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Discussion Starter #1
Hey all, So ive got a billet triple disk converter and a billet stage 3 transmission express heavy haulers trans with high pressure valve body upgrade in my 03 2500. I live in northern Canada and we had a nasty cold snap a few weeks ago and it caused my pan to start to leak on start up a tiny bit. So i bought a new pan seal, filter and some fluid, dropped the pan put new seal and filter in cleaned the pan and filled her back up. I overfilled it a tiny bit and realized after i was cleaning the shop that i forgot to put the magnet back in the pan... oops. Decided id leave it for the night and drop the pan again the next day. However on my way home from the shop it started slipping in overdrive going up the hill. Assumed it was just from over filling it, so i pulled the pan again and changed the fluid and put the magnet back in. noticed that the fluid looked a little dirty and there was a bit flakeyness in the bottom of the pan which seems not so good for only being in the trans for a day. Anyways cleaned it all up and filled it back up with the acceptable amount of fluid but it still slips overdrive! Havnt had a single problem up until i did the service, find it hard to believe that running it without a magnet for 24 hours would have caused any real damage so im a little worried and a little confused. any thoughts are much appreciated... hopefully i dont have to pull this trans again lol. Was doing some reading through old threads and saw bit of talk of the tps acting up and causing similar problems but that seems like a pretty weird coincidence but im not really sure.
 

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Nope, just a coincidence. OD is all mechanical, if it is in OD and slips the clutches are done. Is it actually OD slipping? Can you make it happen in drive with enough throttle and load?

Over filling will not cause an issue either.
 

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Discussion Starter #3
All the service manuals i have read say "overfilling can cause slippage" doesnt do it any other gear at any time, only over drive while under a bit of load maybe 30% ( doing 80km + going up hill) and i mean tripple disk converter and billet everything trans with extra clutch packs what would make that go? like not like its a race truck... might drive her a little heavy footed here and there but ive never had my smarty oveer the lowest tune with timing and i treat her pretty good. also never overheated trans (have a gauge on the smarty) and output shaft speed seems normal.( around 2000-2200 RPM in overdrive)
 

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Discussion Starter #4
Also, i had the trans out and looked through about 15,000k ago and shipped the converter out and got it rebuilt because my pump failed and damaged the collar on the converter... so essentially a new converter and 100% clean trans 15,000k ago
 

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The debris in the pan for only one drive ( where it seemed to slip in OD ) tells the story .
 

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At this point I would double check pressure is good.
Test for OD pressure by
Transmission In Overdrive Fourth Gear
This test checks line pressure at the overdrive
clutch in fourth gear range. Use 300 psi Test Gauge
C-3293-SP for this test. The test should be performed
on the road or on a chassis dyno.
(1) Remove tachometer; it is not needed for this test.
(2) Move 300 psi Gauge to overdrive clutch pressure
test port. Then remove other gauge and reinstall test port plug.
(3) Lower vehicle.
(4) Turn OD switch on.
(5) Secure test gauge so it can be viewed from
drivers seat.
(6) Start engine and shift into D range.
(7) Increase vehicle speed gradually until 3-4 shift
occurs and note gauge pressure.
(8) Pressure should be 524-565 kPa (76-82 psi) with closed throttle and increase to 690-896 kPa
(100-130 psi) at 1/2 to 3/4 throttle. Note that pressure can increase to around 965 kPa (140 psi) at full
throttle.

Pressure low in D Fourth Gear Range
Overdrive clutch piston seal, or check ball problem
 

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All the service manuals i have read say "overfilling can cause slippage"
MAY cuase slippage, operative word here is MAY. You run almost 2 quarts over the full mark on the stick in a 48RE with no issues. If you over fill to the point where it MAY be a problem you will have fluid running out of the vent behind the TC. That is just a CYA statement and is never qualified what "over full" constitutes or what really happens.

Check the OD apply pressure and see if it is in spec, if it isn't then the seals are gone.
 

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Discussion Starter #9
But wasn't the OD unit rebuilt 15k ago also? It's also weird that it happened after a fluid change.
The TQ was rebuilt, The trans just got a once over from my transmission guy and new pump put in
 

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Discussion Starter #10
At this point I would double check pressure is good.
Test for OD pressure by
Transmission In Overdrive Fourth Gear
This test checks line pressure at the overdrive
clutch in fourth gear range. Use 300 psi Test Gauge
C-3293-SP for this test. The test should be performed
on the road or on a chassis dyno.
(1) Remove tachometer; it is not needed for this test.
(2) Move 300 psi Gauge to overdrive clutch pressure
test port. Then remove other gauge and reinstall test port plug.
(3) Lower vehicle.
(4) Turn OD switch on.
(5) Secure test gauge so it can be viewed from
drivers seat.
(6) Start engine and shift into D range.
(7) Increase vehicle speed gradually until 3-4 shift
occurs and note gauge pressure.
(8) Pressure should be 524-565 kPa (76-82 psi) with closed throttle and increase to 690-896 kPa
(100-130 psi) at 1/2 to 3/4 throttle. Note that pressure can increase to around 965 kPa (140 psi) at full
throttle.

