Cascade Crew

townaj · Posted: Sun Mar 13, 2011 7:21 pm Post subject: Posi Question...

Right now I have a posi rear axle out of a 95 firebird. But it has a 2.73 carrier and I want to put 3.73 gears in it. I know they make the special gears, but I would rather replace the whole posi unit with a Torsen type out of a newer camaro or firebird, but will it fit? Thanks guys

Alphius · Posted: Sun Mar 13, 2011 9:24 pm Post subject:

townaj · Posted: Mon Mar 14, 2011 6:40 am Post subject:

Ok cool thanks. I wasn't totally sure..

Alphius · Posted: Mon Mar 14, 2011 7:18 am Post subject:

As long as you have 28-spline axles (which you do in a '95 rear) and you have someone competent set the gears up, you'll be fine. The carrier will physically fit your case.

townaj · Posted: Tue Mar 15, 2011 8:09 pm Post subject:

Yeah the splines should be good. I'm definitely going to find someone to help me with the gears and stuff.

blue89 · Posted: Tue Mar 15, 2011 9:11 pm Post subject:

Yes, 10 bolt is 10 bolt as long as the spline count is the same (26 or 2 Cool

. Since you have a 2 series carrier you can either get a thick crown gear or a spacer. My 10 bolt in the garage has a 2 series 26 spine auburn posi with ring gear spacer and 4.11's.

I don't know what setup you have, but 3.73's are an excellant choice for performance and cruise-ability.

townaj · Posted: Thu Mar 17, 2011 6:11 am Post subject:

Where did you find your gears? I have been having problems finding the thick ones. I have a 383 with a t5 behind it. Im getting tired of having to rev it so high to take off in first. My clutch needs absolutely no help slipping lol. I heard 3.73s were a good gear to run from a lot of people so I really want to get them. I just cant really find them

blue89 · Posted: Thu Mar 17, 2011 8:02 am Post subject:

Randy's ring and pinion has them. If you go the catalog page with the 10 bolt stuff it should be listed with the ring gear. I'll take a look and tell you exactly where.

Wouldn't you know it, they changed the catalog. Give them a call and ask about thick crown ring gears for 10 bolt 2 series carriers.1866-631-0196

Quasi-Traction · Posted: Fri Mar 18, 2011 3:28 pm Post subject:

http://www.summitracing.com/parts/RMG-4900071/

townaj · Posted: Sun Mar 20, 2011 6:33 pm Post subject:

Ok cool thanks a bunch. Now i get to find the money haha. So what would my rpm's be in 5th gear at 70? Speed limits around here are high..I was looking for something around 2000 or 2500 maybe

Al Hasse · Posted: Sun Mar 20, 2011 6:39 pm Post subject:

My 3.73 put me somewhere between 2300 and 2500 in 5th, but my speedometer is off just a tad too, 70 indicated is about 67.

Alphius · Posted: Sun Mar 20, 2011 7:07 pm Post subject:

townaj · Posted: Mon Mar 21, 2011 1:49 pm Post subject:

Sweetness thanks. Looks like if i have a .73 5th gear ill be turning about 2400 at 70 mph. If 5th is .63 it'll be 2100. I can't remember what my transmission came out of so its one of the two. Thats not bad i think Im gonna go for it

Twilightoptics · Posted: Mon Mar 21, 2011 3:18 pm Post subject:

TPI cars got the .7ish OD and LG4/TBI Cars got the .63

townaj · Posted: Mon Mar 21, 2011 4:01 pm Post subject:

It supposedly came off a Z28 or IROC if that makes a difference? I know its NWC though

Twilightoptics · Posted: Mon Mar 21, 2011 5:02 pm Post subject:

Probably a .7 then

townaj · Posted: Mon Mar 21, 2011 5:40 pm Post subject:

Thats what i was thinking. Well Im gonna do the 3.73s then. I get to find someone to help now. Ive heard that 10 bolts are hard to set up so they are quiet?

Twilightoptics · Posted: Mon Mar 21, 2011 6:25 pm Post subject:

Setup is no harder than any other non-drop out rear. Gotta have the right tools to remove the bearing without destroying it to set your shims.

Gear brand has more to do with noise. GM gears are the quietest. Richmond and Yukon are notoriously loud.

chevymad · Posted: Mon Mar 21, 2011 6:32 pm Post subject:

Also matters if a set has been installed before or not. If its been run in before then it will probably make noise the 2nd time.

townaj · Posted: Tue Mar 22, 2011 1:54 pm Post subject:

Ok sweet. I'm ordering the gears today so hopefully I'll install this weekend