Date: Wed, 25 Mar 2020 15:26:08 -0700
Reply-To: David McNeely <davmcneely40@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: David McNeely <davmcneely40@GMAIL.COM>
Subject: Re: Auto trans not upshifting
In-Reply-To: <4E9D2023-257D-4801-AB7D-7409726565F2@comcast.net>
Content-Type: text/plain; charset="UTF-8"
Lots of messages come to me only after one or more replies. I don't know
what is going on with that.
mcneely
On Wed, Mar 25, 2020 at 3:19 PM Eric Caron <ericcaron96@comcast.net> wrote:
> I’m glad Dennis answered as the original question didn’t come to my inbox
> or junk mail.
>
> And, I follow AT transmission discussions!
>
> Eric Caron
>
>
>
> > On Mar 25, 2020, at 6:08 PM, Dennis Haynes <d23haynes57@HOTMAIL.COM>
> wrote:
> >
> > From a design perspective I find it amazing that this simple automatic
> transmission works as well as it does regardless of fluid temperature and
> related viscosity. Since it works well cold this is not an adjustment
> issue. As shift points and the inner working rely on pressure what is most
> likely happening is that you have an internal leak or the pump is
> worn-damaged and once the fluid is warm you don't have sufficient pressure
> for the valve body to do what is needed or you can't lock up the direct
> clutch.
> >
> > You can do some diagnosing with a pressure gauge. The Bentley has the
> details. You can also drop the valve body and using an air gun with rubber
> tip operate each of the clutches and 2nd gear brake band. Were you the
> person that had the shafts come out with the torque converter? Could be the
> seal rings on the turbine shaft are broken.
> >
> > Drop the pan and check that the filter is clear. A restricted filter can
> also cuase shift propblems. If it is clogged enough to be a problem an
> overhaul is inevitable anyway.
> >
> > Dennis
> >
> >
> > -----Original Message-----
> > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
> Of Bill Marshall
> > Sent: Wednesday, March 25, 2020 12:42 PM
> > To: vanagon@GERRY.VANAGON.COM
> > Subject: Auto trans not upshifting
> >
> > Hi folks, my AT is acting up. It shifts fine when cold, but when warm
> will not upshift to 3rd at all. I recently removed and installed it, but
> did nothing to it as far as adjustments go.
> > Could it be the shifter cable shifted? Kickdown too tight/loose? Any
> ideas would be appreciated. Thaknks.
> >
> > Bill Marshall
> > 88 GL auto
>
| 
