RPM clueless
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1:1? What happens if the OP has an OVERDRIVE 4 speed?
There are plenty of online calculators. Google speed gear rpm calculator
You need to know the transmission final ratio, 1:1 in a conventional 4 speed, "point something" if you have an OD that is .73. Don't know if they are all the same for the OD ratio
So you need the above, you need the tire size, and the rear axle ratio. Easy way to determine that is look for a "tag" on the rear axle. BUT THE GEARING MAY have been changed!!!!!!!!
So jack up one rear wheel. Block the front tires, put the transmission in neutral, and release the parking brake. See if you can turn the tire. If you can, watch the driveshaft and turn the tire exactly TWO turns. Count the driveshaft turns. If you have a 2.63, etc ratio, the shaft will turn 2 1/2 turns plus a bit. If you have a 3.23, it will turn 3 and very close to 1/4 turn, etc, etc
IF with the above conditions you CAN NOT turn the wheel, it means you have some form of limited slip AKA "Sure Grip" registered branded copyrighted business trademark of the "we used to be Chrysler Corp now Fiat"
So NOW you must jack up BOTH rear wheels. This time, turn one wheel, and the other should "follow" exactly ONE turn Again, count shaft turns for the rear ratio
HOW DO YOU KNOW if you have a conventional 4 speed or an OD (overdrive)? EASY Stick your head under the car on the driver side so you can see the shift linkage on the side of the gearbox. LOOK AT the front shift lever. If it points up, you have a 4 speed, 1:1 ratio. If the lever points DOWNwards you have an OD gearbox. This is a B/ E body box. The front lever is DOWN, means OD
Uh..........................Uh..............Uh.............................Uh.......................
1:1? What happens if the OP has an OVERDRIVE 4 speed?
There are plenty of online calculators. Google speed gear rpm calculator
You need to know the transmission final ratio, 1:1 in a conventional 4 speed, "point something" if you have an OD that is .73. Don't know if they are all the same for the OD ratio
So you need the above, you need the tire size, and the rear axle ratio. Easy way to determine that is look for a "tag" on the rear axle. BUT THE GEARING MAY have been changed!!!!!!!!
So jack up one rear wheel. Block the front tires, put the transmission in neutral, and release the parking brake. See if you can turn the tire. If you can, watch the driveshaft and turn the tire exactly TWO turns. Count the driveshaft turns. If you have a 2.63, etc ratio, the shaft will turn 2 1/2 turns plus a bit. If you have a 3.23, it will turn 3 and very close to 1/4 turn, etc, etc
IF with the above conditions you CAN NOT turn the wheel, it means you have some form of limited slip AKA "Sure Grip" registered branded copyrighted business trademark of the "we used to be Chrysler Corp now Fiat"
So NOW you must jack up BOTH rear wheels. This time, turn one wheel, and the other should "follow" exactly ONE turn Again, count shaft turns for the rear ratio
HOW DO YOU KNOW if you have a conventional 4 speed or an OD (overdrive)? EASY Stick your head under the car on the driver side so you can see the shift linkage on the side of the gearbox. LOOK AT the front shift lever. If it points up, you have a 4 speed, 1:1 ratio. If the lever points DOWNwards you have an OD gearbox. This is a B/ E body box. The front lever is DOWN, means OD