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Necoa #: 11696
Location: 7(AL,GA,TN)
Joined: May 10, 2008
Posts: 23
Year: 1972
Model: El Camino
Posted: Mon Jun 02, 2008 11:36 am Post subject: How to determine your rear end...?
Is there any way to tell what ratio your rear end is by looking at it? I ask because my car has been partially restored in the past, and I'm curious to know... Thanks!
Otherwise you have to remove the differential cover and count the teeth on the ring and pinion gears.
Counting Gear Teeth:
Count the teeth on ring and pinion gears.
Divide the tooth count of ring gear by the tooth count of pinion gear.
Estimate Ratio by Rotating Tires:
•Select a level surface to conduct test (Safety First!);
•Mark the edge of the tire with chalk (bottom);
•Mark a spot on the drive shaft so you can observe the number of revolutions while the shaft rotates;
•Put the vehicle in neutral (Revert back to step one if vehicle rolls);
•Push the vehicle straight ahead (by hand!) until the tire rotates exactly one rotation (360°);
•Count drive line turns as the vehicle moves.
Note: Have a friend push while you do the hard part: Watch and count! (be careful not to spill your favorite legal beverage).
This will work if you accurately count the revolutions. I have a few examples below:
3 turns on the drive shaft will be 3.00 to 1
3-1/4 turns on the drive shaft should be 3.25 to 1
3-1/2 turns on the drive shaft indicates 3.50 to 1
3-3/4 turns on the drive shaft should be 3.70 to 1
4 drive shaft turns will equal 4:10 to 1
4-1/2 turns consider 4.56 to 1
5 1/3 indicates 5.38 to 1.
All this info. I got by searching.
John Don't claim all info. is 100% accurate
_________________
72 SS 454/700r4
(A real SS that got a 454 along the way)
"Great Threads" web site
Necoa #: 11730
Location: 9(IN,KY,MI)
Joined: May 15, 2008
Posts: 132
Year: 1978
Model: El Camino
Posted: Mon Jun 02, 2008 12:56 pm Post subject: rearend ratio
unfortunatley you cant tell just by looking .. you can tell if its a 7.5..8.5 .. or a 12 bolt just by looking but not the ratio .. you need to remove the rearend cover and count the number of splines in the gear and the pinion .. thats the easiest way you can tell..good luck !! _________________
Necoa #: 11730
Location: 9(IN,KY,MI)
Joined: May 15, 2008
Posts: 132
Year: 1978
Model: El Camino
Posted: Mon Jun 02, 2008 1:01 pm Post subject: great idea
its been so long since i did that but Larry is absolutely correct .. You will get an estimate but in order to find out for sure remove the rearend cover and count the splines in the gear and pinion .. thanks for reminding me of that Larry !! _________________
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