Th200 Transmission For Sale
Th200
Th200 Transmission For Sale
Th200 Transmission Identification

TH-200-4R transmissions are very easy to locate from salvage yards, and most replacement parts are still available from transmission parts suppliers and auto parts stores. Heavy-duty parts for racing applications are available from transmission parts suppliers, as well.
424 A C TURBO HYDRAMATIC 200, 200C (M-29) 3 SPEED RWD W & W/O Lock Up Revision 01/2017.
This transmission was an hydraulically controlled 3 speed. Bottom cooler line is the cooler return line. Band adjustments: Intermediate = not adjustable Reverse = not used. Gear Ratios: 2.74:1 1st gear 1.57:1 2nd gear 1.00:1 3rd gear 2.07:1 reverse: Transmission (click on picture to enlarge) Pan gasket.

Transmission Model Number TH200 Applications, Specifications, Dimensions, Ratios. Newest April 18, 2021 This 1964 Buick Riviera is a Stealth Custom Rides & Roadkillers April 15, 2021 Daily Driver Engine Duel Chevy 350 vs. Dodge 360 Technical Info.

200 THM

Used 1976-80. The 1981-87 version was called 200C and had an electronically controlled lock-up torque converter. There were MANY versions and were used in various GM models as well as some Jaguars and Isuzus.

It had an aluminum case. Pan shape was similar to 350 THM, but was embossed 'METRIC'. It had no modulator and there was no removable extension housing. With the exception of the manual lever seal and the rear seal and bushing NONE of the parts for this transmission are interchangeable with the 350 THM.

This transmission was an hydraulically controlled 3 speed.

Bottom cooler line is the cooler return line.

Band adjustments:
Intermediate = not adjustable
Reverse = not used

Gear Ratios:
2.74:1 1st gear
1.57:1 2nd gear
1.00:1 3rd gear
2.07:1 reverse

Transmission

(click on picture to enlarge)

Pan gasket

(click on picture to enlarge)

Copyright© 2003, 2004, 2005, 2006, 2011, 2012 Charlie Tranny

Turbo-Hydramatic
Overview
Manufacturer	General Motors
Production	1964–2012
Body and chassis
Class	3-speed longitudinalautomatic transmission
Related	Turbo-Hydramatic 125 Turbo-Hydramatic 180 Turbo-Hydramatic 425
Chronology
Predecessor	Dynaflow Hydra-Matic Powerglide Jetaway Super Turbine 300
Successor	4L60-E/4L65-E 4L80-E/4L85-E

Turbo-Hydramatic or Turbo Hydra-Matic is the registered tradename for a family of automatic transmissions developed and produced by General Motors. These transmissions mate a three-element turbinetorque converter to a Simpsonplanetary geartrain, providing three forward speeds plus reverse.

The Turbo-Hydramatic or Turbo Hydra-Matic (THM) series was developed to replace both the original Hydra-Matic models and the BuickDynaflow. In its original incarnation as the Turbo-Hydramatic 400, it was first used in the 1964 model year in Cadillacs. The Buick version, which followed shortly thereafter, was known as the Super-Turbine 400. By 1973, THM units had replaced all of GM's other automatic transmissions including Chevrolet's Powerglide, Buick's Super Turbine 300, and Oldsmobile's Jetaway. Starting in the early 1980s, the Turbo-Hydramatic was gradually supplanted by four-speed automatics, some of which continue to use the 'Hydramatic' trade name.

Although the Turbo Hydra-Matic name alludes to the original Hydra-Matic developed by General Motors' Cadillac division in the late 1930s, the two transmissions were not mechanically related.

Super Turbine 400 / THM400 / THM375 / 3L80 / 3L80HD[edit]

Turbo-Hydramatic 400 Transmission

The THM400 can be visually identified by an oil pan number four shown at General Motors Transmission Pans. First introduced for the 1964 model year under the name 'Turbo Hydra-Matic' in Cadillacs and 'Super Turbine' in Buicks. The following year, application expanded to Oldsmobile and Pontiac and to some full-sized Chevrolets. Many of the Buick, Cadillac, and Oldsmobile THM400s produced between 1964 and 1967 were equipped with a 'Switch-Pitch' torque converter with a variable-pitch stator, which is sought after by collectors and drag racers. These can be identified outside the vehicle (with the torque converter removed) by a narrow front pump spline. Externally the switch pitch version has two electrical connections, where the non-switch pitch THM400 has only one. GM used a Switch Pitch torque converter in the Buick twin turbine Dynaflow transmission between 1955–1963 and the Super Turbine 300 two speed transmissions used by Oldsmobile, Pontiac (Pontiac's ST300 didn't have a switch pitch), and Buick divisions between 1964 and 1967. This transmission (among other THMs) is identified by the 'Park R N D L2 L1' selector quadrant. The switch pitch is not the only THM400 that utilizes an external 2 prong connector. Other units to include the 2 prong connectors had an internal pressure switch that was used to control spark timing retard. All THM400 units had a 32 spline output shaft with the exception of the THM375 that used a 27 spline output.

A Hydra-Matic 3L80 transmission, produced between 1963 and 1995, at the Ypsilanti Automotive Heritage Museum

A variant of the THM400 known as a THM375 is a THM400 with a mid length 27 spline output shaft that mates to the smaller THM350 27 spline drive shaft yoke. It can be identified by '375-THM' cast into the tailhousing. Internally the clutch packs originally had fewer friction plates. THM375s were found in some 1971-76 Buick Lesabres and Oldsmobile Delta 88s with the 5.7 liter V-8. Somewhere in the Mid-80's Chevrolet C10 Pickups could also come equipped with a THM375. It is a THM400 Chevrolet bolt pattern case that has a longer 27 spline output shaft and matching extension housing with 'TH375' cast into the housing. Some 'Heavy Duty' THM350s were also designated THM375-B. Another variant is the 3L80HD, often referred to as a Turbo 475. The 3L80HD has a straight-cut planetary gear set. There is no externally visible way to determine whether the transmission contains the straight-cut planetary gear set. The THM425 front wheel drive transmission shares almost all its internal parts with the THM400. Checker Motors Corporation Motor Company used the Chevrolet version of the THM400 for its 'A' series taxi and Marathon models until the end of production in 1982.

By 1980, the relatively heavy THM400 was being phased out of usage in passenger cars in response to demand for improved fuel economy. The THM 400 was utilized in the C- and K-series (full-size) Chevrolet/GMC pickups and G-series (full-size) vans until 1990 when GM switched over to the 4L80E. Today, the United States ArmyHMMWV is the only vehicle using the THM400. The civilian Hummer H1 originally had the 3L80s, but the current model has had a 4L80E since the mid-1990s.

Through the end of the '70s substantially more CBOP (Cadillac/Buick/Oldsmobile/Pontiac) bellhousing THM400s were produced than any other THM400. Chevrolet bellhousing THM400s, while not rare, can be hard to find and are, as a result, usually

Th200 Transmission