Dana 60's power lok vs maximum traction - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Rod · 10-13-2002, 09:27 PM

Seems that the dana 60 came with either a power lok or a maximum traction option availability. What's the option number for maximum traction in a 3/4 ton...G80? Who has more info on a power lok...looking for more info. Maximum traction has spring kit and clutches.

**JIMs70GMC** · 10-13-2002, 10:45 PM

My 70 has the max traction option listed, and I've identified it as a spicer powr-loc. I obtained a service manual from drivetraindirect for a dana 60/70 powr-loc. I don't believe there was two different traction aids available in the dana60. Of course the 10/12 bolts came with a type, and the eaton ones had detroit lockers also called no-spin. Hope this helps. I'm at work I'll be able to check the glove box door around 0030 for the RPO code.

Rod · 10-13-2002, 10:57 PM

Well I have a dana 60 from a 71 GMC 3/4 ton that has a clutch pack posi ... and I think it said maximum traction on the id sticker when I got that one. I have a power lok from a 71 3/4 Chev this past weekend, option G87 I saved the sticker from that glove box... and have a couple detroit lockers ( no-spin ) from eaton - corporation rear ends option G86. I cant remeber what maximum traction was and are they just clutch pack posi's in 3/4 tons. My GM overhaul manuals have decent exploded pic of power lok but does not show a 3/4 ton clutch pack posi. Parts books dont list a maximum traction option number either.

**JIMs70GMC** · 10-14-2002, 01:20 AM

Just checked mine G87 -max. traction R axle. It's the powr-loc w/clutches. In my signature, under My 70 GMC, I have scanned in the powr-loc manual.

Rod · 10-14-2002, 07:40 PM

Hmm interesting and good scan pics there ... Thanks. Anyone else have a different type posi in their 3/4 ton truck.... I still have one that looks like a 1/2 ton one with the spring kit and clutch packs. Anyone have one like that.

roger0080 · 10-14-2002, 09:19 PM

Let's see here...

From the GM Parts Book:
G80 Rear Axle - Positraction
G86 Rear Axle - No Spin
G87 Rear Axle - Power Lock

G80 is for the 1/2 Tons.
G86 for the Eaton 3rd member...
G87 is for the Dana 60's

The Chevrolet Overhaul manual says that there are four optional Positraction differential units: Chevrolet (8 1/2" Ring Gears), Eaton (car & truck), Borg Warner (probably cars) and Dana PowerLok. Also says that No Spin was optionally in stalled in 5200 or 7200 lb. axle housings. Only thing it says about the Borg Warner is that when it wears out it must be replaced with either a Chev or and Eaton Positraction Diff unit.

If it isn't the No Spin you must have the PowerLok. Check the Overhaul manual, it has exploded pics of the Eaton Posi, Chevrolet Posi, PowerLok, and the NoSpin.

-Roger

mikep · 10-14-2002, 09:32 PM

I have a detroit locker in my Dana 60 and its the 2nd Dana 60 with a detroit locker differential I have owned. The first being out of a 69 Charger. This locker unit itself is date coded 1962 . Had no idea they made them that far back. I have no idea what it came out of but its a 30 spline unit and was in a 8 lug rear end sitting in a pile in the junkyard. Iv'e used clutch type and lockers in 9 inch ford and dana 60's and to thell you the truth I prefer clutch type. I cant hear this one engage and disengage but I can feel a bit of clicking around very tight corners or when doing U turns. It grabs like a son of a ***** though !

Rod · 10-14-2002, 09:41 PM

Yep... that info I knew... still is there any spring pack posi's that look like the 1/2 ton posi's in anyones 3/4 ton?

mikep · 10-14-2002, 09:51 PM

Oh I get it . Your'e asking if Dana's or Eatons came with GM style coil spring posi's. Dana's have springs but theyr'e bellville type not coil type. Since the only thing that 3/4 tons came with were Dana 60's and Eatons the answer would have to be no. Remember that Dana and Eaton were outside contracters with their own systems. Later 14 bolt GM corporate positraction may have been the same. Never had one apart.

williso · 10-15-2002, 11:29 AM

Here's a page from Dana's own publication # x510-8 dsd which covers their axles from 1967-78. However, if you read the various charts in the book, ONLY the Powr-Loc was available on Chev C20/GMC 2500 for the 67-72 period. The Trac-Loc was used on vans in 74 and later.

teeitup · 02-26-2011, 11:10 PM

Here ya go Ernesto. THANKS to Chipflyer for finding it for us. Randy

otsenre · 02-26-2011, 11:32 PM

Thanks to Randy and Chipflyer for finding this thread. I have a maxi tract r axle on a 68 3/4 ton pickup I am parting out and have never heard of this differential before, again muchas gracias, Randy and Chipflyer

10-13-2002, 09:27 PM	#1
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Dana 60's power lok vs maximum traction Seems that the dana 60 came with either a power lok or a maximum traction option availability. What's the option number for maximum traction in a 3/4 ton...G80? Who has more info on a power lok...looking for more info. Maximum traction has spring kit and clutches. __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

10-13-2002, 10:45 PM	#2
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	My 70 has the max traction option listed, and I've identified it as a spicer powr-loc. I obtained a service manual from drivetraindirect for a dana 60/70 powr-loc. I don't believe there was two different traction aids available in the dana60. Of course the 10/12 bolts came with a type, and the eaton ones had detroit lockers also called no-spin. Hope this helps. I'm at work I'll be able to check the glove box door around 0030 for the RPO code. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

