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02-17-2011, 07:12 PM
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#1 |
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Registered User
Join Date: Dec 2010
Location: Medford, Oregon
Posts: 39
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Posi Rear End????
first of all.... my truck spins both tires when i do a burnout. i have been reading that a way to tell if your rear end has posi is to jack up the rear and spin a wheel. if the opposite wheel spins the same way.... then its a posi rear end. if the opposite wheel spins the opposite direction then it is NOT posi traction. so out of curiosity i jacked up the rear and spun the wheel.... the opposite wheel spun the opposite way.... so that would indicate NO posi right??? but both wheels spin while burning out and clearly leaves two tire marks and gets a little sideways.... i am confused now.
also what was the stock rear end on a 62' Chevy??? mine has 10 bolts and i dont know what gears.... thanks guys!
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62' Chevy C10 Shortbed, 350, 700r4 FRANKIE Last edited by Italia; 02-17-2011 at 07:15 PM. |
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02-17-2011, 08:53 PM
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#2 |
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Registered User
Join Date: Nov 2010
Location: bellingham wa
Posts: 68
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Re: Posi Rear End????
Posi, if the opposite rear wheel spins in the same direction. A open diff. will have the opposite tire spin in the other direction and a limited slip will some times leave the other wheel standing still and slowly start turning in the same direction.
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02-18-2011, 04:04 AM
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#3 |
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Registered User
Join Date: Dec 2007
Location: N Texas
Posts: 580
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Re: Posi Rear End????
How long have you had the truck?
Is this a new condition, or has it always spun both tires? If its always spun both tires, you have a posi, don't worry. If it's a new thing, just started leaving "scratch" with both tires, you can have an open diff that is failing and about to go boom. If it's a new truck to you, you probably need to change the gear oil anyway, so pop the diff cover and have a look.
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292 + TKO500 |
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02-18-2011, 09:36 AM
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#4 |
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"Where were you in '62?"
 
Join Date: Jul 2004
Location: Cleveland County, North Cackalacky
Posts: 5,013
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Re: Posi Rear End????
Jack up the rear end. Out of park or gear. Turn a rear wheel. If they turn in the same direction its posi. If they turn in the oppisite direction its non posi.
1960-1966 Chevy/GMC Pickup Truck Specs & Engine/Trans/Axle ID's http://67-72chevytrucks.com/vboard/s...d.php?t=327764 
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PROJECT: "FULL METAL YELLOW JACKET" 1962 Chevy C-10 Stepside Shortbed Nostalgia Pro/Street Pickup Truck PROJECT: "FULL METAL YELLOW JACKET Build Thread What Are You Workin' On? - 1Bad62ChevyPickup PROJECT: "TYRANNORAMBLER REX" 1969 AMC Rambler American Nostalgia Pro/Street Youtube Channel: Father Son Projects Youtube Channel: 2TIMOTHY2FITHTEEN  "North and South Carolina Folks Click Here!" (((( ~ I have Parts For Sale & Miscellaneous Stuff ~ )))) "Well being as there's no other place around the place, I reckon this must be the place, I reckon...Nyuk Nyuk Nyuk" -Curly Howard Ph.D. |
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02-19-2011, 01:04 AM
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#5 |
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60-66 Nut
 Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,246
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Re: Posi Rear End????
I've had open diffs spin both tires before. I don't know how to explain it, but it can happen.
The rear end in your truck is a GM55T which was used from 1955 thru 1962. The most common gears in those rear ends is 3.90's
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02-19-2011, 04:39 PM
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#6 |
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Registered User
Join Date: Dec 2010
Location: Medford, Oregon
Posts: 39
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Re: Posi Rear End????
Thanks captainfab and pro street... Great info...
Posted via Mobile Device
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62' Chevy C10 Shortbed, 350, 700r4 FRANKIE |
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02-20-2012, 04:27 AM
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#7 | |
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But Found Her 25yrs Later!
Join Date: Oct 2010
Location: Oregon City, Oregon
Posts: 10,522
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Re: Posi Rear End????
Quote:
I'm pretty sure that's what I have in my 65 on a 62 frame with torsion bars. It will leave two tracks when I stomp it.
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I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035 Last edited by LostMy65; 02-20-2012 at 04:32 AM. |
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02-20-2012, 09:22 AM
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#8 |
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1961 crewcab
Join Date: Dec 2007
Location: missoula, mt
Posts: 6,164
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Re: Posi Rear End????
kinda had this same issue with my 65... in the winter it acts like a posi... both spin, and it starts corkscrewing around like a posi will do... jacked it up turn one tire, the other turns the other way... jacked it up the other day with one tire still on the ground, and out of gear, and the rear is locked like a posi.... ???? gotta scratch around on the diff and find the code, unfortunatley there was no build sheet..
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60 build: http://67-72chevytrucks.com/vboard/s...d.php?t=280904 61 crew build: http://67-72chevytrucks.com/vboard/s...d.php?t=646830 63 build: http://67-72chevytrucks.com/vboard/s...d.php?t=336537 64 'burb build: http://67-72chevytrucks.com/vboard/s...d.php?t=448681 65 'burb build: http://67-72chevytrucks.com/vboard/s...d.php?t=590715 65 build: http://67-72chevytrucks.com/vboard/s...d.php?t=281955 |
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02-20-2012, 11:06 AM
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#9 |
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Registered User
Join Date: Aug 2009
Location: Burlington, WI
Posts: 52
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Re: Posi Rear End????
an old dirt track trick "back in the day" was to open up the bore on the spiders to allow them to twist under heavy load, thereby locking up like a posi. That could be what is happening to yours.. it way have worn in and now binds just enough to lock it up properly.
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