Compatibility of Derale Transmission Cooler On GM's THM-400 Turbo 400 Transmission

Updated 11/25/2016 | Published 11/23/2016

Question:

I have a 1966 C20 pickup with the original turbo 400 transmission .will part #D14201 fit my truck ? Will it have a hole for the drain plug and one for a transmission temp sending unit ? Thanks for your help .

asked by: James P

Helpful Expert Reply:

The Derale Transmission Cooler # D14201 is designed to fit GM's THM-400 (Turbo 400) transmission. The pan is equipped with a drain plug and a port on the side to where the temperature sensor is mounted.

However, I have conflicting information on when this transmission was first installed in the C/K series trucks. I have attached a picture of the # D14201 for you to compare with the oil pan on your transmission to make sure this is the correct pan.

This pan will be a little deeper and will have 1 quart and 17 ounces of extra fluid capacity. I have also included a picture that shows the new pans dimensions. Keep in mind, this pan is deeper than the factory pan at 2-7/8 inches. You will want to keep this in mind, especially if your truck is lowered or if you frequently travel off-road.

expert reply by: Jared P