Gm 4 speed manual transmission identification

GM Manual Transmission Identification. 7 bolt side cover 1970 454 Chevelle.

If it starts with an S you are looking at a three-speed Saginaw.

Gm 4 speed manual transmission identification. While its obvious that the four speed will use three shift-linkage arms and the three speed will have two if the first letter is R then you have found a four speed. If it starts with an S you are looking at a three-speed Saginaw. GENERAL MOTORS 4 SPEED TRANSMISSIONS.

1957-88 Cars 1968-70 Vans. 39 Cases extension housings and side covers may be cast iron or aluminum and in any combination thereof. Casting number T10-XX or 13-04 are on passenger side of case.

They all have 9-bolt side covers and 36 tooth synchro rings. There are 2 different styles of shifter shafts for GM 4 speed transmissions. Muncie 4 speed transmissions used both versions Saginaw 4 speeds used bolt style and T-10 and ST-10 4 speeds use stud style.

The reason the style of the transmission is important is for transmission lever and shifter installation parts identification. How to Identify Chevy 4 Speed Transmissions. The primary four-speed manual transmissions used by Chevrolet are the Saginaw Muncie and Borg Warner models with Saginaw and Muncie units being specifically made for Chevrolet.

Saginaw and Borg Warner models are normally used on general purpose applications. Muncie transmissions are known for both high-performance and heavy-duty applications with three different variations available. The M20 M21 and M22.

MUNCIE Shaft Identification The above Muncie 4 speed transmissions can be distinguished from the style of the transmission arm attachment. Pre 69 Muncies use a stud nut at the indicated attachement point while 69 and later Muncies use a bolt as illustrated on the right. MUNCIE M-22 453 GM.

7 bolt side cover 1970 454 Chevelle. As mentioned above modern 5-speed and 6-speed manual transmissions are easy to identify but older 4-speed transmissions have more variety. While there are no distinctive pans and bolt counts to make transmission identification simple 4-speed manual transmissions can be generally identified by examining the side profile.

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 12 34 and 1 ton trucks.

Due to the wide combination of ids stampings numbers etc. Varied and even GM couldnt keep track of what was what its best to ID your gearbox visually taking what is stamped on the box FWIW. The best way to ID the transmission is to count teeth.

Muncie 4 speed spline groove and tooth count characteristics. New Process four-speed manual transmissions came in three versions. The aluminum or iron-cased 440MY6 helped power 1981 to 1987 trucks and featured a non-synchronized first gear.

The low-gear 435 was found on 1964 to 1972 vehicles. The casting numbers starting at C-9 followed by four digits. You can copy and paste this link to share.

This is the standard Muncie 4-speed. It has a seven-digit serial number. Cast into the case on the passengers.

These are usually the first. Numbers used to start the identification. Vehicle Identification Number Stamped Into The Main Case 56 Another way to confirm that the transmission is original to your car is most Muncie four-speed transmissions will have a Vehicle.

The early production Muncie four-speed case is the small-bore unit and can be identified by the GM casting number 3831704 see Muncie M20M21M22 Main Case Identification chart. Heres how you ID a Saginaw 4-speed trans. 4 speed Saginaws no lines 284-201-134-100 1 line 254-180-144-100 common 1 Line 254-180-132-100 rare 2 Lines 311-220-147-100 3 Lines 350-246-165-100 And imho the rare 254 tranny would live the longest behind a good motor.

And next the common 254 tranny. GM Manual Transmission Identification. Engine Prefix and Suffix Codes.

Factory Option and Trim Codes. GM Automatic Transmission Identification. GM Manual Transmission Identification.

GM Body Trim Tag Decoding. GiottoPress by Enrique Chavez. Muncie 4-speed transmissions can be distinguishedvfthe rom style of the transmission arm attachment.

Pre-1969 Muncies use a stud and nut at the indicated attachment point while 1969 and later Muncies use a bolt as illustrated on the right. PRE 69 MUNCIE ALL BORG-WARNER SHAFTS TRANS ID 451 69 LATER MUNCIE TRANS ID 452453. Saginaw 4 Speed Identification.

February 6 2017 by Jason. The Saginaw four speed transmission is a transmission that was used in a variety of GM cars in the 60s. They were popular in the Muscle Car era.

As a rule of thumb they were not built to handle the kind of power that a Muncie transmission could handle. Chevy 4 speed manual transmission identification isnt difficult if you know what to look for in the part. Luckily the makes are different enough to give you at least a starting point.

Though the serial number convention is sometimes confusing there is a method in the madness that makes knowing which one you have an easier task. The SM465 is a four speed RWD or 4WD transmission. The SM465 is a Muncie engineering design this transmission is a top loader tower shifter with a non synchronized granny low 1st gear.

2nd through 4th gear uses brass syncro rings bushings are used under all gears on the main shaft. 3rd and 4th gear are the only gears removable from the counter shaft. 4 Speed Transmission Identification Chart We often have customers asking us how can they identify the 4 speed transmission in their car or truck.

The chart on the link below will help you ID your trans to help you figure out what is the correct Hurst Shifter and Linkage Installation kit.