No Overdrive ? - Diesel Bombers

Chevy/GMC 6.2L and 6.5L Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines

No Overdrive ?

  #1  
Old 03-07-2019, 09:41 PM
Diesel Enthusiast
Thread Starter
Join Date: Jun 2011
Posts: 108
Thanked 12 Times in 12 Posts
Default No Overdrive ?

Another issue on the 97, 6.5 is I lost overdrive . At first it would engage after a few miles and they it would drop back to third gear after a few more , sometimes shifting back to OD , but now it won't go into OD at all. It shifts great up and down 1st to 3rd and back to first, no slipping at all but OD will not engage at all, even by moving the shift lever fron 3 to OD it just stays in 3rd..

Is there some controller outside the transmission that gives a signal to shift up into OD other than the geat shift ? Is there a way to add a manual switch to engage OD when needed . I heard rumours of this but can not find any information.
.Opening the transmission at this time is not an option. 2700 RPM on the highway is a fuel consumption disaster.
Thanks Pete
 

Last edited by petew; 03-07-2019 at 09:43 PM.
  #2  
Old 03-11-2019, 01:28 PM
Diesel Enthusiast
Thread Starter
Join Date: Jun 2011
Posts: 108
Thanked 12 Times in 12 Posts
Default

Can someone post a wiring diagram for the transmission controls for this 97 , 6.5 automatic 4x4 ? or a link to one ?
After hours on line I am striking out finding the wiring diagrams that show the tranny wiring, and controls.
 

Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.