RPM's at 65?
 

Whats are you guy's RPM's at 65 with what gears and what size tires?

p.s. new sig pic...gotta love Burt Gummer.http://www.websmileys.com/sm/fingers/fing02.gif

With my 325/60/18's and 3.73 gears, I am running right around 1800 rpms @ 65.

Found this in the Self-help Aisle :D

http://www.oly4x4.com/gearratios.htm

This is for 1:1 ( no OD). For rpm in OD, apply the OD reduction correction factor [4th = 0.70:1]

You'll need basic math skills, though :lol:

Fun with numbers :beers:

bubba

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same for me, or pretty close, I have 305/60R18's though.

I never looked at 65 but at 70 im at 1850ish. Same size tires.

http://www.grimmjeeper.com/gears.html
Pick tranny (4r75w or 4r75e same ratios)
Pick any transfercase (doenst matter when not 4x4ing)
pick gears
pick tires
scroll down and at the bottom it has RPM vs MPH

I have never looked at 65, but at 75, I am running dead on 2000 rpms. 5.4, 3.55LS, 265/70/17.

At 73 mph I'm reving 2000 bang on.
373's here with 275 70 17's.

At 65 mph I'm reving right around 1800 rpm.

36" tires.... 3.73.... @65mph about 1450ish `

With a .70 final drive on the 4R70W trans, 36" tall tires and 3.73 gear ratio, at 65mph your engine would be turning EXACTLY 1585RPM. I use a handy little calculator my friend made, here's a link:

http://www.cvsr.net/gearhead.html

1584.1 :D !

Running stock 18s with stock tires (only 9000 miles on the truck) and my RPMs are right around 2000 when running between 70-75. (who actually drives the speed limit at 65, besides old ladies?):thumbsup:

Well I drive around 80 and my rpm's are dead on at 2000. I just thought 80 was a little fast for some of you old timers!

Did you miss all my gear post? :confused: All I do is 80 and I was right at 2k dead on too.

I'm turning 1560 @ 65 mph. 295/70R17 (33x12) with 3.55 gears. I know this isn't the optimal setup for these tires but I like the low rpms on the highway.