post #1 of Old 08-09-2012, 07:05 AM Thread Starter
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1988 MJ Comanche 
Join Date: Jul 2009
Location: georgia
Posts: 63
What oil in ba5/10 transmisson?

What type oil do I need to run in a ba5/10 transmission that has around 100K miles?
I think that the original specification was for ATF, but I believe a thicker oil would work better in this transmission.
What do the experts suggest?

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post #2 of Old 08-09-2012, 07:42 AM
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1989 YJ Wrangler 
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Location: Plymouth
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Castrol 75-90 GL5 works pisser. I wouldnt switch to anything else at this stage in its life.

Last edited by crowespastureyj; 08-09-2012 at 07:56 AM.
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post #3 of Old 08-09-2012, 11:20 AM
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1986 MJ Comanche 
Join Date: Dec 2009
Location: Harvard, IL
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You need to use a GL-4 spec, if I remember right. GL-5 has too much sulfur in the additives, and sulfur and brass syncros do not get along. I think you can still get GL-4 from AMSOIL guys.


'86 MJ 2.1L 4x4 MT LWB - Factory Diesel
'87 MJ 4.0L 4x2 AT LWB - Metric Ton
'97 XJ 4.0L 4x4 AT Country
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post #4 of Old 08-09-2012, 11:08 PM
Pete M
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1988 MJ Comanche 
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Location: S/E Michigan
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Rob you're thinking of the AX-15. Far as I know, any 75/90 will work great in a Peugeot.

ATF is for autos and some t-cases.

-88 MJ; 4.0L, ex-2wd, TJ ax15/231, 78 Ford D44 w/spool, 9" w/posi, 33" trXus MTs, custom roll-bar/bumpers/etc.
Also an 86 MJ Metric ton and 2 '90 MJs
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