Overdrive Transmission Grimlins - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 17 (permalink) Old 11-01-2009, 01:35 AM Thread Starter
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Exclamation Overdrive Transmission Grimlins

I have a 2001 model, for some reason about 1200 RPMS between 40-55 the transmission shifts back and forth into overdrive, this is the only gear it does this in, and only at those speeds and at low RPMS, can anyone shed any light on this for me?

:bow: Strokers are not worthy
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post #2 of 17 (permalink) Old 11-01-2009, 01:57 AM
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Check your fluid level for one. Another question are you towing anything

My truck:
1999 Dodge 24 Valve Cummins
P pump conversion with a 180 pump
Pump doesn't have a fuel plate, 4g springs, & full cut dv's, no afc, ect..
.093 fuel lines
Air Dog 165
custom ground cam
mahle pistons with .050 valve reliefs
balanced rotating assembly
8 x 11 injectors
ported head with 60lbs valve springs and 12mm studs
Pro 52
Polydyn header
stage 5 east coast diesel bullit automatic trans.
triple disk dunrite torque converter
4.10 gears
klienn train horns
Nubers with the twins and without header
603hp 1157tq
12.7 quarter mile (then ht3b blew again)
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post #3 of 17 (permalink) Old 11-01-2009, 02:18 AM Thread Starter
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No just simple driving fluid level is fine

:bow: Strokers are not worthy
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post #4 of 17 (permalink) Old 11-01-2009, 03:40 PM
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Quote:
Originally Posted by Bonpas View Post
I have a 2001 model, for some reason about 1200 RPMS between 40-55 the transmission shifts back and forth into overdrive, this is the only gear it does this in, and only at those speeds and at low RPMS, can anyone shed any light on this for me?
It's probably not OD. It's most likely your torque converter clutch (TCC). They are weak from the factory and infact designed to slip .

I would try a lock up switch and see if it ends this, because it doesn't sound like TCC shutter, it just sounds like the PCM isn't sure what to command.

"some people do, some people talk."
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post #5 of 17 (permalink) Old 11-01-2009, 04:09 PM
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My truck:
1999 Dodge 24 Valve Cummins
P pump conversion with a 180 pump
Pump doesn't have a fuel plate, 4g springs, & full cut dv's, no afc, ect..
.093 fuel lines
Air Dog 165
custom ground cam
mahle pistons with .050 valve reliefs
balanced rotating assembly
8 x 11 injectors
ported head with 60lbs valve springs and 12mm studs
Pro 52
Polydyn header
stage 5 east coast diesel bullit automatic trans.
triple disk dunrite torque converter
4.10 gears
klienn train horns
Nubers with the twins and without header
603hp 1157tq
12.7 quarter mile (then ht3b blew again)
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post #6 of 17 (permalink) Old 11-05-2009, 12:54 AM
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If your at 1200 RPM's its going to downshift if you give it a little throttle. If you were say 1500 or 1600, it would have a less likelyhood of downshifting even with a little bit of throttle. Adjusting the TV cable might help a little, but at 1200 rpm's its only natural for the truck to want to do that at that low of RPM's.
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post #7 of 17 (permalink) Old 11-05-2009, 12:57 AM
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oh yeah and another tip, try driving the truck around town with the overdrive off. If the truck is stock and the tranny is aswell, iti will be better for the tranny if the overdrive is off.
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post #8 of 17 (permalink) Old 11-05-2009, 08:38 PM Thread Starter
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Ok so it is getting worse, no the ruck does it anywhere from 45-60 mph I think I'm going to run up to schieds or bowler's and have it checked out

:bow: Strokers are not worthy
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post #9 of 17 (permalink) Old 11-25-2009, 04:53 PM
 
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You ever get that transmission fixed?? You might check your TPS senser I hear it controls overdrive.
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post #10 of 17 (permalink) Old 11-26-2009, 05:37 PM
 
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shifting issues

Hello and Happy Thnx Giving to everyone

I have a 99 cummins 24 valve that I have had in the shop several times due to surging issues. I thought it was either the fuel inj pump/lift pump, the tps (throttle position sensor), or the transmission just not being able to decide on whether or not to shift. It started out with a fluctuation in rpms around 45 plus mph's. The dealer ship said I needed a fuel inj pump/lift pump kit; Cost me 5000 dollars and problem still there. Took it back they changed tps for free after threatening to sue. Problem still there.
Truck seems to be slipping or hesitating to shift while excelerating normally around 2nd or 3rd gear. It also seems to go back and forth up and down in rpms (gear) from 45 plus mph. Taking it out of overdrive really doesn't seem to change it.

I think it is a sensor tied in with the transmission, a torque converter, or the transmission itself.

Can anyone help me?

I am not familiar with Dodge at all.

Thnx
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