Is there a math problem for this conversion?I want see how many Rpm's = 1 mph for 1st,2nd,3rd and 4th gear with a 3.73 gear and my 4l60e trans....This info will greatly be appreciated.....Thanks

 

http://wahiduddin.net/calc/calc_speed_rpm.htm

 

Great info fast377 ,there is just one problem ,I dont know the ratio's of the trans gears

 

1st 3.06, 2nd 1.75, 3rd 1.00, 4th 0.70

 

could be this though
1st 3.059, 2nd 1.625, 3rd 1.000, 4th .0696, Reverse 2.294

either one should get you what you want

 

Thanks now it does ask my what my loaded tire radius is.I have Nitto's 275/40r17 they are 25.4 inches tall.so how do I get the loaded tire radius from that? Thanks for the help....

 

A tire's static (not moving) radius is only accurate while the vehicle is stopped. A static loaded radius is typically about 44% of the static loaded diameter. As the vehicle speed increases, centrifugal force causes the tire to grow taller. This force will increase the tire's dynamic (changes while moving) radius. At 45 mph, most tires will have a radius that is very close 48% tire's static loaded diameter. This growth will increase with vehicle speed and can actually exceed half of the tires static loaded diameter. The static loaded diameter is NOT the same thing as an static unloaded diameter. The static loaded radius of a tire is usually less than half of the tire's diameter.

44% at 0-10 mph = 11.176
45% at 10-20 mph = 11.43
46% at 20-30 mph = 11.684
47% at 30-40 mph = 11.938
48% at 40-50 mph = 12.192
49% at 50-60 mph = 12.446
50% at 60-70 mph = 12.7
51% at 70-80 mph = 12.954

 

According to the documentation that comes with a Hypertech programmer, F-body, 3.73, A4, Stock Tire Height.
1st 1 MPH = 149 RPM
2nd 1 MPH = 79 RPM
3rd 1 MPH = 49 RPM
4th = ?

 

Not to split hairs, but....

Using the stock PCM's tire height of 24.9", this is what I get:
1st - 154RPM
2nd - 82RPM
3rd - 50RPM
4th - 35RPM

 

1 thing to remember... w/an auto, unless the converter is locked up, none of the RPM to MPH numbers will correlate

 

I remember the hypertech book and those numbers do look right from what I remember.Thanks horist I will just have to log a graph with HPT and see where its at...Thanks for all the help guys....

 

Efilive software does this for you automatically.

When you are in a page that has mph tables in it, at the bottom it will tell you the rpm at which it will happen.