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The best ones...
Posted by AaronG [Email] (more from AaronG) on Tue, 17 Aug 2010 19:39:10
In Reply to: Crunch bang grind grind grind, junk900junky, Tue, 17 Aug 2010 18:10:37
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Are 1989 and 1990 gearboxes. They have the larger pinion bearing, the better contershaft bearing and the oil drain. The 1991- gearboxes shift a little bit nicer, but have a more fragile shift forks/syncros. They also lack the oil drain, although you could add that. They have a filter in the rear cover, which you could add to the early boxes if so inclined.
In my opinion the best box is part # GM 457-12. That is the 1989-90 non turbo box. It is just as stout as the turbo one, but has the lower gearing, meaning the engine turns lower rpms at a given speed. These boxes are also more likely to work used because they only had the 128hp 2.0 liter non turbo on top of them.
If you want a cheapo, I have a good GM 457-10 box from an 1987 non turbo. It was rebuilt over 100k ago, but it worked fine when I removed it.
posted by 68.80.113...
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