Automatic Transmission 2-Speed thru 10-Speed GM Autos | Converters | Shift Kits
Sponsored by:
Sponsored by:

Th400 converter turbine locked up

Thread Tools
 
Search this Thread
 
Old Apr 5, 2025 | 07:21 PM
  #1  
mirage2991's Avatar
Thread Starter
Staging Lane
10 Year Member
Photogenic
iTrader: (1)
 
Joined: May 2015
Posts: 84
Likes: 14
From: Charleston SC
Default Th400 converter turbine locked up

New fti sst converter decided to lock its turbine solid for reasons beyond my comprehension.
wasnt doing anything drastic. Drove 3 miles, then wanted to test the stall so put it in 3rd (manual valve body), break stalled it, got some boost built up like 7 psi, let the brakes go and rolled in the throttle.... with street tires that made for a nice smoke show but within second of letting the brakes go, it was game over. Came to a stop, motor stalled out like when you forget to push the clutch on a manual.
converter is out, can confirm i have no turbine rotation in any directions.
Stator moves as it should, smooth (mechanical diode).
sparkles in the fluid out of the converter so looking like a full trans fluid change, new screen and flush out the cooler is in order... yay me... trans has 200 miles and brand new (stage 4 fti).

anyway.... anyone knows why it would do that?
Reply
Old Apr 5, 2025 | 09:15 PM
  #2  
Tranzman's Avatar
TECH Enthusiast
5 Year Member
Liked
Loved
Community Favorite
 
Joined: Jan 2019
Posts: 677
Likes: 490
From: Roxana, IL
Default

Originally Posted by mirage2991
New fti sst converter decided to lock its turbine solid for reasons beyond my comprehension.
wasnt doing anything drastic. Drove 3 miles, then wanted to test the stall so put it in 3rd (manual valve body), break stalled it, got some boost built up like 7 psi, let the brakes go and rolled in the throttle.... with street tires that made for a nice smoke show but within second of letting the brakes go, it was game over. Came to a stop, motor stalled out like when you forget to push the clutch on a manual.
converter is out, can confirm i have no turbine rotation in any directions.
Stator moves as it should, smooth (mechanical diode).
sparkles in the fluid out of the converter so looking like a full trans fluid change, new screen and flush out the cooler is in order... yay me... trans has 200 miles and brand new (stage 4 fti).

anyway.... anyone knows why it would do that?
Sounds to me like someone made a mistake... Not you!
Reply
Old Apr 5, 2025 | 09:59 PM
  #3  
mirage2991's Avatar
Thread Starter
Staging Lane
10 Year Member
Photogenic
iTrader: (1)
 
Joined: May 2015
Posts: 84
Likes: 14
From: Charleston SC
Default

Originally Posted by Tranzman
Sounds to me like someone made a mistake... Not you!
yeah, new one for me... would love to know what went wrong. I'll be calling them monday am for my next step (which I assume will be shipping it back to them).

Reply
Old Apr 8, 2025 | 10:24 AM
  #4  
FTICONVERTERS's Avatar
LS1Tech Sponsor
15 Year Member
Liked
Loved
Community Favorite
iTrader: (3)
 
Joined: Aug 2007
Posts: 1,376
Likes: 96
From: Deland, FL
Default

Originally Posted by mirage2991
yeah, new one for me... would love to know what went wrong. I'll be calling them monday am for my next step (which I assume will be shipping it back to them).
Mirage, if you haven't called us already. give me a call. I can get you a return and get the converter here for inspection ASAP so we can get it fixed for you.

-Dalton
__________________
FTI COMPETITION CONVERTERS AND TRANSMISSIONS
"IT'S NOT CHEATING, IT'S THE COMPETITIVE EDGE."
1-866-726-8358
info@ftiperformance.com
FTIPerformance.com
FTI Converter build sheet

Reply
Old Apr 8, 2025 | 10:57 AM
  #5  
mirage2991's Avatar
Thread Starter
Staging Lane
10 Year Member
Photogenic
iTrader: (1)
 
Joined: May 2015
Posts: 84
Likes: 14
From: Charleston SC
Default

Originally Posted by FTICONVERTERS
Mirage, if you haven't called us already. give me a call. I can get you a return and get the converter here for inspection ASAP so we can get it fixed for you.

