Need to know the check ball location above and below the separator plate for a transgo improved shift separator plate #46-PLT-96
SOURCE: Transmission shifts harsh after driving it 10-15 miles
alright, since the computer sees the transmission slipping, it maximizes pressure to try and compensate. with the 1870 code it is referring to the lockup clutch in the converter. I have seen colleagues remove the TCC (torque converter clutch) valve from the valve body and insert a stiffer spring to remedy the situation, but i have only seen it work effectively once. It almost always resulted in more problems and headaches wither immediately, or a week down the road.
i know its not what you want to hear, but a rebuild will probably be your best bet. hope this helps.
SOURCE: i just rebuilt my 4l60e and reinstalled and now i
Note that many problems that show up as transmission issues are
actually PCM or electrical, and may be external to the transmission.
Try a different PCM, and check for chafing where the cables come out of
the PCM.
The transmission is on the same fuse as the MAF, O2 sensors and at
least one other sensor - if an O2 shorts out, it will blow the fuse and
the trans will go into limp-home mode. Be sure the trans has power and
the fuse is not blown before doing anything else.
Limp mode is a fault mode in which the transmission either loses electrical power
or the PCM deactivates all of the electronics. The transmission will
default to max line pressure. The driver will have Reverse and 3rd,
with manual 2nd available by putting the gearshift in 2 or 1 (doesn't
matter). 1st, 4th, and TCC lockup will not be available. It will not
hurt the car to drive it like this for short periods, but use manual
2nd to get the car moving, and be aware that the trans will generate
more heat than normal while operating in limp-home mode due to
increased torque converter slippage during 2nd gear starts and no
lockup in 3rd gear.
Check the wire harness clip on the transmission, passenger side by the catalytic converter. Look for any damages due to corrosion or brake in the wire leads. it's common for the clip to brake and the wire harness to loosen causing the transmission in to limp mode. Good luck and keep me posted, be glad to help you get your transmission running again soon and please rate.
Check for check ball wear on the separator plate and address it if
needed. The 1-2 check ball wears out and sometimes the check ball blows
through or sticks in the plate causing troubles.
Just thought I would point out a few items to think about. Good luck.
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