Hi Jamie.

One other way to increase speed is to lower the rear springs a bit
and run bigger tires on the back end. The transmission is not the
only place you can affect engine RPMs at speed.

I can't wait to see diesel vanagons running around with the rear
wheel arches radiused for huge tires like they used to do to split-
window buses in the bad old days.

Happy Trails,

Greg Potts
1973/74/77/79 Westfakia "Bob The Tomato
www.pottsfamily.ca
www.busesofthecorn.com

On 20-Jun-07, at 7:46 PM, Jamie Auch wrote:

> David,
> Most of the folks that are doing the diesel conversions are also
> modifying the transmissions to bring down the rpms.  It's not a
> good idea (for longevity) to consistently rev a diesel engine. From
> the research that I have done and the opinions of people who do
> this for a living, it's best to cruise a diesel engine at 3400 max.
> The only way to modify the automatic transmission is to get a
> 3.73 ring and pinion instead of the 4.06.  Unfortunately these are
> difficult to find and pricey!  I know, I have almost all the
> stuff needed to convert my '89 automatic to a 1.9 Turbo Diesel.
> Unfortunately for me, I rode in Ben's Tornado Red Subaru at
> Busfusion and I might have changed my mind.
>
> Jamie
> The Kooky Math Teacher
>