Recommendation for Posi unit? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chevydog66 · 03-29-2009, 10:33 PM

What kind of type of Posi unit are you guys using and what do you like or not like about them? I will be purchasing a limited slip differential unit for my stock 12 bolt truck rearend, while it is apart getting powdercoated. Anyone have a used unit that they want to sell? I want to keep my 3.07 gear. What's the spline count on the axle?

lowriden58 · 03-29-2009, 10:53 PM

Eaton all the way

i run one in my 71 and i believe the axles are 31splines? i went with a whole new setup, moser race axles, eaton posi etc. never had a problem on street or at track on slicks.

chevydog66 · 03-29-2009, 10:56 PM

I'm not seeing the Eaton listed for our 12 bolt trucks in the Summit catalog. I'm runnin and Eaton in my 66 Chevelle with no problems.

1LIME69 · 03-30-2009, 02:55 PM

Same here, running an 30 spline Eaton posi w/ moser axles and I haven't had one single issue. Got mine from rearendparts.com, $363.00. Cheapest I could find.

Ackattack · 03-30-2009, 04:26 PM

Another eaton here (actually I'm on my second one....the first was in my 72)

got mine from rearendparts.com too

prostreetC-10 · 03-30-2009, 05:50 PM

If you're hungry....you better get EATIN'......lol

lowriden58 · 03-30-2009, 06:10 PM

Part # from Summit is ETN-19556-010 it cost me 459.95 a year ago...

Ford Assassin · 03-30-2009, 09:05 PM

I haven't used one in my current '69 (yet), but I have used PowerTrax Lock-Right lockers in several other cars/truck I've owned with great results. They are a tad noisy making slow tight turns, but otherwise a great product for $300 and you don't even have to mess with the ring & pinion settings.

chevydog66 · 03-30-2009, 09:37 PM

Kewl, thanks guys!! I only have a 355ci sbc with a 200 4r trans. and 3.07 gear, so I don't need a rockcrusher unit.

1968SWBBigBlock · 03-30-2009, 10:04 PM

Eaton

kgt · 03-30-2009, 10:06 PM

powertrax....lives behind a 550 hp 468 ci and loves it...best of all 1 hour and its in...

03-29-2009, 10:33 PM	#1
chevydog66 GM ONLY BABY!!! Join Date: Oct 2003 Location: Fort Wayne, IN. Posts: 1,998	Recommendation for Posi unit? What kind of type of Posi unit are you guys using and what do you like or not like about them? I will be purchasing a limited slip differential unit for my stock 12 bolt truck rearend, while it is apart getting powdercoated. Anyone have a used unit that they want to sell? I want to keep my 3.07 gear. What's the spline count on the axle? __________________ 2 wrongs don't make a right, but 3 lefts do. 66 Chevelle Malibu 406ci, 573hp, 10.99@121mph 96 Chevy Silverado Z71 72 GMC 1500 Super Custom LS 6.0/4L65 on airride http://www.cardomain.com/ride/707879...mc-c-k-pick-up Last edited by chevydog66; 03-29-2009 at 10:35 PM.

03-29-2009, 10:53 PM	#2
lowriden58 Registered User Join Date: Jan 2008 Location: Chesapeake Beach, MD Posts: 812	Re: Recommendation for Posi unit? Eaton all the way i run one in my 71 and i believe the axles are 31splines? i went with a whole new setup, moser race axles, eaton posi etc. never had a problem on street or at track on slicks. __________________ 71 cheyenne lwb 300rwhp best 1/4 time so far 12.8 @103 http://i195.photobucket.com/albums/z...en58/001-2.jpg

03-29-2009, 10:56 PM	#3
chevydog66 GM ONLY BABY!!! Join Date: Oct 2003 Location: Fort Wayne, IN. Posts: 1,998	Re: Recommendation for Posi unit? I'm not seeing the Eaton listed for our 12 bolt trucks in the Summit catalog. I'm runnin and Eaton in my 66 Chevelle with no problems. __________________ 2 wrongs don't make a right, but 3 lefts do. 66 Chevelle Malibu 406ci, 573hp, 10.99@121mph 96 Chevy Silverado Z71 72 GMC 1500 Super Custom LS 6.0/4L65 on airride http://www.cardomain.com/ride/707879...mc-c-k-pick-up Last edited by chevydog66; 03-29-2009 at 10:57 PM.

