Gear Ratio??
#1
#3
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
#4
#7
#10
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.
The following users liked this post:
cumminscontrol (02-27-2011)