t56 upgrade?
my guess is either the syncros are going out (mileage) or you bent/cracked something from shifting it wrong.....
you can get the steel 3/4 shift fork from D&D (thats out of the Viper) but other than that, its just rebuild with the stock stuff as the only "better parts" the Viper has that we don't is a larger input and output shaft (which would require a larger clutch and output yoke). The T56 is stong as long as you shift it right.


