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Old 11-16-2010, 01:39 PM   #1
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1990 YJ Trans and slave questions

My stock 1990 YJ - 4.2l 6 cyl and 5 speed is leaking fluid and the clutch master cylinder runs dry. I cannot see any signs of leakage from the master or the lines. I suspect that the leak is coming out of the slave cylinder. Two questions:

1. How do I identify which transmission that I have - AX 4/5 or AX 15?
2. My manuals say that the transmission needs to be removed to replace the slave cylinder - is there a shortcut or do I need to fully remove and drop the transmission?

Thanks! Ben

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1990 Jeep YJ - 4.2 - manual
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Old 11-16-2010, 01:46 PM   #2
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First of all an AX4/5 was never behind a 6 cylinder....you either have a BA15 or an AX15. If your slave cylinder is external you can change it without pulling the tranny...if its an internal throwout bearing your gonna have to pull it

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Old 11-16-2010, 02:54 PM   #3
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Thanks - my info is that the BA transmission was only installed thru the 1989 model year and that the 1990 then has the AX. Anyone confirm this?
Thanks!
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Old 11-16-2010, 03:09 PM   #4
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I cannot confirm or deny that....I have seen BA's in 90, but someone could have changed them
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Old 11-17-2010, 11:23 AM   #5
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Ibuildembig I about posted exactly the advice you gave me in another thread - the ax-5 was never behind a 6. Love that and so easy to remember!
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