Chevy 350 Transmission

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  • Exclusive 3-speed Chevy Turbo 350 Street Rod crate transmission package from Speedway Motors. Each TH350 automatic transmission is dyno tested to ensure.
  • This Monster Powertrain Package is complete with all the features you need for a reliable Chevy 383 & Automatic Overdrive TH350 Transmission from a researched and developed combination of components. You'll have all of the reliability that you would want from a.

By far the most popular conversion is swapping out an original two-speed Powerglide (PG) for a three-speed TH350. The TH350 is a bolt-in replacement for a PG, making this swap a relatively.

Chevy Transmission Identification and Decoding

General Chevrolet Transmission Identification

Transmissions are marked and identified by:

- Casting numbers on the case, extention housing and side cover
(on manual trans).
- Date Casting Codes
- Assembly Date Code Stamping - can be stamped anywhere...
- Chassis Vin Number stamping - beginning in 1962

Transmissions have RPO numbers, usually beginning with 'M'.
This page covers automatic trannies. Go here for Chevy Manual Transmission Identification.

Chevrolet Automatic Transmission Identification & Description

Automatic transmission types are generally identified by their pan shape.


The THM200 and the THM250 have pans shaped like a THM350, HOWEVER, the THM200 will have the words HYDRAMATIC DIV. and METRIC stamped into the pan.

Chevy Automatic Transmission Description & Usage
THM200 - Light duty, 'metric' 3 speed transmission.

THM250 - Used in small 4 cylinder cars (Vega, Sunbird, Monza) from 1973 to 1981 and some Nova/Camaro/Chevelle 6 cylinders in 1974 & 75. The 4 cylinder models have 4 large cooling holes near the torque converter, while on the 'bigger cars' there are no cooling holes.

THM200-R4 - Used in GM rear wheel drive cars with the 3.8 V6, 305 & 350 Olds and 301 pontiac from 1981 to 1989. This is a 4 speed, overdrive unit.

THM350 - Medium duty 3 speed trans used from 1969 to 1989, Used in Buick, Olds, Pontiac and Chevrolet cars and Chevy & GMC light trucks until 1987. Generally used in straight and V6 and small block engines. Generally able to handle up to 400 foot pounds of torque.

THM375B - This trans is identical to the THM350, but is considered a heavier duty transmission.

THM375 - This transmission is a derivative of the THM400 sharing the external appearance of the 400. It'll be marked 375-THM on the bottom of the tailshaft housing. It's a light duty version of the THM400, has ABSOLUTELY NO RELATION to the THM375B, and was found in 1972 to 1976 full-size cars. The Turbo 375 was modified to accept the Turbo 350 driveshaft yoke.

THM400 - The THM400 was GM's Heavy-duty 3 speed transmission used from 1964 to 1990. Used on large displacement, high torque engines and engines with towing packages. Generally found in Chevy & GM trucks, cadilacs and large displacement engined, full size GM rear wheel drive cars.

THM700-R4 - 4 Speed transmission used in GM cars and light trucks with the 2.8, 3.1, 4.3, V6, Chevrolet built 305, 350 and 454 engines from 1982 to 1992.

4L60 - Early 1990's saw the 700R4 renamed to the 4L60, and 'electronic' models were named 4L60E. 4L60 means 4 forward speeds, L = longitudily mounted (rear wheel drive). 60 is the strength rating (less than the 4L80).

3L80 - The 3L80 is a renamed THM400, used in the early 1990's. The 3L80HD would be the THM475 (heavy duty unit).

4L80 - An overdrive model of the THM400. The 4L80E would be the 'electronic' model.

Transmissions with a suffix of 'C' on the end of the type (THM200C) indicate the transmission has a lock up torque converter.

Chevy Automatic Transmission Identification: Other Methods

Transmission

Some transmissions have a code stamped onto them. Others have a tag rivited to the case.

Most transmissions will have a 'source serial number' (chassis vin) usually found close to the transmission code. This number will contain division ID #, model year, assembly plant and production sequence (last 6 digits) of the VIN stamped onto the transmission. Example: 19N500001. The source serial number is from the CAR the transmission originally went into, NOT the assembly plant.

Location of source serial number

On the THM350, the VIN will be stamped on either the drivers side housing near the shifter, on the right side of the housing just above the pan, or on a boss behind the bellhousing flange on the passenger side of the transmission.

On the THM400 the VIN is stamped on a machined surface just above the pan on the drivers side.

On the THM200-R4 the VIN is stamped onto the housing towards the rear of the pan, on the drivers side.

