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The 45RFE was introduced in the Jeep Grand Cherokee in 1999, it is notable for including three planetary gearsets rather than the two normally used in a 4-speed automatic. It also features three multiple disc input clutches, three multiple disc holding clutches, and a dual internal filter system (one primary filter for transmission sump, one for the fluid cooler return system).
It is Jeep's first six-speed manual transmission and Chrysler's second after the Dodge Viper T-56. The NSG370 does not use standard gear oil for lubrication. This transmission utilizes bronze synchronizer collars resulting in sensitivity to lubricant make-up.
The Dana 20 is generally compatible with the "big hole" Dana 18. One exception is the version used with the THM400 in full-size Jeep trucks, which used a different spline number on the input gear. Applications: Jeep CJ; Jeep SJ; 1963-1979 Willys-Overland Jeepster; 1979 International Scout with 727TF AT uses the 23 spline 26 tooth gear.
AMC 20s have an 8 7/8" ring gear and use a 29 spline axle shaft. The AMC 20 was most often used with V8 engines in cars and Jeeps . It was also used in the AM General Humvee .
The AX15 built by Aisin was used in Jeeps with the AMC 242 (4.0L) Inline 6 engine, as well as the AMC 258 (4.2L) Inline 6 engine and AMC (2.5L) Straight 4 engine.This included vehicles such as the Cherokee(XJ), Comanche (MJ), and Wrangler (YJ and TJ) and 1994-1995 Jeep Grand Cherokee ZJ as well as the 1st and 2nd generations of the Dodge Dakota.
Neutral mode is intended for towing the vehicle. In 4-Lo, the front and rear axles are locked together through a 2.72 reduction gear ratio. The NV247 transfer case is mated to front and rear axles containing Jeep's Vari-Lok differentials. Vari-Lok differentials also use a gerotor to transfer torque between the wheels on either side of the axle.
The gearbox was designed so that, for efficiency, the fastest ratio would be a "direct-drive" or "straight-through" 1:1 ratio, avoiding frictional losses in the gears. Achieving an overdriven ratio for cruising thus required a gearbox ratio even higher than this, i.e. the gearbox output shaft rotating faster than the engine.
Crawl ratio is a term used in the automotive world to describe the highest gear ratio that a vehicle is capable of. Note that gear ratio, also known as speed ratio, of a gear train is defined as the ratio of the angular velocity of the input gear to the angular velocity of the output gear, and thus a higher gear ratio implies a larger speed reduction, i.e. the input speed is reduced more at ...