A good cruising RPM for a 350 is around 3000, a 28 in tire [9.50 x 15] with
3.38 gear with a 1:1 trans is around 2900 at 70 MPH. I prefer the 3.56 for
all around performance and gas mileage.
Lee
----- Original Message -----
From: "Ed Miller" <enigmaT120@highstream.net>
To: <oletrucks@autox.team.net>
Sent: Thursday, March 18, 2004 6:09 PM
Subject: [oletrucks] Re: Rear end gear ratios
> I haven't heard of those gears for our trucks; my flyer shows 3.70 as an
> option for '58, with the 3.90 as standard.
>
> The standard tires were 6.70 - 15/4PR and the "Maximum" was 7-17.5/6PR.
> I have no idea what those correspond to in our modern tire sizes, but I
> think the 15 and the 17.5 are the wheel sizes. I don't know if a 16 was
> included in the range or not; mine are from a late model 4WD.
>
> With your 350 and a set of 3:38 gears if you can find them, you truck
> will fly. How are your brakes? :-)
> Ed Miller
>
>
> >Great point Ed. I have a pair of 235-70 15's on the back. They only
measure
> >up to 27-1/2". I would imagine a great difference in performance. What
size
> >tires came on the truck new? I wont be changing tires or wheels after
> >investing heavily in the new stuff though. I appreciate your input.
> >Still nobody with the 3:38 gears out there?
> >Darel
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