What rear end do we really got????
What rear end do we really got???? What rear end do we really got is it the 7 1/2 or the 7 5/8 because i was reading about the Monte Carlo SS from the 80's how they upgraded their rear end from the 7 1/2 to a 7 5/8
They are nearly the same anyway. The gears are identical in diameter even though they go by 2 different names, the only difference is the axle spline. 7.625 has 28 spline, and the 7.5 has 26 spline. GM changed the part numbers for the gears but they are the same for both. If you were to find an older set of 3.73's from a Monte SS and compare them to a set of 7.6 3.73's from a later S10 you would see they are the same aside from a difference in the shape of the pinion shaft(not the actual gear part) that has no effect on performance.
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Last year for the 7.5" rear was 1984. They "upgraded" to the 7.625" in 1985. So all 1985-2002 "small" 10 bolts are correctly termed as 7.625", even though many still call them 7.5". Regardless, all parts are interchangeable.
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Originally Posted by Marc 85Z28
Last year for the 7.5" rear was 1984. They "upgraded" to the 7.625" in 1985. So all 1985-2002 "small" 10 bolts are correctly termed as 7.625", even though many still call them 7.5". Regardless, all parts are interchangeable.
I'm no rear end expert but even I can tell you that one friend...the almighty dollar. It's all about saving money and pinchin pennies when you can and that's just one of the things they probably felt they could leave to the aftermarket and I say DAMN them for it!
Originally Posted by mzoomora
89 was the first years for the 7.6, that was the change to 28 spline.
