tranny trouble or something not sure.!!!

Deisel Devin · 11-04-2009, 02:12 PM

my truck going down the road it shifts in and out like really bad around 50- up like it wants to shift down and does it but then jumps back up then back down then up i have no idea whats going on.

__________________
'94 2500 Dodge Cummins Turbo Diesel 12 valve 4x4.
starwheel cranked, Custom intake with custom 5 inch stacks, silencer ring MIA, more to come.

Busted Knuckles · 11-04-2009, 03:49 PM

Sounds like TPS

__________________
96' 3500 Reg Cab 4x4 Leveled on 35"s HX35/40 Hybrid, Custom intake box w/ AFE BHAF, O-Ringed Head, Ported exhaust, 4" turbo back, 5x12's, #0 Plate, Gutted AFC

illflem · 11-04-2009, 08:34 PM

Try this> TPS testing and adjustment

__________________
Bill
'95 2500 4wd auto
'95 3500 5 speed heavy hauler
Not stock

hulkaman2003 · 11-07-2009, 11:26 PM

Lots of great info about the TPS!!! Just wondering if the TPS is what causes mine to jump out of OD and the OD off light on the dash comes on. I have to press the button and then it'll go back to OD. Only happens once in a while but, at highway speeds when it jumps out, the RPMs get up in the 2,700+ range. If anyone has any info or has the same problem, would you please post your findings? Thanks, Dave.

RPegram · 11-08-2009, 05:59 AM

The TPS should not cause the OD switch light to come on. Sounds like a bad switch or short in that circuit.

__________________
'96 Dodge 3500,KDP killed, boost-pyro-trans temp, not stock anymore
'01 Dodge 2500 4X4, EC, LB, 6 speed, FP-pyro-boost,
'97 Chevrolet Suburban, K1500, 4.10 gears

***JohnBer*** · 11-08-2009, 07:25 AM

Quote:

Originally Posted by hulkaman2003

Lots of great info about the TPS!!! Just wondering if the TPS is what causes mine to jump out of OD and the OD off light on the dash comes on. I have to press the button and then it'll go back to OD. Only happens once in a while but, at highway speeds when it jumps out, the RPMs get up in the 2,700+ range. If anyone has any info or has the same problem, would you please post your findings? Thanks, Dave.

mine did that to me a few times. there was no rhyme or reason to it. installed a new switch and it has not done it sinse. oh, it's been a year now sinse i replaced the switch. think it had somthing to do with coffee from the cup spiller right next to it.

__________________
Dog's truck:95 2wd ex, built auto, kdp tabbed, 3 disc billet converter,3.54 gears, 4gsk, bhaf, 0 plate, rack plug, 90hp injectors, 191 DV's, htt 62/71/14, timed @17*, 60# valve springs, head studs, 5" exhaust, gauges

hulkaman2003 · 11-18-2009, 02:21 AM

JohnBer,

Thanks for the info, I changed the switch and so far, so good. I appreciate the response, I imagine that the 44 oz Mountain Dew may have had something to do with it. Dave.

sayiwont20 · 11-18-2009, 02:03 PM

hey man, i have the same problem with my 94 12 valve, and i still cant figure it out, i was told to check any grounds that link to tranny, batteries, or alternator, and the altornator also comes loose from belt pressure, if you find any info could you also help me out? thanx

hulkaman2003 · 11-18-2009, 11:16 PM

sayiwont20,

JohnBer suggested changing the switch, which I did, and haven't had it jump out of overdrive since. I wouldn't doubt that pop or coffee ended up in it at some point years ago. I can't understand how your alternator is coming loose under belt tension. The serpentine system uses an idler pulley and tensioner to maintain belt pressure and the alternator should be rigidly mounted to the alternator bracket. Am I missing something? I've also seen where the TPS can cause erratic operation and shifting. Have you performed the TPS tests listed previously on this post? I'll try to be as helpful as I can. Dave.

