93 3.8 trans overdrive

[bakes0917]

transmission shutters badly when shifting into overdrive (40-45 mph) it will stop shuttering breifly when depressing the accelerator firmly but shutters badly if holding steady. One mechanic told me that the engine was skipping and that the plugs wires and coil packs were in good shape but to try replacing the ignition module to stop the engine skipping. I've seen other posts about transmissions problems so I'm hoping someone can help figure this one out

[maxwedge]

A trans tech with the proper scanner can command tcc operation and check slippage ,it could be a bad tcc which is a similar feel to an engine miss.

[MT-2500]

Welcome on your first post on AF.
First does it do it only when first going into OD or lockup or out of lockup and or over drive? Or does it do it all of the time in OD or on a pull or hill?
If it does it all of the time or on a pull check for engine miss. Plugs and wires and check the coil output for good hot blue spark and the wires for good hot blue spark to all plugs.
What kind of spark plugs are in it?
Also sometimes the have a PCM prom update to help on things like that.
Covered in TSB 376517A 8/4/94
If it just does going into or out of TCC or OD. LubeGard makes a good additive that helps on trans shudder.
MT

[LMP]

AS several others on this forum did, just unplug the TCC plug
www.avigex.ca/xport/tccloc.jpg
and drive itlike that for a while and see what happens. (this will light up the Check Engine Light).
If shudder continues, then investigate ignition related causes.
If all is quiet and steady then (with TCC plug out) , this will clear the coil and spark plug issue out. THen you will have to consider "TCC shudder" .
www.avigex.ca/xport/tccshudder.jpg as a possibility; this is most probable cause since pressing the throttle as you say releases the TCC, and TCC comes back on at steady throttle. CLearing this at the source may be a co$tly option you will have to balance again$t the value of the car and the time you plan to keep it. TCC can be shudder free at light loads, but higher loads can make it slip and shudder if it lacks sufficient pressure or if it is worn out.

YOu have the option of disconnecting only the A or D wire from the transaxle connector and insert the plug back in so the A and B solenoids will continue normal operation ; only the TCC will be removed.
www.avigex.ca/xport/transaxle.jpg
www.avigex.ca/xport/transaxleconnector.jpg
THis will provide full 4 speed computer controlled operation but no TCC, a very interesting and low $ solution if TCC proves to be the culprit. Only penalty, at highway speed, it will burn slightly more fuel and rev about 400 more rpm because of fluid converter slip. FOr city driving, you will not see a difference.
Using a small screwdriver or the like, A or D wire can be pulled out of the TCC plug without destroying anything.