Is this an open rearend and what is the gear ratio (see pics) - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-15-2007, 02:21 PM
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Is this an open rearend and what is the gear ratio (see pics)

I'm not real familiar with these, but it's from a 95 Chevy van and I'm wondering if this is an open or locking rearend and what is the gear ratio. I'm guessing it's some type of limited slip, it's got a set of spider gears inside. The numbers on the ring gear are ( 2 10 41 5 95). Also, what are the steel wire clips that bolt to the front of the caps used for?
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Old 02-15-2007, 02:30 PM
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Have you got a pic showing the other side of the ring gear better? Anyway...count the number of teeth on the ring gear as well as the number of teeth on the pinion gear......divide the number of pinion teeth into the number of ring gear teeth........that will be your ratio. All rear ends have spider gears. Without a better pic.....I would have to say that is a open rear end.
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Old 02-15-2007, 02:42 PM
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If the van is handy, look on the glovebox data sticker for the code G80 which is posi.
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Old 02-15-2007, 04:29 PM
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I don't have the van just the rearend. It has a thick ring gear so it must be geared somewhat low. I was assuming the 10 and 41 on the ring gear were the two numbers you used for the ratio. If they are, it's a 4:10 ratio. I didn't count the gears but maybe I will
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Old 02-15-2007, 09:47 PM
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If the 10 & 41 are the last 2 numbers in the string on the outside of the ring gear, you are correct, it's 4.10:1.

If you see 4 gears on the inside of the carrier, it is open. We'd have to see the other side to be sure.
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Old 02-15-2007, 10:13 PM
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Is that from a 3/4 ton or 1 ton van? Almost looks like a 14 bolt. Don't know if the vans had full floating axles or if they were semi-floating only. It almost looks like that carrier splits in half. Are there two, three or four spider gears? That rear end uses adjustment nuts to set bearing preload and ring gear backlash, the clips on the bearing caps are retainers to hold the adjustment nuts in place.

Last edited by Blazin72; 02-15-2007 at 10:21 PM.
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Old 02-16-2007, 05:42 AM
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It's from a 1 ton. It IS a 14 bolt. It has 8 bolts on the outside axle end cap (by wheel). I'll try to get another pic.
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Old 02-16-2007, 09:03 AM
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its 4.10 and yes some vans got the 10.5" FF 14 bolt


yes


but only the G30 ones

most all were G10 and G20 however

ambulances and HD work vans were G30

not many were sold though

but you see one now and then

others were dually and had a box mounted on the rear, from the front seats back, front chassis and doors and front roof and clip were all normal van assembly line built

cube vans, box vans, roll down door vans, tool box vans, etc, most all were dually rear instead of SRW like the full body G-30 were
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Old 02-16-2007, 09:03 PM
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Sounds like you might have a nice rear end there. What are your plans for it? I've started a small collection of the full floating 14 bolts.
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Old 02-17-2007, 07:57 AM
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Quote:
Originally Posted by Henry Highrise
All rear ends have spider gears.
Not exactly.
I installed a Zexel Torsen (worm gear driven) differential and 3.73 gears in my 96 Trans Am a couple of years ago. It has side gears although not exactly the same as a non-Torsen design. Instead of spider {differential} gears the Torsen uses invex gearing: a modified crossed axis helical gear mesh.
Here's some photos of my unit:
pic 1
pic 2
pic 3
Some pics of the install at my shop
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