Front Posi Axle. How to tell? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

JimmyFloyd · 05-09-2010, 11:10 AM

Ok, so I had a guy come buy the center link on my suburban, and he looked at the axle, and said it looked like it had a Posi tag on it. I am interested to know if there is a tag that denotes it as a posi, or if there is another way to tell? If I have to open it up, will it look the same as a rear posi carrier? It's a D44 axle, appears stock, but I know the rear appeared to have a gear change.

**too much stuff** · 05-09-2010, 11:53 AM

More than likely, the tag will tell you the gear ratio. See what the tag says for sure. Maybe you will get lucky and the tag will read "use posi lube only"

kev0519 · 05-09-2010, 03:43 PM

jack up one side with everything locked in see if there is resistance in turning wheel should be resistance [clutches in posi]

LONGHAIR · 05-09-2010, 08:01 PM

I don't think they ever did it from the factory....I would pull the cover and have a look. It could use some fresh lube anyway.

JimmyFloyd · 05-09-2010, 09:43 PM

Ok, got some pictures and the numbers off it. It appears that it might be a Posi

Here are the pictures:

Numbers read: 12 21 69 Dana 18520 A3d45 45-11

Numbers Read: 10 26 67 C 23181x

So, is this a Posi axle?

basemodel67 · 05-09-2010, 09:45 PM

I think front posi was an option... not sure that is factory, though.

JimmyFloyd · 05-09-2010, 10:15 PM

just trying to figure out if this is a posi or not. no need to know if it is factory cause it wasn't on the SPID

JimmyFloyd · 05-10-2010, 09:08 AM

Anyone know on this?

**bigsnookmaster** · 05-10-2010, 09:20 AM

Jack up the front without it being locked in. Turn a wheel, if the other wheel turns the same way, it's a posi. If it turns the other way, it isn't. That's the way I always tell. If it is a posi, you can have someone hold one wheel while you turn the other, to see how tight the unit is. I know on my 9" rear, it takes quite a bit of force to get the posi to slip. Good luck

JimmyFloyd · 05-10-2010, 09:25 AM

I would try that, but it's on a trailer and strapped down and sitting on an incline, so I can't really jack it up. I am hoping someone can tell by the pictures.

JimmyFloyd · 05-10-2010, 09:45 AM

Ok, little more research, and it seems like it is a POWR-LOK limited slip for a D44 as seen on this site:

http://www.shopih.com/POWRLOK-D44-p-AR.html

And here too (near the bottom):
http://www.vernco.com/powr-lok/

Time to figure out how to get it out.

RustyParts · 05-11-2010, 08:42 AM

According to the numbers on the ring gear it's a 4:10 ratio.

Rod · 05-16-2010, 11:21 PM

It's a posi, power-lok, has a clutch pack and it is rebuildable. Requires the posi-lube additive also.

**D.PASSMORE** · 05-18-2010, 04:13 PM

If so, the Old sub was set up for heavy four wheeel'in. DEEEP SNOOWW!!

JimmyFloyd · 05-18-2010, 04:18 PM

Yeah, it was from the central part of NY in the snow belt by Syracuse. I believe the truck was used for heavy long haul towing, as the rear had the gears replaced with 5.13's and the front was locked out with the transfer case. It also had cruise, trailer brakes, and an extra large fuel tank under the middle seat.

Good thing I didn't try and drive it as is, as I may have tried to put it into four wheel and had an issue.

**Dieselwrencher** · 05-18-2010, 04:53 PM

Yep, that's a Powr-lok. I had a 1970 K20 that had a lot of early 1969 parts on it from the factory, and it had the same set up in the front. I wish I would have kept that drivetrain now.

That truck would go almost anywhere.

05-09-2010, 11:10 AM	#1
JimmyFloyd Registered User Join Date: Apr 2009 Location: Rochester, NY Posts: 1,458	Front Posi Axle. How to tell? Ok, so I had a guy come buy the center link on my suburban, and he looked at the axle, and said it looked like it had a Posi tag on it. I am interested to know if there is a tag that denotes it as a posi, or if there is another way to tell? If I have to open it up, will it look the same as a rear posi carrier? It's a D44 axle, appears stock, but I know the rear appeared to have a gear change. __________________ 1970 Blazer 350/SM465/205 SOLD! \| 1998 Z3

05-09-2010, 11:53 AM	#2
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,790	Re: Front Posi Axle. How to tell? More than likely, the tag will tell you the gear ratio. See what the tag says for sure. Maybe you will get lucky and the tag will read "use posi lube only" __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

05-09-2010, 03:43 PM	#3
kev0519 Registered User Join Date: Feb 2007 Location: Goodview VA Posts: 27	Re: Front Posi Axle. How to tell? jack up one side with everything locked in see if there is resistance in turning wheel should be resistance [clutches in posi]

05-09-2010, 09:43 PM	#5
JimmyFloyd Registered User Join Date: Apr 2009 Location: Rochester, NY Posts: 1,458	Re: Front Posi Axle. How to tell? Ok, got some pictures and the numbers off it. It appears that it might be a Posi Here are the pictures: Numbers read: 12 21 69 Dana 18520 A3d45 45-11 Numbers Read: 10 26 67 C 23181x So, is this a Posi axle? __________________ 1970 Blazer 350/SM465/205 SOLD! \| 1998 Z3

05-09-2010, 09:45 PM	#6
basemodel67 Factory Strippers Rule! Join Date: Mar 2009 Location: Shingle Springs, CA Posts: 707	Re: Front Posi Axle. How to tell? I think front posi was an option... not sure that is factory, though. __________________ "Feast your eyes on a feast of smoke." 67 Chevy Short Fleet PLAN: LQ9, 4L60, D60 Looking for School Bus Gauges - Help me out!

