I recently bought a b&m shift improver kit without knowing that it might mess up my tranny.Is this true?? Is the Transgo better because I've read in the forum that it is. Also should i go synthetic for the tranny? It has 80k granny driven miles on it. How much of a difference will i be expecting to feel from this improver?And is it necessary to shift manually or leave it in gear to feel it?

Now about the gears...I went from 225/50/15 tires(stock) to 255/60/15s in the rear...are 3:73s to much, or should i stick with 3:42s? wat year rear end will bolt up to my '89 rs with drums in back.

 

The B&M kit will make your transmission shift hard. The TransGo kit will make your transmission better.

 

Thanks for your help
anymore input?