Which rear end is everybody using?

[addicted2dunes]

Dana 80 Dually

[Lil'Debbie57]

Cool thanks, I need a new rear end. My truck just waste too much gas.

[56ClassicTruck]

I have a 10 bolt from a 1978 camaro lt, with drum brakes non pose don't no what gear it has or how to find out I just thought it worked good in the camaro? I am thinking of changing it to don't know yet??????

[Kabwe]

Originally Posted by 56ClassicTruck

I have a 10 bolt from a 1978 camaro lt, with drum brakes non pose don't no what gear it has or how to find out I just thought it worked good in the camaro? I am thinking of changing it to don't know yet??????

If you want to know your gear ratio on a 10 bolt 8.5 which you have. Take the cover off and turn the ring gear until you see a set of numbers stamped on the edge of the gear this is the tooth counts for the ring and pinion. You divide those numbers and it will give you your gear ratio. For example if the numbers are 48:14 you divived 48 by 14 and it will give you 3.428 which is 3.43 gears.

[mylow53]

wow kabwe pretty smart trick. i wouldn't have figured that out...
GT

[Kabwe]

Originally Posted by mylow53

wow kabwe pretty smart trick. i wouldn't have figured that out...
GT

I know its pretty sick that I know this stuff, what can I say I was born into a family of lowriders. You should see me in the junk yard.lol People looking at me wondering " Why is he taking the cover off all those rearends and punching on his calculator.lol

[addicted2dunes]

Or an even easier way to check gear ratio is to hold one axle shaft solid, spin the other axle shaft and count how many times the pinion rotates. 3.5 is 3.43's, 3.75 is 3.73's. This trick usually works well, especially if you don't want to open the axle up. If the axle has a locker then you don't have to hold one axle shaft solid.

[56ClassicTruck]

Originally Posted by Kabwe

I know its pretty sick that I know this stuff, what can I say I was borning into a family of lowriders. You should see me in the junk yard.lol People looking at me wondering " Why is he taking the cover off all those rearends and punching on his calculator.lol

LOL I got a visual I can see you in a junk yard like a kid in a candy store!!!LOL.. Thank for the info good to no!!!! I get your mail reply too thanks....

[Kabwe]

Originally Posted by addicted2dunes

Or an even easier way to check gear ratio is to hold one axle shaft solid, spin the other axle shaft and count how many times the pinion rotates. 3.5 is 3.43's, 3.75 is 3.73's. This trick usually works well, especially if you don't want to open the axle up. If the axle has a locker then you don't have to hold one axle shaft solid.

That is guessing a gear ratio, not knowing the exact gear ratio. I do this sometimes as a guessamate, but I always take the cover off, when its home, I may be nuts but I want to know exactly what I have. They also have a tag on them (if not removed) that tells you the gear rato and if its posi thats usually on the top bolt of the cover. I don't trust that either I buy parts from people and some people switch tags and stuff.lol Its only few bolts and some stinky gear oil to take the cover off and know exaclty what you have.

[1950 GMC]

Does anyone know what rear end gear came in a 1983 S15? It had 2.8L V6 I believe.

[kustombrad]

I have an S-10 Blazer rear in my truck. The S-10's came with 3 or 4 gear ratios and the optional factory locker. Only way besides counting teeth like Kabwe said, was to look at the build options on the glovebox of the truck. Mine was the GU6 (3:42's followed by G80 which is Posi) thats what I needed. As far as rearends that can take abuse the 9" design is king if you're making 900+ horsepower, anything less and I'd stick with the Chevy stuff. 10 and 12 bolts take 30 LESS horsepower to turn than the 9" (pinion angle on the ring and an extra pinion bearing) so if you have a mild motor, use the Chevy stuff and enjoy the extra HP and mileage! 12 bolts can be set up to be really tough and I know of a guy who ran 9's with a 10 bolt!

[cajundragger]

I have a 11 bolt of a mid 60's gm
big car. It has a posi, richmond 4.10s, and moser axles. Soon to be narrowed but I think it's 66 inches

[DransportGarage]

Originally Posted by addicted2dunes

Or an even easier way to check gear ratio is to hold one axle shaft solid, spin the other axle shaft and count how many times the pinion rotates. 3.5 is 3.43's, 3.75 is 3.73's. This trick usually works well, especially if you don't want to open the axle up. If the axle has a locker then you don't have to hold one axle shaft solid.

I just did this. I got almost 2 revs (about 1.95)! What's up with that? Do I multiply X2? This appears to be the original rear end ('55 stepside).

Thanks,

[nebdrummer]

stock c- clip axle 8.5 10 bolt. auburn gear center, with richmond 4.10's. just ordered comp. engineering 4 link kit, QA1's rear pro coilover "kit". seeing if i can snap an axle with the power at hand.

next winter order, 9" housing ends, mosier 30 splines, eaton diff., lpw rear end girdle, and some 3.08's

[Steve@OldSub.com]

Originally Posted by DransportGarage

I just did this. I got almost 2 revs (about 1.95)! What's up with that? Do I multiply X2? This appears to be the original rear end ('55 stepside).

Thanks,

Multiply by 2. 2 x 1.95 = 3.90

I believe 3.90 was the standard ratio in the stock half-ton rear in '55.

You must have a calibrated eye to see 1.95 revolutions. I'd have trouble unless I measured things getting that accurate.

[DransportGarage]

Originally Posted by Steve@OldSub.com

<snip> You must have a calibrated eye... <snip>

I'm one of those engineering types. (It's a sickness.) I put the ol' chalk marks down on both the yoke and the brake drum, then spun the dial. Could tell it was just under 2 revs.