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Old 06-19-2018, 07:26 PM   #2
Clyde65
1965 Chevy C10, 2005 4.8L/4l60
 
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Join Date: Aug 2004
Location: DFW Texas
Posts: 8,539
Re: New rear gears for 65 230 manual, suggestions?

You need to find out what you have. Put both wheels off the ground, trans in nuetral, block the wheels!!!
Then mark the drive shaft and the wheel, turn wheel and countthose revolutions and the driveshaft as well. Divide and there is your gear ratio.
I’m suspecting you probably have 4:10’s, 3.73’s would be the highest you can go. Maybe you would benefit from a t5 swap instead??
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