posi front axle? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**k5blazin** · 04-27-2010, 07:27 PM

picked up a 71 k5 for parts! the options list front and rear positraction axles! is this common? also was there ever a factory gm snow plow? the reason i ask this is because there are a few decals stating plowing precautions that look GM!! thanks

Jtrux · 04-27-2010, 11:46 PM

I've only heard of one other having it so I would think it's not common. My Ford F150 has front and rear limited slips and it's pretty uncommon in Fords too. Looks like it could be fixed up. Oh and the plow could of maybe been dealer added.

JimmyFloyd · 04-28-2010, 12:03 PM

If you aren't using some parts from it, I might be interested in what is left, and you aren't too far from me. Let me know.

budster · 05-05-2010, 10:59 PM

My 72 Blazer has front and rear posi, it was just a special order thingy.

Critter · 05-05-2010, 11:20 PM

Is that top yellow or am I seeing things?

**k5blazin** · 05-07-2010, 09:27 PM

yes its john deere yellow!! painted by the original owner years ago... its a double wall factory color was black!

**k5blazin** · 05-07-2010, 09:32 PM

Quote:

Originally Posted by k5blazin

yes its john deere yellow!! painted by the original owner years ago... its a double wall factory color was black!

took the body off this past weekend!

JimmyFloyd · 05-10-2010, 09:25 AM

what'd you do with the body?

**k5blazin** · 05-10-2010, 10:00 PM

stripped what i needed and set it aside! what are you looking for?

**special-K** · 05-10-2010, 10:27 PM

I had a Custom Camper/10 with front and rear posi.It`s a rare option to find.

115-K10 · 09-11-2011, 09:41 AM

Quote:

Originally Posted by k5blazin

took the body off this past weekend!

Hi, I know this is an old post but do you still have the plow setup and if so do you want to sell it?

Thanks,
Jeff
Posted via Mobile Device

**k5blazin** · 09-12-2011, 08:14 PM

Posted via Mobile Device

**k5blazin** · 09-12-2011, 08:15 PM

Sorry plow set up is gone!
Posted via Mobile Device

viking427 · 09-14-2011, 05:29 PM

Not to put an old thread on life support, but a quick question on the front Positraction option (I think I know the answer);

Does this mean the standard 69-72 4WD Blazer front differential carrier is actually an open unit ..meaning only one of the front locking hubs (front left I assume) is operational and the other locking hub is just for looks and useless ?

If so, I guess the base model 4wd is actually just a "2WD", unless it came with the rear posi option, in which case it would be 3WD ..unless it also came with front posi option, making it a true "4WD"

And how do open front and rear diff. carriers behave in reverse, I assume the same as forward (same wheel spinning, only backward).

..guess I haven't expiremented enough.

69TowRig · 10-10-2011, 10:56 PM

Quote:

Originally Posted by viking427

Does this mean the standard 69-72 4WD Blazer front differential carrier is actually an open unit ..meaning only one of the front locking hubs (front left I assume) is operational and the other locking hub is just for looks and useless ?

Both hubs are functional. Both have shafts running to the differential. As long as both tires have traction then both tires get torque from the driveline. When one tire or the other hits a slick surface (or is lifted off the ground) then the open differential will drive that side. The purpose, of course, is to allow for speed variation between the wheels while driving on a surface with sufficient traction. In a turn the outside wheel travels a longer arc than the inside wheel so the differential allows the outside wheel to spin faster than the inside wheel. Unfortunately this also means in low-traction situations that it will push engine torque to whichever wheel has the least traction.

Yes, stock carrier is open, and the Posi units are a bit rare.

