I had the transgo put in B1, it did make notice positive improvements to the shift patterns and gear holding in my old V6. Make sure you get all the old valves out of the valve bdy before installing the transshift springs and valves, Its been a lond time fault, some have made when doing the instal, causing major transmission faults and error codes, shutting down the transmissions of many.
Get it right and Its all good.
cmohr
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