Dana rear end help
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Senior User
Joined: Jan 2013
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From: Michigan
Dana rear end help
I need help!! I am trying to figure out exactly what rear axel and gear ratio I have in my 2wd 1975 f350 Supercab. This would be all great and dandy if I had a warranty plate on my truck but I don't. I have tried searching my vin (000000F35JKX01475) everywhere and still haven come up with anything. I think that it is a Dana 70 due to the 70 on the right side of the pumpkin where Dana stamps there model #, but I do not know for sure. I think the ratio is eather 4:10, 4:11, or 4:56 but i need to know exactly what the ratio is. Ill do my best to awnser any questions you guys have.
Thanks in advance!
Thanks in advance!
Lead Driver
Joined: Sep 2003
Posts: 7,016
Likes: 209
From: SoCal
Rover, I think it's sort of the other way around: The number of turns of the drive shaft to turn the raised wheel twice gives you the ratio. The stationary wheel working with the ring/spider/side gears double the effect of the drive shaft.
Laughing Gas
Joined: Sep 2012
Posts: 1,100
Likes: 6
From: Georgia
Yeah, I hate typing on my phone.
I should have ignore the post, or spent the time needed to say it right.
If the vehicle doesn't have limited slip, chock the wheels, jack up one rear wheel and place the axle on a jack stand.
Put the transmission in neutral. Place a mark on both the tire and the driveshaft so that you can count the revolutions.
Rotate the tire 10 times and also count the number of rotations of the driveshaft. For instance, if you make 20 turns of the tire and the driveshaft turns 47 times, the number of driveshaft turns divided by 1/2 of the tire turns (10) equals the approximate ring gear and pinion ratio, 4.7.
If the rear end is limited slip, do it the same way except both wheels need to be off of the ground and turn the wheels half as many times, then divide by the actual number of tire turns.
Haste makes waste.
I should have ignore the post, or spent the time needed to say it right.
If the vehicle doesn't have limited slip, chock the wheels, jack up one rear wheel and place the axle on a jack stand.
Put the transmission in neutral. Place a mark on both the tire and the driveshaft so that you can count the revolutions.
Rotate the tire 10 times and also count the number of rotations of the driveshaft. For instance, if you make 20 turns of the tire and the driveshaft turns 47 times, the number of driveshaft turns divided by 1/2 of the tire turns (10) equals the approximate ring gear and pinion ratio, 4.7.
If the rear end is limited slip, do it the same way except both wheels need to be off of the ground and turn the wheels half as many times, then divide by the actual number of tire turns.
Haste makes waste.
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