Steve40th

1993 Corvette, 396LT1 A4 2800 rpm converter , 42# injectors, 3.75 gears, long tubes, heated O2 sensors. Runs great, with the exception of cruising at about 1800 rpm , plus or minus 200rpm, in OD.. It seems to buck a little, like a little surging, causing the driveline to slap, like hearing u joints are broke.
U Joints are new, driveline is solid with D44, Ikerds diff, and I cant move any of the half shafts or driveshaft by hand when in the air.
If I drop a gear, to 3rd it all goes away, even when I get in same rpm. Maybe not as pronounced due to speed, but I cant hear it
So, in tuning, what parameters can assist a barely above idle/throttle to keep car from bucking/surging a little.
TCC speeds for lock up and unlock. Right now its as follows.
TCC is lock 47mph low
42mph Unlock low gears
TCC lock high gears 56mph
TCC unlock high gears 42
TCC unlock prevention speed threshold is 64

Steve40th

Its been a long time since posting, but after seeing another thread, it made me curious if my tcc settings are off due to surging (shudder?) at light throttle. It happens around 40 -55 mph while in town if I am in OD.
https://www.thirdgen.org/forums/tran...ru-needed.html In Post 11 the tables were changed significantly from mine. Different years, but pretty much same transmission.