[T3] 2026 Invasion Updates...

[William Hoyer]

I was racing the Formula Vee and used the Prussian blue & disassembly
several times method and trying to get minimum drag. Used Internationa
Harvester really light trans oil in the trans. In those days, late 60s,
synthetic oil was not available. Measuring, as I recall, wasn't too hard.
The IH oil that was about 10 weight worked great but as you said was not
trying for 100,000 miles.

Bill

On Mon, May 18, 2026, 7:46 AM Jim Adney <jadney at vwtype3.org> wrote:

> Adjusting the ring & pinion is actually the most difficult part of a
> tranny
> rebuild. Doing that the VW way takes very expensive VW special tools and a
> fair amount of time. There's no easy workaround. Most places will just
> ignore
> the nuances and drop them in, which I suspect is why it's common for them
> to hum.
>
> You CAN do the R & P with Prussian Blue, the old fashioned way, but that
> takes understanding, a huge dose of patience, and lots of disassembly &
> reassembly, until it's right. Most people will just throw it together and
> call it
> good. That works, if you're just reinstalling the original parts or
> replacing
> bearings only, which have VERY accurate dimensions.
>
> OTOH, getting the R & P exactly right is only important if you're hoping
> to
> get 100,000 miles out of it. For most people, if you're racing or building
> a
> dunebuggy, you're never going to see even 10% of  that, so good enough is
> good enough.
>
> To assemble the gearbox, you can sacrifice a tranny case, cutting access
> holes in it to allow final in-situ adjustment. That's what I've done. Note
> that
> there are early and late tranny cases, with minor internal differences. I
> had
> to make carefully dimensioned "shims" to allow the case I had to work for
> both.
>
> I've forgotten the differences: Either a late case will work for both
> styles, or
> the other way around. I only had one case available and it was the "wrong"
> one, so I had to make shims, which I surface ground to the exactly equal
> thickness to offset all the parts equally.
>
> Jim
>
> On 17 May 2026 at 18:52, William Hoyer wrote:
>
> > I agree with you. That's why I take trans to Tim who has all of the setup
> > for them. When I was racing Vee's I reversed the ring & pinion but didn't
> > get into the gears. Axles and things like that are easy but you really
> > need the proper setup to get the internals right.
>
>
> --
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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