Heres how to determine pinion depth when changing gears in a 9 bolt!!!
08-19-2003, 12:34 PM
#1
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Car: 1989 Iroc-Z
Engine: 350ci SBC
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Heres how to determine pinion depth when changing gears in a 9 bolt!!!
Heres how to determine pinion depth when changing gears in a 9 bolt!!!
After much searching and many emails I have found the correct way to set the pinion....
Assuming you have purchased a replacement gearset for an existing axle ie the old part number and the new part number are the same (The part number is stamped on the pinion and ring gear). Such as if you bought your gearset from Diffsolutions. So this being the case you need to know what pinion shim to use. Each pinion has a hand written marking, normally white or yellow, on the end, something like 0, +1 or -2. You need the marking from the old and new pinions. If the old pinion was say -2 and the new pinion is say +2 the new pinion varies by +4 from the old pinion. This means you need a pinion shim 4 thousands under the current size. This is only a starting point as backlash and gear mesh must be checked. The way the gear set is built into the carrier is critical for noise and fatigue life of bearings and gearset.
Hopefully this helps.....
After much searching and many emails I have found the correct way to set the pinion....
Assuming you have purchased a replacement gearset for an existing axle ie the old part number and the new part number are the same (The part number is stamped on the pinion and ring gear). Such as if you bought your gearset from Diffsolutions. So this being the case you need to know what pinion shim to use. Each pinion has a hand written marking, normally white or yellow, on the end, something like 0, +1 or -2. You need the marking from the old and new pinions. If the old pinion was say -2 and the new pinion is say +2 the new pinion varies by +4 from the old pinion. This means you need a pinion shim 4 thousands under the current size. This is only a starting point as backlash and gear mesh must be checked. The way the gear set is built into the carrier is critical for noise and fatigue life of bearings and gearset.
Hopefully this helps.....
08-19-2003, 12:38 PM
#2
TGO Supporter
never did a 9 bolt but i don't think i'd trust that method as much as i would a hard number like on all the other gear sets i've done, but it does look to be a quick and easy way to do it. i have in the past measured bearings to make sure they were the same or not the same and add or removed shim thickness to allow for the differant bearings, sort of like what you're saying.
08-19-2003, 05:20 PM
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Car: 1989 Iroc-Z
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Well thats the way the manufacture does it...doesnt matter if you trust it or not....that is the way its done for the 9 bolt.
08-20-2003, 05:00 AM
#4
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so as i under stand this the makers don't have control over the gear sets but they do the houseing. that is in reverse of both 10 bolts, 12 bolts, and 9" (only rears i've done). how about a link this is interseting.
08-20-2003, 04:25 PM
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Car: 1989 Iroc-Z
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I dont think you're understanding the method...email me privately if you need more info. They do have control...that is why they stamp the gears with 0, +1, -2 etc. From the stock gears you go from there......
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