you can have your TC lock up schedule changed with a chip.
also, I have a question about this exact topic(mostly for Alan)
I have a new 98 tranny(slightly used). it has a JMOD, and some other goodies.
I also installed a 1300 mile old Mach 1 TC.
I completely flushed all the lines, and cooler. COMPLETELY!
mercon V, Hayden 26k cooler, Mach 1 TC, and new TCC solenoid, with this tranny.
here's my deal:
my old 94 tranny had the exact problem since I owned it, and after JMOD/Mercon V/cooler added in.
the TC locks way too early. it shifts through 1-2-3 just fine, but as early as 30 mph, the TC locks up, drawing the RPMS way down. It feels exactly like driving a manual tranny at 30 mph, and you slip it into 4th gear. The motor bogs, unless you kick it down into second, or tap the brake pedal slightly to unlock the TC.
I am considering having my ECU reflashed, or buying a chip with a custom lock-up schedule. My 97 had this exact problem severely, so our chip now locks the TC at 42 mph, instead of the FACTORY-SET 34 mph.
anayone have thoughts on this? it happens with a cold, or warm tranny...almost 90% of the time. if you drive it like a hot-rod(more throttle around town) you never see it. But if you are in traffic, or on a 30mph steet, it drops the rpms in 3rd(O/D off) down to 1100, which barely moves the car.
This ISNT the notorious shudder. But it does suck! I was looking more forward to having that problem go away with my new tranny, than I was having it be a "better" tranny than my 94. I'm bummed.