As above my car shuters when it hit lockup at 45-50 in 4th,rpms are around 1800-2000. If you try to slowly gane speed in 4th locked up it shakes, but if your going 55+ it does nothing?

 

I hate to be the bearer of bad news, but TCI is not a very reputable company for lock-up converters. A shudder usually means the clutch, in the converter, is coming apart.

Frank
CPT

 

well it only has 500miles on it and has done it from the get go, It doesnt do it when it hits lock up, its once its locked up it shakes, at low rpms, like its bogging the motor?

 

my car did something similar, it ""bucked"" and that was caused by a not perfect tune and bogging the motor...with 3.73 it did it around 38-40 locked up slightly on the throttle...
is yours shuttering or bucking?

 

yes it bucking, what did you do to fix it?

 

bump