'98 12 valve no overdrive or lockup - Dodge Diesel

shrmpboatcptn · 06-09-2012, 01:24 PM

my friend just bought a truck im trying to help him out on. every gear shifts fine except that it doesnt seem to go into lockup or overdrive. he already replaced the two sensors on the passenger front corner of the valve body. Is there any common things that could cause this besides maybe the od/ lockup solenoid?
the truck specifics are that its a 98 3500 4x4 12 valve engine. any thoughts or ideas of what to try are appreciated. also im pretty sure the transmission has been replaced at one point or another and it has roughly 250,000 miles on the truck

95ram · 06-09-2012, 07:08 PM

You need to hook up a pressure gauge and make sure it's going into OD. Had one that would do this and it was time for a rebuild.

D-Roc · 06-13-2012, 04:16 PM

TPS can be a culprit as well...

infidel · 06-13-2012, 07:17 PM

http://dodgeram.org/tech/transmissio...TPS_adjust.htm

kujo · 06-19-2012, 11:31 AM

get rid of the TPS all together, do the potentiometer mod.. way better setup and alot cheaper. do a search and you should find it..

06-09-2012, 07:08 PM	#2
95ram Registered User Join Date: May 2004 Location: Fergus Falls, MN Posts: 1,354 My Photo Gallery My Classified Ads	You need to hook up a pressure gauge and make sure it's going into OD. Had one that would do this and it was time for a rebuild. __________________ 98 12V,QC,4x4,SB,AT Powered by Banks

06-13-2012, 04:16 PM	#3
D-Roc Registered User Join Date: Oct 2006 Location: Cold Lake, Alberta Posts: 676 My Photo Gallery My Classified Ads	TPS can be a culprit as well... __________________ 1998 5 sp a few mods 1994 Auto

06-13-2012, 07:17 PM	#4
infidel Registered User Join Date: Dec 2003 Location: Montana Posts: 14,434 My Photo Gallery My Classified Ads	http://dodgeram.org/tech/transmissio...TPS_adjust.htm __________________ Bill '95 2500 4x4 auto '95 3500 5 speed flatbed hauler stock for one day

06-19-2012, 11:31 AM	#5
kujo Registered User Join Date: Jul 2010 Location: nova scotia, canada Posts: 97 My Photo Gallery My Classified Ads	get rid of the TPS all together, do the potentiometer mod.. way better setup and alot cheaper. do a search and you should find it.. __________________ Black 97 2500 4x4 CTD, long box ex cab, diamond eye 4", BHAF, fuel plate MIA, New Era 5x12s, transgo TFOD, 3k GSK, gauges, protorque billet single disk, lock up switch, POT mod, KDP tabbed, ARP studs, 60# springs 94 1 ton C&C cummins parts truck 2wd 5 spd 94 2500 cummins auto 4x4 parts truck

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