| Re: [GMCnet] New Manny Tranny on hills [message #195357 is a reply to message #195355] |
Thu, 10 January 2013 15:14   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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I can run 75 mph and not overrev my 403. It is less than 3600 rpm with the
3:70 final drive at that speed. I consistently run in the 3200-3400 rpm
range when travelling. The 403 seems to be really happy at that rpm. If I
am not bucking headwinds, I consistently get better than 10 miles per
gallon.
Jim Hupy
Salem, Or
78 Gmc Royale 403
On Jan 10, 2013 12:53 PM, "A." <markbb1@netzero.com> wrote:
>
>
> James Hupy wrote on Thu, 10 January 2013 14:48
> > Darryl, given the 403's lack of torque below 48-50 mph, I usually
> manually downshift at about that speed if the top of the upgrade is not in
> sight.
> > But with the 3:70 final drive gears, my 403 will not lose speed on
> anything less than a 6% grade. It is the best performance upgrade that you
> can make for the money spent.
> > Jim Hupy
> > Salem, Or
> > 78 Gmc Royale 403
> What we need is a two-speed FD. One ratio for climing hills and another
> for flatland with a tailwind.
> --
> '73 23' Sequoia
> UA (Upper Alabama)
> "Time is money. If you use YOUR time, you get to keep YOUR money."
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