03-30-2009, 02:55 PM	#4
1LIME69 Registered User Join Date: Nov 2006 Location: Alexis, NC Posts: 182	Re: Recommendation for Posi unit? Same here, running an 30 spline Eaton posi w/ moser axles and I haven't had one single issue. Got mine from rearendparts.com, $363.00. Cheapest I could find. __________________ "The Ultimate Sleeper" 69' SWB, Holley EFI 525 ci. BB, TH350, 3.73 Eaton posi/Moser axles, 1350 diveshaft, Vintec's 20"x8.5" and 20"x12", OPP windows, CPP rear coilover conversion

03-30-2009, 04:26 PM	#5
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,525	Re: Recommendation for Posi unit? Another eaton here (actually I'm on my second one....the first was in my 72) got mine from rearendparts.com too __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

03-30-2009, 05:50 PM	#6
prostreetC-10 My Carbon Footprint Join Date: Oct 2008 Location: Orygun Posts: 5,527	Re: Recommendation for Posi unit? If you're hungry....you better get EATIN'......lol __________________ A quick "pedalfest" *Still getting loose (carb test)* 496 Initial fire up video!

03-30-2009, 06:10 PM	#7
lowriden58 Registered User Join Date: Jan 2008 Location: Chesapeake Beach, MD Posts: 812	Re: Recommendation for Posi unit? Part # from Summit is ETN-19556-010 it cost me 459.95 a year ago... __________________ 71 cheyenne lwb 300rwhp best 1/4 time so far 12.8 @103 http://i195.photobucket.com/albums/z...en58/001-2.jpg

03-30-2009, 09:05 PM	#8
Ford Assassin Registered User Join Date: Jun 2008 Location: Jackson, Ca. Posts: 674	Re: Recommendation for Posi unit? I haven't used one in my current '69 (yet), but I have used PowerTrax Lock-Right lockers in several other cars/truck I've owned with great results. They are a tad noisy making slow tight turns, but otherwise a great product for $300 and you don't even have to mess with the ring & pinion settings. __________________ Cable -K5 Blazer 2wd: 6.0 LQ4, 7875 Turbo, Tick Stage II Turbo Cam, Built 4L80e, RevMax Billet 3600, 9.5" 14 Bolt -Chevy 3+3 Crew Cab Dually: Cummins 12v P-Pump Swap, Compound Turbos, A2W Intercooler, NV4500HD, 4wd conversion, Radius Arms, Coilovers, Crossover Steering, etc Build Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=803608

03-30-2009, 09:37 PM	#9
chevydog66 GM ONLY BABY!!! Join Date: Oct 2003 Location: Fort Wayne, IN. Posts: 1,998	Re: Recommendation for Posi unit? Kewl, thanks guys!! I only have a 355ci sbc with a 200 4r trans. and 3.07 gear, so I don't need a rockcrusher unit. __________________ 2 wrongs don't make a right, but 3 lefts do. 66 Chevelle Malibu 406ci, 573hp, 10.99@121mph 96 Chevy Silverado Z71 72 GMC 1500 Super Custom LS 6.0/4L65 on airride http://www.cardomain.com/ride/707879...mc-c-k-pick-up

03-30-2009, 10:04 PM	#10
1968SWBBigBlock Active Member Join Date: Oct 2006 Location: Ohio Posts: 1,643	Re: Recommendation for Posi unit? Eaton __________________ 1968 SWB 454 + .040, 490HP x 540 FT pounds of Torque 10-1 Kb Forged pistons, recon rods w/ ARP wave loc bolts 781 heads Ported with 2.19/1.88 SSTvalves Lunati 60204 cam, Micro Trol lifters, Ported Edelbrock Performer Rpm manifold armor coated, Pertronix Triple Strike Ignition Holley 770 Street Avenger carb,Headers armor coated Built by Watson Ruppel Performance in Sarahsville Ohio. Hardshift Tranny Built Turbo 350,TSI 10" 3000 stall 12 Bolt Eaton Posi 4.10 Richmond Gears moser axles 18.5" x 31" Hoosier Pro Street Radials ET Classic 5 Wheels - polished Power Steering, Power Brakes,Disc Brakes,Tach & Gauge Dash, Tilt,Factory Air (gone) Custom Paint & Body Work Special thanks to my wife, my son and my money tree

03-30-2009, 10:06 PM	#11
kgt Registered User Join Date: Jul 2008 Location: Vancouver Posts: 147	Re: Recommendation for Posi unit? powertrax....lives behind a 550 hp 468 ci and loves it...best of all 1 hour and its in...



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