transmission woes - Chevy and GMC Duramax Diesel Forum
Transmission Shop Discuss the Allison OEM, aftermarket, and the ZF-6.

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 13 (permalink) Old 11-25-2012, 10:54 AM Thread Starter
Junior Member
 
Join Date: Sep 2011
Posts: 80
transmission woes

I have a 2001 Duramax with 230K miles on her. I purchased her with 220K and she runs great. I had to replace the injection pump, but other than that, she has been a solid truck. My only Mod's are a Stealth 2 programer I usually run in the economy mode or 50hp.

Today, I was driving home from work and I thought my truck was slipping in the 1-2 shift with mild acceleration...normal driving. Once I got off the freeway and came to a stop, the truck downshifted really hard at say, 5mph or slower. I was not sure if it was a fluke or what? So I tried to slow down to a stop again. It did it again... Now, when I come to a stop, it slammes into what feels like a granny gear. What gives?

For now, I plan on checking the tranny oil and recalibrate my Stealth 2 programmer for my stock settings, then put the tranny in learn mode...maybe this will help?

ANY HELP would be greatly appricated.
Raiden is offline  
Sponsored Links
Advertisement
 
post #2 of 13 (permalink) Old 11-25-2012, 11:35 AM Thread Starter
Junior Member
 
Join Date: Sep 2011
Posts: 80
OK, my transmission oil is full and is clean. I re-set the tune back to the economy mode and calibrated my transmission to my 33 inch tires and stock 3.73 rear end gears. I took her out for a drive & she's driving with out any issues. I can't reproduce the slamming into gear at low low speeds while comming to a stop. I know the tranny takes about 75 miles to "relearn" so I'll have to wait and see.

Anyother thoughts, help or advsie?

Thanks
Raiden is offline  
post #3 of 13 (permalink) Old 11-25-2012, 12:04 PM
Senior Member
 
RobsDmax's Avatar
 
Join Date: Sep 2011
Location: Ontario
Posts: 613
any codes showing??

2003 Chevy LB7 RC/LB Red
EFI By Kory - MBRP Duals - Bills Intake - Amsoil and John Deere Synthetics Throughout

2003 Chevy LB7 CC/SB Black - Cheap Hooker
EFI By Kory - Stacked Stacks - AFE Intake - Work Stock Puller

2002 GMC 4.8L RC/LB Beige - Cheap Stripper
EFI By Me - Soon To Be Single Turbo
RobsDmax is offline  
post #4 of 13 (permalink) Old 11-25-2012, 12:06 PM
Vanned this place
 
TheStepChild's Avatar
 
Join Date: Feb 2010
Location: Michigan
Posts: 8,123
Moved to trans area

Quote:
Originally Posted by Jeremy Clarkson View Post
Some say he was conceived in a cargo van
TheStepChild is offline  
post #5 of 13 (permalink) Old 11-25-2012, 12:17 PM Thread Starter
Junior Member
 
Join Date: Sep 2011
Posts: 80
Sorry about that....


No codes and she is running fine now?

What Allison transmission do the 2001 2500 LB7 duramax have? I"m considering either rebuilding mine &/or finding one in the junk yard and then rebuilding it. Where can we get a rebuild kit for our transmissions?

Thanks
Raiden is offline  
post #6 of 13 (permalink) Old 11-25-2012, 12:36 PM
Senior Member
 
RobsDmax's Avatar
 
Join Date: Sep 2011
Location: Ontario
Posts: 613
hm surprised it didnt throw codes, it has the allison 1000 and if you are looking to get it rebuilt to handle more power get in contact with mike l.

2003 Chevy LB7 RC/LB Red
EFI By Kory - MBRP Duals - Bills Intake - Amsoil and John Deere Synthetics Throughout

2003 Chevy LB7 CC/SB Black - Cheap Hooker
EFI By Kory - Stacked Stacks - AFE Intake - Work Stock Puller

2002 GMC 4.8L RC/LB Beige - Cheap Stripper
EFI By Me - Soon To Be Single Turbo
RobsDmax is offline  
post #7 of 13 (permalink) Old 11-25-2012, 03:57 PM Thread Starter
Junior Member
 
Join Date: Sep 2011
Posts: 80
RobsDmax,

I"m considering looking for a spare tranny in a bone yard, then rebuilding it myself. Do you have any idea of what could be going on with the transmission? I"m supprised it did not throw any codes. It only did it 4 times. I did it once, then I reproduced it three times on my way home. From there, I checked the oil and re-calibrated the tranny via my stealth 2 programer and set my tune to economy mode.

Also, what will it cost to have someone rebuild my tranny?

Thanks
Raiden is offline  
post #8 of 13 (permalink) Old 11-25-2012, 04:02 PM
Senior Member
 
RobsDmax's Avatar
 
Join Date: Sep 2011
Location: Ontario
Posts: 613
ya not a bad idea, i would talk to mike for a kit to use on the build. not sure what would cause that. when did you last change the spin on??

2003 Chevy LB7 RC/LB Red
EFI By Kory - MBRP Duals - Bills Intake - Amsoil and John Deere Synthetics Throughout

2003 Chevy LB7 CC/SB Black - Cheap Hooker
EFI By Kory - Stacked Stacks - AFE Intake - Work Stock Puller

2002 GMC 4.8L RC/LB Beige - Cheap Stripper
EFI By Me - Soon To Be Single Turbo
RobsDmax is offline  
post #9 of 13 (permalink) Old 11-25-2012, 06:03 PM Thread Starter
Junior Member
 
Join Date: Sep 2011
Posts: 80
I had the transmission serviced @ a dealer when I purchase it 8K miles ago. I don't think they changed the spin on filter, but flusehd the old fluid and replaced it with new fluid.

Where can I get a spin on and what is the part number?

Thanks!
Raiden is offline  
post #10 of 13 (permalink) Old 11-25-2012, 08:07 PM
DuramaxForum Enthusiast
 
rd05lly's Avatar
 
Join Date: Mar 2011
Location: Missouri
Posts: 2,505
Try cleaning and greasing the slip yoke on drive shaft. Drop drive shaft lube spline and yoke might help.


Sent from my iPhone using AutoGuide.com Free App

05 CCSB EFI Live by PPEI
2011 Chevy Tahoe
04 Olds Alero DD
76 Dodge Charger SE
https://www.syntheticmotorsports.com
rd05lly is offline  
Sponsored Links
Advertisement
 
Reply
Gear in this thread - Powered by O'Reilly Auto Parts

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevy and GMC Duramax Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome