76L rear end question
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Joined: Nov 2007
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From: sobieski wisconsin
76L rear end question
i need to find out the rear end gearing in my 1976L vett.when i turn the tire one turn,the drive shaft [input shaft] turns one and a half turns.is this a accurate way of finding out?is there a chart on this ?any way of finding out from the vin #?thanks,tj
Drifting
Joined: Jan 2004
Posts: 1,991
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From: Piscataway NJ
Jack the car up and wire brush the bottom of the diff. There should be some stamping codes there.
OA = 3.08
OD = 3.36
LR = 3.36
OB= 3.55
OC= 3.70 Barring any previous owner gear change. These are factory codes.
OA = 3.08
OD = 3.36
LR = 3.36
OB= 3.55
OC= 3.70 Barring any previous owner gear change. These are factory codes.
Race Director
Joined: Dec 1999
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From: Forked River NJ
Something is not right here. The driveshaft should turn a minimum of 3 turns which would indicate a 3.08. Jack up both wheels and turn the driveshaft and count the driveshaft rev. per one turn of tire. This is the most accurate way. Make sure both wheels are off the ground. The numbers are another way if you can be sure noone has been in there and changed the gears before you.
Race Director
Joined: Dec 1999
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From: Forked River NJ
If you could turn the wheel relativly easily with one wheel still on the ground it sounds like your posi unit is smoked. Probably could use a rebuild. A new and properly rebuilt rear will take a LOT of effort to turn only one wheel.
Also make sure the trailing arms are not hanging down. The ujoints will bind up making it almsot impossible to turn the wheels. Support the trailing arms somehow.
Team Owner
Joined: Oct 2004
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From: Springfield MO
St. Jude Donor '07
Drifting
Joined: Oct 2007
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From: Collinsville MS
St. Jude Donor '08
found mine the other night. Bottom of the diff side, not the cover, handstamped so you may have to look close.
Pro
Joined: Sep 2006
Posts: 547
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From: Carlstadt NJ
Put a 5/8 socket under the trailing arms and the frame to set the wheels at ride height before you spin them. Also, if you can get the cover off, count the ring gear teeth and then divide with the number of pinion teeth to get the Raito. But, in most cases the code on the case will tell you what's in there. See above for the codes.
Danny
Danny
Last edited by hicswa; Jan 3, 2008 at 10:21 PM.
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Thread Starter
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Joined: Nov 2007
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From: sobieski wisconsin
the housing was rusted real bad befor i sand blasted it and painted.there is nos there but cannot make them out
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From: sobieski wisconsin
yes,when both wheels are off the ground the drive shaft turns just over 3 turns.but as i am turning the input shaft,sometimes the left wheel will stop turning for a second and then turn again.dont kow what to do tj
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Joined: Nov 2007
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From: sobieski wisconsin
i had the rear end apart last summer and replaced brgs and seals,did not have posi apart.snap rings were broke.what is the purpose of the snap rings? did a piece get in the posi?thanks for everbodys help,tj
Tech Contributor
Joined: Aug 1999
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From: Connecticut, USA
The snap rings hold the side yokes(axles) in place. If you replaced the brg's and seals then I hope you checked the pattern as it may have changed once you removed the case.
Rings can end up in the spiders and gears and that could lock them up and break the diff.
Rings can end up in the spiders and gears and that could lock them up and break the diff.
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From: sobieski wisconsin
i just replaced the carier brgs and output seals.what pattern are you talking about,the pinion to ring gear?it sounds like from what every body is saying,there is something wrong in the carrier somewhere.i am going to remove it today and dissasemble and inspect.thanks,tj
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From: sobieski wisconsin
Last edited by tjohn1008; Jan 7, 2008 at 05:14 PM.