posi ? limited slip ? other ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sactoC10 · 11-29-2003, 09:17 PM

Okay,

I am just learning about these trucks and this board, so this may sound like a silly question, but anyway... In checking the ratio of this rear end I was going to spin the drive shaft and count wheel rotations. I have no wheels on the rear end right now. I also then went to the wheels and rotated one of them and noticed that the other did not rotate...

I then tried it again on the other side, doing the same, the opposite side did not rotate as I expected it to, in the opposite direction.

What does this tell me? Anything good? Something bad?

Thanks.

gonebad2 · 11-29-2003, 10:01 PM

Sounds like a normal non-posi one legger rear end to me. I think if it was a posi, both of the wheels would turn in the same direction when you turn one of them. I could be wrong though....Anyone else know for sure.

jamis · 11-29-2003, 10:18 PM

Thats normal.....you have an open diff.

imdarren · 11-29-2003, 10:21 PM

The two terms Posi and Limited slip, are the same.
I think it was the company Eaton that coined the phrase Posi.
General Motors later built the same rearend and called it Limited slip. Posi / limited slip is where there are clutches in the rearend that loc up when one wheel slips, and engages both rear wheels.
By what you described with your wheels spinning (or not spinning in your case) sounds like what you have is what most folks call an "open diferential". This is when only one wheel drives the rear. No matter what. Doesnt matter how slippery the condidions, only one wheel drives.
There is also what some folks call a "Dertoit Locker" or just a "Locker". This is just like a Posi / limited slip, but instead of clutches, there is a mechanical ratchet mecanism. When you go around a corner with a "locker" rearend, you can hear the ratchet sound. Thse are mostly aftermarket, and used in "Off Road" trucks / conditions.

Darren

sactoC10 · 11-29-2003, 11:18 PM

Then in what situation/configuration, does the opposite wheel (say left) rotate in the opposite direction when the (say right) is turned?

Or am I just thinking of my old remote control car days and simply asking a REALL STUPID question concerning these trucks? It could happen!

Thanks,
Jeff

junkyardjohn · 11-29-2003, 11:30 PM

Quote:

Or am I just thinking of my old remote control car days and simply asking a REALL STUPID question concerning these trucks? It could happen!

NOT AT ALL JEFF --- MOST ALL OF THE ONE LEGGERS WHEELS SPUN IN DIFFERENT DIRECTIONS ,THAT I'VE HAD ANYTHING TO DO WITH TOO.

JOHN

dinnut · 11-30-2003, 04:54 AM

ok with my truck im pretty sure its a open diff but not sure. this test was performed on stones btw... in forward the right rear wheel spins and in reverse both wheels spin...?????

**FRENCHBLUE72** · 11-30-2003, 11:32 AM

Dinnit it's open... Jeff there are no stupid question's only those not asked IMO..

**1970 CST Short Wide** · 11-30-2003, 12:41 PM

I'm with FRENCHBLUE72 There ARE no stupid ?'s Ask away

11-29-2003, 09:17 PM	#1
sactoC10 71 DELUX Join Date: Sep 2003 Location: Northern CA / Sac Posts: 1,056	posi ? limited slip ? other ? Okay, I am just learning about these trucks and this board, so this may sound like a silly question, but anyway... In checking the ratio of this rear end I was going to spin the drive shaft and count wheel rotations. I have no wheels on the rear end right now. I also then went to the wheels and rotated one of them and noticed that the other did not rotate... I then tried it again on the other side, doing the same, the opposite side did not rotate as I expected it to, in the opposite direction. What does this tell me? Anything good? Something bad? Thanks.

11-29-2003, 10:01 PM	#2
gonebad2 Merciless Butcher Join Date: Oct 2003 Location: CC Nevada Posts: 1,447	Sounds like a normal non-posi one legger rear end to me. I think if it was a posi, both of the wheels would turn in the same direction when you turn one of them. I could be wrong though....Anyone else know for sure. __________________ Your Bought And Sold....I Got Your Soul!

11-29-2003, 10:21 PM	#4
imdarren Registered User Join Date: Oct 2001 Location: SW Washington Posts: 1,006	The two terms Posi and Limited slip, are the same. I think it was the company Eaton that coined the phrase Posi. General Motors later built the same rearend and called it Limited slip. Posi / limited slip is where there are clutches in the rearend that loc up when one wheel slips, and engages both rear wheels. By what you described with your wheels spinning (or not spinning in your case) sounds like what you have is what most folks call an "open diferential". This is when only one wheel drives the rear. No matter what. Doesnt matter how slippery the condidions, only one wheel drives. There is also what some folks call a "Dertoit Locker" or just a "Locker". This is just like a Posi / limited slip, but instead of clutches, there is a mechanical ratchet mecanism. When you go around a corner with a "locker" rearend, you can hear the ratchet sound. Thse are mostly aftermarket, and used in "Off Road" trucks / conditions. Darren __________________ Washington State 1967 Chevy C10 LWB Rodstoration In Progress. 1972 K20 Cheyenne Super

11-30-2003, 04:54 AM	#7
dinnut Registered User Join Date: Apr 2003 Location: missouri city, tx Posts: 4,486	ok with my truck im pretty sure its a open diff but not sure. this test was performed on stones btw... in forward the right rear wheel spins and in reverse both wheels spin...????? __________________ 70 longbed 496/th400/Ford 9"

11-30-2003, 11:32 AM	#8
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,594	Dinnit it's open... Jeff there are no stupid question's only those not asked IMO.. __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

11-29-2003, 10:18 PM	#3
jamis F.A.S.T. president Join Date: Sep 2003 Location: Florida Posts: 1,883	Thats normal.....you have an open diff.

11-29-2003, 11:18 PM	#5
sactoC10 71 DELUX Join Date: Sep 2003 Location: Northern CA / Sac Posts: 1,056	Then in what situation/configuration, does the opposite wheel (say left) rotate in the opposite direction when the (say right) is turned? Or am I just thinking of my old remote control car days and simply asking a REALL STUPID question concerning these trucks? It could happen! Thanks, Jeff

11-30-2003, 12:41 PM	#9
1970 CST Short Wide Senior Moment Join Date: Mar 2002 Location: Pittsburg Ca Posts: 4,101	I'm with FRENCHBLUE72 There ARE no stupid ?'s Ask away __________________ 1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565



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