GM Astro/Safari 1985-1996 Repair Guide

Identification

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Manual transmissions are identified by using the following descriptions:



The number of forward gears.
 
The measured distance between the centerlines of the mainshaft and the countergear.
 

The 4-speed (76mm) transmission is a fully synchronized unit with blocker ring synchronizers and a sliding mesh reverse gear. The transmission case houses the various gears, bearings and shafts, a shift control cover and an extension housing. The floor-mounted gearshift lever assembly is located on top of the extension housing; the shifting mechanism is connected to the shift control cover by adjustable shifting arms. The MR2 model is used in combination with both engines.

The 5-speed (77mm) transmission is a fully synchronized unit with blocker ring synchronizers and a sliding mesh reverse gear. It has an aluminum transmission case that houses the various gears, bearings and an extension housing. The floor-mounted gearshift lever assembly is located on top of the extension housing. The ML3 model, is used with the 2.5L engine; the MH3 model is used with the 4.3L engine.

In 1990, the Astro/Safari van could be ordered with All Wheel Drive as an option. At this redesign, the manual transmission was eliminated from the Astro and Safari line. From this point forward, all of these vans were produced with an automatic transmission.

 
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