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4L70E Transmission Help Tranny Info and Upgrades including torque converters (stall)

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Old Apr-11-17, 02:48 PM   #1

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Default Coming out of overdrive.

Went on a road trip a few weeks ago. After about 500 miles of driving the service engine light came on and then I noticed the rpms was about 300 rpms higher at 70mph. I couldnt get the over drive to kick in.
As I slowed to turn in to a gas station it down shifted hard in low. I checked code with my scanner while getting gas, P0894 transmission comp slipping showed up. I cleared code and hit the highway again and it seemed to run fine. Even the Over Drive worked.
This happened again twice on same trip while driving on freeway, so the tranny temp is hot when this happens. Recently I made another hour or so drive and had the same problem. Cold the transmission seems to shift fine and lockup hard in overdrive. I have checked the fluid and it is clean. Not brown or smelling burnt However the fluid level looks high on the dipstick by quite a bit. Pulls very hard if I goose it and shifts fine. A few times out of the blue it will miss third in a takeoff at maybe 10% throttle and if I let off of everything it pops in. Anyone else had this issue?

Approximately 5k on rebuild trans
2500 stall TC, Z pack wider bands, sun gear. Harden sleeves. High volume oil pump etc.
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Old Apr-11-17, 07:24 PM   #2
 
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Hello
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Old Apr-12-17, 03:50 AM   #3

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sounds like you lost lockup not OD, for only a 300rpm difference.

sounds like a worn TCC solenoid bore in the valve body.

Last edited by 6speedblazer; Apr-12-17 at 03:52 AM.
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Old Apr-12-17, 05:32 AM   #4

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I thought something in valve body.. would you recommend a Flush with new fluid to make sure it's not trash?

Last edited by Ryno2fast4u; Apr-12-17 at 05:33 AM. Reason: Spelling
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Old Apr-12-17, 06:00 AM   #5
 
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I believe the guy who built mine would use new fluid and filter anytime he dropped my pan when mine had been having solenoid problems in the valve body in the past. But i know everyone is different, just sharing my experiences. GL

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Old Apr-12-17, 07:50 AM   #6

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I thought something in valve body.. would you recommend a Flush with new fluid to make sure it's not trash?
Take it back to whoever built it.
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Old Apr-12-17, 02:19 PM   #7

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Take it back to whoever built it.
I wish it was that simple. I'm in NC. It was done in NJ right before I bought it.
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Old Apr-12-17, 02:51 PM   #8

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I just wondered if there was anyone that's experienced the same thing and what infact fixed it without chasing different things. I already called the local shop told them my problem and they are trying to tell me to completely rebuild it which isn't in the cards for me right now. My other question is there a way to see something like tcc solenoid with looking at hp tuners software?
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Old Apr-12-17, 05:46 PM   #9

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You should be able to log line pressure and see the pressure drop when it attempts to lock the convertor. Then goes to max pressure after it fails to lock.

What happens is the bore in the valve body wears and becomes egg shaped. The valve sticks and the pcm sees that as a slip and jacks the line pressure to the rooof.

After that you have harsh shifts from the high line pressure and no lockup because the vavle is stuck in the valve body
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Old Apr-13-17, 06:24 AM   #10
 
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This bushing is a huge player in the issue you describe. Overlooked by most. Allows lookup apply oil to leak past it giving you the slip code.
IMG_0055.JPG
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Old Apr-13-17, 12:51 PM   #11

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Is this something I can drop the pan on a lift and fix below? Also am I going to kill my trans/converter if I wait a few weeks to fix?
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Old Apr-13-17, 05:00 PM   #12
 
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Anything in the valve body, yes. The pic that Tramsman posted is the pump, would have to drop the trans for that. If its a solenoid, it can also be done by dropping the pan.
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Old Apr-13-17, 07:13 PM   #13
 
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Is this something I can drop the pan on a lift and fix below? Also am I going to kill my trans/converter if I wait a few weeks to fix?
What pursuit said, and i wouldn't chance it especially with these trucks. But thats just me cuz i know how expensive things can get.

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Old Apr-14-17, 05:32 AM   #14
 
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This is the only time I see the P0894 code. If you were getting A DTC P1870 indicates that a mechanical malfunction exists. If any other DTC's set along with a DTC P1870, then diagnose those first. A DTC P1860 (TCC PWM Solenoid Circuit Electrical) will set if a TCC PWM solenoid circuit failure exists. A DTC P0740 (TCC Enable Solenoid Circuit Electrical) will set if a TCC enable solenoid circuit failure exists. These code go with VB and solenoid problems. Actually all bushings in transmission should be replaced at overhaul to restore tolerances for sealing and lubrication.
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Old Apr-19-17, 11:37 PM   #15

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Default Coming out of overdrive.

Unfortunately there is no simple answer or cure all here, all of the above mentioned failure points are possible. It's also possible your torque converter is junk and the clutch doesn't lock up properly. Have you smelled the fluid? If it's burnt she's gotta come out, don't waste your time on anything besides pulling it, checking your tcc hydraulic circuit and repairing as necessary.

Very first thing to check on all trans concerns is fluid level and condition. If it's burnt your going to have to pull the unit to repair it.

Also if your making or planning on making any power ditch the z-pack. Borg warner hi-energy clutches and kolene steels is the best option.

Last edited by awdvette; Apr-19-17 at 11:42 PM.
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Old Apr-20-17, 03:56 PM   #16
 
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I am in Winston and have a transmission and 3600 yank converter sitting in the floor......was going to have rebuilt and sell it.....
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Old May-30-17, 02:16 PM   #17

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I am in Winston and have a transmission and 3600 yank converter sitting in the floor......was going to have rebuilt and sell it.....
Can you message me your number?
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Old May-30-17, 02:38 PM   #18
 
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