Truck Forum - Truck Mod Central Black Bear Performance

Go Back   Truck Forum - Truck Mod Central > LET'S TALK TRUCKS! > TMC TECHNICAL > Mechanic's Corner

Sponsored Ads
Register to remove these ads.

Mechanic's Corner

Strange 4/Low No-Shift Problem


This is a discussion on Strange 4/Low No-Shift Problem within the Mechanic's Corner forums, part of the TMC TECHNICAL category!
Originally Posted by rfdean Good news and bad news... I have confirmed that the reason the transfer case was not ...

Need help? Have mechanical questions? Post 'em here.

User Tag List

Like Tree5Likes

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  Go to top #21 (permalink)  
Old 08-20-2016, 09:02 AM
Black02Silverado's Avatar
 
 
Real Name: Nick
Join Date: Jul 2009
Location: Half way between here and there.
Posts: 20,363
Vehicles
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by rfdean View Post
Good news and bad news... I have confirmed that the reason the transfer case was not shifting into 4low was because the N on the PRND123 would not light. After shaking wires and establishing some kind of connection, N lit up, so I managed to solve my original problem and the problem which is the subject of this post. I shifted into neutral, pressed 4low button, the lights flashed, I felt and heard a slight yet distinctive clunk sound. I pressed on the gas and could feel a distinctive difference in the way the truck felt after a foot or so (a little tighter?) so I thought I was good to go, and that it was in 4 low, but after about 4 or 5 feet, I heard a very loud clunking/grinding like the gears were bouncing around and not fully engaged. I immediately put it back into neutral, it made the grind/clunking noise again for a second but stopped when i got out of drive, and I was fortunately able to switch it back to 2 hi, and the truck drives...

I don't have any experience with 4wd except for what I had just done last night, so I may just be tripping on some normal 4wd noise, but I'm not convinced because it sounds really bad. From what I can tell, it may be the front differential, a wheel bearing?, or something in the transfer case. Not really sure where to go from here except for replacing fluid in the front differential. I already replaced the fluid in the transfer case a few months back with the blue stuff...
Well if it drives fine in 4WH with no noise then it more than likely is the Tcase. So that is where I would start. Changing the fluid in the front diff is easy, pull the fill plug, to make sure you can get it out, then the drain. Put drain plug back in and fill until fluid drips out of fill plug. Make sure you are sitting on a level surface.
__________________
AMSOIL Synthetic Lubricants & Filtration Systems, Click Here
Wholesale pricing available!


Click the image to open in full size.
Reply With Quote
  Go to top #22 (permalink)  
Old 08-20-2016, 07:57 PM
Draenor's Avatar
KILL ALL HUMANS!!!!
  
 
Real Name: John
Join Date: Jun 2009
Location: Now in Scott,LA
Posts: 6,241
Vehicles
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Have you checked it for any transmission codes?
__________________
04 2500HD Whippled 2.3
Reply With Quote
  Go to top #23 (permalink)  
Old 08-23-2016, 11:48 AM
I'm NEW... What now?
 
Join Date: Jan 2016
Age: 49
Posts: 5
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
shaking wires

Did you determine the actual location of your bad connection or just left it alone after it started working?
__________________
X
Reply With Quote
  Go to top #24 (permalink)  
Old 08-25-2016, 11:23 PM
I'm NEW... What now?
 
Join Date: Aug 2016
Age: 39
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
I never determined the location of the loose connection. I just left it alone... After reviewing the manual, I think 4 hi is all i will ever really need. I plan to check for codes whenever I change the differential fluid, but at this point I'm not complaining. Thanks for the help.
Reply With Quote
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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
Trackbacks are On
Pingbacks are On
Refbacks are On





All times are GMT -5. The time now is 07:20 PM.



Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
SEO by vBSEO
User Alert System provided by Advanced User Tagging v3.2.3 (Lite) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.