05 TJ auto trans issue?

[Grand_Wag_85]

Friend of mine has an '05 TJ that's acting up and we can't figure out why. After the Jeep warms up the trans won't want to shift out of 2nd gear after getting warm and most of the time shutting it off will fix the problem but that doesn't always work.

Here's the specs:
05 TJ
4.0
Auto
180K
RHD

It's a postal Jeep so it sees upwards of 600 stops a day and LOTS of stop and go driving.

[Stuka]

When was the last time you changed the filter and fluid? With a 180k and that style of driving, you should be on your 4th or 5th change out.


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[Grand_Wag_85]

When was the last time you changed the filter and fluid? With a 180k and that style of driving, you should be on your 4th or 5th change out.

I'll have to ask him, the fluid is nice and clear. He's not the kind to slack on maintenance so I imagine it's been done a time or three.

[carnuck]

If it's the 3 speed auto, the valvebody solenoid is sticking. Shutting off and restarting gives a little voltage boost (from the alt kicking up to replenish the drain from the starter) which can make it work again for awhile. Repair is to swap out the valve body for a fresh one. If 4 speed auto, it depends on whether it's AW4 or 42RE (same issues as 3 speed 999 auto)

[Stuka]

If it's the 3 speed auto, the valvebody solenoid is sticking. Shutting off and restarting gives a little voltage boost (from the alt kicking up to replenish the drain from the starter) which can make it work again for awhile. Repair is to swap out the valve body for a fresh one. If 4 speed auto, it depends on whether it's AW4 or 42RE (same issues as 3 speed 999 auto)

'05 should be a 42RLE.

[carnuck]

Starter on the opposite side but same issues as the other 2

[GentleRF]

Something I learned a long time ago was: if you have an aluminum case MOPAR transmission, change the fluid and filter once a year or every 12,000, which ever comes first. The folks who followed that advice rarely (if ever) had problems with their transmissions, myself included.

[lindel]

This type stuff is why I have a standard in my TJ...of course, the drive to work this morning was a little rough. At -4, even synthetics aren't happy!

[carnuck]

Those trans have a rep at the dealerships as being fickle and trans shops LOVE when one comes in!