Allison 5sp: Torque converter leaking or BS?

hcbrf3

New member
May 30, 2014
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I started making up this long thread with a ton of detail, but I will make this pretty short. Please just ask if you need anymore details.

1. 2003 2500HD with 74k miles. 2 wheel drive, not 4.

2. Very small transmission leak coming out of the inspection hole next to the filter.

3. Never leaking enough to even notice it on my driveway.

4. Chevy dealer and two other professionals looked and said it appeared to be the transmission front seal of the Allison 1000.

5. Took to small shop down the street. Started taking it apart, but then said he wasn't able to get the seal from Chevy. Had to order from Allison.

6. Asked if now that he had more time to look, was sure it was just the seal. Was told used little camera to look up in there, and could see the seal was leaking.

7. Got call asking me to come down to the shop. Was shown TC, and told it was leaking from welds in picture.

8. Told rebuilt TC would be $1200, or new one from Allison was $1800. Told him I needed some time to think about it.

9. Called friend that is a service manager, started pricing on E-bay, called Allison for pricing.

10. E-bay around $500 rebulit. Allison distributor called back saying had local for $910 out the door. This was for a new part.

11. Friend said leaking from the weld didn't add up, one of his techs said the same.

12. Found local shop the does nothing but converters. Had little interest in selling me one, but much interest it seeing mine for testing.

13. Converter hooked up to 120 PSI and dunked in water tank. Looked over for about 10 minutes, never a bubble. Said in 19 years, never seen that happen with Allison 1000 TC.

14. Converter shop laughed when I told him $1200, said he would give me wholesale price for another, but if his truck he wouldn't replace.

15. Told shop owner to replace seal as originally discussed. If still leaking from converter, I understand that is my problem, not his.

16. Had also brought him TSB 03-07-30-057, and that I wanted the copper washer put in there while it was all apart. This was ignored, and not done.

17. Got call just before 6PM saying to come get it. Secretary saying credit card machine is broken, so bring cash or check. Then heard mechanic in the backgroud saying only cash.

18. Was supposed to be $400 to pull tranny and replace seal. Turned into $400 labor, $37 for the seal, and 6 qts transmission fluid at $17 a qt.

19. Bill also states NO PARTS & LABOR WARRANTY. Doesn't want to give warrantly on seal that was replaced.

20. Told to get machine fixed, I will pick up truck when I can pay with my credit card.

Please take a look at pictures, and let me know your thoughts. He is telling me that early Allison TC's had this problem. I have read about them sometimes leaking from the tabs, but not the center weld. Also told if it was leaking from TC, it would be very noticable. Like spraying tranny fluid, not a small leak like I am seeing.

Alright, I lied. Still long post. Very frustrated.
 

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Last edited:

rickaveryjr

Member
Nov 29, 2012
48
0
6
CT
I can't help you out on the TC issue, but WTF kind of fluid are they putting in at $68/gallon?! That's 50% more than Transynd per gallon.
 

redws6rocket

Member
Apr 22, 2007
406
0
16
Odessa, MO
Does the truck set for periods of time? Mine does that, there is a gm bulletin about putting copper washers on the bottom two bolts. If the truck sets and converter drains back it will weep out those bolts. My truck sets a lot and does that just haven't had a chance to pull it and build it! The ones I have seen the fronts seals leak on, they leak fluid out fast and leave huge spots!
 

hcbrf3

New member
May 30, 2014
6
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0
Does the truck set for periods of time? Mine does that, there is a gm bulletin about putting copper washers on the bottom two bolts. If the truck sets and converter drains back it will weep out those bolts. My truck sets a lot and does that just haven't had a chance to pull it and build it! The ones I have seen the fronts seals leak on, they leak fluid out fast and leave huge spots!

Yea, 16 in my small novel.

16. Had also brought him TSB 03-07-30-057, and that I wanted the copper washer put in there while it was all apart. This was ignored, and not done.

My truck does just sit a lot. I work from home, and have a motorcycle and girl friends car. Its pretty much only used for when I go riding. Throw couple bikes in the back, or maybe two large Can Am four wheelers. Nothing that even remotely comes closes to what the truck is capable of doing.
 

hcbrf3

New member
May 30, 2014
6
0
0
I can't help you out on the TC issue, but WTF kind of fluid are they putting in at $68/gallon?! That's 50% more than Transynd per gallon.

