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I can expound.... but not tonight.
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OK, it's another day and I'm up for it.
First let me say that I have never found anything in print from AMC to even remotely suggest filling a T-4 or T-5 with any lubricant other than GL-5 (often confused since AMC had their own PN#).
Let's just start with the owner's manual. Here's page 151 and 152 from my 1985 CJ-7's owner's manual, yes I still have it.
You could get confused by the AMC part numbers, but SAE 75W-90 (API GL-5) looks to be very very clear.
Then there's the T4/5 Component Service Manual, I've got one of those too and scanned it today to share.
<u>B.V. T4/5 Component Service Manual, Manual Transmission T4/5</u>
Warning this is a 4.11MB PDF file (NOT DIAL UP FRIENDLY), but if you need to rebuild a T-4 or T-5 well worth the time. Please look at page 58 where 85W-90 API Grade GL-5 is a "newly approved second lubricant" for Jeep T4/5.
So if you were to do a Google search for T-5 you should come up with these pages:
<u>Not All T-5's are Created Equal</u>
<u>Borg-Warner T-5 Transmission Data</u>
<u>Identifying a T-5</u>
Anyone care to share their search results for T-5 lubrication on this BBS?? There are several threads in the past year or two....
It was around 85 degrees here in Indy today, well past warm enough to toast a Jeep T-5 running ATF in under an hour drive. [img]/ubbthreads/images/graemlins/crazy.gif[/img]