whats a posi sound like? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**chev-obsession** · 07-13-2009, 04:30 PM

i had a posi unit put in my rear end and i drove it around to day and it sounded like chains binding. i thought that they made the tires chirp??? is this ok?

norske · 07-13-2009, 04:34 PM

Mine sounds like totally worn out brake shoes on the drum (metal on metal). I don't know if it's a problem or not. Tires do chirp if I hit it just a little turning a corner.

paps69 · 07-13-2009, 04:34 PM

What type of posi is it?

liftmeup · 07-13-2009, 05:22 PM

sounds like you will be putting in some extra hours to pay for a rebuild. unless its a locker it should be silent

**passthebuck** · 07-13-2009, 06:12 PM

It could be that the posi additive is worn out. It wears out over time & needs to be replaced. It's a lot cheaper than diving into a rearend rebuild that you might not need.

http://paceperformance.com/index.asp...D&ProdID=29478

turp mcspray · 07-13-2009, 07:49 PM

It should sound like squeeling in stereo.LOL!

cparman · 07-13-2009, 08:00 PM

If it is a stock type ( eaton I think ) they will have a set of clutches that can get glazed. Drain the rear end, and use a high quality 90w synthetic gear lube, and the GM positraction additive. I know that there are additives out there in the aftermarket, but GM's friction modifier is the best. After getting the truck back together find somewhere you can drive a very tight circle in one direction, and then in the other this will work the new fluids into the clutches in the rear end.

**special-K** · 07-13-2009, 09:27 PM

Hopefully changing fluid and additive will help.That won`t un-glaze the clutches.A posi makes no noise.

prostreetC-10 · 07-13-2009, 09:43 PM

Dang....give us more info on the install. Sounds like they didn't get it back together the way it came out. Shouldn't have any sound with regular driving.

**chev-obsession** · 07-14-2009, 12:29 PM

the guy that rebuilt it for me said it was good up to 80 foot lbs on his torque wrench, also it only does it a little bit when i take a corner real sharp, and in the gravel both tires will spin like they should.

**chev-obsession** · 07-14-2009, 12:30 PM

and yes it is a GM one

my67chevytruck · 07-14-2009, 12:43 PM

did he add the additive when it was rebuilt? also wondering if it was shimmed properly....

storm9c1 · 07-14-2009, 12:48 PM

+1 on the GM "limited slip" additive. Very important. Others brands have never worked for me on GM units. Without it, the rear will bind and pop or grind on turns.

07-13-2009, 04:30 PM	#1
chev-obsession Senior Member Join Date: Jul 2008 Location: kennewick, WA Posts: 1,504	whats a posi sound like? i had a posi unit put in my rear end and i drove it around to day and it sounded like chains binding. i thought that they made the tires chirp??? is this ok? __________________ 1965 c/10 swb 1969 c/10 lwb

07-13-2009, 04:34 PM	#2
norske Registered User Join Date: Dec 2008 Location: Austin, MN Posts: 117	Re: whats a posi sound like? Mine sounds like totally worn out brake shoes on the drum (metal on metal). I don't know if it's a problem or not. Tires do chirp if I hit it just a little turning a corner.

07-13-2009, 04:34 PM	#3
paps69 Registered User Join Date: Oct 2006 Location: Guston, Ky Posts: 79	Re: whats a posi sound like? What type of posi is it? __________________ IF A FELLA DOESN'T USE HIS HEAD....... HE MIGHT AS WELL HAVE TWO BUTTS 1969 C10 LWB "Granpaps Truck" (Project) 2000 K3500 Crew Cab LWB (Farm Truck) 2007 Chevy 1500 Crew Cab 5.3 (Daily Driver)

07-13-2009, 05:22 PM	#4
liftmeup Registered User Join Date: Jan 2009 Location: Pittsburg PA Posts: 246	Re: whats a posi sound like? sounds like you will be putting in some extra hours to pay for a rebuild. unless its a locker it should be silent

07-13-2009, 06:12 PM	#5
passthebuck Sisyphus was my mentor! Join Date: Sep 2002 Location: Carleton Place, Ontario CANADA Posts: 984	Re: whats a posi sound like? It could be that the posi additive is worn out. It wears out over time & needs to be replaced. It's a lot cheaper than diving into a rearend rebuild that you might not need. http://paceperformance.com/index.asp...D&ProdID=29478 __________________ passthebuck #5642 -TWO 1967 GMC 910's. One with L6/3-on-the tree and the other with 355 w/435hp & a 700r4. -a 2013 Honda Civic as my "sensible" car

