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Old 10-28-2013, 02:35 PM
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need gm rear end?

what gm w/3.73 running gear measurement backing plate to backing plate 56 inches, 1/2 inch eather way? thanks, Dana

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Old 10-28-2013, 03:02 PM
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What is the width of 12 bolt rear axle
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Old 10-28-2013, 03:06 PM
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I think S-10 4x4 fits that so it is off to the pick a part with a tape measure..

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Old 10-28-2013, 03:49 PM
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Don't use backing plate measurements. You will end up with something that won't work by doing it that way. Backing plates and brake drums have different offsets, so that's not an accurate way to measure rear end width. Always go by the total width of the rear end, where the wheels bolt on.

It's possible that a 2nd gen Camaro rear end would work for you. They are 61 inches total width.
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Old 10-28-2013, 04:13 PM
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Quote:
Originally Posted by big gear head View Post
Don't use backing plate measurements. You will end up with something that won't work by doing it that way. Backing plates and brake drums have different offsets, so that's not an accurate way to measure rear end width. Always go by the total width of the rear end, where the wheels bolt on.

It's possible that a 2nd gen Camaro rear end would work for you. They are 61 inches total width.
I used an 8.8 rear out of 2000 Explorer. All depends on what suspension U want to run. I used triangulated 4 bar with shock wave air ride so The 8.8 made for a great choice.
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Old 11-05-2013, 12:17 AM
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need rear end

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Originally Posted by 39chevy View Post
what gm w/3.73 running gear measurement backing plate to backing plate 56 inches, 1/2 inch eather way? thanks, Dana
What is wrong with the one you have?
If you are getting a loud clunk when shifting from reverse to drive or get wining you are better off just replacing the gear set. If you want while you have the differental out just go ahead and replace the diff as well. You can upgrade to a POSI unit (clutch type) or go to a gear type like Eatons Detroit locker (no it's not a locked drag race spool) or a Torison just is a little more. Both are a gear type Posi so they don't have clutches to chatter or wear out and you do not need to add the posi additive that clutch type need to work correctly. There is no adjustments needed and work great on the street. For an additional amount you can get a kit that has ever bearing, bearing race, seals and rear cover gaskets. Every thing to rebuild your rear in one box. It even comes with a short acid brush and a little tube of gear mesh compound to use to set up the pinion/ ring gear.
To have this done runs around $1500 - $2000. The only additional money would be for pressing the pinion bearing on after you put the correct thickness of shims on the pinion gear. Have the old pinion gear bearing removed and sand the inside enough to allow the bearing to go on the new pinion snug, that way you can change the shims without having the new bearing pressed on and off 4 or 5 time (it will take at least 4 trys to get the shim thickness correct unless your real lucky or you have the tool which you can buy from summit racing).
The tool I just mentioned measures the distance from the center of the axle tube to the face of the pinion. That measurement is scribed into the face of the pinion gear and makes the set up way easyer than the old way of having to use a dial gauge on a magnetic base and a special tool to find the center of the axle tube. This you just slide a few shims onto the pinion then slide on the old bearing you opened up, put the pinion in the housing then put the tool in the axle tube, when you have to correct slim thickness the gauge tool will be aganist the face of the pinion with no play. It makes setting the pinion depth a lot easyer.
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Old 11-05-2013, 12:26 AM
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The correct way to measure to rear end is to remove the backing plates and measure from the end of the axle tubes ( square flange where the acking plates bolt to. It's a good idea to also measure spring perch to spring if you replace the whole rear and don't rebuild it.
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Old 11-05-2013, 05:59 AM
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Originally Posted by automan_1954 View Post
The correct way to measure to rear end is to remove the backing plates and measure from the end of the axle tubes ( square flange where the acking plates bolt to. It's a good idea to also measure spring perch to spring if you replace the whole rear and don't rebuild it.
Why would you measure to the end of the axle tubes instead of measuring the total width where the wheels bolt on? The total width is what is important. Rear ends have different amounts of axle hang out, so measuring the housing width is not going to be accurate. When GM uses 2 3/4 inch axle hang out on most of their rear ends and Ford uses 2 1/2 on some of thiers and different amounts on others then your measurements are not going to work after the axles are installed.
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