Hey strangers...I've been busy as heck the last couple of weeks between the holidays, driving & sleeping , and website work...sorry for not contributing more.

Lately, I have spent some time developing three calculators that you might find useful at some point.

1. an RPM calculator for the 4R100 transmission

You enter (in the yellow boxes):

• your rear axle ratio
• your tire width (mm)
• your tire aspect ratio
• your tire size (inches)
• the desired speed which you want to determine RPM for

The calculator will return:

• your RPM in each gear of the transmission

2. an MPH calculator for the 4R100 transmission

You enter (in the yellow boxes):

• your rear axle ratio
• your tire width (mm)
• your tire aspect ratio
• your tire size (inches)
• the desired RPM which you want to determine MPH for

The calculator will return:

• your MPH in each gear of the transmission

3. a tire size/gearing calculator

You enter (in the yellow boxes):

• your current and new tire sizes (width,aspect & size)

The calculator will return:

• current/new tire sidewall height (inches)
• current/new tire radius (inches)
• current/new tire diameter
• current/new tire circumference
• current/new tire width
• current/new tire revolutions per mile
• the differences for all the above (inches & percentage)
• the changes in speedometer reading from 20 to 100 mph
• the engine RPM's for gear ratio's from 2.35 - 5.13 @ 65 MPH with the new tires

The link is located on the 7.3RHN website, on the Guides, Maintenance & Mods page (at the bottom of the Guides subsection). I suspect that someone will find some errors, so PM me if you do and I will work on fixing them. I hope you find the calculators useful.

 

Now THAT will be useful... very good Neil, and for everyone else, thank you, Jim and JD for all you have done for this site.

 

i tried to rep you Neal but the Rep Police have me in the pokey right now!!! Thanks!

 

Thanks guys...I added a couple of screen shots to the original post.

 

I just added the info for the ZF-6 standard transmission to the calculators.

 

I tryed to rep you too for all your work on the site, but I have to spread it around first..

 

I've redone the tire and gearing calculator (page 3). It now will compare your current tires against stock (265x75-16) and against any other size tire you might like to enter.