For the 1975-1981 frames, the distance between the crossmember frame mounting holes is 31-3/4″. To ensure proper crossmember selection be sure to measure your frame before you order.
We recommend a polyurethane transmission mount. The GMTM is sold separately.
In some cases, an RCF2L-700 installed with a T5 transmission may require a custom transmission mount to maintain proper drive line angle.