A/T - External Oil Cooler Kits

File In Section: 7 - Transmission

Bulletin No.: 36-71-03A

Date: June, 1998

INFORMATION

Subject:
Automatic Transmission (AT) External Oil Coolers

Models:
1988-98 Chevrolet and GMC C/K Models

This bulletin is being revised to add the 1994-1998 model years and add two new cooler part numbers for 1996-1998 4L60-E equipped models. Please discard Corporate Bulletin Number 36-71-03 (Section 7 - Transmission).

GMC/Chevrolet Truck has available to owners a high efficiency automatic transmission oil cooler. This cooler is also available as RPO KNP for many models in the C/K line. This new air to oil cooler offers excellent cooling ability.

Because the high efficiency offered by this cooler exceeds many aftermarket coolers, we are offering this cooler in kit form for dealer installation. This cooler may be installed on both new and used vehicles that are in applications which create higher transmission operating temperatures. These applications typically include high frontal areas (either on the truck or trailer), or heavy loads where vehicles are operated at higher road speeds.

The transmission oil coolers listed have been thoroughly tested and will provide the extra transmission oil cooling that trucks used in these applications may need. These kits can be installed in approximately 1.2 hours and include the following components:

- Cooler - Mounting Brackets

- Clamps - Flexible Lines

- Fasteners - Installation Instructions

Important:
The installation of any auxiliary transmission oil cooler which is located ahead of the A/C condenser and radiator will reduce air flow through these components. A slight increase in engine operating temperatures, more frequent fan clutch engagement and a small decrease in A/C performance should be considered normal.

Vehicles equipped with an external cooler and operated in cold climates should use DEXRON(R) III in their transmission. This fluid offers improved low temperature viscosity and high temperature oxidation stability.





Parts Information

Parts are currently available from GMSPO.