My car had a TH350 before i yanked it out with about 27.5" tires. I dont remember what the RPMS were at on the highway but it was high. I couldnt imagine having 4.10/4.11 gears with the TH350 it would make road trips unbearable and extremely expensive.

I do on the other hand wish i went with 4.11s with my 4L80 in my new setup and i havent even drove it yet.

 

Here's a link to a calculator to estimate rpm's with different tire and gear ratio setups. Go down to the one that's titled "Find RPM". You can skip the one that reads "TransCasRatio" or put 1 in it.
Tire/Gear Calculator

 

How accurate is that calculator? I just tested it and it said I'd be cruising at 193 RPMs with 3.23 rear gear, 26.6 inch tall tires at 65 with my 4L60 (OD is .070). And I know I'm not at that with my 2.73 stock gears!

Edit: If I do OD with .7 instead of .070 like it should be, it brings me up to 1856 rpms, which sounds bit more realistic. I'm not sure why work has the OD listed at .07 and not .7. You can't take away a zero if it's in front of a number!

 

.7 is the factor you want to use.
.7 (.70) is 70/100 or 70 % (divide bottom number into the top to get your decimal), which is the final drive of your trans.

 

That only works if the zero comes after the 7 (as such .70). You can just drop the zero from that mentally or divide by a 100 like you did. But the final drive for the trans is listed as .07 (decimal zero seven, or seven hundredths).

I don't get why they'd list it as .07 when it's .7. They're two different numbers which would throw someone (like me) off at first. I'll have to alert the guys that put our APAL system together and have it changed. It's like '93 'Vette ZR1. APAL has it listed as a OHV engine when it was DOHC. It sucks I have nothing to do at work and find simple mistakes like this...

 

Where is the final drive of the trans "listed" as .07?

 

The electronic catalog we have at work. It's telling me the 700R4, 4L60, and 4L60E all have 3.06 1st gear, 1.63 2nd gear, 1.00 3rd gear, .070 4th gear. Shouldn't it read .7 instead of .07?

 

Yes it should. That .07 is a big bumbling boo-boo, baby!

 

So I'm not crazy. Good. I'll let them know so they can fix it. That's the nice thing about Advance, they do whatever it is they can to provide the most accurate information to us so we can give the customers the best advice and products. Theirs no BSing things.

 

Well....... I don't know that I'd go so far as saying that!