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1999 Dodge Durango - transmission Side View - Photo 31038270

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  • 4. NADP transmissions sit behind some of the most powerful diesels on the planet, so the pros there understand how important it is to build a transmission that can not only take power, but deliver it consistently. Billet internals, an upgraded valve body, and performance clutches are just a few of the high-performance improvements that make our 48RE Heavy Hauler transmission capable of withstanding demanding off-road conditions.
4. NADP transmissions sit behind some of the most powerful diesels on the planet, so the pros there understand how important it is to build a transmission that can not only take power, but deliver it consistently. Billet internals, an upgraded valve body, and performance clutches are just a few of the high-performance improvements that make our 48RE Heavy Hauler transmission capable of withstanding demanding off-road conditions.
131 0912 02 z+1999 dodge durango+logo 131 0912 01 z+1999 dodge durango+48re automatic transmission 1. For the 48RE to communicate and shift properly behind the V-10 we needed an early version of the transmission to utilize the mechanically controlled kick-down cable. While a later-model electronically controlled unit may have worked, we are suckers for keeping things simple. On the engine side we simply swapped out the coupe throttle body for the SRT-10 truck unit since it is equipped with the appropriate cable guides and attachment points. 2. A block spacer and SRT-10 flexplate are required to mate the 48RE to the 8.3L engine. Since these two parts are not common junkyard finds we sourced ours from the Viper performance and parts Mecca that is Arrow Racing Engines. 3. Without question one of the trickest parts of our transmission is the custom torque converter from NADP. With the company's Heavy Hauler Triple Disc setup, NADP was able to design us a converter that provides incredible lock friction and fluid coupling. This equates to a converter that is strong, reliable, and ready to withstand all the power our Viper engine can throw at it. 4. NADP transmissions sit behind some of the most powerful diesels on the planet, so the pros there understand how important it is to build a transmission that can not only take power, but deliver it consistently. Billet internals, an upgraded valve body, and performance clutches are just a few of the high-performance improvements that make our 48RE Heavy Hauler transmission capable of withstanding demanding off-road conditions. 5. Before bolting the transmission in place we filled the converter with synthetic ATF from Mobil 1. While transmission fluid requirements differ amongst makes and models, synthetic is usually a safe bet because it is designed to keep fluid temperatures lower. This is important, as excessive heat is deadly to an automatic transmission. 6. To support the beefy 48RE we used a Mountain Off-Road Enterprises 13/4 bushing kit and had Momentum Performance build us a set of custom crossmember mounts to weld to the frame. TIG-welding each laser-cut mount, we opted to hard mount the transmission for increased ground clearance. 7. In order for our new crossmember and drivetrain to fit, we needed to delete some of the factory cross bracing. Using a Hobart Air Force 400 plasma cutter, we burnt through the old metal with one pass of the torch.
8. Using 13/4x0.120 wall DOM tubing, Momentum's Bobby Downes fabricated a set of custom crossmemebers to support both our transmission and transfer case. While the overall size of the 48RE wasn't much larger than the factory transmission, with the drivetrain now pushed back close to a foot, we got creative with our tubing bends to allow enough room to clear the front driveshaft and exhaust. 9. Though the bulk of the transmission install is complete, we will revisit the final assembly in a later issue. This will allow us time to plumb our transmission cooler lines out of the way and spend time wiring the J-Tec controller that will make the transmission and engine work in harmony. 10. With the headers and transmission in place, we tackled the foot control pedals. With the new dog box firewall taking up a fair amount of room, we to had to transfer both the brake and gas pedal back and over close to 4 inches. Luckily, I have a very gravity-enriched physique so the pedal move didn't really affect my driving comfort. 131 0912 12 z+1999 dodge durango+drivetrain
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