). Part of that was the same route (I-17 north of Phoenix) where I had the problem back in March. There were several shorter trips in between those two, but I didn't want to draw any conclusions until I took a longer trip.
Hope this helps if anyone else has experienced this problem with their transmissions.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] Spitting Transmission [message #358096 is a reply to message #358094] |
Wed, 26 August 2020 22:25 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Carl,
I've never had such a problem, but back when I installed a transmission
vent hose 10+ years ago, I routed the open end of it into a pill bottle
mounted on the back of the rear mount crossmember. That allows me to
monitor for drainage from the vent, and prevents any vacuum creation or
critter residence. Fact is, after all that time, there's less than 1/8" of
ATF in the bottle.
Just another idea for how to terminate the drains.
Ken H.
On Wed, Aug 26, 2020 at 11:06 PM Carl Stouffer via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Here's a little followup to a thread from back in March:
>
> After discussing the transmission "spitting" issue with my "mechanical
> team" (Jim the mechanic and Logan the transmission builder) it was suggested
> that I take a second look at my transmission vent hose routing. I had the
> hose going directly from the vent elbow on top of the transmission, to the
> outside of the frame on the left side, going downhill all the way.
>
> The theory was that this routing was somehow creating a siphon condition
> that was actually sucking fluid out of the vent. It really didn't make
> sense, since the vent is at the top of the transmission and the only thing
> that should come out of it would be a little air in the form of pressure
> relief. I went with their suggestion and put a longer hose on the vent
> with kind of a reverse trap in it. In other words, I routed the hose up
> almost to the bottom of the floor, tying it to the back of the step,
> before running it out the side.
>
> Problem solved.
>
> On our 950 mile Summer trip last month, no fluid was lost from the
> transmission, in spite of several long pulls up 6% or steeper grades in
> second gear
> (at temperatures well in excess of 100 degrees). Part of that was the
> same route (I-17 north of Phoenix) where I had the problem back in March.
> There were several shorter trips in between those two, but I didn't want
> to draw any conclusions until I took a longer trip.
>
> Hope this helps if anyone else has experienced this problem with their
> transmissions.
> --
> Carl Stouffer
> '75 ex Palm Beach
> Tucson, AZ.
> Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive,
> Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American
> Eagles,
> Solar battery charging. GMCSJ and GMCMI member
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Spitting Transmission [message #358097 is a reply to message #358096] |
Wed, 26 August 2020 22:38 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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Ken,
I have a pill bottle (Costco size extra Strength Excedrin  ) on the hose as well. It filled up on the way to Camp Verde and again on the way home last March. Since I have rerouted the vent hose, next to nothing. I can't explain why fluid was coming out of the vent, but it was.
Weird, huh?
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] Spitting Transmission [message #358098 is a reply to message #358096] |
Wed, 26 August 2020 22:32 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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How i did it, also.
Jim Hupy
Salem, Oregon
On Wed, Aug 26, 2020, 8:26 PM Ken Henderson via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Carl,
>
> I've never had such a problem, but back when I installed a transmission
> vent hose 10+ years ago, I routed the open end of it into a pill bottle
> mounted on the back of the rear mount crossmember. That allows me to
> monitor for drainage from the vent, and prevents any vacuum creation or
> critter residence. Fact is, after all that time, there's less than 1/8" of
> ATF in the bottle.
>
> Just another idea for how to terminate the drains.
>
> Ken H.
>
> On Wed, Aug 26, 2020 at 11:06 PM Carl Stouffer via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> Here's a little followup to a thread from back in March:
>>
>> After discussing the transmission "spitting" issue with my "mechanical
>> team" (Jim the mechanic and Logan the transmission builder) it was
> suggested
>> that I take a second look at my transmission vent hose routing. I had
> the
>> hose going directly from the vent elbow on top of the transmission, to
> the
>> outside of the frame on the left side, going downhill all the way.
>>
>> The theory was that this routing was somehow creating a siphon condition
>> that was actually sucking fluid out of the vent. It really didn't make
>> sense, since the vent is at the top of the transmission and the only
> thing
>> that should come out of it would be a little air in the form of pressure
>> relief. I went with their suggestion and put a longer hose on the vent
>> with kind of a reverse trap in it. In other words, I routed the hose up
>> almost to the bottom of the floor, tying it to the back of the step,
>> before running it out the side.
>>
>> Problem solved.
>>
>> On our 950 mile Summer trip last month, no fluid was lost from the
>> transmission, in spite of several long pulls up 6% or steeper grades in
>> second gear
>> (at temperatures well in excess of 100 degrees). Part of that was the
>> same route (I-17 north of Phoenix) where I had the problem back in March.
>> There were several shorter trips in between those two, but I didn't want
>> to draw any conclusions until I took a longer trip.
>>
>> Hope this helps if anyone else has experienced this problem with their
>> transmissions.
>> --
>> Carl Stouffer
>> '75 ex Palm Beach
>> Tucson, AZ.
>> Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive,
>> Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American
>> Eagles,
>> Solar battery charging. GMCSJ and GMCMI member
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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