On the THM700-R4 the VIN is either stamped onto a boss behind the bellhousing flange on the passenger side, just above the pan on the drivers side, or just behind the governor cover, stamped vertically where the case meets the tailshaft housing.

Gm Turbo 350 Transmission Diagram

Prior to 1967, transmission ID numbers contained the plant prefix code, month and date of production (expressed numerically) and a shift code (D = Day, N = Night). From 1967 on, the ID number contained the transmission type or plant prefix, Date (coded below) and a shift code. The constants in decoding the trans ID number are the date the transmission was produced.

Pre-67 Example: C213N - (C = Cleveland Powerglide, February 13, Night Shift)
Post-67 Example: P9E03 - (P = TYPE, 9 = year (1969), E = Month, 03 = Day of Month)

Month code: (NOTICE this is NOT in alphabetic order)
A = Jan, B = Feb, C = Mar, D = Apr, E = May, H = Jun, K = Jul, M = Aug, P = Sep, R = Oct, S = Nov, T = Dec

The dropbox contains Camaro transmission codes. What SHOULD have been installed, or what was offered for the year selected.

The latest posts on transmissions from the NastyZ28 message board. Please join in the discussion by registering here.Chevy 350 Transmission


Last updated: 10/20/2011
Author: MadMike Maciolek


Return to Main Decoding Page

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All rights reserved

General Motors is an innovator of automatic transmissions, introducing the Hydra-Matic in 1940.[1] This list includes some GM transmissions.

Automatic transmissions[edit]

Early models[edit]

The GM Hydra-Matic was a success and installed in the majority of GM models by 1950. Through the 1950s, all makers were working on their own automatic transmission, with four more developed inside GM alone. All of GM's early automatic transmissions were replaced by variants of the Turbo-Hydramatic by the 1970s.

  • 1940–1967 Hydra-Matic — Oldsmobile (now the trade name for all GM automatic transmissions)
  • 1948–1963 Dynaflow — Buick
  • 1950–1973 Powerglide — Chevrolet (also used by Pontiac, Holden, Vauxhall and Opel)
  • 1968-1971 Torquedrive- Chevrolet ( Camaro and Chevy II, Nova. Manually shifted on Column. )
  • 1957–1961 Turboglide — Chevrolet (V8 models only, except Corvette)
  • 1958–1959 Flightpitch — Buick
  • 1961–1963 Dual Path Turbine Drive — Buick
  • 1961–1964 Roto Hydramatic — Oldsmobile/Pontiac (also used by Holden)
  • 1964–1969 Super Turbine 300 — Buick/Oldsmobile/Pontiac (Oldsmobile Jetaway)
  • 1968–1969 Torquedrive — Chevrolet (manually column shifted 2 speed automatic, 6 cyl only)
  • 1956-1964 4 speed Controlled coupling HydraMatic, also known as Cadillac 315 or P 315 HydraMatic, Oldsmobile Jetaway, Pontiac Super HydraMatic.
  • TempestTorque, ( Pontiac) a two speed based on Powerglide, but having the added feature of ' Split Torque ' dividing the engine power between mechanical connection and the torque converter in high gear.

Turbo-Hydramatic[edit]

The Turbo-Hydramatic was used by all GM divisions, and formed the basis for the company's modern Hydramatic line. The basic rear-wheel drive Turbo-Hydramatic spawned two front-wheel drive variants, the transverseTurbo-Hydramatic 125, and the longitudinalTurbo-Hydramatic 425. A third variant was the light-duty rear wheel drive Turbo-Hydramatic 180 used in many European models.

Heavy-duty rear wheel drive
  • 1971–1994 3L80HD (heavy duty version of TH400)
Medium-duty rear wheel drive
  • 1964–1992 Super Turbine 400/TH400/3L80
  • 1969–1986 TH350/TH350C/TH375B/TH250/TH250C
  • 1972–1976 TH375 — Light duty version of TH400
  • 1976–1987 TH200/TH200C
  • 1981–1990 TH200-4R
  • 1982–1993 TH700R4/4L60
Light-duty rear wheel drive
  • 1969–1998 TH180/TH180C/3L30 — 3-speed European/Asian model. Also manufactured and used by Holden as the Trimatic transmission.
Transverse front wheel drive
  • 1980–1999 TH125/TH125C/3T40 — 3-speed light-duty
  • 1984–1994 TH440-T4/4T60 — 4-speed medium-duty
Longitudinal front wheel drive
  • 1966–1978 TH425 — 3-speed
  • 1979–1981 TH325 — 3-speed
  • 1982–1985 TH325-4L — 4-speed

Electronic Hydra-Matics[edit]

The next-generation transmissions, introduced in the early 1990s, were the electronic Hydra-Matics based on the Turbo-Hydramatic design. Most early electronic transmissions use the '-E' designator to differentiate them from their non-electronic cousins, but this has been dropped on transmissions with no mechanical version like the new GM 6L80 transmission.

