You're talking about a stock waterboxer 4 speed ?
If that's the case it'll work fine.
Both a waterboxer and a 1.9TD AAZ are 5,000 rpm engines, more torque sooner
in the TD engine, but very similar rpm range.  
Given what you'll be spending anyway, you don't need another new expense
just yet.
And I would always say do any  engine conversion, drive it for a few months
at least in all conditions, then consider if you need slightly different
gearing.

If you have a stock 4 speed 82 diesel vanagon trans, yes, you need a better
trans than that !
But the 5 speed 83 diesel transmission is fine, 4 speed water boxers would
be fine, syncro gearing would be fine, and so would a DK 4 speed from an 80
to 82 air cooled vanagon.  

AAZ 1.9TD's have been around in the vanagon world since about ..........late
90's, 95 at the earliest.  Many many of them have been done. Nothing new or
unusual about an AAZ at all.
I notice the flyer says 'rebuilt' 1.9 TD AAZ's
Also, that mileage .........28 to 30 I think they say........it's capable of
that for sure, but that won't be the overall par fuel mileage.   27ish is,
with 25.5 being  the lower end of the scale for 'normal good fuel mileage'
with one of those. They'll touch 30 to 31ish in optimal conditions and
driving. 
I don't get the one engine picture that shows silver header pipes, with a
two into one collector.  Doesn't look like there's a turbo on the engine,
and the exhaust pipe would come out of the turbo of course, and not two
pipes, but one.   Those are possibly non-turbo gas pipes set under the
engine for the shot perhaps.  

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Rob
Sent: Friday, February 08, 2008 7:43 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Tiico TD

At  2/8/2008 01:36 PM, William Seward wrote:
>>Tiico has a 1.9TD  Diesel Conversion for Vanagon, 28 - 30 mpg,  Bio-
>>diesel ready!
>>
>>http://tiico.com/Diesel%20conversion%20page.htm
>>
>>eat your heart out.

Bio-diesel, yes! I'd much rather drive my food than eat it.
I need to do some more reading at the Tiico site and see if the stock
transmission will work.

Rob
becida@comcast.net