Yea, I brought that up as well, but kind of the least of my concerns. I did drain 4 quarts out of the converter to have it tested. He said it was synthetic. Was like pretty sure Allison says just DexIII. Not sure if mixing synthetic with the DEXIII that was in there is a problem. Do know it didn't make much since to me to put the most expensive fluid back in it, if he had no doubt it was still going to be leaking.
 

hondarider552

Getting faster
May 28, 2008
10,627
2
36
34
Arizona
I had a torque converter leaking from where both halfs were welded but it was a lot larger leak, 120psi is not enough air pressure to find a leak from what I remember.
 

hcbrf3

New member
May 30, 2014
6
0
0
I had a torque converter leaking from where both halfs were welded but it was a lot larger leak, 120psi is not enough air pressure to find a leak from what I remember.

I don't truly know, but have talked to two places that do nothing but rebuild TC, and both said if there was a leak it should find it. Said they have seen them leak around where it bolts to the flex plate, but not the weld around the pilot. Seem to agree it should be a pretty noticeable leak if in the converter, since it is under pressure.
 

hcbrf3

New member
May 30, 2014
6
0
0
I had a torque converter leaking from where both halfs were welded but it was a lot larger leak, 120psi is not enough air pressure to find a leak from what I remember.

BTW, your truck sounds insane. Hard to imagine a 2500HD kicking my 1000RR's ass. :)
 

LWATSON

future trans limpers
Jul 30, 2008
2,587
1
36
55
Scotland Neck NC
Why cant the converter just be rewelded? I would think you could drain the fluid clean up the hub and tig weld over the weld all the way around. If you want to find exactly where its leaking clean the weld with a clean rag as good as you can, sprinkle a very thin layer of baby powder over the area and wait a few minutes. Trans fluid will leach up through the powder where the crack is and be very visible.
 

hcbrf3

New member
May 30, 2014
6
0
0
Why cant the converter just be rewelded? I would think you could drain the fluid clean up the hub and tig weld over the weld all the way around. If you want to find exactly where its leaking clean the weld with a clean rag as good as you can, sprinkle a very thin layer of baby powder over the area and wait a few minutes. Trans fluid will leach up through the powder where the crack is and be very visible.

That is exactly what I first said about the weld. He said you couldn't do that, I'm sure because it wouldn't put more cash in his pocket. When I spoke with the company down here that wanted to test it before selling me another, he said the exact same thing. We'll pressure test it and if there is a small leak, which I seriously doubt, we'll weld it up for ya.

Great idea with the baby powder.
 

henery97

Member
Apr 4, 2011
206
0
16
Nebraska
The front seal went out in my LB7 and it was a small leak one day and the next time i drove it i lost about a quart. Also why don't you find someone with a discount and buy a new LML converter straight from GM? IDK for sure, but I have a friend who was quoted around $450. That was 2 years ago though, so things could have changed.
 

redws6rocket

Member
Apr 22, 2007
406
0
16
Odessa, MO
The front seal went out in my LB7 and it was a small leak one day and the next time i drove it i lost about a quart. Also why don't you find someone with a discount and buy a new LML converter straight from GM? IDK for sure, but I have a friend who was quoted around $450. That was 2 years ago though, so things could have changed.
that's what's in my tow rig, it was 380 for an lml or like 800 for a new gm lb7 converter!
 

greg8120

New member
Jun 28, 2014
2
0
0
virginia beach
my 05 LLY is leaking from around the same area from what my wife has told me. i am currently deployed so there is only so much information i am getting on it. she took it to a shop and they said they didn't know where it was coming from and they would have to pull the transmission to find out and the cost just to pull it would be $1400-$1600 and then anywhere from $2000-$3500 to fix. which seems insane to me, so i am trying to get a little more insight on what it could be. she said it leaks from the lower drivers side between the spin on filter and pan. im not sure if the tech she took it to just saw what all was done and thought he could make a few extra dollars or what but any help is greatly appreciated. here is what is done to the truck

05 LLY CC/SB 6 in super lift suspension lift/ 20 moto metal wheels/ 35 in nitto trail grapplers Carillo rods/ Mahle pistons/ Garret gt 46 tr turbo/ Stainless steel boost piping/ Air raid intake / PPE intercooler/ Snow performance MPG max water methanol injection kit/ Dual flexalite electric cooling fans w/ flexalite radiator / DDP 125 HP injectors / Raptor 160 GPH lift pump/ PPE headers / PPE 5 in down pipe to 4 in turbo back silver line exhaust/ ATS triple lock torque converter/ Yukon rear axles /Yukon rear locker w/ 3.73 gear ratio /ARP head studs
 

LWATSON

future trans limpers
Jul 30, 2008
2,587
1
36
55
Scotland Neck NC
It's hard to say what is actually leaking, but what I can tell you is the person that built my trans pulled it out in less than an hour and reinstalled it in about the same amount of time. If they charge $1400.00 to pull and reinstall the trans they are thieves!!!