Mombu the Chevrolet Forum sponsored links

Go Back   Mombu the Chevrolet Forum > Chevrolet > 2001 2500HD auto trans heating up
User Name
Password
REGISTER NOW! Mark Forums Read

sponsored links


Reply
 
1 17th January 05:05
kenneth pierce
External User
 
Posts: 1
Default 2001 2500HD auto trans heating up


When towing a fifth wheel or carrying a camper my Silverado seems to be
overheating the tranny, even though these loads are well within the rated
capacity of this truck. The tranny temp gauge shows about 190F when the fan
starts to engage I understand there is some kind of "protective mode" for
the transmission when it gets too warm. The dealers I have talked to don't
seem to have knowledge of how this works. Recently there was a kind of
ringing noise (an extra noise) in the area of the tranny when I stopped
after a hot day of carrying the camper up and down hills, though the noise
was not there the next morning. I am wondering if others have had similar
experiences and how concerned I need to be. Thanks.
  Reply With Quote


  sponsored links


2 17th January 05:05
jonathan race
External User
 
Posts: 1
Default 2001 2500HD auto trans heating up


I have a 2004 Chevy 2500HD with the Allison tranny and I can tell you that
when towing a heavy trailer throught the NC mountains 180-190F tranny temp
was normal. My tranny gauge usually runs 120-150F here in FL while driving
around town during the day (stop-and-go), but I had no problems at 180-190F
in the mountains last week while towing in the heat with a total weight of
4000+ lbs.

If you believe you are having issues, check with Allison's web site for
technical info on the 1000 series tranny, plus a filter change couldn't hurt
either (easiest thing to do on this tranny with the external spin-on
filter).

Cheers - Jonathan
  Reply With Quote
3 17th January 05:06
transurgeon
External User
 
Posts: 1
Default 2001 2500HD auto trans heating up


once more

biggest cooler that will fit behind the grille

bypass the radiator cooler

if you're really serious, use a mix of Dex3 and MobilOne 5w20 synthetic
engine oil (50-50)
  Reply With Quote
4 17th January 05:06
kenneth pierce
External User
 
Posts: 1
Default 2001 2500HD auto trans heating up


P.S. I should have mentioned that it is the 3 speed plus OD tranny, not an
Allison. When the temp nears 200 the fan engages and there is a loss of
power. Truck has 56K with normal maintenance at 30K.
---Ken>
  Reply With Quote
5 17th January 05:06
whitelightning
External User
 
Posts: 1
Default 2001 2500HD auto trans heating up


what engine? How heavy is the camper? I ask which engine as the fan will
pull
some power when it kicks in. Also confused by what you mean by 56K with
"normal" maintenance at 30K.
Whitelightning
  Reply With Quote
6 17th January 05:06
transurgeon
External User
 
Posts: 1
Default 2001 2500HD auto trans heating up


how many have you run with the mix in it ?

(deafening silence to follow)................
  Reply With Quote
7 17th January 05:06
jonathan
External User
 
Posts: 1
Default 2001 2500HD auto trans heating up


My '04 2500HD with the Allison already has a huge external transmission oil
cooler. Are you suggesting that he bypass the factory external cooler and
put in an aftermarket unit, or did you just not realize that it already had
one?

Cheers - Jonathan
  Reply With Quote
8 17th January 05:06
transurgeon
External User
 
Posts: 1
Default 2001 2500HD auto trans heating up


yes, but does HIS 01 2500 have an Allison or a 4L80E ???????
  Reply With Quote
9 17th January 08:51
snoman
External User
 
Posts: 1
Default 2001 2500HD auto trans heating up


The "power" the cooling fan uses is the least of your concerns when
towing heavy loads, only its cooling performance is important.

--
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/Chevrolet-2001-2500HD-auto-trans-heating-ftopict131414.html
Visit Topic URL to contact author (reg. req'd). Report abuse: http://www.autoforumz.com/eform.php?p=639949
  Reply With Quote
10 17th January 08:51
snoman
External User
 
Posts: 1
Default 2001 2500HD auto trans heating up


It is EXTREMELY foolish to bypass your built in cooler but some think
they know more because of a name. The tank cooler helps stabilze your
tranny temps and keep the range of temp swing a lot narrower because
you tranny will work better and last longer with a more constant temp.
If you follow the advice to bypass cooler completely, you will have a
sluggish tranny in cold weather and possible reduce cooling in cold
weathewr as well because the thick oil will have considerable more
drag and resistance to flowing thru a big cooler when cold. Also, when
you try to dump all of the tranny heat completely in front of radiator
with a BIG cooler you will reduce A/C effectiveness because air
reaching it will not be virgin and it will be hotter and it will
reflect back to engine cooling to and a added restriction to airflow
path too. Even the warm tank water can cool the tranny fluid some and
since the tank water circulates rapidly on a hot day it will still
cool oil some without effecting engine cooling as much as a full
bypass. The correct way to do it is tank first then aux cooler and if
your temp are at or under 200 towing there is no cause for concern at
all. I have a 26 year old THM400 that has had a very hard life with a
small aux cooler after tank cooler and it still works like new and a
16 year 700R4 with 173k and same setup and it still works like new to.
I have been if cars with too big a cooler or a full bypass too and
they do not fuction well in cool and cold weather.

--
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/Chevrolet-2001-2500HD-auto-trans-heating-ftopict131414.html
Visit Topic URL to contact author (reg. req'd). Report abuse: http://www.autoforumz.com/eform.php?p=640216
  Reply With Quote
Reply


Thread Tools
Display Modes




Copyright 2006 SmartyDevil.com - Dies Mies Jeschet Boenedoesef Douvema Enitemaus -
666