Today, GM uses a simple naming scheme for their transmissions, with the 'Hydra-Matic' name used on most automatics across all divisions.

3/4/5/6L/T##-Elll
Number of forward gearsL=Longitudinal
T=Transverse
GVWR rating'E' for Electronic
'HD' for Heavy Duty
First-generation longitudinal (Rear Wheel drive)
  • 1991–2001 4L30-E — 4-speed light-duty (used in BMW, Cadillac, Isuzu, and Opel cars)
  • 1992– 4L60-E/4L65-E — 4-speed medium-duty (used in GM trucks and rear-wheel-drive cars)
  • 1991– 4L80-E/4L85-E — 4-speed heavy-duty (used in GM trucks)
First-generation transverse (Front Wheel drive)
  • 1995–2010 4T40-E/4T45-E — 4-speed light-duty (used in smaller front wheel drive GM vehicles)
  • 1991–2010 4T60-E/4T65-E/4T65E-HD — 4-speed medium-duty (used in larger front wheel drive GM vehicles)
  • 1993–2010 4T80-E — 4-speed heavy-duty (used in large front wheel drive GM vehicles, only with Cadillac NorthStar V8.
Second-generation longitudinal (Rear Wheel drive)
  • 2000–2007 5L40-E/5L50 — 5-speed medium-duty (used in Cadillac's Sigma vehicles)
  • 2007–present 6L45/6L50 — 6-speed medium-duty (used in GM Sigma platform cars)
  • 2006–present: 6L80/6L90 — 6-speed heavy-duty (used in GM trucks and performance cars)
  • 2014–present: 8L90 — 8-speed heavy-duty (used in GM trucks and performance cars)
  • 2016–present: 8L45 — 8-speed light-duty (used in GM luxury cars)
  • 2017–present: 10L80 - Ford-GM 10-speed automatic transmission (used in GM light trucks including pickups and related SUVs)
  • 2017–present: 10L90 - Ford-GM 10-speed automatic transmission (used in GM performance cars)

*This transmission is part of a joint-venture between General Motors and Ford Motor Company to split development of two transmissions, a longitudinal 10-speed and transverse 9-speed. Ford led the design of the 10-speed transmission, as well as filing the design patents for said transmission. According to an official report by the SAE (Society of Automotive Engineers) the design of the 10-speed gearbox is essentially all Ford, while GM was responsible for designing the 9-speed 9T transverse automatic gearbox. As part of their joint-venture, Ford will let GM use the 10-speed transmission with rights to modify and manufacture it for their own applications. In-exchange for Ford's 10-speed transmission, General Motors will let Ford use its 9-speed transmission for front-wheel drive applications; Ford ultimately declined use of the 9T.[2][3][4]

Chevy 350 Transmission Dipstick

Second-generation transverse (Front Wheel drive)
  • 2008–present: 6T30/6T40/6T45 — 6-speed light-duty
  • 2006–present: 6T70/6T75 — 6-speed medium-duty
  • 2016–present: 9T50/9T65 Hydra-Matic – 9-speed[5]

Hybrid and PHEV[edit]

  • 2ML70 - 2-Mode Hybrid transmission.
  • 4ET50 (MKA) - Electric Drive Unit Transaxle (First Generation Chevrolet Volt / Cadillac ELR)
  • 5ET50 (MKV) - Electronically controlled, continuously-variable automatic transaxle (Second Generation Chevrolet Volt)[6]
  • 5ET50 (MKE) - Electronically controlled, continuously-variable automatic transaxle Transaxle (Full Hybrid, Ninth Generation Chevrolet Malibu)[7]
  • 4EL70 (MRD) - Electric Drive Unit Transmission (PHEV Cadillac CT6)

Other automatics[edit]

  • Aisin AF33 — 5-speed transverse automatic made by Aisin AW Co., Ltd.
  • Allison 1000 Series — 6-speed longitudinal automatic made by Allison Transmission
  • Saturn MP6/MP7 — 4-speed automatic developed by Saturn for use in the S-series from 1991 to 2002
  • VTi transmission — continuously variable transmission
  • Tremec M1L transmission — 8-speed Dual-Clutch made by Tremec for the Chevrolet Corvette C8
  • GM CVT250 — continuously variable transmission

