I'm installing an R11 behind a T-10 in my '41. Both for gear splitting and for the OD it would provide. The R11 is much stronger with 4 planetary gears instead of the 3 on the R10. I killed R10's on regular basis before behind Saganaw 4 speeds and have grown a little shy of useing them again. I can see why you would want one. Hard to find! Good luck!
