Hi im new to this forum and im in need of major help. Ready to get my car back on the road! I have (5 pontiac firebird formula with the LT1 in it. im attempting to swap out the 4L60 that is in it now to a short tail TH350. i know i need to replace the output shaft but dont know what length i need and also i need a spacer to go inbetween the transmission and the tail housing. im trying to swap the tail housings so i can use the bracket to bolt up to the arm that goes to my rear end. several forums ive read say this is the set up i need but ive been looking for hours for the adapter and output shaft length i need and cant find it. any help would be much appreciated!!