tranny experts need help
#11
formerly 1BADC10 (12/14/2011)
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If that problem occured AFTER you had it rebuilt, I'd look to see if the spring is missing or just bound against an opening in the valve body. Make sure that valve can slide in and out by momentarily pressing on the valve then releasing (with solenoid A removed, of course). Oh yeah... in order to do that, you'll have to drop the pan (as if you didn't know that by now, huh?).
#12
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Assuming no one has disabled the DTC reporting for transmission components, disconnected plug would throw quite a few codes. I've had that happen TWICE.
*edit*
And they'd have figured that when they checked the tune.... ASSUMING they didn't disable any trans codes.
*edit*
And they'd have figured that when they checked the tune.... ASSUMING they didn't disable any trans codes.
#13
FormerVendor
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If I read this thread correctly this problem has been with two different transmissions. With that being said in order to have 1st gear and 4th there is an issue with the A solenoid working properly. I do not feel because there have been two transmissions and computers that the problem is with the trans or the ecm. I would suspect that the harness plug has a pin that has been pulled out not making a proper connection. I would look closely at the plug and also look the wiring from the computer to the transmission. Also if any code tests have been disabled turn them all back on for diagnosis purposes. Vince
#14
PT's Slowest Truck
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If I read this thread correctly this problem has been with two different transmissions. With that being said in order to have 1st gear and 4th there is an issue with the A solenoid working properly. I do not feel because there have been two transmissions and computers that the problem is with the trans or the ecm. I would suspect that the harness plug has a pin that has been pulled out not making a proper connection. I would look closely at the plug and also look the wiring from the computer to the transmission. Also if any code tests have been disabled turn them all back on for diagnosis purposes. Vince
#15
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If I read this thread correctly this problem has been with two different transmissions. With that being said in order to have 1st gear and 4th there is an issue with the A solenoid working properly. I do not feel because there have been two transmissions and computers that the problem is with the trans or the ecm. I would suspect that the harness plug has a pin that has been pulled out not making a proper connection. I would look closely at the plug and also look the wiring from the computer to the transmission. Also if any code tests have been disabled turn them all back on for diagnosis purposes. Vince
im posting this for a friend(customer) of mine we cant figure out what it is
tranny started slipping wouldn't shift to 2nd gear I would have to let off the gas so tried changing shift solenoids...it didn't work so dropped tranny... got it rebuilt by aj's.. replaced everything bolted it up and tested it out.. tranny didn't work in ''D'' it starts in 2nd gear and has no over drive?? so we took it apart again and rechecked everything nothing was wrong...but replaced servo and solenoids but still nothing...next tried neutral saftey switch and nothing still did the same..so took it to llavero to check the tune said everthing was okay so we tried and different pcm and tried several tunes and nothing now I have eliminated all these componets what else could be i'm breaking my head and can't figure it out! anybody ever experience anything like this?? it driving me crazy...anybody got any idea?? any input is welcome. thanks
tranny started slipping wouldn't shift to 2nd gear I would have to let off the gas so tried changing shift solenoids...it didn't work so dropped tranny... got it rebuilt by aj's.. replaced everything bolted it up and tested it out.. tranny didn't work in ''D'' it starts in 2nd gear and has no over drive?? so we took it apart again and rechecked everything nothing was wrong...but replaced servo and solenoids but still nothing...next tried neutral saftey switch and nothing still did the same..so took it to llavero to check the tune said everthing was okay so we tried and different pcm and tried several tunes and nothing now I have eliminated all these componets what else could be i'm breaking my head and can't figure it out! anybody ever experience anything like this?? it driving me crazy...anybody got any idea?? any input is welcome. thanks
Now... big question is... are ANY DTCs disabled? Only gold can answer. If NOT, then I wouldn't be willing to bet 100% it's a wiring issue. If codes are disabled, then (like you said) re-enable, and see what pops up. Question I have now... after reading first post again... is during the SECOND rebuild attempt, did you check the movement of the shift valve under solenoid A? One would think a problematic solenoid or open loop would set a DTC.
#18
TECH Fanatic
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Take everything you've been told (history) and toss it out, focus on symptoms here and now. If the one trans doesn't roll in first unless it's in manual first and has no overdrive it has to be related to the Solenoid "A" circuit as Vince pointed out. There are no single mechanical failures that would produce that exact pair of problems that I know of.
The reason it moves in manual first, but not "O" or "D" first is because the forward clutch pack is not getting apply fluid for first gear. The low/reverse clutch pack activates in manual first and is enough to move forward - but there's no torque holding ability to it so don't gas it in manual first or you'll smoke it and won't be able to back up anymore! In second and third the Solenoid "B" circuit is feeding the forward clutch apply circuit but re-applying the band for fourth gear requires the Solenoid "A" circuit which isn't working.
The reason it moves in manual first, but not "O" or "D" first is because the forward clutch pack is not getting apply fluid for first gear. The low/reverse clutch pack activates in manual first and is enough to move forward - but there's no torque holding ability to it so don't gas it in manual first or you'll smoke it and won't be able to back up anymore! In second and third the Solenoid "B" circuit is feeding the forward clutch apply circuit but re-applying the band for fourth gear requires the Solenoid "A" circuit which isn't working.
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