We now have this tail housing new that work with both speedometer gears and speed sensor at the same time.
700R4 Tail Housing with Transmission Mount
700R4 tail housing with transmission mount (7 3/8 inches long). This will move the mount to the rear 5 1/2 inches. This moves the rear transmission mount to the same position as a TH400 (short-style) or 200-4R transmission. This extension housing can eliminate transmission crossmember modifications when replacing a TH 400 or 200-4R transmission with a 700R4 assembly. These are almost impossible to find. I’ve seen these at the GM Dealer for $210.00 years ago. COST USED WHEN IN STOCK $150.00.00, CALL 1-888-2012066.