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Re: [Fot] determining differential ratios

To: "Richard Taylor" <tarch@bellsouth.net>
Subject: Re: [Fot] determining differential ratios
From: "robert bownes" <bownes@seiri.com>
Date: Mon, 20 Oct 2008 19:11:18 -0400
Overdrive comes before the diff. There is no change in the diff, unless, of
course, you have some frankenstein integrated diff/OD, but I don't recall
ever having heard of one on a GT6.


On Mon, Oct 20, 2008 at 5:58 PM, Richard Taylor <tarch@bellsouth.net> wrote:

> ....and suppose you have an overdrive unit?
>
>
> With a locked or welded diff you don't do multiplication by two. I
> find it simpler and more accurate to do ten rotations of the tire--no
> interpolation. 37  output shaft turns vs. 39. Not a lot of room for
> error there. I just had to do it for the Ambro.
> On Oct 20, 2008, at 12:31 PM, Ted Schumacher wrote:
>
> > Bobby, tried to reply last night and not sure if reply got through.
> > Here we go again. Apologies for sending twice if it did get through.
> > This will only work for "open", not welded or limited slip,
> > differential. Put a mark on the pinion (drive shaft) flange and  a
> > mark
> > on one wheel (or tire or brake drum).  Keep the other wheel, tire,
> > etc.from turning. Turn the drive shaft and count the number of turns
> > of
> > the pinion flange needed to get 1 revolution of the tire.  Multiply
> > this
> > by 2 and you have the ratio. Example - just over 2 turns is a 4.1,
> > just
> > under 4 turns is a 3.9, 1 3/4 turns is a 3.5, etc. All you have to
> > do is
> > know what ratios were available.  The example of 1 3/4 turns as a
> > 3.5 is
> > not quite correct. Triumph did not make a 3.5, but they did make a
> > 3.45.  That's one method - no tools, no fuss, no dismantling. Ted
> >
> > Bobby Whitehead wrote:
> >> Forgot to mention... I have several differentials laying around. I
> >> don't have them in the car. I have known and determined I have a
> >> 3:89 locked in the GT6. If I indeed DO have a 4:11 I need to
> >> understand how to figure it out without being in the car.
> >>
> >> Thanks guys....
> >>
> >> Bobby Whitehead
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> >
> >
> > --
> > Ted Schumacher
> > tedtsimx@bright.net
> > http://www.tsimportedautomotive.com
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