10-13-2002, 10:57 PM	#3
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Well I have a dana 60 from a 71 GMC 3/4 ton that has a clutch pack posi ... and I think it said maximum traction on the id sticker when I got that one. I have a power lok from a 71 3/4 Chev this past weekend, option G87 I saved the sticker from that glove box... and have a couple detroit lockers ( no-spin ) from eaton - corporation rear ends option G86. I cant remeber what maximum traction was and are they just clutch pack posi's in 3/4 tons. My GM overhaul manuals have decent exploded pic of power lok but does not show a 3/4 ton clutch pack posi. Parts books dont list a maximum traction option number either. __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

10-14-2002, 01:20 AM	#4
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Just checked mine G87 -max. traction R axle. It's the powr-loc w/clutches. In my signature, under My 70 GMC, I have scanned in the powr-loc manual. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

10-14-2002, 07:40 PM	#5
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Hmm interesting and good scan pics there ... Thanks. Anyone else have a different type posi in their 3/4 ton truck.... I still have one that looks like a 1/2 ton one with the spring kit and clutch packs. Anyone have one like that. __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

10-14-2002, 09:19 PM	#6
roger0080 Registered User Join Date: Nov 2000 Location: Carver County, Minnesota, USA Posts: 626	Let's see here... From the GM Parts Book: G80 Rear Axle - Positraction G86 Rear Axle - No Spin G87 Rear Axle - Power Lock G80 is for the 1/2 Tons. G86 for the Eaton 3rd member... G87 is for the Dana 60's The Chevrolet Overhaul manual says that there are four optional Positraction differential units: Chevrolet (8 1/2" Ring Gears), Eaton (car & truck), Borg Warner (probably cars) and Dana PowerLok. Also says that No Spin was optionally in stalled in 5200 or 7200 lb. axle housings. Only thing it says about the Borg Warner is that when it wears out it must be replaced with either a Chev or and Eaton Positraction Diff unit. If it isn't the No Spin you must have the PowerLok. Check the Overhaul manual, it has exploded pics of the Eaton Posi, Chevrolet Posi, PowerLok, and the NoSpin. -Roger __________________ 72 Chev C-10 90% restored (former AZ truck) ... 71 Chev K-20 Cheyenne my vacation crusier... 72 Chev C-10 Now retired and striped after many faithful miles... 72 GMC 1500 Retired to the junk yard after bought new in '71...

10-14-2002, 09:32 PM	#7
mikep Used to have a truck Join Date: May 2002 Location: port orchard WA Posts: 1,552	I have a detroit locker in my Dana 60 and its the 2nd Dana 60 with a detroit locker differential I have owned. The first being out of a 69 Charger. This locker unit itself is date coded 1962 . Had no idea they made them that far back. I have no idea what it came out of but its a 30 spline unit and was in a 8 lug rear end sitting in a pile in the junkyard. Iv'e used clutch type and lockers in 9 inch ford and dana 60's and to thell you the truth I prefer clutch type. I cant hear this one engage and disengage but I can feel a bit of clicking around very tight corners or when doing U turns. It grabs like a son of a ***** though ! __________________ No truck :-(

10-14-2002, 09:41 PM	#8
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Yep... that info I knew... still is there any spring pack posi's that look like the 1/2 ton posi's in anyones 3/4 ton? __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

10-14-2002, 09:51 PM	#9
mikep Used to have a truck Join Date: May 2002 Location: port orchard WA Posts: 1,552	Oh I get it . Your'e asking if Dana's or Eatons came with GM style coil spring posi's. Dana's have springs but theyr'e bellville type not coil type. Since the only thing that 3/4 tons came with were Dana 60's and Eatons the answer would have to be no. Remember that Dana and Eaton were outside contracters with their own systems. Later 14 bolt GM corporate positraction may have been the same. Never had one apart. __________________ No truck :-( Last edited by mikep; 10-14-2002 at 10:21 PM.

10-15-2002, 11:29 AM	#10
williso Registered User Join Date: Jan 2000 Location: Manheim PA USA Posts: 80	Here's a page from Dana's own publication # x510-8 dsd which covers their axles from 1967-78. However, if you read the various charts in the book, ONLY the Powr-Loc was available on Chev C20/GMC 2500 for the 67-72 period. The Trac-Loc was used on vans in 74 and later. Attached Images

02-26-2011, 11:10 PM	#11
teeitup Just like to part out trucks!! Join Date: Nov 2001 Location: Meriden, Ks-North of Topeka 10 miles Posts: 27,396	Re: Dana 60's power lok vs maximum traction Here ya go Ernesto. THANKS to Chipflyer for finding it for us. Randy __________________ 67 Chev swb stepside 4x4 283 4 speed SOLD 72 blazer 4x4 4 speed Cheyenne 72 GMC swb 4x4 fleet 4 speed, original paint 1958 Cameo (one of 1405 built, it was my dads) 2020 chevy Apex 4x4 crew cab 1969 Z28 with the 302 1980 chevy swb 4x4 1964 chevell Malibu SS 1976 K20, sold new originally out of my dads chevy dealership Members that I've met, over 200 probably closer to 300 in the 12 years I've been on this site, everyone I met "It was a pleasure"

02-26-2011, 11:32 PM	#12
otsenre Registered User Join Date: Feb 2007 Location: Colorado Springs, Co Posts: 1,939	Re: Dana 60's power lok vs maximum traction Thanks to Randy and Chipflyer for finding this thread. I have a maxi tract r axle on a 68 3/4 ton pickup I am parting out and have never heard of this differential before, again muchas gracias, Randy and Chipflyer



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