You might want to considerat the target speed. For example, if you would
like to go 70 mph at the same rpm that you are currently going 55, the
formula:
gear ratio = (4.11 * current speed) / desired speed
could be used as follows:
gear ratio = (4.11 * 55) /70
= 226.05 / 70
= 3.229
So a 3.23 or thereabout would cause you (with no other changes) to travel at
70 mph at the same rpm as you currently achieve 55 mph.
Plug in different values to decide what gear to choose. Hope this helps
Kirk Pierce
1957 Chevrolet stepside
-----Original Message-----
From: Ronald I. Givens <givens@hal-pc.org>
To: oletrucks <oletrucks@autox.team.net>
Date: Tuesday, June 11, 2002 5:02 PM
Subject: [oletrucks] Fw: rear end 355 or ?
>----- Original Message -----
>From: Ronald I. Givens
>To: old-chevy-truck
>Sent: Tuesday, June 11, 2002 4:24 PM
>Subject: rear end 355 or ?
>
>
>Howdy,
>I have a 1951 GMC Suburban (4800 pounds) 248 motor, 411 rear end, original
>four speed. Can anyone tell me if I should go to something other than a
355,
>I'm told I will only gain 15% in speed with a 355, in other words 55 to
64mph,
>not that I plan to go faster than 65, but wouldn't it be better to slow the
>motor down even more. What is the next gears 338, 311, 243, ? It does not
>seem that I'm gaining much. Understand I'm not hot roding, just stock, on
the
>road, every day. I've got someone that sets up rear ends every day, to put
it
>in for me, I'm just trying to know which way to go, before I spend this big
>bucks. If there are better gears to go for, who do I buy them from...
>Is 355 best thing to do?
>thanks for any info
>ron givens
>Houston, Texas
>oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
|