Need help picking a posi - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chevyman8 · 10-07-2009, 08:00 AM

I picked up a 12 bolt rear the other day that I'm going to drop 3.73 gears into. I also want a posi, but I know what to get. My '84 is my daily driver that is also taken to the track. What's a good posi to drop in it? What are you guys runnin?

**americanmusc1e** · 10-08-2009, 03:06 PM

I'm runnin' an open differential and in need of a posi (and gears) too......subscribed

Outlaw72 · 10-08-2009, 03:06 PM

Quote:

Originally Posted by chevyman8

I picked up a 12 bolt rear the other day that I'm going to drop 3.73 gears into. I also want a posi, but I know what to get. My '84 is my daily driver that is also taken to the track. What's a good posi to drop in it? What are you guys runnin?

I have an Auburn in mine.....it has held up very well. I shattered the rear in my truck launching on the bottle almost 2 years ago and that is the only part I did not have to replace. Still going strong..

AirMale · 10-08-2009, 07:05 PM

I've had both Eaton and Auburn and prefer the Eaton. Eaton is rebuildable and hooks straighter.

BossHogg69 · 10-08-2009, 08:37 PM

I put an Auburn in my a DD '92 C1500 5.7/5 spd that I took to the track every now and then. I liked it because it was smooth and didn't make any noise. I had 3.73's, Lakewood traction bars and a 4" rear drop and it hooked pretty good.

chevyman8 · 10-08-2009, 09:29 PM

I appreciate the input. How about gears? I heard Richmonds whine and break a lot. I was told Motive gears are the way to go.

BossHogg69 · 10-08-2009, 10:25 PM

i used Yukon gears in my '92 when I put in the Auburn. they were quiet too, and I never had any problems out of them either. I've never used Motive or Richmond.

ProStreet71 · 10-08-2009, 10:40 PM

If set up properly, gears should not whine regardless of manufacterer.

wheatlandbrawler · 10-09-2009, 12:03 AM

Quote:

Originally Posted by ProStreet71

If set up properly, gears should not whine regardless of manufacterer.

couldnt agree more... and i run richmond's in my 8 second malibu.... nver had a problem.

Marv D · 10-09-2009, 01:17 PM

Quote:

Originally Posted by AirMale

I've had both Eaton and Auburn and prefer the Eaton. Eaton is rebuildable and hooks straighter.

Ditto, I would prefer to spend the few extra bucks to get the better unit. You will get a little clutch chatter accelerating through sharp corners without the L.S. additive, but it eases as the clutches break in.

I did break a set of Richmond street gears transbrake launching in the 3380 pound truck running low 12's, but have never had a seconds issue with the Richmond 9" Pro gear run in my low 9second Nova. I don't know if it's design or case flex but I have heard of more gears breaking in the GM 12bolt housing than the other popular differential cases (Dane & 9" ).

CreditGod · 10-21-2009, 01:43 AM

call peyton performance out of texas he builds rear ends for all of the big boys in the south he will shoot you straight

I have an auburn in mine.

hope this helps

10-07-2009, 08:00 AM	#1
chevyman8 Registered User Join Date: Feb 2008 Location: blanchard, ok Posts: 30	Need help picking a posi I picked up a 12 bolt rear the other day that I'm going to drop 3.73 gears into. I also want a posi, but I know what to get. My '84 is my daily driver that is also taken to the track. What's a good posi to drop in it? What are you guys runnin?

10-08-2009, 03:06 PM	#2
americanmusc1e Senior Member Join Date: Jan 2009 Location: Austin, TX Posts: 1,079	Re: Need help picking a posi I'm runnin' an open differential and in need of a posi (and gears) too......subscribed __________________ -- Josh Instagram: @americanmusc1e OLD SKOOL-- 1970 C10. 454/Th400/3.07 posi Build Thread FARM TRUCK----1949 Chevrolet 3800 Power Wagon Hauler Build Thread 1999 4wd OBS Tahoe - daily. DM me if you can't see photos i posted

10-08-2009, 07:05 PM	#4
AirMale Senior Member Join Date: Jan 2003 Location: Atlantic City, NJ Posts: 1,073	Re: Need help picking a posi I've had both Eaton and Auburn and prefer the Eaton. Eaton is rebuildable and hooks straighter. __________________ 86 SWB 9.0 LITER T-400-OD 4.11 eaton-4/5 drop Best 1/4 12.51 @112mph no traction

10-08-2009, 08:37 PM	#5
BossHogg69 motor exploder Join Date: Mar 2009 Location: Pittsburgh, PA Posts: 2,346	Re: Need help picking a posi I put an Auburn in my a DD '92 C1500 5.7/5 spd that I took to the track every now and then. I liked it because it was smooth and didn't make any noise. I had 3.73's, Lakewood traction bars and a 4" rear drop and it hooked pretty good. __________________ Adam 1969 Chevy CST/10 stepside, DART Big M/TREMEC Magnum Extreme/3.73's w/Detroit Truetrac 1965 Chevy Bel Air Wagon (daily driver), 327/TH350,10 bolt w/3.08's 1961 Chevy Bel Air Sport Coupe, ZZ454/M21/9" rear w/3.50's & Detroit Truetrac 2005 GMC 1500 ccsb 2wd, 6.0L/4L65e/3.73 G80 2006 GMC 2500HD ccsb 4x4, DMax LBZ/Allison 6spd/4.56's w/Detroit TrueTrac Use the SEARCH function on this forum - it is your friend!!

10-08-2009, 09:29 PM	#6
chevyman8 Registered User Join Date: Feb 2008 Location: blanchard, ok Posts: 30	Re: Need help picking a posi I appreciate the input. How about gears? I heard Richmonds whine and break a lot. I was told Motive gears are the way to go.

10-08-2009, 10:25 PM	#7
BossHogg69 motor exploder Join Date: Mar 2009 Location: Pittsburgh, PA Posts: 2,346	Re: Need help picking a posi i used Yukon gears in my '92 when I put in the Auburn. they were quiet too, and I never had any problems out of them either. I've never used Motive or Richmond. __________________ Adam 1969 Chevy CST/10 stepside, DART Big M/TREMEC Magnum Extreme/3.73's w/Detroit Truetrac 1965 Chevy Bel Air Wagon (daily driver), 327/TH350,10 bolt w/3.08's 1961 Chevy Bel Air Sport Coupe, ZZ454/M21/9" rear w/3.50's & Detroit Truetrac 2005 GMC 1500 ccsb 2wd, 6.0L/4L65e/3.73 G80 2006 GMC 2500HD ccsb 4x4, DMax LBZ/Allison 6spd/4.56's w/Detroit TrueTrac Use the SEARCH function on this forum - it is your friend!!

10-08-2009, 10:40 PM	#8
ProStreet71 Registered User Join Date: Sep 2008 Location: Huntingdon,TN Posts: 95	Re: Need help picking a posi If set up properly, gears should not whine regardless of manufacterer.

10-21-2009, 01:43 AM	#11
CreditGod Registered User Join Date: Dec 2008 Location: dallas, texas Posts: 90	Re: Need help picking a posi call peyton performance out of texas he builds rear ends for all of the big boys in the south he will shoot you straight I have an auburn in mine. hope this helps



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