I replaced the OEM transmission cooler with this unit on my '99 Sierra 1500 (GMT800). Many people choose to go with a Tru-Cool 40k unit, but since I rarely tow, I went with the Tru-Cool 28k. The 28k (24,000 BTU) is easily twice the size of the OEM tranny cooler, and consistently keeps transmission temps ~20* lower than before. I am using Torque Pro to monitor temperatures.
Transmission Fluid Temp Test (60* ambient):
OEM Cooler: 150*
Tru-Cool 28k: 130*
If you have a factory GM transmission cooler, the fluid path goes from Transmission > Radiator > Trans Cooler > Transmission. Some people elect to bypass the radiator for more cooling, but I did not. Transmission fluid is heated as it passes through the radiator, essentially removing the need for an external thermal bypass. We have a few brisk days of cold weather here in Colorado, and I didn't want to have to worry about over-cooling the transmission fluid. I wanted something that would keep the transmission cool, but not too cool. This is another reason I didn't chose the 40k cooler. If I lived in an area that rarely saw freezing weather -OR- if I had a vehicle that is known to internally fail, thus causing transmission fluid and coolant to mix... I would bypass the radiator.
Install was very easy on my Sierra. The original transmission cooler lines are 3/8", and I had no issue with the 11/32" on this cooler (that's a whopping 1/32" difference - don't stress over it). The kit comes with everything you need; however, I wasn't aware of all the fittings in the kit before ordering, so I used the Hayden 397 fitting (I honestly may not have needed this fitting, but wanted to be sure I had no snags during installation). The included transmission hose was also of sufficient length. As minor as it may be, I also much preferred the black color of the 28k over the 40k.
| Manufacturer | Dana Corporation, Long Manufacturing |
|---|---|
| Brand | Meikobuly |
| Item Weight | 1.76 ounces |
| Package Dimensions | 13.62 x 11.42 x 2.83 inches |
| Item model number | 4590 |
| Is Discontinued By Manufacturer | No |
| Manufacturer Part Number | LNG-4590 |
