I heard of another method: tape a string to the driveshaft, roll the vehicle
forward one revolution of the tire ( both tires ), then count the number of
wraps the string makes around the driveshaft. that
number to 1 , ie 3.5 to 1. Let me guess 78 El Camino - 3.08:1 or 2:73:1
ROGER GLEASON wrote:
> Ok, did as terry has stated below...Held the right wheel turn the
> left one revolution and the driveshaft yoke rotates one and a quarter
> revolutions...Held left... turn right... same results...What gives
> here? I thought the ratio stood for turns in relation to 1 as in
> 3.56:1, or 4.11 to 1 as examples... in this case it would be 1.25 to
> 1 or 1.25:1 yes/no? How so? this rear came from a '78 el'Camino SS.
> This does not sound right to me. I'm going to pull the cover anyway to
> replace the backing plates so I will check the number of teeth on the
> Ring & pinion. It is not a posi or limited slip... What gives
> Rogerg
> 51-3100 AD Stocker
>
> > From: Terry Stellman <stellman@noex.com>
> > To: "'ROGER GLEASON'" <rogerg@maverick.facil.uconn.edu>,
> > "Truck List (E-mail)" <oletrucks@autox.team.net>
> > Subject: RE: [oletrucks] Trucks:Rear End Ratios
> > Date: Tue, 16 Feb 1999 12:15:48 -0600
> > Reply-to: Terry Stellman <stellman@noex.com>
>
> > Unless it's a positraction rearend, just jack up one side so that one wheel
>remains in contact with the ground. Then slowly turn WHEEL one revolution
>while you count the number of revolutions the dr>
> >
> >
> > Terry Stellman
> > 1949 3600
> > Missouri City, Texas
> >
> >
> > -----Original Message-----
> > From: ROGER GLEASON [SMTP:rogerg@maverick.facil.uconn.edu]
>
> > Subject: [oletrucks] Trucks:Rear End Ratios
> >
> > I saw a thread a while back about how to determine rear gear ratios
> > without having to pull off the cover...Is there a way.? I looked
> > thru the archives but could not find the article...When I spin the
> > pinion one complete 360* revolution the axle turns 4/5ths of one
> > revolution.
> > If I pull the cover i could count the teeth on both the ring and the
> > pinion then what?
> > If I divide the ring by the pinion i am gonna get 1.08? something...
> > if I divide the pinion by the ring i will get .08? something.
> > DUH ! I can't believe I forgot how to do this...
> > I can't believe I can spin the pinion one turn and get 4/5 of a turn
> > from the axle shaft.
> > Rogerg
> > 51-3100 AD Stocker
>
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