Home » Public Forums » GMCnet » Transmission ?? (Leak)
Transmission ?? [message #327384] |
Thu, 21 December 2017 10:42 |
Bierman
Messages: 46 Registered: May 2017 Location: SW Florida
Karma: 0
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This is from a limited mechanical member. The transmission leaks out a little fluid after sitting for a few weeks abd after a road trip. Is this normal? Is there an easy fix? Should I be worried
Also my speedometer reads 7 MPH slower than what I am going, I checked this out with gps and having another vehicle next to me, do not know what the PO has put in for final drive. Is there something I can check to see what the final drive is? Fixes to this problem? So when I am driving 55 I am actually going 62
Thanks for any and all input
Member, GMCI, Sunshine Statesman and Dixielanders
26' 1978 Eleganza II, new(rebuilt by Sirum) 403, Lenzi hubs and knuckles, front end by Ferrara
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Re: Transmission ?? [message #327385 is a reply to message #327384] |
Thu, 21 December 2017 11:32 |
jhbridges
Messages: 8412 Registered: May 2011 Location: Braselton ga
Karma: -74
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You may be leaking fluid around the trans dipstick if it isn't well sealed. Or from any of a number of other places. Best chance is wipe it clean, run around a bit, and see what's damp.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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Re: Transmission ?? [message #327388 is a reply to message #327385] |
Thu, 21 December 2017 13:00 |
tphipps
Messages: 3005 Registered: August 2004 Location: Spanish Fort, AL
Karma: 9
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Easiest way to check FD ratio would be driving a set speed, using the GPS, and check engine rpm with a tach. RPMs will give you an accurate idea of your final drive ratio. Record and report engine rpm at GPS speeds of 60, 65, and 70 mph. Smarter guys than me will give you an idea of your final drive ratio.
Tom
2012 Phoenix Cruiser model 2552
KA4CSG
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Re: Transmission ?? [message #327389 is a reply to message #327384] |
Thu, 21 December 2017 14:37 |
dshafer
Messages: 68 Registered: June 2016 Location: SW Ohio
Karma: 3
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Don't forget to consider tire size in your quest. Could also be that your chain drive has aftermarket gears. If your drive ratio is 3.21 the cover will only have eight bolts. All others have 10.
1977 26 foot 403
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Re: Transmission ?? [message #327394 is a reply to message #327384] |
Thu, 21 December 2017 16:49 |
NextGenGMC
Messages: 146 Registered: December 2017 Location: Washington State
Karma: -1
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Can the speedometer error be due to the wrong plastic gear installed in speedometer output housing on transmission?
I suppose one can pull it out, count the number of teeth, and compare it to the RPM vs. speed ratio to make sure it is correct one for the final drive combination.
Bierman wrote on Thu, 21 December 2017 08:42This is from a limited mechanical member. The transmission leaks out a little fluid after sitting for a few weeks abd after a road trip. Is this normal? Is there an easy fix? Should I be worried
Also my speedometer reads 7 MPH slower than what I am going, I checked this out with gps and having another vehicle next to me, do not know what the PO has put in for final drive. Is there something I can check to see what the final drive is? Fixes to this problem? So when I am driving 55 I am actually going 62
Thanks for any and all input
Vadim Jitkov
'76 Glenbrook 26'
Pullman, WA
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Re: Transmission ?? [message #327397 is a reply to message #327384] |
Thu, 21 December 2017 19:11 |
Bierman
Messages: 46 Registered: May 2017 Location: SW Florida
Karma: 0
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Took the coach for a little ride today then went underneath, could not see any leaks, the area around the dips stick was dry before and after the ride.
My concern with the leak is its not there for a few weeks maybe 3 after a road trip then all of a sudden I have a 6/7 inch circle on my driveway, this is not the first time.
I do not have a tach to check rpm, I have come accustomed to knowing my actually speed with the 7 MPH difference.
Member, GMCI, Sunshine Statesman and Dixielanders
26' 1978 Eleganza II, new(rebuilt by Sirum) 403, Lenzi hubs and knuckles, front end by Ferrara
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Re: [GMCnet] Transmission ?? [message #327399 is a reply to message #327394] |
Thu, 21 December 2017 19:37 |
jimk
Messages: 6734 Registered: July 2006 Location: Belmont, CA
Karma: 9
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You should contact us as we are the major supplier of final drives and can
assist you better. You do not need to purchase anything from us.
On Thu, Dec 21, 2017 at 2:49 PM, Vadim Jitkov
wrote:
> Can the speedometer error be due to the wrong plastic gear installed in
> speedometer output housing on transmission?
> I suppose one can pull it out, count the number of teeth, and compare it
> to the RPM vs. speed ratio to make sure it is correct one for the final
> drive
> combination.
