Home » Public Forums » GMCnet » TH425 Filter Change (Noted Differences In TH425 Transmission Filters)
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Re: TH425 Filter Change [message #353278 is a reply to message #353273] |
Sun, 29 March 2020 16:15 |
kingd
Messages: 592 Registered: June 2004
Karma: 2
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Senior Member |
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Jim, there have been several discussions on here about that very problem. It sounds like some
Brands of filter are being made with a too small tube. DO NOT use one that is too small.The tranny
Will suck air and 'blow' up.( not lierally) but it WILL wreck the transmission.
Measure the tube on your old transmiission filter with a dgital caliper and shop oround until you find a brand that fits
If your local Canadian Tire has one in stock, ask f you can measure it. If CTC dn'thave one, try
The local auto parts stores.
Has anyone one in Canada found a brand in Canada that fits properly?
DAVE KING
lurker, wannabe
Toronto, Ontario, Canada
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Re: [GMCnet] TH425 Filter Change [message #353304 is a reply to message #353286] |
Mon, 30 March 2020 05:47 |
Rich Kinas
Messages: 113 Registered: July 2019
Karma: 1
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Senior Member |
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Jim,
I'm a bit confused at this point. To recap, your new filter and old filter
have exactly the same mounting tube diameter, but the new filter is 1/8
inch shorter. a couple of questions for you:
1) if you install the old filter, but leave it out the 1/8 inch, do you get
the same play as the new filter?
2) You stated that you did not what to force the new filter? I'm missing
something here, since if it is floppy....
3) Did you check the new filter for for roundness?
Rich
On Sun, Mar 29, 2020 at 8:26 PM Jim via Gmclist
wrote:
> I did read back through some posts concerning the subject, even before I
> started the operation. I was getting the impression it was the diameter of
> the mounting stem and not the length that was causing issues, perhaps I
> misunderstood.
>
> Diameter on both filter stems is exactly the same.
>
> I had a fellow GMCer that is ready to do the same maintenance on his coach
> check out the specs on his filter, his being a Wix and this is a Power
> Torque with part number FK-117. His Wix specs came back identical to this
> unit.
>
> This unit was acquired in the USA and not here in The Great White North...
>
> It's a mystery...
> --
> Jim Owens,
>
> 78 Royale,
>
> Out skirts of Kitchener, Ontario
>
> _______________________________________________
> GMCnet mailing list
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>
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Rich Kinas
1976 Elaganza II
Orlando, FL
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Re: [GMCnet] TH425 Filter Change [message #353322 is a reply to message #353320] |
Mon, 30 March 2020 10:42 |
James Hupy
Messages: 6806 Registered: May 2010
Karma: -62
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Senior Member |
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You ABSOLUTELY, POSITIVELY, do not want the transmission replacement filter
to be even a tiny bit loose in the valve body bore. If it sucks air, you
will soon have an expensive transmission to repair. Been there, done that.
Serious no-no. The oil pan should not be the thing that holds that filter
in place. Friction fit in the bore is. Two "0" rings? If it makes you feel
better, O.K.
Jim Hupy
Salem, Oregon
On Mon, Mar 30, 2020, 8:27 AM Carl Stouffer via Gmclist <
gmclist@list.gmcnet.org> wrote:
> I just did mine a month ago and the ATP filter I got was the right size.
> I used two O-rings on it and did not have any problems. The outlet that
> goes up into the transmission body needs to measure 3/4" in diameter
> --
> 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:
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Re: [GMCnet] TH425 Filter Change [message #353325 is a reply to message #353322] |
Mon, 30 March 2020 10:45 |
jimk
Messages: 6734 Registered: July 2006 Location: Belmont, CA
Karma: 9
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Senior Member |
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On Mon, Mar 30, 2020 at 8:38 AM James Hupy via Gmclist <
gmclist@list.gmcnet.org> wrote:
> You ABSOLUTELY, POSITIVELY, do not want the transmission replacement filter
> to be even a tiny bit loose in the valve body bore. If it sucks air, you
> will soon have an expensive transmission to repair. Been there, done that.
> Serious no-no. The oil pan should not be the thing that holds that filter
> in place. Friction fit in the bore is. Two "0" rings? If it makes you feel
> better, O.K.
> Jim Hupy
> Salem, Oregon
>
> On Mon, Mar 30, 2020, 8:27 AM Carl Stouffer via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> I just did mine a month ago and the ATP filter I got was the right size.
>> I used two O-rings on it and did not have any problems. The outlet that
>> goes up into the transmission body needs to measure 3/4" in diameter
>> --
>> 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
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.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: [GMCnet] TH425 Filter Change [message #353326 is a reply to message #353322] |
Mon, 30 March 2020 10:45 |
jimk
Messages: 6734 Registered: July 2006 Location: Belmont, CA
Karma: 9
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Senior Member |
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All I know is that the filters come from one source, so brand does not
matter.
Suggest you mark how far the original went up and make sure the new does
the same.
On Mon, Mar 30, 2020 at 8:38 AM James Hupy via Gmclist <
gmclist@list.gmcnet.org> wrote:
> You ABSOLUTELY, POSITIVELY, do not want the transmission replacement filter
> to be even a tiny bit loose in the valve body bore. If it sucks air, you
> will soon have an expensive transmission to repair. Been there, done that.
> Serious no-no. The oil pan should not be the thing that holds that filter
> in place. Friction fit in the bore is. Two "0" rings? If it makes you feel
> better, O.K.
> Jim Hupy
> Salem, Oregon
>
> On Mon, Mar 30, 2020, 8:27 AM Carl Stouffer via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> I just did mine a month ago and the ATP filter I got was the right size.
>> I used two O-rings on it and did not have any problems. The outlet that
>> goes up into the transmission body needs to measure 3/4" in diameter
>> --
>> 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
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.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: TH425 Filter Change [message #353348 is a reply to message #353273] |
Mon, 30 March 2020 17:55 |
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JBO
Messages: 65 Registered: August 2012 Location: South Western Ontario
Karma: 0
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Member |
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Thanks to everyone that responded. The new filter is in place nice and secure.
I raised the coach a bit higher so I could have a better understanding of the situation.
Both filters have the exact same diameter throughout the length that inserts into the the trans.
I had to square the new one exactly and tap it in with a mallet. I tapped it on the reinforced edge. Once I had it started it pushed right up in with taps of mallet. It's not going anywhere.
I misunderstood how far the filter went into the slot...
Jim Owens,
78 Royale,
Out skirts of Kitchener, Ontario
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