Jim--
Using 85w-90 GL5 should be fine, or use GL4 if it's available, it might
cost less. 140 would probably be ok in the rearend unless it's real
cold out. The old fashioned GL1 is probably what was used
originally...so it should be ok too, and the price is right!
Transmission Stop Leak usually has a substance in it which will make
rubber swell (brake fluid will do this too, for less money). Except
that the original seals are leather! so it probably won't do any good.
Changing the rear cover gasket on the rearend should not be too
difficult, but pulling the pumpkin on a closed driveline truck is a
pain, so I can understand putting it off for awhile. You might want to
keep a drip pan under the truck when it's parked at home...no sense
letting oil get all over the ground if you can prevent it.
Jim F
59s in AZ
> Date: Fri, 1 Jun 2001 08:03:46 -0400
> From: "Jim House" <jhouse@ccsol.com>
> Subject: [oletrucks] Transmission Leak Fixer
>
> I have a 46 1/2 ton and have to squeeze in the pumpkin about 1/2 bottle per
> month of Transmission Oil to keep it full. I can not find 90 grade oil like
> the manual states is needed. I am using 85W-90 with a GL5 on the label. Is
> this ok to use? They also have 90W-140 but I was scared away by the 140. I
> have also found that I can purchase 35 lbs of 90W GL1 at WalMart for around
> $20.00 - is this what I am looking for?
>
> It is now dripping out the bottom a lot more since I have scraped off all of
> the old grime and dirt. I have looked at a few products like Stop Leak for
> transmissions. It states to help bring back the seals. Is this worth a
> try?
>
> I can not figure out if it is leaking from the rear or front seal on the
> pumpkin. I am guessing that I could change the rear seal in an afternoon,
> however changing the front seal could be more than I could do on mine own.
> Has anyone completed this task - any hints?
>
> Thanks,
> NJJim
> 46 Chevy 3104
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