68rfe problems.. gear 2 incorrect ratio - Page 2 - Dodge Cummins Diesel Forum
4th Gen Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine, Transmission, etc...NO ADVERTISING

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post #13 of 27 (permalink) Old 04-02-2019, 10:48 PM Thread Starter
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well today i installed a 2nd brand new valve body with grey connector solenoid pack.
Performed quick learn

CVI Values are
OD-49
UD-53
LR-64
4C- 48-51
2C-42

it now finally goes into 4th gear, but the truck revs right up, and truck doesn't seem to accelerate very fast. im assuming because torque converter isn't locking up in 4th.
Also there was some codes thrown in 4th.
P0876
P0734
P0933
P0935
P02706

Line pressure is showing 160.9 Psi

Once i drive for a couple minutes, and transmission warms up, the torque converter stays engaged in reverse, and 1st gear drive. If i start truck, and shift into reverse or drive it wants to stall.

any ideas anyone? @TransEngineer


2010 dodge 2500 6.7-iron cross bumpers front and rear,H&S Mini max, dpf deleted, 35inch nitto mudd graplers, 2.5inch leveling kit.
2016 dodge ram 3500 longhorn 6.7- 33" Tires
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post #14 of 27 (permalink) Old 04-03-2019, 06:15 AM
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Quote:
Originally Posted by cummins_fanatic View Post
well today i installed a 2nd brand new valve body with grey connector solenoid pack.
Performed quick learn

CVI Values are
OD-49
UD-53
LR-64
4C- 48-51
2C-42

it now finally goes into 4th gear, but the truck revs right up, and truck doesn't seem to accelerate very fast. im assuming because torque converter isn't locking up in 4th.
Also there was some codes thrown in 4th.
P0876
P0734
P0933
P0935
P02706

Line pressure is showing 160.9 Psi

Once i drive for a couple minutes, and transmission warms up, the torque converter stays engaged in reverse, and 1st gear drive. If i start truck, and shift into reverse or drive it wants to stall.

any ideas anyone? @TransEngineer
Wow, sounds like you have multiple problems. MS solenoid circuit, line pressure sensor, OD clutch slippage, TCC drag, pump whine, etc.

Offhand, I'd say pull it back out, air check the OD clutch to see if you have a bad seal there somewhere, make sure the OD clutch pack is OK, double-check the clutch clearances, and probably replace the pump and converter.

By the way, either solenoid module (white or gray) should work in your truck.
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post #15 of 27 (permalink) Old 04-03-2019, 10:23 AM Thread Starter
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is there anyway to test the pump? air tested all of the clutches again, they all sound good. i guess i will pull it back out.

2010 dodge 2500 6.7-iron cross bumpers front and rear,H&S Mini max, dpf deleted, 35inch nitto mudd graplers, 2.5inch leveling kit.
2016 dodge ram 3500 longhorn 6.7- 33" Tires
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post #16 of 27 (permalink) Old 04-03-2019, 10:31 AM
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is there anyway to test the pump? air tested all of the clutches again, they all sound good. i guess i will pull it back out.
No, there is no simple way to test the pump. Normally, you could monitor the line pressure and see how well it can maintain the desired LP level. But because you're also having issues with the TCC function, I suspect you may have a sticky or worn TCC control valve (in the pump), and the only way to check that is to pull it out and inspect it.

If the TCC is dragging in 1st and/or reverse, and the pump is OK, then the converter is bad internally.
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post #17 of 27 (permalink) Old 04-03-2019, 12:06 PM Thread Starter
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does it seem weird that the TCC only drags once everything is running for a while and warmed up? once i pull the pump out, how would i go about testing the TCC Control valve? just visually, and that it has clean free movement?

