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Old 12-10-2010, 03:45 PM
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1964 Biscayne rearend ID help needed

hello, i need help, i have a 1964 biscayne that looks all orig, im trying to figure out the rear end, i have read all day, and tried everything and cant figure it out, the numbers on the carrier have G103, 3725899, GM32, i have wire wheeled the whole axle on the passenger and driver side and find no letters or numbers, i took the trans out of gear and rotated the drive shaft to see if i could get the ratio, but the wheels spinn the same way they just done spin at the same speed, sometimes the driver spins for a second then stops and then the passenger spins a while and stops, then they both spin for a second, so im confuzzzzzzed, i know i drink alot of beer, but i cant figure it out and the dog is no help at all, he just waits for me to spill my beer so he can lick it up, if you guys have any ideas please help, thanks

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Old 12-10-2010, 05:53 PM
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This will be the '55-'64 8.2 rear end. If it has a standard differential then leave one wheel on the ground and turn the other wheel exactly 2 full turns. If the drive shaft turns just past 3 turns then it's a 3.08, if it turns 2 3/4 turns then it's a 2.73, if it turns 3 1/3 turns then it's a 3.36... It helps to have at least 2 people do this.

The best way to do it is to remove the chunk and count the teeth. Divide the number on the ring gear by the number on the pinion. 41/15 = 2.73 The oil probably needs to be changed anyway, so this would be best.
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Old 12-10-2010, 07:06 PM
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the rear end also has a tag on the fron of the axle where the numbers are and the tag looks like a pac man tag, or a circle with a V cut out of it, do you think it could be a posi? or not? i have read that if both tires turn the same way when its off the ground then it should be, i am gonna be puttin a 1970 chevelle ss 350 4 bolt with the 3 on the tree in the car will the rear be ok? thanks,,,,,
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Old 12-10-2010, 07:50 PM
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All rear ends will turn the wheels in the same direction when you turn the drive shaft. If you turn one wheel and the drive shaft doesn't turn then the other wheel will turn in the opposite direction. The tag probably has the gear ratio on it. If it's a posi rear end then there will be a large P cast into the front of the case.
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Old 12-10-2010, 08:38 PM
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This rear won't be a good fit into a Chevelle, won't bolt-in without a bunch of welding and fab work not to mention it is weaker than the stock Chevelle 10-bolt rear. Why do you want to use it?? Makes no sense.
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Old 12-10-2010, 08:52 PM
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Originally Posted by ericnova72
This rear won't be a good fit into a Chevelle, won't bolt-in without a bunch of welding and fab work not to mention it is weaker than the stock Chevelle 10-bolt rear. Why do you want to use it?? Makes no sense.
I think he is saying he is taking a 70 chevelle engine and putting it in the 64,,,,,,
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Old 12-10-2010, 08:54 PM
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Originally Posted by poncho62
I think he is saying he is taking a 70 chevelle engine and putting it in the 64,,,,,,
My bad, had to read it again, looks like you are correct.
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Old 12-10-2010, 10:33 PM
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Quote:
Originally Posted by big gear head
This will be the '55-'64 8.2 rear end. If it has a standard differential then leave one wheel on the ground and turn the other wheel exactly 2 full turns. If the drive shaft turns just past 3 turns then it's a 3.08, if it turns 2 3/4 turns then it's a 2.73, if it turns 3 1/3 turns then it's a 3.36... It helps to have at least 2 people do this.

The best way to do it is to remove the chunk and count the teeth. Divide the number on the ring gear by the number on the pinion. 41/15 = 2.73 The oil probably needs to be changed anyway, so this would be best.
2:73 was not available 55-64. Only 3.08-4.56
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Old 12-10-2010, 11:19 PM
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Yea, that was just an example of counting the drive shaft rotations. I didn't mean that it was a possible ratio. I used that from another post that I had just finished, copy and paste. Whats the gear ratio in a 1972 pontiac lemans
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Old 12-11-2010, 05:44 AM
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thanks again

i didnt see a letter p on the front, sooooo, well you know we can all dream, i have checked everything about the 64 chevy biscayne and everything looks very orig, it has like 59,000 miles showing, the only things i found funny was it has a 1968 2bbl intake and 2 jet rockchester on it, when i took the carb to the parts store for the rebuild kit it came back as a 1968 camero , and the axles had been painted bright red,the guy from the estate sale i got it from said the guy that owned it did alot of work on the car and also did something to the rear end. he was gonna give me a list of what the owner did ,but could not find it, sooo , towed the car home and put a battery on it and put some gas in the carb and she fired right up,,,,,with a few pounds of dirt dobber nest flying out the exhaust pipe, so now im trying to figure out what the old girl has in her, the trans is a 3 on the tree with a big chrome handle under the dash that says overdrive, but, the cable is just tied off under the trans,i think most chevys that had a overdrive with a 3 speed had a big fat thing on the side or back of the trans, soooo, im confuzzed again, and if it came with the overdrive then it would be a crazy gear in the rear end?
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Old 12-11-2010, 07:08 AM
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Quote:
Originally Posted by 1964BELOW
i didnt see a letter p on the front, sooooo, well you know we can all dream, i have checked everything about the 64 chevy biscayne and everything looks very orig, it has like 59,000 miles showing, the only things i found funny was it has a 1968 2bbl intake and 2 jet rockchester on it, when i took the carb to the parts store for the rebuild kit it came back as a 1968 camero , and the axles had been painted bright red,the guy from the estate sale i got it from said the guy that owned it did alot of work on the car and also did something to the rear end. he was gonna give me a list of what the owner did ,but could not find it, sooo , towed the car home and put a battery on it and put some gas in the carb and she fired right up,,,,,with a few pounds of dirt dobber nest flying out the exhaust pipe, so now im trying to figure out what the old girl has in her, the trans is a 3 on the tree with a big chrome handle under the dash that says overdrive, but, the cable is just tied off under the trans,i think most chevys that had a overdrive with a 3 speed had a big fat thing on the side or back of the trans, soooo, im confuzzed again, and if it came with the overdrive then it would be a crazy gear in the rear end?
if it's an OD car it probably has a 3.55 -4.11 gear
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Old 12-11-2010, 08:38 AM
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Quote:
Originally Posted by big gear head
This will be the '55-'64 8.2 rear end. If it has a standard differential then leave one wheel on the ground and turn the other wheel exactly 2 full turns. If the drive shaft turns just past 3 turns then it's a 3.08, if it turns 2 3/4 turns then it's a 2.73, if it turns 3 1/3 turns then it's a 3.36... It helps to have at least 2 people do this.

The best way to do it is to remove the chunk and count the teeth. Divide the number on the ring gear by the number on the pinion. 41/15 = 2.73 The oil probably needs to be changed anyway, so this would be best.

1964Below... did you read this post? The member tells you how to determine the gear ratio.

Jack the rear tires off the ground and properly support them. Then check for gear ratio via turning the tires both at same time while the drive shaft rotations are counted.

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Old 12-12-2010, 07:53 AM
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thanks

yep, got it, i am trying to get my wife to help, thanks
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Old 12-12-2010, 07:59 AM
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Thanks 1930

THANKS, i am a little lazy and with the wife helping was just trying to ask the smart guys so i could get in the ball park, i can get her help for about 5 minutes after that , well, ,,,but any way thanks again 1930
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