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Old 02-24-2012, 03:44 PM   #1
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auto tranny won't shift when hot

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.
Also, what fluid does it take?

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Old 02-25-2012, 07:48 AM   #2
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Anyone?

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Old 02-26-2012, 08:00 AM   #3
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Someone?
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Old 02-26-2012, 08:44 AM   #4
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Hey dude change ur filter and fluid and replace two of those bottles of tranny fluid with lucus tranny repair fluid 2quarts.
Works almost every time if that doesn't fix your problem change your shift solinoid
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Old 02-26-2012, 01:46 PM   #5
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does it have tranny cooling lines?
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Old 02-27-2012, 05:53 AM   #6
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Quote:
Originally Posted by fiveohhfox View Post
does it have tranny cooling lines?

Yes it does
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Old 02-27-2012, 06:10 AM   #7
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To much fluid can blow out your seals be careful. Also you could put on an aftermarket cooler for the tranny. But a fluid and filter change should fix it.
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Old 02-27-2012, 03:06 PM   #8
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Originally Posted by Gate53 View Post
To much fluid can blow out your seals be careful. Also you could put on an aftermarket cooler for the tranny. But a fluid and filter change should fix it.

Gonna try the cheapest way first. Fluid and filter.
Could probably use it regardless.
Hope it works.
Thanks to all
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Old 05-13-2012, 09:02 AM   #9
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hey milman, did the filter and fluid change work?

im having exact same problem thats why i ask.

let me know if it worked, thanks.
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Old 05-13-2012, 01:16 PM   #10
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So far it has been working just right.
Changed the filter & tranny fluid with lucus tranny repair fluid 2quarts.
The filter was really dirty. I only take it off road.
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Old 06-27-2012, 05:44 PM   #11
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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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Old 06-27-2012, 06:54 PM   #12
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Originally Posted by T'sTJ View Post
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.
I think Lucas tranny repair is different than additive.
I would use 2 quarts cause of the miles & new filter.
Trans cooler would be a good move, again cause of the miles.
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Old 06-27-2012, 07:06 PM   #13
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Thanks. I'll give it a go.

Are the 2 qts of Lucas in place of 2 qts of trans fluid?

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