04-27-2010, 07:27 PM	#1
k5blazin Senior Member Join Date: Oct 2009 Location: potsdam ny Posts: 401	posi front axle? picked up a 71 k5 for parts! the options list front and rear positraction axles! is this common? also was there ever a factory gm snow plow? the reason i ask this is because there are a few decals stating plowing precautions that look GM!! thanks Attached Images

04-27-2010, 11:46 PM	#2
Jtrux I'm a poor spectator Join Date: Aug 2006 Location: San Antonio, Tx Posts: 2,287	Re: posi front axle? I've only heard of one other having it so I would think it's not common. My Ford F150 has front and rear limited slips and it's pretty uncommon in Fords too. Looks like it could be fixed up. Oh and the plow could of maybe been dealer added. __________________ 2006 Jeep Unlimited IMPACT ORANGE 1993 Chevy 2500 4x4 ExCab LWB 454/NV4500 Tow rig 1977 Ford F100 2x4 LWB 1st truck I owned, still have it!!! 1979 Ford F150 4x4 SWB Built Ford Tough!!! 1971 Chevy Blazer 350 / SM465 / NP205 UNDER CONSTRUCTION Soon to have a LQ4 6.0!!!

04-28-2010, 12:03 PM	#3
JimmyFloyd Registered User Join Date: Apr 2009 Location: Rochester, NY Posts: 1,458	Re: posi front axle? If you aren't using some parts from it, I might be interested in what is left, and you aren't too far from me. Let me know. __________________ 1970 Blazer 350/SM465/205 SOLD! \| 1998 Z3

05-05-2010, 10:59 PM	#4
budster Registered User Join Date: Jun 2009 Location: Morton, WA Posts: 51	Re: posi front axle? My 72 Blazer has front and rear posi, it was just a special order thingy.

05-05-2010, 11:20 PM	#5
Critter Future TOTM Winner Join Date: Aug 2006 Location: Bulverde, TX Posts: 2,692	Re: posi front axle? Is that top yellow or am I seeing things? __________________ 72 Chevy CST K5 HIGHLANDER BLAZER Getting a 6.0,NV4500,NP205,14BFF (Currently laying all over the place in little pieces) 72 Chevy swb step-side "LS" 6.0 Here's a build thread of sorts 2002 HD2500 Crew Cab, 8.1L Allison 4x4 Daily Driver Check it out www.lsdyno.com

05-07-2010, 09:27 PM	#6
k5blazin Senior Member Join Date: Oct 2009 Location: potsdam ny Posts: 401	Re: posi front axle? yes its john deere yellow!! painted by the original owner years ago... its a double wall factory color was black!

05-10-2010, 09:25 AM	#8
JimmyFloyd Registered User Join Date: Apr 2009 Location: Rochester, NY Posts: 1,458	Re: posi front axle? what'd you do with the body? __________________ 1970 Blazer 350/SM465/205 SOLD! \| 1998 Z3

05-10-2010, 10:00 PM	#9
k5blazin Senior Member Join Date: Oct 2009 Location: potsdam ny Posts: 401	Re: posi front axle? stripped what i needed and set it aside! what are you looking for?

05-10-2010, 10:27 PM	#10
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,861	Re: posi front axle? I had a Custom Camper/10 with front and rear posi.It`s a rare option to find. __________________ "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 ~

09-12-2011, 08:14 PM	#12
k5blazin Senior Member Join Date: Oct 2009 Location: potsdam ny Posts: 401	Re: posi front axle? Posted via Mobile Device

09-12-2011, 08:15 PM	#13
k5blazin Senior Member Join Date: Oct 2009 Location: potsdam ny Posts: 401	Re: posi front axle? Sorry plow set up is gone! Posted via Mobile Device

09-14-2011, 05:29 PM	#14
viking427 Registered User Join Date: Aug 2011 Location: Dallas TX Posts: 225	Re: posi front axle? Not to put an old thread on life support, but a quick question on the front Positraction option (I think I know the answer); Does this mean the standard 69-72 4WD Blazer front differential carrier is actually an open unit ..meaning only one of the front locking hubs (front left I assume) is operational and the other locking hub is just for looks and useless ? If so, I guess the base model 4wd is actually just a "2WD", unless it came with the rear posi option, in which case it would be 3WD ..unless it also came with front posi option, making it a true "4WD" And how do open front and rear diff. carriers behave in reverse, I assume the same as forward (same wheel spinning, only backward). ..guess I haven't expiremented enough.



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