>
>
> Bierman wrote on Thu, 21 December 2017 08:42
>> This is from a limited mechanical member. The transmission leaks out a
> little fluid after sitting for a few weeks abd after a road trip. Is this
>> normal? Is there an easy fix? Should I be worried
>> Also my speedometer reads 7 MPH slower than what I am going, I checked
> this out with gps and having another vehicle next to me, do not know what
>> the PO has put in for final drive. Is there something I can check to see
> what the final drive is? Fixes to this problem? So when I am driving 55 I
>> am actually going 62
>>
>> Thanks for any and all input
>
>
> --
> Vadim Jitkov
> '76 Glenbrook 26'
> Pullman, WA
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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Re: Transmission ?? [message #327404 is a reply to message #327384] |
Thu, 21 December 2017 20:38 |
Ray Erspamer
Messages: 1707 Registered: May 2007 Location: Milwaukee Wisconsin
Karma: -3
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Senior Member |
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Things to check for the leak....
1. Dipstick O-Ring
2. Pan gasket
3. Pan gasket bolts (put a small o-ring around each.
4. Shift lever O-Ring
5. Downshift wire connection O-Ring
6. Vac modulator O-Ring
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: Transmission ?? [message #327411 is a reply to message #327406] |
Fri, 22 December 2017 08:12 |
Fipp
Messages: 26 Registered: December 2017 Location: Aledo, Illinois
Karma: -1
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Junior Member |
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I too have speedometer issues but decided not to do much. My transmission leak mystified me also but found weep hole in the final drive leaking and the great Bob Dunohugh suggested leak in the seal between the transmission and final drive. Hello Bob, I think I finally got on this site, and tried to call you this morning. Merry Xmas everyone!
Scott D. Fippinger
Aledo, Illinois
1976 Royale
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Re: Transmission ?? [message #327419 is a reply to message #327384] |
Fri, 22 December 2017 10:53 |
Bierman
Messages: 46 Registered: May 2017 Location: SW Florida
Karma: 0
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Thanks for all the advice, it really helps to have so many chip in. After my Christmas get away I will be checking out all of the suggestions.
Enjoy the Holidays
Merry Christmas and God Bless
JIM K, When I call Applied should I ask for you?
Member, GMCI, Sunshine Statesman and Dixielanders
26' 1978 Eleganza II, new(rebuilt by Sirum) 403, Lenzi hubs and knuckles, front end by Ferrara
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Re: Transmission ?? [message #327432 is a reply to message #327384] |
Sat, 23 December 2017 08:51 |
Bierman
Messages: 46 Registered: May 2017 Location: SW Florida
Karma: 0
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Could that be the reason why it takes a couple of weeks sitting in driveway for a leak to show? IS the torque convertor supposed to leak down?
Member, GMCI, Sunshine Statesman and Dixielanders
26' 1978 Eleganza II, new(rebuilt by Sirum) 403, Lenzi hubs and knuckles, front end by Ferrara
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Re: Transmission ?? [message #327433 is a reply to message #327384] |
Sat, 23 December 2017 09:04 |
jhbridges
Messages: 8412 Registered: May 2011 Location: Braselton ga
Karma: -74
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Senior Member |
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yes, and yes. What you need to do is after the coach sits long enough to show a spot, >then< wipe the transmission clean and see where it's oozing. Pan, dipstick, modulator and lines are the possibilities, with the first two being the most common. Since it's lower, the pan leaks, if any, will appear before the fluid rises enough to get to the dipstick tube or modulator opening. The problem is to get the pan dry and then inspect daily while the coach is level. Do this with an inspection mirror with a long holder, >do not< crawl under an unsupported coach. If you lose a suspension component while you're under an unblocked coach, you will probably die.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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Re: Transmission ?? [message #327442 is a reply to message #327411] |
Sat, 23 December 2017 19:33 |
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Matt Colie
Messages: 8547 Registered: March 2007 Location: S.E. Michigan
Karma: 7
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Fipp wrote on Fri, 22 December 2017 09:12I too have speedometer issues but decided not to do much. My transmission leak mystified me also but found weep hole in the final drive leaking and the great Bob Dunohugh suggested leak in the seal between the transmission and final drive. Hello Bob, I think I finally got on this site, and tried to call you this morning. Merry Xmas everyone!
Fipp,
Welcome to the group/family/cult/asylum...
Glad you found your way here.
Before you and we go too far, please build a sigfile. The regulars here have them and it is not coincidence. You can do this at <Control Panel/Account Settings> and scroll down. Please put in a real name. We use those here so that when other owners from here meet you (and you will meet) they may have some idea who you are. You should include an short about the coach because there are differences and some matter a whole lot. And lastly, but not leastly is a sort of location. The half of this group that gets this as e-mail will never see the "Aledo, Illinois" in the header. This matters because other that may choose to lend assistance need to know if you are in striking range, and there are environmental issues that can be more easily cleared.
If you need assistance with the coach, you have come to the right place. But that is just the beginning. I do not know how long you have had the coach, but you will soon discover that connecting to this group makes you a part of a community that is helping and supportive to a level that astonishes many. This just one of the reasons that owners are so friendly. When you read here, you will hear of levels of assistance that most think are outlandish, but we have come to love. This solid community so reminds me of that of the watermen that are my world that I have taken to welcoming new people here much any new owner or vessel is welcomed there. So,
May the Good Lord bless this coach and all those that set forth within her.
Welcome "Fipp"
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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