Gas vs PSD
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
Really? Is that in OD? My '01 with 3.73's is turning around 2K at 70.
Posting Guru
Joined: Aug 2009
Posts: 1,058
Likes: 0
From: emporium
is your truck a 7.3?
7.3 truck with a e40d with 4.10's is turning around 2700 to 3000 rpms at 75
Postmaster
Joined: Apr 2008
Posts: 4,724
Likes: 4
From: Rogersville, TN
Whether it is a 7.3, 6.8, 2.3 or whatever, if it has the same rear end and tranny ratio it is going to be turning the same rpm's at the same speed.
Edit-Dangit JL, you beat me to it lol.
Edit-Dangit JL, you beat me to it lol.
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Posting Guru
Joined: Aug 2009
Posts: 1,058
Likes: 0
From: emporium
i was editing my post to clearify as you guys were posting
and he should have a 4r100 trans. just a beaffed up e40d
Postmaster
Joined: Oct 2006
Posts: 4,171
Likes: 12
From: SE Texas
A 265/70/17 tire, a .71 OD ratio, and a 4.10 axle ratio will get you 2350 rpms @ 75mph .
3000 rpms with that same criteria would be a 5.30 axle ratio.
JL
Postmaster
Joined: Apr 2008
Posts: 4,724
Likes: 4
From: Rogersville, TN
I may be wrong, but I think mine is turning around 2500 rpms at 70 mph. I'll check for sure when I head out for lunch around noon.
Posting Guru
Joined: Aug 2008
Posts: 2,313
Likes: 0
From: Sunny, Snowy, CO
They will if they have different size tires on them...I've seen some trucks with what appears to be 17" at LEAST tires on them...some look like friggin 16's!
Posting Guru
Joined: Aug 2009
Posts: 1,058
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From: emporium
it is. my truck has 265/75r16 with 7.3, 4.10, e40d in overdrive at 75 mph im turning somewere around 2900 rpms. when it had the stock 235/85r16 i believe it was just under that. i dont remeber its been a while but i know it was somewhere in the area of 2700-3000 rpms
Elder User
Joined: May 2010
Posts: 650
Likes: 0
From: WV
Yes, I have an '88 Chevy 1 ton back on the farm in Ohio. Only reason I caught that was because it has a 4.11 in it where as my F150's have had 4.10's.
To bad indeed... although to be honest, I am confident a chevy 1 ton could tow my horse trailer weighing in at 12-13k lbs, just not sure if it could do it as well. But certainly when you start pushing up more (i.e. around 18k lbs) you'll see the difference in trucks. enough of
