axel gears? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

special70gmc · 10-21-2002, 05:05 PM

i have a 4.10 rear 10 bolt stock rear. my truck is a 3/4 ton im tryin to figure out if its posi what do you think is it also its a 70 gmc 2wd

special70gmc · 10-21-2002, 09:24 PM

c mon i know some one can help me?

but i also wanna know whats the best gers for some hwy mosly around town? 3.56?

crazy longhorn · 10-21-2002, 10:06 PM

Unless you go aftermarket, 4.10 is about as good as it gets on the corporate rear diff. I think some of the guys were talking about 3.90 & possibly a 3.73 ratio available.....but expensive. You could look around for a dana 60 with a 3.54 ratio, & swap it in to get a better all around gear. as far as posi unit, try jacking up the rear, & turn 1 wheel.....if the other turns the same direction, its posi.....if it turns backward, then its open. Hope that helps ....crazy AL

Fred T · 10-21-2002, 10:19 PM

Crazy Al's right about limited options on improving your rear gears. Randy's Ring & Pinion www.ring-pinion.com makes a set of 3.90 gears, but your pockets will be empty

. The best way to regear a 3/4 ton is to get a 14 bolt from salvage. Full floaters are readily available with 3.73 gears, a local yard told me that you can now get 3.42 gears, too. Someone else here said the 3.42 are only semi-floaters, so I'm not sure.

10-21-2002, 05:05 PM	#1
special70gmc Registered User Join Date: Sep 2002 Location: long island, new york Posts: 1,333	axel gears? i have a 4.10 rear 10 bolt stock rear. my truck is a 3/4 ton im tryin to figure out if its posi what do you think is it also its a 70 gmc 2wd __________________ 1986 c-10 swb 5/7 drop 20'' coys 1958 belair 2door

10-21-2002, 09:24 PM	#2
special70gmc Registered User Join Date: Sep 2002 Location: long island, new york Posts: 1,333	c mon i know some one can help me? but i also wanna know whats the best gers for some hwy mosly around town? 3.56? __________________ 1986 c-10 swb 5/7 drop 20'' coys 1958 belair 2door

10-21-2002, 10:19 PM	#4
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	Crazy Al's right about limited options on improving your rear gears. Randy's Ring & Pinion www.ring-pinion.com makes a set of 3.90 gears, but your pockets will be empty . The best way to regear a 3/4 ton is to get a 14 bolt from salvage. Full floaters are readily available with 3.73 gears, a local yard told me that you can now get 3.42 gears, too. Someone else here said the 3.42 are only semi-floaters, so I'm not sure. __________________ Fred There is no such thing as too much cam...just not enough engine.

10-21-2002, 10:06 PM	#3
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	Unless you go aftermarket, 4.10 is about as good as it gets on the corporate rear diff. I think some of the guys were talking about 3.90 & possibly a 3.73 ratio available.....but expensive. You could look around for a dana 60 with a 3.54 ratio, & swap it in to get a better all around gear. as far as posi unit, try jacking up the rear, & turn 1 wheel.....if the other turns the same direction, its posi.....if it turns backward, then its open. Hope that helps ....crazy AL



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