I have a 1978 F150 Ranger XLT with a C6 transmission, and I have been advised NOT to add the shift kit for pulling a trailer. The reason was the kit might cause problems because of the age of the truck. What do you think?
Thanks

 

It doesn't matter how old your transmission is to utilize the improved shifts that a shift kit can add. At any age or mileage, the quicker shifts lower heat and increase friction material life. Towing only multiplies the benefits. The C-6 responds very well to shift kits and there are heavily tested shift kits available for it. If your transmission is on it's last leg, it won't matter if it has a shift kit or not.