PPE 124060300 Performance Parts & Miscellaneous Accessory

Really like that it did reduce transmission temperature

This cooler fits perfect no modifications needed, came with hose retainer clips amd fittings so just connect and bolt on. Lowered my trans temps 30 degrees consistently. I would recommend this to anyone with a 2003 LB7 Duramax with Allison 1000. Will work with stock transmission lines or aftermarket, my lines were good so didn't change them. 5/8" lines the newer models are 7/8 i believe and not explained that clearly so here it is. Put a wrench around ypur line in front and its either one or the other Cardinal Classics NE-AR

The stock one looked like it belonged on a prius, this is a great upgrade for a lifted duramax truck running oversized tires, after install you need to add about half a quart of atf to refill the new cooler, the temperature was 92 degrees and i never got over 170 and i would usually be around 200 with 35s and a 6 inch lift. engine runs about 5 degrees hotter which isnt a bad thing for a diesel, helps with a more complete combustion. Took about an hour to install well worth the money if you have a LLY Duramax

Looks great, wasn’t really thrilled I had to use 3 1/4” bolts and 4 extra washers... I mean it’s not a big deal.. but for almost 500$... 9/10

Installed this in my 2005 GMC 2500hd duramax and last spring. I really wish I had done it in 2005 when I bought the truck. Transmission runs way cooler and I highly recommend this to anyone with this truck.