4L60E - What's Next to Go?

gpking

Well-Known Member
I've got 130k miles on the clock and my trans has been a minor PITA since 84k with little gremlins appearing here and there. I'm at my wits end trying to connect the dots. What should I replace next?

Things I have replaced:
- Spacer plate
- Accumulator pistons (pinless)
- TCC valve (fixed TCC flutter)
- Manifold Pressure Switch (it set a code and would get stuck in like 2nd gear or limp mode)
- Fluid with Dexron IV (40k miles on fluid)

Ongoing Symptoms:
- Hard 1-2 shift under normal acceleration (can chirp tires on slick pavement)
- Normal firm 1-2 shift at WOT (I don't do this much though)
- Hard P-D shift (sometines it will do this so violently there is an audible bang)
- Launching in "2" seems to start in 2 or just slips horribly until it shifts to 3.
- Manual 1 and 3 behave normally.
-All downshifting is completely normal.
- All 2-3, 3-4 and TCC lockups (PWM is disabled) feel normal and consistent

More details to come. It acted very out of character today (sloppy and sluggish). I will drive with the scanner hooked up tomorrow.
 

littleblazer

Gold Supporter
Could it be a pump problem?
 

MRRSM

Lifetime VIP Supporter

gmcman

Well-Known Member
Just curious, when you reinstalled the separator plate, did you get the one checkball back in the valve body before you installed the plate? This ball needs to be secured with a dab of vaseline.
 

Chickenhawk

Well-Known Member
Launching in 2 when placed in 2 is normal. It is how to get going smoothly if the roads are very icy, so you can cross that symptom off your list.
 

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