I need to know the cleanest most efficient way to swap a TH350 for the 700R4. More specifically, will the stock cross member suffice to secure the turbo and are the splines the same for the yoke?

 

A long tail shaft TH350 (9") is the easiest to swap since the driveshaft will fit without any modifications. The output splines are the same. The mounting pad on the TH350 is 2" forward from the 700R4. Weld some sort of extension to the existing crossmember. You'll need to find some way to remount the torque arm. I've heard there's adaptor kits available but I don't know how they work. I bought a Steve Spohn arm and it bolts to his own crossmember.

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Stephen's racing page

87 IROC-Z Pro ET Bracket Race Car and knocking on the SuperPro ET class
383 stroker (carbed) with double hump cast iron heads and pump gas
LS6 Big Block buildup now in progress

Best results before the engine blew up
Best ET on a time slip: 11.857
Best corrected ET: 11.163
Best MPH on a time slip: 117.87
Best corrected MPH: 126.10
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!

Member of the Calgary Drag Racing Association