Do I have a posi? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jmil1974 · 09-23-2002, 03:17 PM

I am taking my drums off the back and I spun the axle and both axles turned. Does this mean 100% for sure that I have a posi?

Thanks!
Jason

Gene · 09-23-2002, 03:27 PM

No but what better excuse to change that differential oil than to check and see if you have a posi-trac...If you see a bunch of springs and clutches in there you got one! If you just see gears you aint got one..

Michael A. K. G · 09-23-2002, 03:27 PM

No. It may mean that the turning resistance for the rear driveshaft is less than that for the far axle shaft. But it's likely you do.

Put one rear wheel on the ground, and the transmission (or transfer case, if you have one) in neutral. Then turn the off-the-ground wheel by hand. If you can't, you have a functioning Posi. If you can, you have either an open diff or a worn out Posi. You can't tell an open diff from a worn out Posi without removing the diff cover and inspecting the diff.

Note that if you have a 4x4, you have to either put the transfer case in neutral or raise the FRONT wheels, too.

67 C-10 LWB · 09-23-2002, 03:27 PM

not 100% for sure
if you spin them and they both go the same direction then you very well could have a posi
but if you spin them and they turn opposite ways you either have an open rear, or a worn out posi
hope this helps...

I heard the only sure way to know is to pull the cover

Ean

jmil1974 · 09-23-2002, 07:08 PM

Thanks, guys!!

09-23-2002, 03:17 PM	#1
jmil1974 Ain't we cute? Join Date: May 2002 Location: Friendswood, TX Posts: 700	Do I have a posi? I am taking my drums off the back and I spun the axle and both axles turned. Does this mean 100% for sure that I have a posi? Thanks! Jason __________________ 69 C10 2WD LWB Fleet 350/350 power front disc conversion (6 lug disc kit from gmcpauls) and new engine, PS, A/C, fresh fluids, SHE DRIVES! FOR SALE $3900

09-23-2002, 03:27 PM	#2
Gene Registered User Join Date: Aug 2002 Location: Muskogee, Oklahoma Posts: 2,914	No but what better excuse to change that differential oil than to check and see if you have a posi-trac...If you see a bunch of springs and clutches in there you got one! If you just see gears you aint got one.. __________________ 1971 SWB 4X4 Build BOARD MEMBER #5448 BOOMER SOONER!!!!

09-23-2002, 03:27 PM	#4
67 C-10 LWB Registered User Join Date: Nov 2000 Location: Bay City, MI, USA Posts: 452	not 100% for sure if you spin them and they both go the same direction then you very well could have a posi but if you spin them and they turn opposite ways you either have an open rear, or a worn out posi hope this helps... I heard the only sure way to know is to pull the cover Ean __________________ 1999 Silverado Ext Cab Short Box Z71 2006 Trailblazer (wifes) 2 '04 KFX400's My Site

09-23-2002, 07:08 PM	#5
jmil1974 Ain't we cute? Join Date: May 2002 Location: Friendswood, TX Posts: 700	Thanks, guys!! __________________ 69 C10 2WD LWB Fleet 350/350 power front disc conversion (6 lug disc kit from gmcpauls) and new engine, PS, A/C, fresh fluids, SHE DRIVES! FOR SALE $3900

09-23-2002, 03:27 PM	#3
Michael A. K. G Registered User Join Date: Jul 2002 Location: California central coast Posts: 126	No. It may mean that the turning resistance for the rear driveshaft is less than that for the far axle shaft. But it's likely you do. Put one rear wheel on the ground, and the transmission (or transfer case, if you have one) in neutral. Then turn the off-the-ground wheel by hand. If you can't, you have a functioning Posi. If you can, you have either an open diff or a worn out Posi. You can't tell an open diff from a worn out Posi without removing the diff cover and inspecting the diff. Note that if you have a 4x4, you have to either put the transfer case in neutral or raise the FRONT wheels, too.



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