2010 dodge 2500 6.7-iron cross bumpers front and rear,H&S Mini max, dpf deleted, 35inch nitto mudd graplers, 2.5inch leveling kit.
2016 dodge ram 3500 longhorn 6.7- 33" Tires
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post #18 of 27 (permalink) Old 04-03-2019, 12:40 PM
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does it seem weird that the TCC only drags once everything is running for a while and warmed up? once i pull the pump out, how would i go about testing the TCC Control valve? just visually, and that it has clean free movement?
Yes, check the valves that they slide freely in their bores. Also check for bore wear: there should be almost NO gap between the valves and their bores (it should be like .001"). Shine a flashlight over each bore and see if you can see light around the valve anywhere.

TCC drag can be caused by loss of line pressure, so if that happens only when hot, could be the pump itself is worn and not able to keep LP up at idle. Best way to diagnose that is to simply read the line pressure at idle (using a scan tool) and see if it's stable. It should be 40 psi or higher.
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post #19 of 27 (permalink) Old 04-03-2019, 12:42 PM Thread Starter
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changed my pressure sensor, and did some more test driving this morning. torque converter didnt stay locked up once, and now im only getting codes P0734 Gear 4 incorrect ratio. and P0933 Hydraulic pressure sensor. when i pull it out i will concentrate on 4c clutch, and pump.

2010 dodge 2500 6.7-iron cross bumpers front and rear,H&S Mini max, dpf deleted, 35inch nitto mudd graplers, 2.5inch leveling kit.
2016 dodge ram 3500 longhorn 6.7- 33" Tires
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post #20 of 27 (permalink) Old 04-03-2019, 12:51 PM Thread Starter
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Line pressure at idle in park is 100-130psi
in drive with brake on 71-85
in reverse with brake on 200-220

2010 dodge 2500 6.7-iron cross bumpers front and rear,H&S Mini max, dpf deleted, 35inch nitto mudd graplers, 2.5inch leveling kit.
2016 dodge ram 3500 longhorn 6.7- 33" Tires
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post #21 of 27 (permalink) Old 04-03-2019, 12:51 PM
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changed my pressure sensor, and did some more test driving this morning. torque converter didnt stay locked up once, and now im only getting codes P0734 Gear 4 incorrect ratio. and P0933 Hydraulic pressure sensor. when i pull it out i will concentrate on 4c clutch, and pump.
Fix the P0933 before you pull it out. That code can indicate a bad LP sensor (which obviously shouldn't be the case now), OR a bad connection (LP sensor connector not fully seated and latched), OR bad wiring (in one of the LP sensor circuits). Since a wacky LP reading can cause bad line pressure (which can lead to slippage, and therefore ratio errors), I would get the LP sensor issue fixed and see if that corrects the ratio error.

And the 4C clutch is used in 3rd and 5th gears, so the problem in a P0734 is usually the OD clutch.
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post #22 of 27 (permalink) Old 04-03-2019, 01:36 PM Thread Starter
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the P0933 only shows up at the same time i get the P0734. ive got 3 different sensors that ive changed, one of them was brand new. if i put a meter on the line pressure plug, where do the wires run back to, that i could test.

2010 dodge 2500 6.7-iron cross bumpers front and rear,H&S Mini max, dpf deleted, 35inch nitto mudd graplers, 2.5inch leveling kit.
2016 dodge ram 3500 longhorn 6.7- 33" Tires
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post #23 of 27 (permalink) Old 04-03-2019, 01:43 PM
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the P0933 only shows up at the same time i get the P0734. ive got 3 different sensors that ive changed, one of them was brand new. if i put a meter on the line pressure plug, where do the wires run back to, that i could test.
The wires run to the PCM. You'd have to search online for a wiring diagram to get the pinouts on the connectors. You can try rambodybuilder.com.
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post #24 of 27 (permalink) Old 04-03-2019, 05:41 PM Thread Starter
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i found the pin out in my Chrysler shop manual. i will proceed to check the pin-outs. i also air checked od-ud-reverse again, they all operate correctly.

2010 dodge 2500 6.7-iron cross bumpers front and rear,H&S Mini max, dpf deleted, 35inch nitto mudd graplers, 2.5inch leveling kit.
2016 dodge ram 3500 longhorn 6.7- 33" Tires
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