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03-01-2004, 07:35 PM
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#1 |
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Registered User
Join Date: Apr 2003
Location: missouri city, tx
Posts: 4,486
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posi?
my main question: do i have a posi/limited slip rear end. i have a stone drive way so spinnign the tires is very easy. today i uh "accidentally" floored. this was after backing up and pulling forward a couple times. went behind the truck and both wheels had spun! usually on the right wheel spins! i might have to try it again later just to see if it does it again! the truck seemed like it was twisting when i held on the throttle for a second. is it possible that only both engage sometimes??? and usually on the right engages. i know the only real way to know is to pull the rear diff cover and find out but too lazy right and know and was just wanting some of yalls input. the previous owner said this rear was swapped in because the other rear end wasnt very highway friendly. and i was going to maybe swap in the rear end out of my 72 which is not a posi and im hoping the 70 has the wider rear now so i dotn have to swap the whole setup, just the axles!
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70 longbed 496/th400/Ford 9" |
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03-01-2004, 07:40 PM
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#2 | |
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Registered User
Join Date: Feb 2003
Location: The Rubber City
Posts: 5,498
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Quote:
i'm guessing that you don't. open diff axles can still spin both axleshafts if they are both getting just about the same amount of traction, which would probably only happen in a loose terrain (like your gravel driveway, sand, mud, etc.)
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1969 GMC K2500  1996 Honda Accord 2007 Kawasaki KLR 650 |
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03-01-2004, 08:17 PM
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#3 |
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Like a Rock!
Join Date: May 2002
Location: USA
Posts: 1,092
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I would hold the brake hard and give it full throttle. You should see 2 marks. I think if you jack the rear up and spin the tire by hand , they should both spin in the same direction. Not sure though.
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69 LWB Runs great - work in progress Mess with me and you mess with the whole trailer park! 
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03-01-2004, 08:42 PM
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#4 |
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Formerly yellow72custom
Join Date: May 2001
Location: Austin, TX
Posts: 7,531
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c10crazy is correct
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'72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg |
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03-01-2004, 11:18 PM
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#5 |
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huh ???
Join Date: Nov 2002
Location: Fredericksburg,Va.
Posts: 3,368
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Only problem with holding the brake and doint it the brake tricks the rear into thinking both tires have the samp amount of traction. I've done this is a truck that I know has an open rear and it acted like a posi...
Chuck
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90 Blazer Silverado 350w/ 700R4 and 32" Kelly's "I am a bomb technician. If you see me running try to keep up!" |
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03-01-2004, 11:36 PM
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#6 |
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Registered User
Join Date: Apr 2003
Location: missouri city, tx
Posts: 4,486
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eh i dont really have my hopes up, but ill be testing it soon to see if it is a posi
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70 longbed 496/th400/Ford 9" |
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03-02-2004, 03:54 AM
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#7 |
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Registered User
Join Date: Feb 2003
Location: The Rubber City
Posts: 5,498
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sure-fire way to check is to pop the diff cover...heck, gear oil is cheap and you probably need some new anyways.
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1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650 |
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03-02-2004, 05:56 AM
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#8 |
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Seasonal Poster
Join Date: Apr 2002
Location: Kelowna BC Canada
Posts: 896
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jack up the rear end and spin one wheel, if they both spin the same way it's a posi or limited slip, if they spin opposite, its an open diff, just like c10 said
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67 GMC Short Step 350/4-Speed/3.08 Posi Front/Rear Sway Bars Kelowna BC, Canada Member of DTPW |
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03-02-2004, 09:40 AM
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#9 |
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Registered User
Join Date: Jan 2004
Location: NH
Posts: 2,266
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Jack up one side if you can turn wheel it's not a posi..
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03-03-2004, 01:37 AM
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#10 |
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Join Date: Dec 1999
Location: Eastern - Manitoba Canada, Winnipeg
Posts: 4,369
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a posi could still spin only one tire if other was on the ground still.. best to get both tires in the air at same time and then spin a tire and wait to see if other spins in same direction. Still if you think its possible, I would still pull the cover and make sure....stuff wears out.
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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. |
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03-03-2004, 03:28 AM
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#11 |
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Registered User
Join Date: Nov 2003
Location: Alexandria, VA
Posts: 1,534
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Yep, only way to know for sure is to pull the cover. If the clutches and springs are worn in a posi it will act like an open diff. Have you checked the glove box door to see if it was and option?
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'72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction.  
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03-03-2004, 11:14 AM
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#12 |
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Registered User
Join Date: Jul 2001
Location: North Woods, Minnesota
Posts: 196
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What if you park with one tire on gravel and one on the pavement? If the gravel side spins it's... Open? If they both spin it's... Posi? If neither spin... You need more horsepower!
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'72 Suburban 4X4 "Save the Earth, kill yourself" |
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