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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