Date: Thu, 12 Mar 2009 18:33:36 -0700
Reply-To: mark drillock <mdrillock@COX.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: mark drillock <mdrillock@COX.NET>
Subject: Re: transmission types vs codes
In-Reply-To: <20090313012042.5C06F2331B8@pop1.cfu.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Yes, making just top gear way taller without also adjusting the next
lower gear up has downsides. With Syncro trannys we actually have a
taller 2nd available too. This lets us raise 4th, 3rd and 2nd to keep
the spacing more reasonable as we go higher. None of this is cheap however.
On 4 speeds 1st and 2nd are machined as one with the mainshaft so they
can't be individually changed. On 5 speeds 1st, 2nd, and 3rd are part of
the mainshaft. Syncros have a second choice of mainshaft with a taller
2nd so raising 3rd and 4th works better.
Note that these parts are getting pretty hard to find. Rumor has it a
major high end West Coast Vanagon business has bought up much of the
supply of tranny parts to do custom work with, leaving the rest of us
behind.
Mark
Max Wellhouse wrote:
> I had Weddle(when they were still doing Vanagon trannies and before I
> knew about Dayro) put a used 4.57 R/P in my 90 GL and also a .77 4th
> gear. Wish I had spent the extra $250 and gotten a taller 3rd gear
> too. I can wind it up to 60 in 3rd with a pretty much stock 2.1, but a
> little taller would really be nice on 2 lane roads to be able to throw
> it in 3rd and pass even pokier traffic than myself. The stock 3rd/.77
> 4th has an rpm drop off of about 1400 rpm. Maybe not a problem with a
> Subie or ZTec, but with stock it took some getting used to. With stock
> Agilis tires, the tranny runs a true 70 mph at 3400 rpm That part I
> really like.
>
> DM&FS
>
> At 08:00 PM 3/12/2009, mark drillock wrote:
>> They are the same internally except for the ring & pinion ratio. The DM
>> has a 5.43 ratio while the DK has a 4.57 ratio, both having the same
>> gears R,1-4. The DK would give much lower engine rpms at the same road
>> speed. The external case is also different with the DK having a stronger
>> casting.
>>
>> Mark
>>
>> AD Felder wrote:
>>> I have a type 091 4-speed transmission in my 82 westy diesel.
>>> According to Bentley, this would have the code letters DM. The
>>> aircooled also had a type 091 transmission, but with code DK. What
>>> is the difference between these two transmissions, and especially,
>>> the parts within 'em?
>>>
>>>
>
>
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