Marks Mopars
Member
just bought a stock 318 72 scamp
whats the rear end ring gear size and ratio???? THANKS TO ALL,
whats the rear end ring gear size and ratio???? THANKS TO ALL,
1972 scamp 318 STOCK
- Thread starter Marks Mopars
- Start date
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idk, theres a few threads on how to find out ratios, but to get an idea you can jack it up, spin the wheel and count how many times the driveshaft turns for each complete turn of the rear wheel.
Ex: if the shaft spins just under 3-1/2 times as the wheel completes one turn, you prob have 3.23s.
If the shaft spins to just past the 3-1/2 mark, you likely have 3.55s
Enjoy the new Scamp!
Ex: if the shaft spins just under 3-1/2 times as the wheel completes one turn, you prob have 3.23s.
If the shaft spins to just past the 3-1/2 mark, you likely have 3.55s
Enjoy the new Scamp!
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Johnny Dart
Well-Known Member
Going to have to bust out the crystal ball on this one.
Do you know if you have a 7.25" or 8.75" rear end ?
Do you know if you have a 7.25" or 8.75" rear end ?
Professor Fate
Push the button, Max...
to ID your rear:
Then look for a metal tag on one of the cover bolts- it will have the ratio stamped on it. If the tag is missing, jack the rear up and spin the tire, counting the number of times the driveshaft spins, that will give you a close approximation- i.e. 3.23:1. Your other option is to pull the rear cover and look for the stamp on the ring gear.
Then look for a metal tag on one of the cover bolts- it will have the ratio stamped on it. If the tag is missing, jack the rear up and spin the tire, counting the number of times the driveshaft spins, that will give you a close approximation- i.e. 3.23:1. Your other option is to pull the rear cover and look for the stamp on the ring gear.
just bought a stock 318 72 scamp
3.23 & 2.76 ratios were common for that year.
Most likely it will be a 7.25 axle, unless someone has upgraded it.
My 70 Swinger came with a 8 3/4 with a 2.76 open.
Counting the bolts on the back of the rear diff will for sure tell you if it’s a 7 1/4 or a 8 3/4.
However, does the car have a front sway bar or heavy duty cooling package? That might be another clue as to what rear diff it has.
However, does the car have a front sway bar or heavy duty cooling package? That might be another clue as to what rear diff it has.
Just an FWI, if he chooses to do the jack it up and spin the tire method, with 1 wheel off the ground, it requires 2 (two) rotations of that tire to be able to count the drive shaft # of turns, for a quickie axle ratio guess, WITH AN "OPEN" DIFF, with a sure grip, both tires off the ground would be 1 turn of the tire.
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