05-09-2010, 10:15 PM	#7
JimmyFloyd Registered User Join Date: Apr 2009 Location: Rochester, NY Posts: 1,458	Re: Front Posi Axle. How to tell? just trying to figure out if this is a posi or not. no need to know if it is factory cause it wasn't on the SPID __________________ 1970 Blazer 350/SM465/205 SOLD! \| 1998 Z3

05-10-2010, 09:08 AM	#8
JimmyFloyd Registered User Join Date: Apr 2009 Location: Rochester, NY Posts: 1,458	Re: Front Posi Axle. How to tell? Anyone know on this? __________________ 1970 Blazer 350/SM465/205 SOLD! \| 1998 Z3

05-10-2010, 09:20 AM	#9
bigsnookmaster Senior Member Join Date: Jan 2008 Location: St.Petersburg,Fl Posts: 1,270	Re: Front Posi Axle. How to tell? Jack up the front without it being locked in. Turn a wheel, if the other wheel turns the same way, it's a posi. If it turns the other way, it isn't. That's the way I always tell. If it is a posi, you can have someone hold one wheel while you turn the other, to see how tight the unit is. I know on my 9" rear, it takes quite a bit of force to get the posi to slip. Good luck __________________ greg http://community.webshots.com/user/68406Stepside

05-10-2010, 09:25 AM	#10
JimmyFloyd Registered User Join Date: Apr 2009 Location: Rochester, NY Posts: 1,458	Re: Front Posi Axle. How to tell? I would try that, but it's on a trailer and strapped down and sitting on an incline, so I can't really jack it up. I am hoping someone can tell by the pictures. __________________ 1970 Blazer 350/SM465/205 SOLD! \| 1998 Z3

05-10-2010, 09:45 AM	#11
JimmyFloyd Registered User Join Date: Apr 2009 Location: Rochester, NY Posts: 1,458	Re: Front Posi Axle. How to tell? Ok, little more research, and it seems like it is a POWR-LOK limited slip for a D44 as seen on this site: http://www.shopih.com/POWRLOK-D44-p-AR.html And here too (near the bottom): http://www.vernco.com/powr-lok/ Time to figure out how to get it out. __________________ 1970 Blazer 350/SM465/205 SOLD! \| 1998 Z3 Last edited by JimmyFloyd; 05-10-2010 at 09:55 AM.

05-11-2010, 08:42 AM	#12
RustyParts Registered User Join Date: May 2006 Location: Wyman, Kentucky Posts: 403	Re: Front Posi Axle. How to tell? According to the numbers on the ring gear it's a 4:10 ratio. __________________ 1972 GMC Jimmy, 4WD, 454 CI, 350 Turbo, 4" lift, 35" tires The math teacher said my son "Bubba" could be a mathmatical genius. cause he's got 13 fingers!

05-16-2010, 11:21 PM	#13
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Re: Front Posi Axle. How to tell? It's a posi, power-lok, has a clutch pack and it is rebuildable. Requires the posi-lube additive also. __________________ 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. Last edited by Rod; 05-16-2010 at 11:23 PM.

05-18-2010, 04:13 PM	#14
D.PASSMORE One of the First Join Date: Jan 2000 Location: St. Augustine,FL. Posts: 4,059	Re: Front Posi Axle. How to tell? If so, the Old sub was set up for heavy four wheeel'in. DEEEP SNOOWW!!

05-18-2010, 04:18 PM	#15
JimmyFloyd Registered User Join Date: Apr 2009 Location: Rochester, NY Posts: 1,458	Re: Front Posi Axle. How to tell? Yeah, it was from the central part of NY in the snow belt by Syracuse. I believe the truck was used for heavy long haul towing, as the rear had the gears replaced with 5.13's and the front was locked out with the transfer case. It also had cruise, trailer brakes, and an extra large fuel tank under the middle seat. Good thing I didn't try and drive it as is, as I may have tried to put it into four wheel and had an issue. __________________ 1970 Blazer 350/SM465/205 SOLD! \| 1998 Z3

05-18-2010, 04:53 PM	#16
Dieselwrencher 6>8 Plugless........ Join Date: Sep 2007 Location: Prairie City, Ia Posts: 17,142	Re: Front Posi Axle. How to tell? Yep, that's a Powr-lok. I had a 1970 K20 that had a lot of early 1969 parts on it from the factory, and it had the same set up in the front. I wish I would have kept that drivetrain now. That truck would go almost anywhere. __________________ Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project *Tired of spark plugs? Check this out.* Last edited by Dieselwrencher; 05-18-2010 at 04:54 PM.



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