J

jonkuehn

Guest

• Jul 28, 2005

• #1

Working on a 1995 GMC fullsize van, 4L60e tranny shifts up and down between
drive and od at speeds above 45 mph. Shift is quick and harsh, and happens
every minute or two. With shifter in d, van drives ok. Is tranny bad or?
Thanks

 

P

Peter D. Hipson

Guest

• Jul 28, 2005

• #2

What are the MIL codes? Without that you don't know why it is
ahppening. Possibly a bad TPS.

On Thu, 28 Jul 2005 07:46:53 -0400, "jonkuehn" <nospam@sbcglobal.net>
wrote:

>Working on a 1995 GMC fullsize van, 4L60e tranny shifts up and down between
>drive and od at speeds above 45 mph. Shift is quick and harsh, and happens
>every minute or two. With shifter in d, van drives ok. Is tranny bad or?
>Thanks

 

J

jonkuehn

Guest

• Jul 28, 2005

• #3

What are MIL codes? Jon

 

P

Peter D. Hipson

Guest

• Jul 29, 2005

• #4

Malfunction codes. Much like ODBII codes, but they are only two
digits.

On Thu, 28 Jul 2005 18:56:25 -0400, "jonkuehn" <nospam@sbcglobal.net>
wrote:

>What are MIL codes? Jon

 

S

SnoMan

Guest

• Jul 29, 2005

• #5

"jonkuehn" wrote:
>Working on a 1995 GMC fullsize van, 4L60e tranny shifts up and down
>between
>drive and od at speeds above 45 mph. Shift is quick and harsh, and
>happens
>every minute or two. With shifter in d, van drives ok. Is tranny bad
>or?
>Thanks

Does it vary with higher speeds and throttle application? Also are
you sure it is tranny shifting gears or the torque converter clutch
locking and unlocking under load?

--
Posted using the http://www.autoforumz.com interface, at author's request
Articles individually checked for conformance to usenet standards
Topic URL: http://www.autoforumz.com/4X4-1995-van-4L60E-shifting-trouble-ftopict131063.html
Visit Topic URL to contact author (reg. req'd). Report abuse: http://www.autoforumz.com/eform.php?p=638246

 

J

jonkuehn

Guest

• Jul 29, 2005

• #6

It seems to shift down to direct, then right back up to overdrive. It is
not sensitive to throttle position or speed above 45 mph all the way to 65
mph it acts the same. How do i get the MIL codes out? I am a diesel
mechanic for a readymix concrete company and the van belongs to one of the
drivers. I realy don't know alot about the newer electronic control
systems. The problem started slowly, and has increased in frequency over
about the last 50 miles. Thanks for the help, Jon.