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The Muncie SM420 is a heavy duty, four-speed manual transmission that was produced from 1947 to 1967 by General Motors for civilian use in a variety of pickup trucks, buses, dump trucks and heavy equipment. They were used in some military vehicles into the 1980s. It was replaced in civilian vehicles by the Muncie SM465 transmission in 1968.
First and second gear are integral to the input shaft and cannot be interchanged independently. All transmissions have a third gear ratio of 1.38:1. However, third and fourth gear are clustered on the counter shaft which was available with two different fourth gear ratios: 1.03:1 or .94:1.
The updated input shaft and bearings carried through to the NV3500. All 5 of these transmissions can be interchanged as a complete unit with the following caveats. "Drop-in" interchanges between GM S (S10 etc.) and C/K trucks will require modification of driveshaft length and crossmember placement. GM S models have a longer tail-shaft than C/K ...
There have been three different output shafts for pickup trucks. Early four-wheel drive was a short 10 spline. Later, a 35-spline version was for 2 wheel drive, whereas 4WD units had a 32-spline output shaft. [1] The SM465 was the only manual transmission available for 1988-1991 R/V-series trucks and SUVs. [citation needed]
The designation 3.03 is the centerline distance between counter shaft and mainshaft. The Toploader got its name from the fact that the access plate to the inner workings was located on the top of the main case, as opposed to side access on most gearboxes it would be compared with, such as the Ford Dagenham or GM's Saginaw or Muncie.
A manual transmission has several shafts with various gears and other components attached to them. Most modern passenger cars use 'constant-mesh' transmissions consisting of three shafts: an input shaft, a countershaft (also called a layshaft) and an output shaft. [11] The input shaft is connected to the engine and spins at engine speed ...
The T4 improved this design with tapered roller bearings on the input and output shafts and a straight roller bearing on the counter gear. The T-5 is a T4 with an added overdrive gear. [ 2 ] The T-5 carries a part number of 1352-000- xxx , where xxx is a three-digit application-specific number ranging from 001 to 260 that also can be used to ...
The GM MR6/F40 six-speed manual transaxle was first developed for GM Europe by Saab Powertrain, for use in Saab and Opel applications. Originally a design developed by GM Powertrain Sweden Södertälje - Europe six-speed manual transaxle was originally built by Saab in its transmission plant in Gothenburg, Sweden (2002-2003) but production was moved to Opel in Rüsselsheim am Main, Germany ...
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