Trans gear vs. Rear Gear vs. RPM vs. MPH

Attached below is my spreadsheet that shows transmission gear ratios vs. rear end ratios vs. various mph speeds vs. RPM at each speed, and much more.

The data is presented in easy to read tables.

It's a work in progress that I keep updating when I think of other stuff to add.

Enjoy.

Updated 07 Oct 2015 with additional transmissions on spreadsheet and added a .pdf version for easy printout.

Trans & Rear Gear Ratios.xlsx

Trans & Rear Gear Ratios 2015-10-07.pdf

Very nice, that's certainly taking the available data to the next level. I'm a person that likes/uses spreadsheets a lot and I'm impressed.

Thanks Don C. You should see the spreadsheet that I copied this "tab" out of where all the info is linked back and forth so I know which of my cars get which engine, trans, rear, console, hood, seats, etc.

BTW, the original trans gears used on this spreadsheet came from the tire spreadsheet you posted on here.

In a nut shell a good all around rear gear is 3.50:1 for a street driven car with a slightly aggressive intent. That ratio is what I would recommend if I could only recommend one general purpose ratio.

I don't know how I missed this thread; I guess from my being away! LOL

OUTSTANDING job!

BT

Thanks BT. It's all about the first gear ratio and final rpm at 70mph for street driven cars IMHO.

Very nice, it helps quantify the final ratio I'm looking for.

I need to update this thread. I've added some additional transmissions to the list.

Don,

This is a wealth of information - thanks for putting this together and sharing with the group! The spreadsheet showed me my Tremec 3550 / 3.0 set up should be just about right based on the SLR theory !

Butch

Where's the tremecs?

Where's the tremecs?

Click to expand...

The Tremec 3350 is kind of in the middle of the list of transmissions on the spreadsheet.

I updated the original post at the top with a new spreadsheet that contains additional transmissions and also added a .pdf version of the same for easy printing.

Great work, Don!!

Invaluable data analysis... thank you.

My mechanic reviewed all of the data and determined the 2.75 now in my car

is the best rear gear for my setup. This car screams on city streets with the 2.75,

but I still want to try the 3.50 I got from Don.

mike

My mechanic reviewed all of the data and determined the 2.75 now in my car

is the best rear gear for my setup. This car screams on city streets with the 2.75,

but I still want to try the 3.50 I got from Don.

mike

Click to expand...

Go 3.50 and don't look back!!

My mechanic reviewed all of the data and determined the 2.75 now in my car

is the best rear gear for my setup. This car screams on city streets with the 2.75,

but I still want to try the 3.50 I got from Don.

mike

Click to expand...

Go 3.50 and don't look back!!

Click to expand...

I can start off in third gear now. Done it a few times when I missed

first. A little sluggish but moves along.

mike