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Unread 12-04-2012, 01:35 PM   #1
Crewdude007
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2001 XJ Cherokee 
 
Join Date: Jun 2008
Location: Bel Air, MD, MD
Posts: 489
Freshly rebuilt trans shifting erratically. Normal?

Background: Just had my 42re rebuilt at 217K. Originally took it into the shop because it was hesitating shifting 1-2 and overdrive was on its way out. First drive into work today and after about 25 miles on the highway, it started displaying the same symptoms. It didnt' want to shift out of first gear coming from of a dead stop until I let off the gas and it didn't want to downshift into overdrive on the highway. After I stopped for gas, the problem didnt' come back for the last 3 miles of my trip. I called the trans shop and they said this is not unexpected for the first startup after a rebuild.

Questions: Is this normal behavior after a rebuild until the trans "relearns" the shift points? Should I call shenanigans on the trans shop and take it back there immediately? I still need to drive it about 50 miles to get home today.

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Unread 12-04-2012, 01:43 PM   #2
katzonice69
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See how it is on the way home. The torque converter probably just had no fluid in it from the rebuild so it shifted irratically until it got fluid in it
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Unread 12-05-2012, 09:21 AM   #3
Crewdude007
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2001 XJ Cherokee 
 
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Update: I had the same problem on the way home last night and the truck is back at the shop. After the trans warmed up, it didn't want to shift out of first if coming from a full stop. In addition, it shifted erratically for the first minute or so after this problem manifested before it straightened itself out. If I even touched the gas during this time, the engine would rev really high no matter how little gas I gave it. I'll update again when I have some solid info from the shop.
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Unread 12-05-2012, 09:37 AM   #4
chriswj
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dont let them give you any bullsh!t
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Unread 12-05-2012, 10:38 AM   #5
KayCeeJeep
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And a lot of independent tranny shops want to use "universal" fluids and then dump additives in them to make them Chrysler compatible. NO! Make sure they are filling it with real ATF+4.

With the level of problems you are having it's probably more than just that but something to watch for. My son's Chrysler tranny was rebuilt by an independent shop just prior to his buying it, and it had occassional shift issues early on but a couple of drain and fills of real ATF+4 took care of it.
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Unread 12-05-2012, 10:58 AM   #6
Crewdude007
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It's not an independent shop. I took it to Aamco. The office manager swears they use genuine ATF+4.
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Unread 12-13-2012, 11:24 AM   #7
Crewdude007
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Latest update: After supposedly ruling out wiring and electrical problems the first time and performing a costly rebuild, they are once again checking for wiring and electrical problems. Tomorrow will make 3 solid weeks they've had my truck. They've repeatedly stated that they're not charging me for this, but from my perspective, the inconvenience of not having my DD back is costly enough. Are they just taking me for a ride at this point?
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Unread 12-14-2012, 01:34 PM   #8
Crewdude007
What, me worry?
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Today's update: so I went down there today. The truck is still on the rack and they were draining the trains fluid when I visited. Still haven't figured out the problem, but it's good to see they're still working on it and haven't forgotten about me. They've been very light on details of what they've tried so far, so unfortunately I don't have any wisdom to impart. What they have told me, though, is that the next step is to just replace the transmission. I guess they're getting tired of this merry-go-round too. Nits under warranty, so I'm not expecting it to cost me any more than what I've paid so far. We'll see.
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Unread 12-15-2012, 01:55 AM   #9
Hazed_blue
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Through all of this, has anyone checked the transmission speed sensors to see if they're faulty or gooped up?
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Unread 12-17-2012, 10:17 AM   #10
Crewdude007
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I would hope that they've ruled out the low-hanging fruit like TPS, speed sensors or shift solenoids, but who knows? They've been very light on details.
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