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700R4 woes, just a leak

Kocher93

Kocher93

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Basically a year ago I got a monster 700R4 and its been awesome. When I first got it, it had a minor leak at the pan and was no biggie. Now fast forward a year things leaking like me after taco bell. So after I resealed my 241 (thanks norcal chris for the right stuff tip that ****s awesome) I figured I'll finally reseal my tranny. Well the right stuff leaked, and again and again (I'm at try 4). So I finally just got a new gasket and decided to get a new filter. I got a cork gasket but my wix filter came with a thick rubber gasket, which one should I use?
 
I always use the rubber ones. Cork is very easy to over tighten and cause leaks
 
Check the seal surfaces and make sure the pan isn't warped too bad. Getting silicone or even Right Stuff to seal will be hard because you have to be 100% oil free and the slush box will drip for days. A good rubber gasket should be all you need. The can be re-used dozens of times.

Make sure it isn't a leak higher up running down, too.
 
any time you seal at or under the level of oil the surfaces need to be dry n free of oil .

also check the dipstick tube to case seal . those can look like a pan leak.

i dont use cork on tranny pans if i can help it. rubber gasket and all dry on the install.
 
I have a new pan with a drain plug. I really wanted a cast aluminum pan, but I didn't want the aluminum pan price. So rubber gasket and throw some rtv on each side?
 
I've pulled my 700 and 4L60 pans dozens of times and put them back with no prep. I've replaced probably 1 gasket in the last dozen years. Look at how many bolts there are. If it's not sealing with a regular rubber gasket something is wrong. Have you checked out the whole seal surface? Maybe just grab a junkyard pan. Have you degreased the whole tranny to make sure it's not coming from higher up (cooler lines, shift shaft, servo cover, vent line, etc) or maybe from the adapter?

Are you sure the vent is open?
 
Typically you will not use a sealant on a auto pan. If you do I would suggest gluing the gasket to the pan and not the transmission.

It's really easy to over tighten the bolts and cause a leak. They don't need to be tight just a good snug up.
 
Just got done with it didn't tighten it too much. Didn't have any ATF on hand so I used some left over Allison synthetic fluid, so my truck can haul like 40,000 lbs now. This bitch is sealed and I'm going wheelin on Sunday. Now I need to check over all my stuff and spares and such. It's been a whole year and a half since I've gone, I'm excited.
 
I treat pretty much all seal surfaces as flawed somewhere,mostly because Murphy really hates me, and put a thin layer of Ultra Black on both sides of the gasket. It's a real mother to clean off but I'd rather break out the cordless and wire wheel when I drop the pan than watch my tranny puddle all over someones driveway one fine morning.
 
Just a thought, but most tranny pans dont have a drain plug because your not supposed to drain them. The filter is supposed to be changed every time and checked for shavings and such. Most autos filters are cloth, and will clog with a quickness if any water (number 1 reason of fluid changes) or shavings get in it.

When shut off, a slush box's fluid level is ABOVE the gasket, when running it is not. If you were to take the pan off, the tranny will basically siphon itself completely dry. With the pan off, it only drains until the pan reaches a certain level, then it stops. Like gravity bleeding kind of, but with no pan (or a leak), that level can never be attained and it just keeps leaking. I have good luck with cork, just not to tight. But rubber is 100% better in the long run.
 
Good point but I'm tired of the fluid bath every time I drop the pan. Tranny filters are cheap enough to change every time you have to get into it. Put a clean rag over the container inlet when draining to find any debris.
 
Yea the rubber gasket is holding, just found out my 241 is leaking at the shifter I'm not sure on how to fix it without taking it apart so I'll just clocking it so its out of sight and out of mind :rolleyes:.
 
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