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GM discontinues S-Series Pickups. This is the last year that the ZR2 is available on a pickup. A GMC Jimmy ZR2 surfaces in Canada. The Jimmy ZR2 was unavailable in the USA. 2004 - ZR2 available on Blazer and Tracker models. For the first time, the ZR2 is offered in 2WD. GM discontinues Tracker including ZR2 model.
The complete configuration of a GM vehicle (as it exited the factory) can be described by specifying the base model and a complete list of its RPO codes. [1] Some dealerships are willing to run a VIN and print out its RPOs (with their definitions) free of charge. The records are in GMs' electronic database since at least the 1990 models.
Profile of a spur gear Notation and numbering for an external gear Notation and numbering for an internal gear. The tooth surface (flank) forms the side of a gear tooth. [1] It is convenient to choose one face of the gear as the reference face and to mark it with the letter “I”. The other non-reference face might be termed face “II”.
The GM AAM axle tubes exhibit a smaller diameter at the spindle compared to the AAM Dodge axles—measuring 4" for GM and 3.5" for Dodge from the housing. In design variation, newer GM trucks are aligned with Dodge axles. Additionally, GM incorporates a vibration damper on the yoke, while Dodge positions it on the drive shaft.
GM's Automatic Safety Transmission (AST) was a semi-automatic transmission released in 1937. The first mass-produced fully-automatic transmission developed for passenger automobile use was the GM Hydramatic introduced in 1940. [1] The Hydramatic was a big success, and had been installed in the majority of GM models by 1950.
The first version, RPO code MG2 was used for all GM V6 applications (FWD and the RWD Fiero) and the second version, RPO code MG1, was used for the 2.0 L turbocharged engine used by Pontiac and Buick. Gear ratios are given below, as taken from the GM Product Service Training Manual. MG2 and MG1 ratios: 1st gear: 3.50:1; 2nd gear: 2.05:1 (MG1: 2. ...
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The GM 9.25 IFS has been the main front differential in Four-wheel drive 3/4 Ton and 1 Ton GM trucks since 1988. The Dana 60 solid axle front end was used selectively in trucks with a higher GVWR from 1988 to 1991. The original Saginaw 9.5 differential, ring and pinion were modified to work with the independent front suspension.