[Jim B]

OffRoad Calculator

Speedo Converter
Find new Gear Ratio with new tire size
Find Overall Crawl Ratio
Find MPH
Find RPM
Convert P-Metric tire to Tire Diameter inches

Power Conversions by PowerStream.
Convert Watts to Amps
Convert Amps to Watts
Convert Volts To Watts
Convert Watts to Volts

If anyone has anymore that are different, let's post up the Links!

[sempergumbyTJ]

RTI ramp calculator
Speedo Gear calculator This is for the gear in the T-case. Very helpful.

These should be helpful.

[Rollbar]

Gear Ratio Chart

Jeep Vehicle Re-Call Info & Tech Bulletins

[SuperDave1984]

Nice. But what do the numbers mean? I understand the gear ratio and the tire size numbers, but the numbers in the middle, what are they exactly?

[Rollbar]

superdave1984, on Dec 21 2006, 02:01 PM, said:

Nice. But what do the numbers mean? I understand the gear ratio and the tire size numbers, but the numbers in the middle, what are they exactly?

Look @ the color chart,

1. Hwy-Yellow-Hwy Driving.
2. Daily Driver-Blue-Best Overall Performance.
3. Towing & Power-Poor Fuel Economy.

P.S. The numbers are the RPM's the engine is turning.

[YJWhenUCanTJ]

Quote

spin the driveshaft?

raise up the axle so the tires are off the ground, put the x-fer case in neutral, tranny in neutral. mark the bottom of one of the tires. Spin the driveshaft and count the number of revolutions of the driveshaft it takes to turn the tire one revolution. that will get you a good estimate of your gear ratio.

for example, if you have to spin the driveshaft 3.5 times for the tire to make one revolution, your gear ratio is probably 3.55:1. If it takes you 4 turns plus just a hair, 4:10:1. HTH

[Rollbar]

Dave, I remember having to spin the tire twice to get the correct #, unless that just to get it more exact instead of adding the drive shaft spin for one revolution.

[Jim B]

Gear Ratio Determination

[Joe Dillard]

Rollbar, on Jan 25 2007, 01:51 PM, said:

Dave, I remember having to spin the tire twice to get the correct #, unless that just to get it more exact instead of adding the drive shaft spin for one revolution.

That's correct. If the diff is open, or unselected if it's a selectable locker, you'll need to rotate the tire twice to get the correct ratio.

If it has an auto locker or working LSD, one rotation will do the trick.

[rpmustang]

Here are a few that I have used.......
www.csgnetwork.com/automotiveconverters.html
www.5speedtransmissions.com/techref.html
www.gearsareus.com/gear%20talk.htm

[TranyDoctor]

my personal favorite

http://www.4lo.com/calc/gearratio.htm

[BustedKnuckl]

Good Automatic Transmission References

[Rollbar]

Jeep VIN Decoder sites.

Jeep VIN Decoder 1.64

Not sure on the accuracy but some of you can test and report.

1961-1993 Vin Decode for Equipment
Vin Decode for Equipment

Jeep Vin Info Up to 2004 for TJ, XJ, YJ, CJ, WJ
Jeep Vin Info for listed Models.

In combination with vin correctness and some of these links, maybe equipment info can be had.

Not sure how good these will work but try it and let us know.

This one you have to download.
Dirt Road Jeep Vin Decoder

This one is on line and is good from 1982-2005 for all of Chrsler.
Allpar Vin Decoder

Jeep VIN Reference Guide

[Rollbar]

Speedometer Gears & transmission parts to help you convert to your larger tires

[BustedKnuckl]

State Lift Laws (curtesy of Rough Country Suspensions)

State Lift Laws

[Rollbar]

CJ Engine Index Information. Very good information to read up on & this will answer a lot of questions.

[Jim B]

With regards to RTI Calculations on Post#2.

Here is how to do it manually with a carry me calculator.

Ramp Travel Index is based on climbing a 20 degree ramp with one tire while keeping the trailing tire in line.
At the point where any tire begins to lift into the air is where it's calculated.
The distance of up travel up the ramp without losing contact with the ground.

1. Measure from the bottom of the ramp to the center of the bottom of the tire (use a plumb from the hub to find center or some type or right angle).
Measure from the leading edge of the ramp to the center of the hub on the ramp.

2. This distance traveled in inches is divided by the wheelbase in inches and multiplied by 1000.

What this gives you is a percentage of travel up the ramp in relation to your wheelbase.

For instance, if a vehicle with a wheelbase of 94"s, travels 62"s up the 20 degree ramp, then the RTI would be calculated as:
62" divided by 94" x 1000 resulting in a score of 659.

[Rollbar]

AMC Engine Codes

AX-15 Service Manual

Jeep TH-400 Jeep Transmission Manual

Jeep T-176 Tranmission Info

Tie Rod Flip Kit Install

[lvelez]

Tire Size Calculator

Gives lots of info and lets you see a tire comparison.

[Jim B]

I have personally updated the RTI Ramp Calculator that I loaded on the Web. The one that is there now is not updated.

If anyone wants my updated file (has a few more fields with personalized information for the ramp driver) that you can load in any Win OS Computer and print to any printer.... Private Message me. You do not need to be connected to the Internet to run this.

It will cost you dinner for two.

[coonbuster]

here is a gear ratio calculator to calculate you final crawl ratio


Final Crawl Ratio

[Jim B]

coonbuster, on Dec 1 2008, 05:57 PM, said:

here is a gear ratio calculator to calculate you final crawl ratio

Final Crawl Ratio

I have a spreadsheet .xls that I've been using for a very long time that asks tire size, gear ratio, TC and Tranny on each gear and it gives you a nice print out but it's very basic. You must know this information though.

This calculator that you posted is much nicer and complete in that it takes now stack configuration and it gives you a drop down menu for the different Trany/TCs out there. Nice find

[JeepNWilly]

Here is one for the oldies I found in www.earlycj5.com

[Rollbar]

Updated tire size to lift ratio.

Go HERE.

[Jim B]

I came across these two sites that have complete downloadable Service Shop Manuals.

Needed one for the Dodge Diesel. Looked at the Jeep Manuals and they had quite a few.

The PDFtown link files were corrupt so I had to go to the User-Manual.org and got it. Could have been a bad upload.

User-Manual.Org

PDFTown.Com