11-04-2009, 02:12 PM	#1 (permalink)
Deisel Devin Cummins Fan Join Date: Mar 2009 Posts: 42 Thanks: 1 Thanked 1 Time in 1 Post Deisel Devin's Truck Pics	tranny trouble or something not sure.!!! my truck going down the road it shifts in and out like really bad around 50- up like it wants to shift down and does it but then jumps back up then back down then up i have no idea whats going on. __________________ '94 2500 Dodge Cummins Turbo Diesel 12 valve 4x4. starwheel cranked, Custom intake with custom 5 inch stacks, silencer ring MIA, more to come.

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11-04-2009, 03:49 PM	#2 (permalink)
Busted Knuckles Cummins Enthusiast Join Date: Sep 2009 Location: Tyler, TX Posts: 202 Thanks: 3 Thanked 8 Times in 8 Posts Busted Knuckles's Truck Pics	Sounds like TPS __________________ 96' 3500 Reg Cab 4x4 Leveled on 35"s HX35/40 Hybrid, Custom intake box w/ AFE BHAF, O-Ringed Head, Ported exhaust, 4" turbo back, 5x12's, #0 Plate, Gutted AFC

11-04-2009, 08:34 PM	#3 (permalink)
illflem Super Moderator Join Date: Nov 2005 Location: Montana Posts: 6,547 Thanks: 5 Thanked 298 Times in 263 Posts illflem's Truck Pics	Try this> TPS testing and adjustment __________________ Bill '95 2500 4wd auto '95 3500 5 speed heavy hauler Not stock

11-07-2009, 11:26 PM	#4 (permalink)
hulkaman2003 Cummins Fan Join Date: Nov 2009 Location: Michigan Posts: 47 Thanks: 0 Thanked 1 Time in 1 Post hulkaman2003's Truck Pics	Lots of great info about the TPS!!! Just wondering if the TPS is what causes mine to jump out of OD and the OD off light on the dash comes on. I have to press the button and then it'll go back to OD. Only happens once in a while but, at highway speeds when it jumps out, the RPMs get up in the 2,700+ range. If anyone has any info or has the same problem, would you please post your findings? Thanks, Dave.

11-08-2009, 05:59 AM	#5 (permalink)
RPegram Diesel Head Join Date: Sep 2009 Location: Arapahoe, NC Posts: 1,086 Thanks: 3 Thanked 115 Times in 110 Posts RPegram's Truck Pics	The TPS should not cause the OD switch light to come on. Sounds like a bad switch or short in that circuit. __________________ '96 Dodge 3500,KDP killed, boost-pyro-trans temp, not stock anymore '01 Dodge 2500 4X4, EC, LB, 6 speed, FP-pyro-boost, '97 Chevrolet Suburban, K1500, 4.10 gears

11-18-2009, 02:21 AM	#7 (permalink)
hulkaman2003 Cummins Fan Join Date: Nov 2009 Location: Michigan Posts: 47 Thanks: 0 Thanked 1 Time in 1 Post hulkaman2003's Truck Pics	JohnBer, Thanks for the info, I changed the switch and so far, so good. I appreciate the response, I imagine that the 44 oz Mountain Dew may have had something to do with it. Dave.

11-18-2009, 02:03 PM	#8 (permalink)
sayiwont20 Newbie Join Date: Nov 2009 Posts: 16 Thanks: 0 Thanked 0 Times in 0 Posts sayiwont20's Truck Pics	hey man, i have the same problem with my 94 12 valve, and i still cant figure it out, i was told to check any grounds that link to tranny, batteries, or alternator, and the altornator also comes loose from belt pressure, if you find any info could you also help me out? thanx

11-18-2009, 11:16 PM	#9 (permalink)
hulkaman2003 Cummins Fan Join Date: Nov 2009 Location: Michigan Posts: 47 Thanks: 0 Thanked 1 Time in 1 Post hulkaman2003's Truck Pics	sayiwont20, JohnBer suggested changing the switch, which I did, and haven't had it jump out of overdrive since. I wouldn't doubt that pop or coffee ended up in it at some point years ago. I can't understand how your alternator is coming loose under belt tension. The serpentine system uses an idler pulley and tensioner to maintain belt pressure and the alternator should be rigidly mounted to the alternator bracket. Am I missing something? I've also seen where the TPS can cause erratic operation and shifting. Have you performed the TPS tests listed previously on this post? I'll try to be as helpful as I can. Dave.