Diff I.D. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Richard Dobson · 07-11-2005, 08:59 AM

Can a rear differental be identified as postitive traction without taking off the cover. I know on my existing truck that while the manual trans is in neutral and the rear end jacked up while turning one wheel the other doesn't turn, but with the transmission in gear the wheels will turn in opposite directions. I am looking at a trans that the owner says is supposed to be a posi, but isn't sure. I don't think he would be to agreeable to removing the cover and draining the oil. Thanks

**dennislbrooks** · 07-11-2005, 10:48 AM

with both rear wheels off the ground, transmission in neutral, emergency brake off (chock front wheels both sides) , and engine NOT running -- by hand turn one side forward or backward and the opposite wheel should turn the SAME direction by itself.

If not posi, the opposite wheel will turn the opposite direction. Could be wrong. 8-)

TN70C10 · 07-11-2005, 07:41 PM

rwgregory · 07-12-2005, 01:20 AM

Put trans in neutral, block front wheels, E-brake off, just jack up one rear wheel and
see if it spins. If it spins, she no gotta posi. Also, crawl under the truck and inspect
the rear end housing. All limited slip differentials, no matter what make they are will
leave the factory with a tag saying "USE LIMITED SLIP GEAR LUBE ONLY".

Richard Dobson · 07-12-2005, 08:33 AM

Thanks Guys

07-11-2005, 08:59 AM	#1
Richard Dobson Registered User Join Date: Apr 2003 Location: Easley, South Carolina Posts: 491	Diff I.D. Can a rear differental be identified as postitive traction without taking off the cover. I know on my existing truck that while the manual trans is in neutral and the rear end jacked up while turning one wheel the other doesn't turn, but with the transmission in gear the wheels will turn in opposite directions. I am looking at a trans that the owner says is supposed to be a posi, but isn't sure. I don't think he would be to agreeable to removing the cover and draining the oil. Thanks __________________ Richard Dobson

07-11-2005, 10:48 AM	#2
dennislbrooks Senior Member Join Date: Feb 2004 Location: Williamsburg, Ohio Posts: 1,775	not an expert with both rear wheels off the ground, transmission in neutral, emergency brake off (chock front wheels both sides) , and engine NOT running -- by hand turn one side forward or backward and the opposite wheel should turn the SAME direction by itself. If not posi, the opposite wheel will turn the opposite direction. Could be wrong. 8-)

07-12-2005, 01:20 AM	#4
rwgregory Registered User Join Date: Apr 2005 Location: Chula Vista, California Posts: 495	Put trans in neutral, block front wheels, E-brake off, just jack up one rear wheel and see if it spins. If it spins, she no gotta posi. Also, crawl under the truck and inspect the rear end housing. All limited slip differentials, no matter what make they are will leave the factory with a tag saying "USE LIMITED SLIP GEAR LUBE ONLY". __________________ rwgregory 67 GMC 2500 ,2w/d wide box 305 V-6, 4-speed

07-12-2005, 08:33 AM	#5
Richard Dobson Registered User Join Date: Apr 2003 Location: Easley, South Carolina Posts: 491	Thanks Guys __________________ Richard Dobson

07-11-2005, 07:41 PM	#3
TN70C10 Registered User Join Date: Jun 2005 Location: Chattanooga TN Posts: 115



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.