It uses the B-O-P bellhousing bolt pattern which makes it compatible with nearly any GM engine. This is because the TH400 was never designed to communicate with the CPU of the vehicle/The 3L80 was the last non overdrive transmission used by GM in regular production trucks and vans. Note that unlike all the other GM transmissions of the time there was no E at the end of the nomenclature. 3L80 stands for three gears, longitudinal mount (rear wheel drive), and the 80 signifies that it can handle 8000 lbs. There is no difference other than the name. In the early 90’s GM rebranded all of their transmissions, They created a standardized naming system across their product line, and changed the name of the TH400 to 3L80. It’s controlled by a vacuum module and kickdown switch
Outer Case Material: Aluminum, fused with bellhousing Production: 1964 (for 65 model years) through 1990ĭifferent applications had different lengths due to different tail shafts/transfer cases. Turbo 400 TH400 Specs Manufacturer: General Motors The TH400 has appeared in Jaguars, Hummers, Ferrari’s, and many more. More than almost any transmission ever made, it has found its way into a wide variety of vehicles outside of the GM family. The TH400 came in two wheel drive and four wheel drive vehicles, passenger cars and heavy duty trucks, as well as GM vehicles and those made by other manufacturers. It was introduced for the 1965 model year and made its debut in Cadillacs, and is respected for its durability and adaptability. It is common to adapt NP203's to transmissions that didn't originally have them for use in our 203/205 Doubler systems.īelow is a break down of the parts on a NP203:īelow are some measurements on the NP203, these measurements should be used for approximation only.The TH400 is an aluminum cased three speed automatic transmission that was produced by GM. The input gear on the NP203 used many different spline counts depending on application:ġ0 spline female: Rare option in '74-'75 GM trucks, behind SM465Ģ3 spline female: Found behind all transmissions for fullsize '75-'79 Dodge trucksĢ7 spline female: Common behind TH350’s in '73-'79 GM trucksģ1 spline female: Rare in Ford trucks in the '70’sģ2 spline female: Came in '77-'79 Chevy K20 and K30 trucks, behind TH400ĭivorced 32 spline male: Rare in Ford trucks in the '70’s, possibly early Dodge as wellĮach application used a unique adapter as well, there is a different adapter for each transmission.
In this configuration the 203 operates like more conventional transfer cases in that it's either in 2WD or 4WD and when in 4WD the power is evenly split from front to rear.
#Th350 exploded view install
Shift positions are: High, Lo, High Lock, Low Lock and Neutral.Ī popular modification to the 203 was to install a "part time" kit to eliminate the differential and slightly increase fuel economy. This was made possible through use of a differential in the back of the 203 that let the front and rear driveshafts turn at different speeds as just as a diff in an axle lets each axle shaft turn at a different speed.įor off road use, the 203 had a "lock" position in which the differential was locked making the front and rear outputs spin at the same speed (like a normal part time transfer case).
#Th350 exploded view full
The NP203 were originally a full time 4WD case, meaning all 4 tires receive power at all times.
#Th350 exploded view full size
The New Process 203 came in all full size '75-'79 Dodge trucks The New Process 203 was a rare option in '70's Ford trucks. The New Process 203 was a common option in '73-'79 GM trucks.
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