mahana79

02-16-2006, 12:36 PM

This give a new outlook on things instead of finding the standard crawl ratio.

http://www.4x4help.com/resources/calculators/final-ratio.htm

I did mine at 1000 RPM instead of 750. just a little more realistic to trail speed.

Drivetrain:

Tracker Auto 1st: 2.40 3rd: 1.00 Reverse: 2.00

Toy range box: 2.28

Dana 300: 2.62

R&P: 4.10

37" tires

results without factoring in Torque Converter multiplication

Calculation Results

Forward Crawl Ratio: 58.78022 to 1

Forward Movement @ 1000 RPM: 2.74655242432547 Feet per second

Reverse Crawl Ratio: 48.98351 to 1

Reverse Movement @ 1000 RPM: 3.29586342253555 Feet per second

Highway Speed @ 2000 RPM: 53.6949976449363 MPH

Results factoring in a 2.5 torque multiplication from the converter (note: TCI says most torque converters give a torque multiplication of 2.5 at intial start so I multiplied first gear and reverse by 2.5 and use those numbers, I didnt change 3rd gear because at cruising speed the torque converter balances out at a 1:1)

Calculation Results

Forward Crawl Ratio: 146.9505 to 1

Forward Movement @ 1000 RPM: 1.09862134047941 Feet per second

Reverse Crawl Ratio: 122.4588 to 1

Reverse Movement @ 1000 RPM: 1.31834506100726 Feet per second

Highway Speed @ 2000 RPM: 53.6949976449363 MPH

http://www.4x4help.com/resources/calculators/final-ratio.htm

I did mine at 1000 RPM instead of 750. just a little more realistic to trail speed.

Drivetrain:

Tracker Auto 1st: 2.40 3rd: 1.00 Reverse: 2.00

Toy range box: 2.28

Dana 300: 2.62

R&P: 4.10

37" tires

results without factoring in Torque Converter multiplication

Calculation Results

Forward Crawl Ratio: 58.78022 to 1

Forward Movement @ 1000 RPM: 2.74655242432547 Feet per second

Reverse Crawl Ratio: 48.98351 to 1

Reverse Movement @ 1000 RPM: 3.29586342253555 Feet per second

Highway Speed @ 2000 RPM: 53.6949976449363 MPH

Results factoring in a 2.5 torque multiplication from the converter (note: TCI says most torque converters give a torque multiplication of 2.5 at intial start so I multiplied first gear and reverse by 2.5 and use those numbers, I didnt change 3rd gear because at cruising speed the torque converter balances out at a 1:1)

Calculation Results

Forward Crawl Ratio: 146.9505 to 1

Forward Movement @ 1000 RPM: 1.09862134047941 Feet per second

Reverse Crawl Ratio: 122.4588 to 1

Reverse Movement @ 1000 RPM: 1.31834506100726 Feet per second

Highway Speed @ 2000 RPM: 53.6949976449363 MPH