Hi Gary,
By my calculations your overall ratio in 4th will be 4.1811,  a 2wd with .85
4th and 4.86 diff will give you 4.131.
The same ratio for all intents and purposes.
This is indeed a simpler and cheaper way than changing the diff ratio!(ANY
091 boxes are as rare as hens teeth in this part of the world).
My interest is I have a '82 transporter that was originally powered by a
1600cc air-cooled engine (avail in Europe, don't know about North America).
This also has a 5.43 diff  but 0.82 4th as stock.
I am in the process of putting in a 2.3 Audi engine, and have calculated at
118kph (68mph) the engine will be turning 4000rpm, a bit high for my liking.
I will investigate the different 4th ratio for the box I am rebuilding at
present. Maybe find a source in Australia, as at present exchange rates
parts from the US become veeeery expensive.
Thanks and regards for the info.
John.
New Zealand.

----- Original Message -----
From: "Gary2a@telusplanet.net Gary" <gary2a@telusplanet.net>
To: "John P" <jmp@bt-pacific.co.nz>
Cc: "vanagon mail list" <vanagon@gerry.vanagon.com>
Sent: Thursday, October 19, 2000 03:42
Subject: Re: Regearing transmission

>
> ----- Original Message -----
> From: "John P" <jmp@bt-pacific.co.nz>
> To: "Gary Lee" <gary2a@TELUSPLANET.NET>; <vanagon@GERRY.VANAGON.COM>
> Sent: Wednesday, October 18, 2000 9:03 PM
> Subject: Re: Regearing transmission
>
>
> > What ratio 4th did you use?
> >
>
> Stock 4th in an 1987 syncro is 0.85
> I put in a 0.78
>
> My Syncro 094 AAN box has a 5.43 final drive ratio.  (Canadian version)
> This is higher than 091 2wd boxes.  For example, a 1986 DU has a 0.85 4th
> and a 4.86 final drive ratio.
> So putting in a taller 4th in the syncro makes it closer to the 2WD.
>
> Correct me if I'm wrong here.
>
> Gary Lee
> Calgary, Canada
>
>
>