Future[edit]

Manual transmissions[edit]

Longitudinal transmissions[edit]

  • Aisin AR5/MA5 — 5-speed longitudinal manual made by Aisin
  • Aisin AY6 — 6-speed longitudinal manual made by Aisin
  • Getrag 260 — 5-speed longitudinal manual made by Getrag
  • Muncie M20 — 4-speed longitudinal wide ratio manual transmission made by GM at their Muncie, Indiana factory
  • Muncie M21 — 4-speed longitudinal close ratio manual transmission made by GM at their Muncie, Indiana factory
  • Muncie M22 — 4-speed longitudinal heavy duty close ratio manual transmission made by GM at their Muncie, Indiana factory
  • Saginaw M26/27 transmission — 3 and 4-speed longitudinal light duty (less than 300 hp wide ratio manual transmission made by GM at their Saginaw, Michigan factory
  • Muncie M62/M64 — 3-speed longitudinal transmission made by GM
  • Muncie SM420 — 4-speed manual used up to 1967, very similar to sm 465 except small changes to gear ratios and location of reverse.
  • New Process Gear NP435 - 4-speed longitudinal transmission used in a select handful of 67-72 GM pickups
  • New Process Gear A833 RPO MY6 or MM7 — 4-speed longitudinal A833 overdrive transmission made by New Process Gear for early to mid 1980s General Motors Light Trucks
  • Muncie SM465 — 4-speed longitudinal manual used in 68- 91 Chevy 1/2 3/4 and 1 ton trucks
  • New Venture Gear NV1500 — 5-speed longitudinal manual made by New Venture Gear
  • New Venture Gear 3500/4500 — 5-speed longitudinal manual made by New Venture Gear
  • Borg-Warner T-10 transmission — 4-speed longitudinal manual currently made by Richmond Gear; originally made by Borg-Warner
  • Tremec T-5 — 5-speed longitudinal manual currently made by Tremec; originally made by Borg-Warner
  • Borg-Warner T-50 transmission — 5-speed longitudinal manual - used by GM in its H Body cars and a few other limited light duty applications from 1976 to 1978;
  • Tremec T-56 — 6-speed longitudinal manual overdrive made by Tremec; formerly made by Borg-Warner
  • Tremec TR-6060 — 6-speed longitudinal manual overdrive made by Tremec
  • ZF S6-650 — 6-speed longitudinal manual made by ZF Friedrichshafen
  • Tremec TR-6070 — 7-speed longitudinal manual overdrive made by Tremec

Transverse Transmissions[edit]

  • F23 — 5-speed transverse manual manufactured by Getrag
  • F35 — 5-speed transverse manual manufactured by Saab in Gothenburg, Sweden
  • F40 — 6-speed transverse manual manufactured by FGP Germany
  • Getrag 282 — 5-speed transverse manual designed by Getrag and manufactured by Muncie Getrag
  • Getrag 284 — 5-speed transverse manual designed by Getrag and manufactured by Muncie Getrag
  • MP2/MP3 — 5-speed manual developed by Saturn for use in the S-Series from 1991 to 2002

Used Th350 Transmissions For Sale

See also[edit]

References[edit]

Chevy 350 Transmission For Sale

  1. ^'Hydra-Matic History: The First Automatic Transmission'. Ate Up With Motor. 2010-05-29. Retrieved 2014-01-15.
  2. ^'Exclusive: An Inside Look At Ford's New 10 Speed Transmission'. http://www.thetruthaboutcars.com/. Retrieved 2015-03-16.External link in publisher= (help)
  3. ^Brooke, Lindsay. 'Ford and GM finally consummate 9- and 10-speed joint development'. articles.sae. SAE International. Retrieved 20 March 2016.
  4. ^'Ford passes on GM's 9-speed automatic transmission'. Retrieved 2018-11-12.
  5. ^Panait, Mircea. 'GM Hydra-Matic 9T50 Transmission Confirmed for Chevrolet Cruze, Malibu, Equinox'. autoevolution. Retrieved 2016-12-07.
  6. ^'GM Service Insights, pg 23'(PDF). Archived from the original(PDF) on 2019-01-09. Retrieved 2019-07-16.
  7. ^'GM Service Insights, pg 23'(PDF). Archived from the original(PDF) on 2019-01-09. Retrieved 2019-07-16.

Chevy 350 Transmission Bolts

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