HELP Auto Tranny Experts!!!!

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Jul 28, 2001 | 08:39 PM

Gearhead Jo in CO

Thread Starter

Heel & Toe

Joined: Mar 2001

Posts: 22

Likes: 0

From: Breckenridge, CO, USA

Started out with simple fluid and filter change,Now 3 gaskets later, still leaking in front of pan. Its a 92 700R4, I tourqued to 96 inch Lbs. Could Stock Pan be bent out of shape after being put on and off so many times?? Should I get new pan and try again? It usually went at least a hundred miles before it starts leaking. Any advice would be appreciated.

Jul 29, 2001 | 05:36 AM

drive it

Melting Slicks

Joined: Apr 2001

Posts: 2,117

Likes: 221

From: Ca.

Quote:

Originally Posted by Gearhead Jo in CO:
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Try goopin that sucker with rtv silicone sealer! [img]http]//www.corvetteforum.cc/ubb/smile.gif[/img] It sure works on intake manifolds!

Jul 29, 2001 | 06:27 AM

88L98

Drifting

Joined: Nov 2000

Posts: 1,722

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From: Big D Tx

Cruise-In II Veteran

id do like he said and use a little bit of silicone, but dont go ape sh*t with the stuff, you dont want excess inside your tranny.

Jul 29, 2001 | 09:41 AM

89 Bob L

Burning Brakes

Joined: Dec 2000

Posts: 1,161

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From: Orangeburg, NY

Try removing the pan and placing it on a flat surface, (I used my wife's counter in the kitchen, if she only knew) to see if it is bent in any specific area. Use 2x4's approx 8" in length to straighen it out. Dry the pan as best as you can as well as the tranny, where the gasket goes.
Clean all of the bolts. Put the gasket and pan on, hand tighen the bolts in hte listed sequence. Start out tightening each corner just a little then proceed clockwise one bolt per corner as indicated below. Tighten the bolts 10-12 inch pounds each pass until you reach the 90-96 in lbs.

1 5 9 13 2

16 6

12 10

8 14

4 15 11 7 3

I have seen many posts which do not recommend any type of sealant on tranny gaskets. Gaskets usually leak due to either a bent pan, over tightening, or loose bolts. When you readjust/re-tighten the bolts. Do the same sequence again, not just re-tighening the loose bolts.

Jul 29, 2001 | 01:41 PM

moffitt

Burning Brakes

Joined: May 2000

Posts: 1,181

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From: Puyallup Washington

Try staying away from the cork gaskets that many filter kits supply. I had the best luck with the gaskets that appear to be some kind of heavy paper with a black coating. I do still use a little of the good orange or red RTV on both sides.

Jul 29, 2001 | 01:51 PM

toejam

Advanced

Joined: May 2001

Posts: 61

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From: Royal Oak, MI

Just to add my two cents here . . . gasket goop, sealants, RTV (room temperature vulcanizate) are all silicone based. Silicone based gaskets, whether they are RTV or HCR (heat cured rubber - like valve cover gaskets) aren't used in transmissions because ATF de-polymerizes silicone. In short, the stuff reverts, breaks down into its original chemical compounds, starts to leak, etc. The stuff works good for the short term (1/12, or 2/24'ish) but if you don't want to re-do this procedure I would suggest using one of the "premium" gaskets available.

If you can find someone at the shop that knows his stuff ask him for a gasket made of Vamac, or AEM (Ethylene Acrylic Monomer). Vamac is a DuPont tradename and is currently the only material approved by GM for side/bottom pan sealing applications. Although polyacrylate, or PA, or ACM (Acrylate monomer) is probably just as good.

Sorry this is so long, I guess when I start teaching my sealing classes I will have to interject some jokes just to keep the class awake

Jul 29, 2001 | 02:01 PM

jeffie86/96

Instructor

Joined: Jul 2001

Posts: 198

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Don't overlook the holes that the bolts go through, sometimes they get "humped up" for lack of a better term, and won't allow the sealing pressure to be transmitted over the proper area. Good luck.

Jul 29, 2001 | 08:41 PM

Gearhead Jo in CO

Thread Starter

Heel & Toe

Joined: Mar 2001

Posts: 22

Likes: 0

From: Breckenridge, CO, USA

Thanks fellers for all the imput, will try again this week after work and will take it one step at a time.. All the advice is Greatly Appreciated!! Gearhead JO____