1999 Dodge cummins O/D shift problem

Busnut · 08-17-2009, 04:45 AM

I have a 99 dodge cummins @45 it wants to shift to O/D any acceleration it downshits back and forth till 65+ is reached even above 65 the tack will jump up about 500 rpm then drop back and continue doing this constantly. Help!!!!! I luv this old truck!!!

Kennyray · 08-17-2009, 05:29 AM

sounds more the the torque convertor locking and unlocking

chevyguy · 08-17-2009, 11:36 AM

How long has it been since you did a fluid filter adn gasket change on this transmission?

bradrhale · 08-17-2009, 01:15 PM

check TSBs on that tranny. 99 model dodges with those trannies are notorious for having problems and involve cracking it open. seen it many of times. literally everyone i know with one, has or had a problem with them.

cowboy922 · 11-15-2009, 07:09 PM

I had the similar problem with my 99 Dodge. Had the tranny rebuilt, worked fine for a while. Started all over again. Finally found out there was an electrical issue. Had a bad connection at the batteries. I put new cable ends on ( clamp on) worked alright for a while. Finally, I took it to an auto electric shop, had new crip on ends put on
(like factory) had been shifting fine ever since. I know it doesn't sound right but I was told you have to have the right voltage for the tranny to shift properly.

08-17-2009, 04:45 AM	#1
Busnut Junior Member Join Date: Aug 2009 Posts: 1	1999 Dodge cummins O/D shift problem I have a 99 dodge cummins @45 it wants to shift to O/D any acceleration it downshits back and forth till 65+ is reached even above 65 the tack will jump up about 500 rpm then drop back and continue doing this constantly. Help!!!!! I luv this old truck!!!

08-17-2009, 05:29 AM	#2
Kennyray Senior Member Join Date: Oct 2005 Location: Birmingham, AL Posts: 648	sounds more the the torque convertor locking and unlocking __________________ On a quiet night you can hear a Ford rust

08-17-2009, 11:36 AM	#3
chevyguy Senior Member Join Date: Sep 2005 Location: ALABAMA Posts: 3,370	How long has it been since you did a fluid filter adn gasket change on this transmission? __________________ Friends dont let friends use body lifts USMC 92-96 USCG 98 to present

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08-17-2009, 01:15 PM	#4
bradrhale Senior Moderator Join Date: Apr 2006 Location: Texas Posts: 8,018	check TSBs on that tranny. 99 model dodges with those trannies are notorious for having problems and involve cracking it open. seen it many of times. literally everyone i know with one, has or had a problem with them.

11-15-2009, 07:09 PM	#5
cowboy922 Junior Member Join Date: Nov 2009 Location: Florida Posts: 2	I had the similar problem with my 99 Dodge. Had the tranny rebuilt, worked fine for a while. Started all over again. Finally found out there was an electrical issue. Had a bad connection at the batteries. I put new cable ends on ( clamp on) worked alright for a while. Finally, I took it to an auto electric shop, had new crip on ends put on (like factory) had been shifting fine ever since. I know it doesn't sound right but I was told you have to have the right voltage for the tranny to shift properly.