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Old 02-19-2006, 08:29 AM
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Backlash

Hello, I am preparing to do my first rear gear swap and I have been doing alot of reading. I think I have a decent understanding of all of the terms except backlash. All the articles I have been reading say to check the backlash, but I am not clear on what it is exactly. Is the the amount of free play in the ring gear as it meshes with the pinion before the axel actually spins? Any last minute advice for a rear end newbie? Thanks guys. By the way I am going from a 3.08 to a 3.73. (GM 12 bolt) in a 74 Chevy 1/2 ton.

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Old 02-19-2006, 08:49 AM
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This applies to all axles.
Somehow (anyway you can think of) lock the pinion shaft from moving.
Move the ring gear either up or down as far as it will move with the pinion gear locked from al free movement.
Use any measuring device you can (that can either be held down by magnet or bolted down) and rest it against a ring gear tooth.
Move the ring gear the opposite direction, and check how far the ring gear moved, this should be measured in thousandths of an inch as it is the common standard.
There is your backlash measurement.
Check more than twice.

Just out of curiousity are you changing the ring gear carrier to a series-4, or do you have a series-3 set of 3.73 gears to fit the series-3 carrier in your truck?
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Old 02-19-2006, 11:04 AM
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Here are installation instructions that should clear things up for you: http://www.ringpinion.com/downloads/yukoninstman.pdf
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Old 02-19-2006, 11:40 AM
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M&M-With me being very ignorant when it comes to auto rear ends (good with female rear ends though)I am not really sure what series I have. It is a 3.08 truck set. I do know that the new set that will be installed has the matching carrier mounted to the ring w/matching pinion and all hardware. Does that help any? I read on another site that the 3.08 may be a series 2, but I think that may be for a car. I am not sure. Can you clear this up some?

71c10-Thanks for the link, I have been looking over that one for a couple days. Good info there.
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Old 02-19-2006, 03:58 PM
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If your gears are stock you have a series-3 carrier (2.73 - 3.42), and for a set of 3.73 gears you will need to swap to a sries-4 (3.73 and UP), unless you buy a set of 3.73 gears specifically machined to fit a series-3 carrier.

That is for a 12 bolt 8.875 and the 10-bolt 8.5.

The 7.5/7.625 has a carrier break of 2.73 for a series-2, and 3.08 and UP for series-3.

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Old 02-19-2006, 05:20 PM
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I am not sure if the new one is a 3 or 4 series. I didn't know enough about rear ends to ask when I purchased it. I do know that the appropriate carrier is attached to the ring gear. I have not received it yet. I assume it will be a 4.
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Old 02-19-2006, 06:57 PM
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If it comes with a carrier, you have nothing to worry about.

If it's for your 8.875" truck axle housing it will work.

I have about 6 of this very same axle out in the storage yard, along with the 10.5 14-bolt, and a few of the 8.5's, and a bunch of & ton 8.5 and Dana 44 front axles, so I am a little familiar with them.
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Old 02-19-2006, 07:03 PM
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Yea, I guess you are. I wish I had all of that just laying around. I have alot of engine stuff though. Anyway, thanks for the good news. The first time I read your last post I thought it said that it will NOT work. I had to re-read it. Then I was relieved. I am looking for posi.
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Old 02-19-2006, 07:24 PM
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I don't have anything posi laying around, and only have one GovLok 8.5 that I haven't even bothered to look at what ratio it is yet.

Rock crawling and mud bogging don't treat a clutch type traction aiding differential very good at all, so the open cases are what sells around here, and installing an aftermarket locker in place of the spider gears can be done by anyone whether they have any knowledge of setting up gears or not.
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