-Dalton
I called monday am and sent it out ups on my dime that day. I can't recall whom i talked to. As an aerospace engineer i am really interested to know what went. My educated guess would be something like a washer or Torrington bearing not properly hardened from the oem or maybe the tolerances went out after welding.
S happen but that trans is brand new to (200 miles)... one of your stage 4... hope it's ok! (I think it is but will pull pan later this week)
Reply
Old Apr 8, 2025 | 11:26 AM
  #6  
FTICONVERTERS's Avatar
LS1Tech Sponsor
15 Year Member
Liked
Loved
Community Favorite
iTrader: (3)
 
Joined: Aug 2007
Posts: 1,376
Likes: 96
From: Deland, FL
Default

Originally Posted by mirage2991
I called Monday am and sent it out ups on my dime that day. I can't recall whom i talked to. As an aerospace engineer i am really interested to know what went. My educated guess would be something like a washer or Torrington bearing not properly hardened from the oem or maybe the tolerances went out after welding.
S happen but that trans is brand new to (200 miles)... one of your stage 4... hope it's ok! (I think it is but will pull pan later this week)
Can I offer some extra FTI merch like a couple shirts or a hoodie in exchange for the freight you covered? We'll know if the transmission needs to be looked at after we cut the converter open. Based on my suspicions I think the transmission will be ok. but if it does need attention I will make sure we take care of that for you too since it is one of our transmissions.

Can you PM me your name and address please? that way I can get right on the converter as soon as it comes in.

-Dalton
__________________
FTI COMPETITION CONVERTERS AND TRANSMISSIONS
"IT'S NOT CHEATING, IT'S THE COMPETITIVE EDGE."
1-866-726-8358
info@ftiperformance.com
FTIPerformance.com
FTI Converter build sheet

Reply
Old Apr 8, 2025 | 12:33 PM
  #7  
mirage2991's Avatar
Thread Starter
Staging Lane
10 Year Member
Photogenic
iTrader: (1)
 
Joined: May 2015
Posts: 84
Likes: 14
From: Charleston SC
Default

Originally Posted by FTICONVERTERS
Can I offer some extra FTI merch like a couple shirts or a hoodie in exchange for the freight you covered? We'll know if the transmission needs to be looked at after we cut the converter open. Based on my suspicions I think the transmission will be ok. but if it does need attention I will make sure we take care of that for you too since it is one of our transmissions.

Can you PM me your name and address please? that way I can get right on the converter as soon as it comes in.

-Dalton
Thanks Dalton, I appreciate the support! I sent you a pm.
Reply
Old Apr 8, 2025 | 04:38 PM
  #8  
bbond105's Avatar
TECH Junkie
10 Year Member
Liked
Loved
Community Favorite
 
Joined: May 2012
Posts: 3,046
Likes: 713
From: Poplarville, MS
Default

Originally Posted by FTICONVERTERS
Can I offer some extra FTI merch like a couple shirts or a hoodie in exchange for the freight you covered? We'll know if the transmission needs to be looked at after we cut the converter open. Based on my suspicions I think the transmission will be ok. but if it does need attention I will make sure we take care of that for you too since it is one of our transmissions.

Can you PM me your name and address please? that way I can get right on the converter as soon as it comes in.

-Dalton
Can't ask for much more than that, Dalton and FTI are one the ball. That's great customer service.
Reply
Old Apr 8, 2025 | 07:26 PM
  #9  
mirage2991's Avatar
Thread Starter
Staging Lane
10 Year Member
Photogenic
iTrader: (1)
 
Joined: May 2015
Posts: 84
Likes: 14
From: Charleston SC
Default

Originally Posted by bbond105
Can't ask for much more than that, Dalton and FTI are one the ball. That's great customer service.
I agree!
Reply
Old Apr 10, 2025 | 04:30 PM
  #10  
mirage2991's Avatar
Thread Starter
Staging Lane
10 Year Member
Photogenic
iTrader: (1)
 
Joined: May 2015
Posts: 84
Likes: 14
From: Charleston SC
Default

Converter is on its way back to me thanks to Dalton who took care of it right away. Could not ask for a quicker turn sound. Literally got it wed afternoon and done today (Thursday).

looking forward to cruising again!!!
Reply
Old Apr 10, 2025 | 04:46 PM
  #11  
bbond105's Avatar
TECH Junkie
10 Year Member
Liked
Loved
Community Favorite
 
Joined: May 2012
Posts: 3,046
Likes: 713
From: Poplarville, MS
Default

Wow!!! That was fast.
Reply
Old Apr 10, 2025 | 05:00 PM
  #12  
FTICONVERTERS's Avatar
LS1Tech Sponsor
15 Year Member
Liked
Loved
Community Favorite
iTrader: (3)
 
Joined: Aug 2007
Posts: 1,376
Likes: 96
From: Deland, FL
Default

Happy to be of service!

-Dalton
__________________
FTI COMPETITION CONVERTERS AND TRANSMISSIONS
"IT'S NOT CHEATING, IT'S THE COMPETITIVE EDGE."
1-866-726-8358
info@ftiperformance.com
FTIPerformance.com
FTI Converter build sheet

Reply
Old Apr 11, 2025 | 01:12 AM
  #13  
91 Z28's Avatar
TECH Fanatic
5 Year Member
Photogenic
Photoriffic
Liked
iTrader: (3)
 
Joined: Oct 2016
Posts: 1,581
Likes: 373
From: Armstrong BC
Default

Hell yea that's wild how fast it got turned around!! FTI for the win
Reply




All times are GMT -5. The time now is 11:59 PM.