And if you've got the big bucks for a gear vendors, here's two more options.
Richmond truck 6 speed ($3000+)
1 1/8 shaft with 10 splines
4.01 1st gear
.73 Overdrive 6th gear
mid mount shifter
Fits where an SM465 went 68 and up if you shorten the driveshaft. You can replace the SM420 with a little machine work on the bellhousing.
Ranger torque splitte from Advance Adapters for $1500. 2 models to fit in front of any chevy trans about $1500. .73 overdrive Moves the shifter back 7 inches. I like these, others on this forum have complained of problems.
Neither of these work with a TT rear.
