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1967 Pontiac Temptest Transmission Tunnel Enlarging

The next step was fabricating a new trans crossmember for the 4L60E (made out of 1.5-inch diameter, .120-inch thick DOM steel tubing). The two critical measurements here are the longitudinal offset of the trans mount (the difference between the location of the original trans mount and the new 4L60E mount), and the vertical placement (to arrive at the mechanically correct driveline angle). Remember, the angle between the tailshaft and driveshaft must be complementary (180 degrees apart) to the driveshaft/pinion angle. Jeff used a tubing bender to get the crossmember shape just right, but a home builder could section some square or round DOM tubing for the same result.
Transmission Tunnel Enlargement - Tunnel Of Love

The next step was fabricating a new trans crossmember for the 4L60E (made out of 1.5-inch diameter, .120-inch thick DOM steel tubing). The two critical measurements here are the longitudinal offset of the trans mount (the difference between the location of the original trans mount and the new 4L60E mount), and the vertical placement (to arrive at the mechanically correct driveline angle). Remember, the angle between the tailshaft and driveshaft must be complementary (180 degrees apart) to the driveshaft/pinion angle. Jeff used a tubing bender to get the crossmember shape just right, but a home builder could section some square or round DOM tubing for the same result.  View Related Article

 

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