Posi unit for Eaton HO52 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Ed Capper · 05-16-2018, 02:30 PM

Does anyone know where to find a posi differential for Eaton 52? Had no problem finding one for the Dana 44 in the front but having no luck with the rear.

**special-K** · 05-16-2018, 08:59 PM

I only know of Detroit Lockers for the corporate rears. That's what they came with, that GM called "No-Spin". You won't find a new unit offered these days, but used units can be found or one for a 14-bolt will work with 14-bolt axles...with a little taken off the 14-bolt axle length

BCOWANWHEELS · 05-17-2018, 12:19 AM

Update to modern 14 bolt

Killer Bee · 05-17-2018, 12:36 AM

HO52 Detroit lockers [GM no-spin] are made out of unobtanium

goodly amount of forum discussions out there, may have to do a little research for an alternative unless you can wait for a falling star..

I bought a D60 I was preparing for a swap in my K20 Burb but a friend pulled through with a complete HO52 third member with locker for me.. thankfully before any cutting took place..

good luck!

**special-K** · 05-17-2018, 06:16 AM

Quote:

Originally Posted by BCOWANWHEELS

Update to modern 14 bolt

That, or keep it original with 14-bolt guts. Axle swaps are always an option. My '72 K2500 came with a Dana60 with Power Lok posi. But the HO52 is a tougher axle, so I have one of those with No Spin as a swap option. Because all of these rears, even the 14-bolt, are old parts with the possibility of losing parts support.

Ed Capper · 05-17-2018, 06:12 PM

What's involved in converting to 14 bolt axles?

**jocko** · 05-17-2018, 06:26 PM

Good info from member jbclassix here http://67-72chevytrucks.com/vboard/s...d.php?t=536119

52napco · 05-17-2018, 07:32 PM

I've got a couple of no spins if u need one

BCOWANWHEELS · 05-17-2018, 07:35 PM

Detroit lockers are very hard on fuel milage and tires, you want something with clutch packs.

**special-K** · 05-18-2018, 06:46 AM

I beg to differ on that, sorry. After running these in many trucks over the years I have never found either to be true. Mileage is not affected by a locker. They present no more rolling resistance that an open rear. I've owned two '72 3/4t pickups that got identical mileage. Both had everything the same except the GMC had a Power-Loc and the Chevy had a No-Spin and they both got 12.5 mpg.

On rear tires wearing, you just need to know how to drive a locker. You drift it around the sharp turns, unless you like to hear the tell tale chirp and wear on your tires. I've driven trucks with lockers so much, that is how I always make my turns. At a light making a left, for instance, I give gas to get going, cut left, roll around the bend, then hit the throttle. It's a good way to drive anything to prevent fishtailing on greasy rainy streets, even with open rear. Tires on an open rear will wear less driving this way as well.

Killer Bee · 05-18-2018, 10:53 AM

You Tube

BCOWANWHEELS · 05-18-2018, 01:02 PM

now tell how they ratchet

05-16-2018, 02:30 PM	#1
Ed Capper Registered User Join Date: Apr 2018 Location: Birdsboro, PA Posts: 8	Posi unit for Eaton HO52 Does anyone know where to find a posi differential for Eaton 52? Had no problem finding one for the Dana 44 in the front but having no luck with the rear.

05-16-2018, 08:59 PM	#2
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Posi unit for Eaton HO52 I only know of Detroit Lockers for the corporate rears. That's what they came with, that GM called "No-Spin". You won't find a new unit offered these days, but used units can be found or one for a 14-bolt will work with 14-bolt axles...with a little taken off the 14-bolt axle length __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

05-17-2018, 12:19 AM	#3
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	Re: Posi unit for Eaton HO52 Update to modern 14 bolt __________________ I BELIEVE IN JOHN 3:16

05-17-2018, 12:36 AM	#4
Killer Bee Registered User Join Date: Jan 2016 Location: Barber City, CA Posts: 4,809	Re: Posi unit for Eaton HO52 HO52 Detroit lockers [GM no-spin] are made out of unobtanium goodly amount of forum discussions out there, may have to do a little research for an alternative unless you can wait for a falling star.. I bought a D60 I was preparing for a swap in my K20 Burb but a friend pulled through with a complete HO52 third member with locker for me.. thankfully before any cutting took place.. good luck! __________________ *I started out with nothing - and I still have most of it*

05-17-2018, 06:12 PM	#6
Ed Capper Registered User Join Date: Apr 2018 Location: Birdsboro, PA Posts: 8	Re: Posi unit for Eaton HO52 What's involved in converting to 14 bolt axles?

05-17-2018, 06:26 PM	#7
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,975	Re: Posi unit for Eaton HO52 Good info from member jbclassix here http://67-72chevytrucks.com/vboard/s...d.php?t=536119

05-17-2018, 07:32 PM	#8
52napco Registered User Join Date: Jun 2014 Location: upstate sc Posts: 2,095	Re: Posi unit for Eaton HO52 I've got a couple of no spins if u need one

05-17-2018, 07:35 PM	#9
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	Re: Posi unit for Eaton HO52 Detroit lockers are very hard on fuel milage and tires, you want something with clutch packs. __________________ I BELIEVE IN JOHN 3:16

05-18-2018, 06:46 AM	#10
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Posi unit for Eaton HO52 I beg to differ on that, sorry. After running these in many trucks over the years I have never found either to be true. Mileage is not affected by a locker. They present no more rolling resistance that an open rear. I've owned two '72 3/4t pickups that got identical mileage. Both had everything the same except the GMC had a Power-Loc and the Chevy had a No-Spin and they both got 12.5 mpg. On rear tires wearing, you just need to know how to drive a locker. You drift it around the sharp turns, unless you like to hear the tell tale chirp and wear on your tires. I've driven trucks with lockers so much, that is how I always make my turns. At a light making a left, for instance, I give gas to get going, cut left, roll around the bend, then hit the throttle. It's a good way to drive anything to prevent fishtailing on greasy rainy streets, even with open rear. Tires on an open rear will wear less driving this way as well. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

05-18-2018, 01:02 PM	#12
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	Re: Posi unit for Eaton HO52 now tell how they ratchet __________________ I BELIEVE IN JOHN 3:16

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