Rear End Gear??
01-08-2002, 10:14 PM
#1
Burning Brakes
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Location: Spartanburg SC
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St. Jude Donor '10
Rear End Gear??
I have a 77 L48. How do you know what gear ratio is in the rear? Heard there's a code on the housing, but what means what? Any other way to tell?
Thanks for all the help!!!!!!! :cheers: :chevy
Thanks for all the help!!!!!!! :cheers: :chevy
01-08-2002, 10:23 PM
#2
Le Mans Master
Re: Rear End Gear?? (DP77Vette)
The code is on the flange between the rear cover and the main housing right under the bottom. You can always lock one wheel and turn the drive shaft and count the turns it takes to make one revolution of the wheel. This will be the ratio. 2.75, 3.08, 3.55, 3.70 turns etc.
01-09-2002, 12:11 AM
#5
Instructor
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Re: Rear End Gear?? (DP77Vette)
try this formula:
tire diamater inches x rpms at 60
-----------------------------------------
20178
this will give you the rear gear ratio. if you are at 3000 at 60 with a 26 inch tire, it comes out to 3.87- possibly a 3.90 gear. you will need an accurate speedometer and tachometer to use this method though. also, it will only work at 1 to 1 transmission ratio. use "drive" if you have an overdrive trans
Matt
[Modified by Matt M, 4:12 AM 1/9/2002]
[Modified by Matt M, 4:18 AM 1/9/2002]
tire diamater inches x rpms at 60
-----------------------------------------
20178
this will give you the rear gear ratio. if you are at 3000 at 60 with a 26 inch tire, it comes out to 3.87- possibly a 3.90 gear. you will need an accurate speedometer and tachometer to use this method though. also, it will only work at 1 to 1 transmission ratio. use "drive" if you have an overdrive trans
Matt
[Modified by Matt M, 4:12 AM 1/9/2002]
[Modified by Matt M, 4:18 AM 1/9/2002]