treyZ28

with a 4.8? 4.11

NeverSatisfied02

iTrader: (12)

What about an RCSB 5.3 auto? 3.73, 3.90, or 4.10?

95ImpSS

iTrader: (2)

It all depends on what you're after... DD, moderate driving, or WW?

Send me an email. I've got a spreadsheet that calculates speed vs. rear gear vs. tire/wheel size. This has given me an idea as to what I'm goin with on my C10.

My Yukon (5.3L w/ 4L60E) came with 3.42s, and my calcs confirm. My C10 came with 2.73s, but am gonna go with 4.10s. RPMs with the Yukon's 3.42s dial in at 1800 (@ 70mph). At 78mph, it's right at 2000RPM. Having 4.10s in my C10 with the same drivetrain should put me at 2400RPM (@ 70mph). My C10 won't be driven on the daily basis, but maybe on my 50 mile (one-way) commute once or twice (at the most) per week. It'll definitely be my weekend warrior.

treyZ28

www.f-body.org/gears

treyZ28

depends no your tire size, but the 5.3 is MUCH torquier than the 4.8

It doesn't need gear to stay alive. The 4.8 was all rev.

TurboGibbs

iTrader: (6)

If you had a 4.10 gear in the 5 speed it would be like having a 5.10 gear in the 4L60E, first gear comparison. I didn't pull those #'s out my ***, those are calculated. I personally thought that the 3.73's were fine with my stock 4.8 and 31.5" tires. Any shorter tire and it would have been way too low of a gear. Now my 3.73's just suck!

treyZ28

sounds perfect to me.

What is the 5th gear ratio?

TurboGibbs

iTrader: (6)

5th is just .82 in the Tremec TR-3450 but it is around .7 in the NV3500. The .82 is just another reason to not go with a really low gear.

NeverSatisfied02

iTrader: (12)

Well on mine, i have the 5.3 with the 4l60e and 3.42 and my current tires are 275/60/16 Toyo's.

I am about to be running 265/35/22's though. What would be a good gear for either?

LS1TRUCKGUY

iTrader: (7)

Im Runnin A 373 Posi In My Rcsb 5.3 With Toyo 275/60/16 And It Is Perfect.