1993 grand cherokee 42re problems
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1993 grand cherokee 42re problems
I am looking for anywhere on the internet to find a used or refurbished transmission control module. Or if any one has one they are willing to part with that would be great and I will pay all cost. My part number is 56027218 and its for the 42re trans. Also if there is anywhere i might be able to send the tcm to get it rebuilt that info would be great as well. To answer any questions that might arise about my trans problem i have already replaced the tps and the speed sensor and changed the fluid and filter and adjusted the bands as well. It shifts erratically sometimes, not all the time and shifts at high rpms from 2 to 3 or if i let off the gas it shifts like normal before the rpms get to high. If anyone has any insight to any other possible sensors that could be replaced or any other fixes on anything to solve this pain in my *** problem, any help will be aprpreciated. thanks.
#2
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Welcome to the forum.
This ATSG 42RE Manual is well-written and complete. It is superior to the FSM and is a nice complement to that document.
This ATSG 42RE Manual is well-written and complete. It is superior to the FSM and is a nice complement to that document.
#3
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I am looking for anywhere on the internet to find a used or refurbished transmission control module. Or if any one has one they are willing to part with that would be great and I will pay all cost. My part number is 56027218 and its for the 42re trans. Also if there is anywhere i might be able to send the tcm to get it rebuilt that info would be great as well. To answer any questions that might arise about my trans problem i have already replaced the tps and the speed sensor and changed the fluid and filter and adjusted the bands as well. It shifts erratically sometimes, not all the time and shifts at high rpms from 2 to 3 or if i let off the gas it shifts like normal before the rpms get to high. If anyone has any insight to any other possible sensors that could be replaced or any other fixes on anything to solve this pain in my *** problem, any help will be aprpreciated. thanks.
#5
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Is your fluid low? Filter plugged up? There is a very specific way you check the fluid on these, in N, warmed up, and shift thru the gears first. Also only ATF +4 on these. But for sure you need to give the gov pressure sensor some attention as I say above. You can search many videos on this procedure.
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Changed all solenoids out and works better but the the Haynes book I have said to use Dex mercon for the 1993 what is the difference and would it hurt it at all
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#8
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IMO, toss the Haynes book, get the correct Factory Service Manual and don't look back.
Again, the ATSG 42RE Manual is well-written and complete. It is superior to the FSM and is a nice complement to that document.
Again, the ATSG 42RE Manual is well-written and complete. It is superior to the FSM and is a nice complement to that document.
#9
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The correct fluid is ATF+4, as defined in TSB 21-010-06.
Adjust the bands, fluid and filter changes, and drive it. BTW it's one pressure sensor, and two solenoids.
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Alright thanks. I'll have to get that manual. Driving it was dex Merc in it for a little bit won't hurt it though. Right. Or should I just swap it out tomorrow
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#12
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Per the linked TSB:
NOTE: ATF+4® must always be used in vehicles that were originally filled with ATF+4®. DO NOT USE ANY OTHER FLUID.
NOTE: ATF+4® is backward compatible with ATF+3 , ATF+2, and ATF+. Additionally, ATF+4 can be used to top off vehicles that used ATF+3, ATF+2, or ATF+.
The Dexron / Mercon is not supposed to be inside the transmission. Even after dropping the pan and after blowing out the external coolers, there is over a quart of fluid lingering within the torque converter, the passages and the cavities.
The appropriate remedy is to drain and blow out the lines. More fluid would be freed if removing the valve body.
Yes, I would suggest a drain / fill cycle, followed by another in the near future.
NOTE: ATF+4® must always be used in vehicles that were originally filled with ATF+4®. DO NOT USE ANY OTHER FLUID.
NOTE: ATF+4® is backward compatible with ATF+3 , ATF+2, and ATF+. Additionally, ATF+4 can be used to top off vehicles that used ATF+3, ATF+2, or ATF+.
The Dexron / Mercon is not supposed to be inside the transmission. Even after dropping the pan and after blowing out the external coolers, there is over a quart of fluid lingering within the torque converter, the passages and the cavities.
The appropriate remedy is to drain and blow out the lines. More fluid would be freed if removing the valve body.
Yes, I would suggest a drain / fill cycle, followed by another in the near future.
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Per the linked TSB:
NOTE: ATF+4® must always be used in vehicles that were originally filled with ATF+4®. DO NOT USE ANY OTHER FLUID.
NOTE: ATF+4® is backward compatible with ATF+3 , ATF+2, and ATF+. Additionally, ATF+4 can be used to top off vehicles that used ATF+3, ATF+2, or ATF+.
The Dexron / Mercon is not supposed to be inside the transmission. Even after dropping the pan and after blowing out the external coolers, there is over a quart of fluid lingering within the torque converter, the passages and the cavities.
The appropriate remedy is to drain and blow out the lines. More fluid would be freed if removing the valve body.
Yes, I would suggest a drain / fill cycle, followed by another in the near future.
NOTE: ATF+4® must always be used in vehicles that were originally filled with ATF+4®. DO NOT USE ANY OTHER FLUID.
NOTE: ATF+4® is backward compatible with ATF+3 , ATF+2, and ATF+. Additionally, ATF+4 can be used to top off vehicles that used ATF+3, ATF+2, or ATF+.
The Dexron / Mercon is not supposed to be inside the transmission. Even after dropping the pan and after blowing out the external coolers, there is over a quart of fluid lingering within the torque converter, the passages and the cavities.
The appropriate remedy is to drain and blow out the lines. More fluid would be freed if removing the valve body.
Yes, I would suggest a drain / fill cycle, followed by another in the near future.
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So now this happened. Drove ten miles down the road had to get to work and now it won't stay I gear at all and manually shifting it does nothing. It started off fine and then all of sudden nothing. Any suggestions on where to start looking for a cause of this problem. Just replaced solenoid and pressure sensors as stated above. Engine still runs and and stays running even when out of gear.
#15
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IMO, toss the Haynes book, get the correct Factory Service Manual and don't look back.
Again, the ATSG 42RE Manual is well-written and complete. It is superior to the FSM and is a nice complement to that document.
Again, the ATSG 42RE Manual is well-written and complete. It is superior to the FSM and is a nice complement to that document.
So now this happened. Drove ten miles down the road had to get to work and now it won't stay I gear at all and manually shifting it does nothing. It started off fine and then all of sudden nothing. Any suggestions on where to start looking for a cause of this problem. Just replaced solenoid and pressure sensors as stated above. Engine still runs and and stays running even when out of gear.
So now there is a no drive condition, in all forward and reverse gears.
If this repair will be performed by the OP, then there are diagnostic steps defined in the listed manuals. I would recommending getting both.
There are four pages of tests defined while the transmission is installed. Those include pressure measurements on the test ports, using two different high-pressure gauges with different ranges and long flexible hoses.
Armed with that information a rebuild / repair is implemented. Here is my 46RH Rebuild Topic. Clearly it is lots of work, many specialized tools are required, but following the instructions results in a properly working transmission.
Or, bring it to the shop for repair...