Gear Ratio??
Tell what gear ratio I have? I looked at the window sticker and it says that I have the locking diff but no ratio is stated there. I know at 70mph the rpm is at 1750. Its a six speed auto 2011 2500 4x4
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My guess is you have 3.73 gears. My 07 runs about the same rpm for that speed
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my cousin showed me a trick in his mustang that a performance dealer told him to do to see what rearend he had...since that car is a 5spd they said to drop it in 4th, run it up to 73 mph and see what the rpm's say...it was settin dead on 3, which would make it a 3.73...i tried it in my truck, the one in my sig, it bein 6spd, i dropped it in 5th ran it up to 73, and there it was...sittin on 3 on the tach....hope this helps ya....never knew it myself til then
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What size tired do you have
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Sorry I should have posted tire size. They are 265-75-17. Thanks for the replies
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best way to know for sure is to lift the rear end, turn the tires 1 full turn, and count the revolutions of the driveshaft
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If you have your list of options and you have DMEP that means 3.73 gear ratio.EJT=cummins DG7=6-speed auto.Im not sure of the codes for other ratios.I know that GM has all codes on a sticker on the glove compartment door but not sure if Dodge does the same.
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should have a tag on one of the bolts on your diff cover also if it hasnt been apart and left off
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Thanks for all the replies. 3.73 it is.
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Originally Posted by cumminscontrol
(Post 704274)
my cousin showed me a trick in his mustang that a performance dealer told him to do to see what rearend he had...since that car is a 5spd they said to drop it in 4th, run it up to 73 mph and see what the rpm's say...it was settin dead on 3, which would make it a 3.73...i tried it in my truck, the one in my sig, it bein 6spd, i dropped it in 5th ran it up to 73, and there it was...sittin on 3 on the tach....hope this helps ya....never knew it myself til then
here's a formula for the OP. rpm=(mph x gear ratio x 336) / tire diameter Final drive on a 68RE is 0.62 btw. RPM=(70x0.62x3.73x336)/31 RPM= 1755 so at 70mph with 3.73's and 31" tires should be running about 1755 RPMs. Sounds about right. |
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