64 ss differential decode - Impala Tech
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post #1 of 11 (permalink) Old 01-17-2008, 11:42 PM Thread Starter
 
 
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64 ss differential decode

Hello, any help with the following code from a 64ss diff is appreciated....j1662 8726899....... also stamped seperately in larger print GM T7. Thanks
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post #2 of 11 (permalink) Old 01-18-2008, 08:10 AM
 
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Does it have a big P stamped beside the yoke housing?



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post #3 of 11 (permalink) Old 01-18-2008, 12:46 PM Thread Starter
 
 
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Did not see "P" on the diff.......thks
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post #4 of 11 (permalink) Old 01-19-2008, 10:42 AM
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Your rear end is an open rear end,not positraction.The number you show should start with a 3 not 8.It should read 3726899.In order to find your gear ratio,you need to get the correct codes.The codes are stamped into the front right or passenger side of the differential carrier.It will be stamped at the same height as the axle shafts.The code will start with a 2 letter prefix and followed by 3 numbers.The 2 letters will tell you your gear ratio.Then the next three numbers will you give you month and year.(EXAMPLE:AU-409: AU=4:56, 04=Month April, 9=9th day) .The months on 1963-1964 Chevy rear assembly will be on 2 numbers.January 012,February 02,etc.The last number will be day it was manufacturered.On earlier assemblies 1955-1962 months were broken into number 1-12.The numbers only apply if your rear housing and jack pot that are original to the car. You may have to wire brush that area to locate and read the numbers.Get me the info and I'll let you know rear ratio you have. JOHN

1964 Chevrolet Impala Convertible-409/425hp,4 speed,3:73 posi,original owner
1973 Corvette Stingray Coupe-350/275hp-L-82,4 speed,posi rear-original owner
2005 Cadillac CTS-V,Z06 Corvette Motor,6 speed ,posi rear end,original owner





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post #5 of 11 (permalink) Old 01-20-2008, 03:21 PM Thread Starter
 
 
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update

BB 102...thks PJ1
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post #6 of 11 (permalink) Old 01-20-2008, 03:37 PM
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Rear ratio is 3.36:1, Oct 2nd ,John

1964 Chevrolet Impala Convertible-409/425hp,4 speed,3:73 posi,original owner
1973 Corvette Stingray Coupe-350/275hp-L-82,4 speed,posi rear-original owner
2005 Cadillac CTS-V,Z06 Corvette Motor,6 speed ,posi rear end,original owner





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post #7 of 11 (permalink) Old 01-20-2008, 03:49 PM Thread Starter
 
 
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Finally found a link with the code specs...... the 1964 prefix "BB" called for a 3.36 gear as a 3speed six cyl......I checked my vin and verified as a SS eight cyl w/powerglide. Must be a replacement ......3.08 would have been less RPM cruiser gears!
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post #8 of 11 (permalink) Old 01-20-2008, 07:54 PM
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James,3.36 are good gears,because you have performance and hiway.A lot of people are looking for that ratio,if you change housing you will have no problem selling that housing.Also the "BB" Code was used in 1961 and 1962 Chevy station wagons with 6 cyl.,283,348,327,and 409ci motors as well. Its possible the rear in your car was changed.The date number you gave me was only 3 digits it should have 4 digits,is that correct??? John

1964 Chevrolet Impala Convertible-409/425hp,4 speed,3:73 posi,original owner
1973 Corvette Stingray Coupe-350/275hp-L-82,4 speed,posi rear-original owner
2005 Cadillac CTS-V,Z06 Corvette Motor,6 speed ,posi rear end,original owner





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post #9 of 11 (permalink) Old 01-21-2008, 01:00 AM Thread Starter
 
 
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Im sure I missed the fourth digit, Ill check again...thanks for sharing the info. Also a thaught...during travel there is a distinct or obvious vibration...drone....Hummm ect. that is felt on the floorboard/seats. My guess would be a motor/trans mount needs to be replaced,hopefully not a driveline prob. Are these descriptions a known or common sympton of a defective part. Again thks John you have been a great help.
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post #10 of 11 (permalink) Old 01-21-2008, 08:41 AM
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Sounds like a tranny mount or center carrier going bad.Possibly unniversal joints.I'd check tranny mount first,then the center carrier bearing assembly betweem both drive shafts.If that is bad I'd suggest buying the billet assembly that Showcars sells.This thing will hold up the life of your owning the car.It cost about a $100.00 well worth it though. John

1964 Chevrolet Impala Convertible-409/425hp,4 speed,3:73 posi,original owner
1973 Corvette Stingray Coupe-350/275hp-L-82,4 speed,posi rear-original owner
2005 Cadillac CTS-V,Z06 Corvette Motor,6 speed ,posi rear end,original owner





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post #11 of 11 (permalink) Old 01-21-2008, 01:53 PM Thread Starter
 
 
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Thanks for the info John.....under the car I go!
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