Pressure low in D Fourth Gear Range
Overdrive clutch piston seal, or check ball problem
Thanks ill see if i can give this a go haha,
 

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Tells what story tho

It is evidence that cannot be denied from a short drive , the OD section is toasted and needs repaired.
IE: the debris is from what it slipping . I know "it shouldnt be " but it is.
No need to agonise or look further . The trans has to come out yet again and the builder has to take particular care with the rebuild. cleaning and measuring , ect ect

What converter is in use ?
Do you plan on using the same trans builder ?

Goerend would be my only choice for a triple disk TQ .



sorry for the tuff questions and your trans troubles
 

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Discussion Starter #13
It is evidence that cannot be denied from a short drive , the OD section is toasted and needs repaired.
IE: the debris is from what it slipping . I know "it shouldnt be " but it is.
No need to agonise or look further . The trans has to come out yet again and the builder has to take particular care with the rebuild. cleaning and measuring , ect ect

What converter is in use ?
Do you plan on using the same trans builder ?

Goerend would be my only choice for a triple disk TQ .



sorry for the tuff questions and your trans troubles
its a "transmission express" billet triplle disk, bought it with my trans they are a shop out of Edmonton. however it was rebuilt by a shop with suncoast internals i think. Been dumping snow where i am lately so havnt really been able to get the thing fast enough to even hit over drive, lol but i took her on the highway yesterday to see whats happening and it didnt slip it all... ran great if anything. running 45% load and turning like 2500 rpm output shaft speed and it locked up and drove fine. not sure if the slipping could have been some air in the lines from the service ? i dont know. i have it booked in to get the overdrive pressure tested anyways and make sure everything is all good.
 

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my vote is for the TC...……………......…...
 

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Discussion Starter #15
my vote is for the TC...……………......…...
Vote for tc as in tc is gone? converter is essentially brand new... and ive had the converter go and it was nothing like this, slipped all gears and pissed fluid out of the inspection plate when i was having tc issues.
 

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Discussion Starter #16
update,

trans seemed to be all good on a highway drive the other day there, didnt slip at all under any load or at any speed, next day overdrive slipped again going up the hill on my way from home from work. Currently seems to be hit or miss whether it will slip or not so ive got it booked in next week with my trans guy in town. Hopefully get him to check over drive pressure, check band adjustment, and do another full service. not sure what es i can get a guy to check that would relate to the overdrive slippage without pulling the trans so if any one has any suggestions they are greatly appreciated.

on a side note ive got a spare trans laying around that needs a rebuild and ive been toying with the idea of pulling it apart and putting it back together a few times and eventually rebuilding with some strong af internals... i am far from a trans specialist and my knowledge on the subject isnt the best. so if anyone has any references to old threads with some helpful tear down/ rebuild tips and or manuals or anything again, greatly appreciated haha
will update when i get her into the shop.
 

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Some people vote like liberals, cuz it sounded good.

Are you sure it is OD slipping and not the TC clutch slipping? Tough to tell the difference in those. Even checking pressure doesn't tell you if the clutch pack is actually gone unless the seal is bad. Intermittent slipping if you can verify the pressures change would point to a problem in the lower part of the VB.
 

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Some people vote like liberals, cuz it sounded good.

Are you sure it is OD slipping and not the TC clutch slipping? Tough to tell the difference in those. Even checking pressure doesn't tell you if the clutch pack is actually gone unless the seal is bad. Intermittent slipping if you can verify the pressures change would point to a problem in the lower part of the VB.
I'm with you on this. If it were a apply piston seals or the frictions it wouldn't be intermittent, and I'd be thinking valve body issue of some sort.
 

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Discussion Starter #19
Some people vote like liberals, cuz it sounded good.

Are you sure it is OD slipping and not the TC clutch slipping? Tough to tell the difference in those. Even checking pressure doesn't tell you if the clutch pack is actually gone unless the seal is bad. Intermittent slipping if you can verify the pressures change would point to a problem in the lower part of the VB.
if the tc is whats slipping wouldn't it slip in other gears as well? and how can i tell the difference ?
 

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Leverage in OD. Other gears you may not notice it slipping because the leverage is not as great. What signs are you seeing that something is slipping or not right? Detail that a little better if would please.
 
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