07-13-2009, 07:49 PM	#6
turp mcspray Registered User Join Date: May 2007 Location: Rapid City South Dakota Posts: 2,359	Re: whats a posi sound like? It should sound like squeeling in stereo.LOL! __________________ Turp Mcspray New life for an old 2wd, farm blazer http://67-72chevytrucks.com/vboard/s...d.php?t=505987 My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=342299

07-13-2009, 08:00 PM	#7
cparman sharp as a marble Join Date: Jan 2007 Location: atlantic beach,florida Posts: 1,082	Re: whats a posi sound like? If it is a stock type ( eaton I think ) they will have a set of clutches that can get glazed. Drain the rear end, and use a high quality 90w synthetic gear lube, and the GM positraction additive. I know that there are additives out there in the aftermarket, but GM's friction modifier is the best. After getting the truck back together find somewhere you can drive a very tight circle in one direction, and then in the other this will work the new fluids into the clutches in the rear end.

07-13-2009, 09:27 PM	#8
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,861	Re: whats a posi sound like? Hopefully changing fluid and additive will help.That won`t un-glaze the clutches.A posi makes no noise. __________________ "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 ~

07-13-2009, 09:43 PM	#9
prostreetC-10 My Carbon Footprint Join Date: Oct 2008 Location: Orygun Posts: 5,527	Re: whats a posi sound like? Dang....give us more info on the install. Sounds like they didn't get it back together the way it came out. Shouldn't have any sound with regular driving. __________________ A quick "pedalfest" *Still getting loose (carb test)* 496 Initial fire up video!

07-14-2009, 12:29 PM	#10
chev-obsession Senior Member Join Date: Jul 2008 Location: kennewick, WA Posts: 1,504	Re: whats a posi sound like? the guy that rebuilt it for me said it was good up to 80 foot lbs on his torque wrench, also it only does it a little bit when i take a corner real sharp, and in the gravel both tires will spin like they should. __________________ 1965 c/10 swb 1969 c/10 lwb

07-14-2009, 12:30 PM	#11
chev-obsession Senior Member Join Date: Jul 2008 Location: kennewick, WA Posts: 1,504	Re: whats a posi sound like? and yes it is a GM one __________________ 1965 c/10 swb 1969 c/10 lwb

07-14-2009, 12:43 PM	#12
my67chevytruck Under Construction Join Date: Oct 2007 Location: Midlothian,TX (DFW) Posts: 4,555	Re: whats a posi sound like? did he add the additive when it was rebuilt? also wondering if it was shimmed properly.... __________________ Heath subscribe to the board here: http://67-72chevytrucks.com/vboard/payments.php http://67-72chevytrucks.com/vboard/s...d.php?t=157669 FAQ how to's 1956 Chevy Apache 1967 C10 SWB FleetSide (under construction) 1969 K10 SWB FleetSide (Future Build) 1972 C10 SWB Stepside (Future Build) 56 chevy truck : http://www.cardomain.com/ride/2955823/1 67 truck build: http://www.67-72chevytrucks.com/vboard/showthread.php?t=281357/1 69 k10: http://67-72chevytrucks.com/vboard/s...d.php?t=389470 Last edited by my67chevytruck; 07-14-2009 at 12:44 PM.

07-14-2009, 12:48 PM	#13
storm9c1 * That's interesting * Join Date: Oct 2008 Location: Pittsburgh, PA Posts: 2,772	Re: whats a posi sound like? +1 on the GM "limited slip" additive. Very important. Others brands have never worked for me on GM units. Without it, the rear will bind and pop or grind on turns. __________________ Tom Chevy by day... 1969 Chevy C30 Rollback Tow Truck -- 383 stroker, 4L80E 2011 Chevy Caprice PPV 9C3 6.0L 1995 Chevy Caprice 9C1 1994 Chevy Caprice 9C1 #3 1995 Chevy Caprice Wagon #2 1995 Chevy Impala SS Mopar by night... 1969 Dodge Charger 1972 Chrysler Newport 2dr Hardtop (27K miles) Plus others...



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