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auto tranny won't shift when hot

13K views 12 replies 6 participants last post by  T'sTJ 
#1 ·
87 YJ 4.2 w/ auto tranny
Recently purchased and shifted good until I took it off road.
Tranny will not shift when it warms up.
No problem moving the shifter column through the gears but will not do anything.
When I shut it down and let it cool down it works.
I tried to check fluid level but it was hard to tell on the dip stick.
I added fluid but does the same thing.:confused:
Also, what fluid does it take?
 
#11 ·
Same problem here as the OP, yet mine was serviced this past January. This is not a daily driver and I've only put 950 miles on it since then. Besides fluid the shop also added 1qt "Lucas Trans Additive". Is that the same as "Repair"?

I plan to flush and replace the filter myself. Will 2 qt's, of Lucas Repair, make a difference over just the one?

BTW, I have a new Hayden Trans Cooler still in the box collecting dust. Would it be a good idea to install it at the age of my Jeep (178k miles) or bad?

Thanks for any help.
 
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