If it is posi and both wheels turn the same as you rotate one wheel the
just count the number of times the drive shaft goes around in one
revolution with both wheels off the ground 1 to 3.73 or 1 to 4 plus a
fraction = 4.10
If the opposite wheel turns in a different direction then the one you are
turning put one wheel on the ground and rotate the one wheel alone in
neutral and double the drive shaft rotations for the one rev of the
wheel. 1.5+ a little =3.08 a little less then 2 rev = 3.73 close to 2
rev = 4.1 good luck works in pinch the best is to check the ring to
pinion teeth ratio. Ed ke6bnl So. Calif.
On Thu, 1 May 2003 14:53:59 -0600 "mr55gmc" <mr55gmc@attbi.com> writes:
> You wrote
> From: "Brad Kahler" <brad.kahler@141.com>
> To: <oletrucks@autox.team.net>
> Sent: Thursday, May 01, 2003 3:50 AM
> Subject: [oletrucks] diff ratio - donor rear end
>
>
> Is it possible possible to tell the diff ratio on an 81 1-ton
> dually by vin number, or some other number stamped on the
> truck?
>
> Worst case is I jack up the rear end and count revolutions but
> it sure would be nice to just find the numbers somewhere!
>
> Thanks
>
> Brad
>
> Back in that era I sold trucks - the axle ratios were primarily 3:73
> or 4:10.
> Even the emission settings affected the ratios, but the little white
> tag with
> all the funny numbers usually inside the glove box lid should show a
> couple
> starting with "G" - GQ1 being a "standard axle ratio" if memory
> serves me
> correctly. Then there is at least one other number starting with G,
> such as
> GT4, which a parts man can quickly interpret. If there is a G80,
> you lucky
> devil, it is a locking rear axle. There are also numbers on the
> rear axle
> tube, passenger side, about even with the driveshaft entry level,
> that will
> also decode on parts. If not, pull the rear cover and count the
> teeth.
> Sandy Pierce
> Salt Lake City, Utah
> 55-2 GMC Suburban P/U
> oletrucks is devoted to Chevy and GM trucks built between 1941 and
> 1959
>
>
+++++++++++++++++++++++++++++++++++++++++++++++++
Ed ke6bnl@juno.com ( 1950 f1 & 1963econo pu
Agua Dulce Ca. 91390 70 chevy S/B) 1948 Ford
F3
So. Calif. 70 mil N.Eof Los Angeles 1953 Chevy pu 3100)
+++++++++++++++++++++++++++++++++++++++++++++++++
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