I wouldn't do that myself..
but if I wanted a 'shift tightening up' additive I'd put in Trans-X.

in any case ..you are probably on borrowed time.
and besides..
in transmission issues, when they are old and have symptoms..
sometimes, the longer you wait, the more expensive , or even impossible
to do, the rebuild is.

Used ones are risky too, unless you see them driving nicelyfirst.
Even left to sit a long time..a tired old one that was working may not
when tried again.BTDT.

I could use btw....good working used transmissions ...
one good auto for an 86.
one good DK.
a good waterboxer 4 speed.

I just took an auto trans core to German Transaxle recently ...
it was pretty much not a rebuildable core - an expensive propositionfor
sure.

On 6/30/2013 8:02 AM, Jim Ogul wrote:
> Earlier I posted the issue I'm having where my Westy won't upshift to 3rd
> until its warmed up (about 2.2 miles)  I found a thread on the Samba
> suggesting switching to F type AT fluid. hHs anyone here tried that for an
> ailing AT and did it help?
>
> Jim
> 85 Westy
>