A manual transmissions like the NV4500 hold a mere 8.5 pints. In 4th gear, the transmission stays cool, but in 5th gear (overdrive) it can quickly heat up. There is just not enough gear oil capacity. It didn't matter what oil I used, it wasn't enough. So I did the math and compared it to the gear oil capacity of semi-tractor trailers in retrospect to their gross cargo weight and compared it to my pickup trucks gear oil capacity and its gross cargo weight. What I calculated was, my pickup should hold at least 7-8 quarts, not 8.5 pints. Two more quarts would make a huge difference, and it did! The best way to add 2 quarts is to extend the pto covers with aluminum (for cooling) to add gear oil capacity. I quickly found out that with Fast Coolers on my NV4500, I could keep the temperatures under 200 degrees versus the previous 230 degrees. And one side does for all. Fast Coolers would have fit a 4 speed from 1932 and they will fit our brand new truck today. The SAE 6 bolt PTO access cover has been the same bolt pattern for over 80 years in all trucks. Dodge, Ford and GM all utilize the same SAE 6 bolt PTO access cover. They will fit, and they're cool!

They fit all 6 bolt SAE PTO covers. These 6 bolt covers started in 1932 and have the same bolt pattern today. They are standard on all Dodge, Ford, GM and any other medium to heavy duty trucks. They are mostly recommended for manual transmissions as they have no way of circulating the oil. If you're still not sure if it will work for you, just check if your manual transmission has one or two 6 bolt PTO covers. If it has 2 PTO covers, (one on each side) you can order the #2fc300. If you only have one PTO cover, you can order the #1fc300. The Coolers are 3 inches in length so you can also check for clearances. If you have 5 inch exhaust you might have a problem. But if you have 4 inch exhaust, your in great shape. Fast Coolers really do fit all of the six bolt SAE PTO covers since 1932.

At FastCoolers, we're here to provide the clarity you need. If you have any questions, from product specifics to installation guidance, feel free to reach out to us using the form below. We've streamlined the process to ensure a swift response to your inquiries. Alternatively, you can give us a call or text at 605-310-3070 or shoot us an email at fastcoolers@gmail.com. We are ready to tackle your questions and help you find the perfect cooling solution for your needs.