Date: Sat, 11 Sep 2010 12:34:21 -0700
Reply-To: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Subject: Re: semi-urgent auto transmission question
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re
but the shift points seemed a little lower than before."
there's one external adjustment that affects shift points ..
the length of the rod from throttle lever on side of trans to throttle body.
might ask if that was changed or adjusted.
other than that, for shift points I think of governor.
wouldn't hurt to suck a little ATF out of the filler tube.
one auto trans shop I had work on a volvo auto trans of mine, had a nifty
little home made glass bottle and tube arrangement ..
they just taped into engine vaccuum to get the suction ..
and you pull out say, a couple inches of ATF into the bottle.
I doubt being overfull a tiny bit is causing your problems ...but overful
can be a very bad thing and it's better to be sure .
I have a hunch the shop might be wondering themselves what is going on.
they are pertty fmaiiar with vanagon automatics ?
I'm kinda shocked that 'modern' shops and technicians can be almost baffled
by a simple old vw bus...
the vanagon.
One guy in colorado had his 2WD vanagon in for a smog test on rollers ...the
smog tech thought it was front wheel drive ..
that is being pretty clueless, or not looking in the lists I'm sure they
must have that tell how to test each type of US model car or van.
gets a bit scary. I would say it's worth it to send the trans to a
transmission rebuilding shop that does a lot of them. German Transaxle in
Bend OR is sure one.
to give you an idea of their level of expereince or expertise, I was working
on a vanagon that just would not shift up into 3rd.
The van's owner didn't want to put real money into fixing it, so went for
cleaning, inspecting, looking at the valve body etc. In that process,
taking to German Transaxle ..
found out that they sell rebuilt Valve Bodies....but here is the impressive
part - they have a dyno to test them on.
and when you read in Bentley how to set up little adjustable spring
tensions in the valve body relative to hydrualic pressure ...you start
seeing it gets pretty complicated.
like the valve body is a Anologue Computer really ...
takes inputs, makes decesions, has outputs .....tricky darn part.
my point is, without expereince and fancy equipment like that ..I suspect
that some trans rebuilding shops figure to replace worn parts, and things
should work as they did before ..
which may not really be the case always.
anyway, hope someone gets it figured out !
Personally, I'd check the differential oil level and CV joint screws ..
Iv'e seen all kinds of things done wrong by shops ..it's almost normal.
scott
www.turbovans.com
----- Original Message -----
From: "Edward Maglott" <emaglott3@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Saturday, September 11, 2010 10:39 AM
Subject: semi-urgent auto transmission question
> Got my 86 van back a week or so ago after a transmission rebuild that
> has been a saga. I will cover that in more detail at some
> point. The short version is that the rebuilder had the van twice,
> and for a long time both times.
>
> When I got it back a week ago the trans was working better than I've
> ever experienced in a vanagon. But then I've only had basically worn
> out transmissions in mine. So over the 100 miles or so I've driven
> it since I got it back, it has developed a problem when cold. Today
> I start the van, let it idle about a minute and back up my driveway,
> which is uphill. Fine. Put it in D and hear/feel nothing. Step on
> the gas and it revs freely up to about 2500 then the van takes off
> with a thud. For about the first block, it felt like it was maybe
> slipping or was in 2nd gear instead of 1st. After that it drove
> normally, but the shift points seemed a little lower than before.
>
> I think this symptom has to do with the trans not properly developing
> pressure when cold? I've had the slipping in R when cold symptom
> before this rebuild so I'm a little surprised it went up the driveway
> so well in R and then didn't engage D.
>
> Checking the fluid level, it seems a tiny bit high. Probably about
> 1/8" above the top mark based on checking it hot, many times, and
> parked on different "level looking" places to try to get a good
> reading. Could this be a factor?
>
> I was planning on taking a trip for about a week in the next few
> days. Probably 1000 miles or less. I can deal with the symptoms I
> have now but don't know if it will get worse or damage something
> inside worse. Opinions?
>
> Edward