I'd look into the 700R4 auto O/D. I think the final ratio (fourth) is abt
.73 to 1. So a 4.11 rear end would give you a final ratio of abt 3.03 to 1.
And you can lock out O/D when you need to. Make sure the unit you get has
the updated parts. GM used some aluminum parts which didn't last. I think
any recently rebuilt unit will be upgraded, but check. Bob K.
----- Original Message -----
From: "The Botelers" <boteler@olg.com>
To: "Larry Cornett" <larry@cornett.net>; <oletrucks@autox.team.net>
Sent: Tuesday, December 16, 2003 9:38 PM
Subject: Re: [oletrucks] gear ratio
> Larry,
>
> I believe the Turbo 400 is still just 1:1 in High gear, which is the same
as
> your 4 speed so there won't be any gain in speed or economy. I order to
> archive those you need to change the engine final drive speed/rpm by
adding
> Overdrive or changing rear ratio or increasing the tire diameter (a lot!).
>
> There are formulas on-line where you can play with different numbers,
> allowing you to see the results they each have.
>
> Regards,
>
> Mike Boteler
> '56 4400 Stake
> '56 6400 Stake
> '56 8400 Wrecker w/Holmes 525
> '56 9200 Tractor w/Allison Automatic
> '57 10500 Fire Truck
> Hughesville, MD
>
> ----- Original Message -----
> From: "Larry Cornett" <larry@cornett.net>
> To: <oletrucks@autox.team.net>
> Sent: Tuesday, December 16, 2003 10:06 PM
> Subject: RE: [oletrucks] gear ratio
>
>
> > Thanks all,
> > Yes I just raised one wheel and it is not posi.
> >
> > I have a 65 3/4 ton with a 350 engine that has a 4 speed with a granny
> > low. I do not have a tach but it sounds like 3500 rpm at 50 mph. I like
> > the manual tranny but am considering installing a 400 turbo tranny for
> > highway speeds and economy.
> > Perhaps I could just change the rear end ratio and get what I need
> > without the hassle of the automatic. Any suggestions on a good ratio?
> > Larry
> >
> > -----Original Message-----
> > From: Andrew Roberts [mailto:arobs@u.washington.edu]
> > Sent: Tuesday, December 16, 2003 5:48 PM
> > To: Larry Cornett
> > Subject: Re: [oletrucks] gear ratio
> >
> > Hi Larry,
> >
> > I'm guessing this was tested with only one wheel off the ground, right?
> > If so, you accurately measured the number of driveshaft turns needed to
> > turn one of the rear wheels one revolution. To turn both rear wheels,
> > you'd have to turn the driveshaft twice as far, so multiply 2.05 by two
> > to
> > get 4.10, which is really close to the common ratio of 4.11:1. You most
> > likely have 9 teeth on the pinion and 37 on the ring.
> >
> > Hope this helps,
> >
> > Andrew Roberts
> > 1949 3600
> > Shoreline, WA, USA
> >
> > On Tue, 16 Dec 2003, Larry Cornett wrote:
> >
> > > Date: Tue, 16 Dec 2003 12:26:22 -0800
> > > From: Larry Cornett <larry@cornett.net>
> > > To: 'Oletrucks' <oletrucks@autox.team.net>
> > > Subject: [oletrucks] gear ratio
> > >
> > > Can someone smarter than me tell me what my gear ratio is if it takes
> > > approximately 2.05 revolutions of the drive shaft to turn the rear
> > tire
> > > one full revolution?
> > > Thanks,
> > > Larry
> > >
> > >
> >
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> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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