transmission shifting problem, computer related? - Great Lakes 4x4. The largest offroad forum in the Midwest

Go Back   Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Chevy Tech
GL4x4 Live! GL4x4 Casino

greatlakes4x4.com is the premier Great Lakes 4x4 Forum on the internet. Registered Users do not see the above ads.
Search
Reply
 
Thread Tools Search this Thread
Old January 24th, 2013, 08:11 PM   #1
jeepjumper
Does not own a jeep...
 
jeepjumper's Avatar
 
Join Date: 08-12-11
Location: Indianapolis, IN
Posts: 1,259
iTrader: (2)
Mentioned: 0 Post(s)
Default transmission shifting problem, computer related?

I have a 2000 silverado w/ 5.3 4L60E combo. The tranny was rebuilt with at least a shift kit but I have no idea what else is in it. At in town speeds (45 mph and lower) it shifts flawlessly. During high way speeds it has no problem until I get on it, it wont down shift till I'm under 55 mph. The computer think I have 265/75R16's but I have 285/75R16s on it. Is this enough to throw it off like that? Also my speedometer is dead on.
jeepjumper is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old January 25th, 2013, 10:34 AM   #2
Klumpper
Fuck Cancer!
 
Join Date: 08-26-09
Location: Howell
Posts: 459
iTrader: (17)
Mentioned: 1 Post(s)
Default

Shifting algorithms in that body style truck did lots of adapting to driving style. My mom's 2000 Burban with the same drivetrain was a turd like that until the battery was pulled overnight and then driven like it's meant to.

If you're not downshifting at WOT at highway speeds, something's wrong, as it should be engine rpm vs throttle position to control shifting, and maybe some engine load based stuff (rusty off the top of my head).

Did it do that before the rebuild?
Klumpper is offline   Reply With Quote
Old January 25th, 2013, 08:58 PM   #3
jeepjumper
Does not own a jeep...
 
jeepjumper's Avatar
 
Join Date: 08-12-11
Location: Indianapolis, IN
Posts: 1,259
iTrader: (2)
Mentioned: 0 Post(s)
Default

Quote:
Originally Posted by Klumpper View Post
Shifting algorithms in that body style truck did lots of adapting to driving style. My mom's 2000 Burban with the same drivetrain was a turd like that until the battery was pulled overnight and then driven like it's meant to.

If you're not downshifting at WOT at highway speeds, something's wrong, as it should be engine rpm vs throttle position to control shifting, and maybe some engine load based stuff (rusty off the top of my head).

Did it do that before the rebuild?
At WOT and high way speeds it sometimes down shifts but only one at max (to 3rd or 4th IDR how many gears the 4l60e has)

The transmission was rebuilt about 50k ago, before I purchased it.
jeepjumper is offline   Reply With Quote
Old January 25th, 2013, 09:03 PM   #4
jeepjumper
Does not own a jeep...
 
jeepjumper's Avatar
 
Join Date: 08-12-11
Location: Indianapolis, IN
Posts: 1,259
iTrader: (2)
Mentioned: 0 Post(s)
Default

Also, I bought it from a guy who was defensive driver, I am mostly all aggressive (live in the middle of Indianapolis, there's no other way to drive.) Could the huge change in driving styles have thrown the computer off?
jeepjumper is offline   Reply With Quote
Old February 6th, 2013, 07:32 PM   #5
Cili
Newbie
 
Join Date: 10-19-12
Location: Sidney mi
Posts: 18
iTrader: (0)
Mentioned: 0 Post(s)
Default

I think you just need to stop driving like a girl.
Cili is offline   Reply With Quote
Old February 11th, 2013, 01:19 PM   #6
Klumpper
Fuck Cancer!
 
Join Date: 08-26-09
Location: Howell
Posts: 459
iTrader: (17)
Mentioned: 1 Post(s)
Default

Only a 4 speed trans. Yes, driving defensively vs offensively will significantly impact the shifting algorithms in that era truck. I'm unsure of the exact speed it locks out 2nd gear, but at 55-65 it will probably take EVERYTHING in the pedal to get to 2nd gear, especially if the P.O. drove with a feather on the go pedal. It's in the wind if the truck has ever been reprogrammed too.

When it downshifts at 55mph, what engine speed is it running before/after the shift??
Klumpper is offline   Reply With Quote
Old February 16th, 2013, 05:19 PM   #7
jeepjumper
Does not own a jeep...
 
jeepjumper's Avatar
 
Join Date: 08-12-11
Location: Indianapolis, IN
Posts: 1,259
iTrader: (2)
Mentioned: 0 Post(s)
Default

I keep forgeting to get more accurate data on when it shifts, the only thing I can think of it my drivers front wheel speed sensor is bad, but would that make my trans. shift wrong?
jeepjumper is offline   Reply With Quote
Old February 19th, 2013, 09:09 AM   #8
Klumpper
Fuck Cancer!
 
Join Date: 08-26-09
Location: Howell
Posts: 459
iTrader: (17)
Mentioned: 1 Post(s)
Default

Front wheel speed sensor shouldn't make the trans act up.

Try unplugging the battery over night, the combination of differing driving styles, the trans rebuild probably using non-stock parts (causing it to learn something goofy), and the oh so not spectacular learning feature of them probably left it with a bad taste in its mouth.

One car i've worked on required the battery be pulled once a month so it didn't shift like it was a built to the gills turbo 400. 2000 Bonneville.
Klumpper is offline   Reply With Quote
Old February 19th, 2013, 05:51 PM   #9
jeepjumper
Does not own a jeep...
 
jeepjumper's Avatar
 
Join Date: 08-12-11
Location: Indianapolis, IN
Posts: 1,259
iTrader: (2)
Mentioned: 0 Post(s)
Default

I've done it once, it didn't seem to help, but next week its getting parked (car pooling) so I'm ganna leave the batt. unhooked all week maybe that will do something???
jeepjumper is offline   Reply With Quote
Old February 19th, 2013, 05:57 PM   #10
montecarlo33
The Violator
 
montecarlo33's Avatar
 
Join Date: 08-23-07
Location: Otsego County 49735
Posts: 4,617
iTrader: (19)
Mentioned: 4 Post(s)
Default

Quote:
Originally Posted by jeepjumper View Post
I've done it once, it didn't seem to help, but next week its getting parked (car pooling) so I'm ganna leave the batt. unhooked all week maybe that will do something???
it will reset the computer if left unhooked for long enough, and yes that will make the computer "relearn" its habits.
montecarlo33 is offline   Reply With Quote
Old February 20th, 2013, 10:35 AM   #11
RADRICK
Senior Member
 
RADRICK's Avatar
 
Join Date: 04-28-09
Location: Galien, Mi
Posts: 458
iTrader: (7)
Mentioned: 0 Post(s)
Default

You can have someone with a GM Tech 2 scanner clear out the shift adapts, then you can drive it how you would like to learn the shifting habits.
RADRICK is offline   Reply With Quote
Reply
Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Chevy Tech

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 02:10 PM.


Powered by: vBulletin, Copyright 2000 - 2012, Jelsoft Enterprises Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
Page generated in 0.15367 seconds with 55 queries