TH200 issue

Billy Nees · 04-13-2014, 12:50 PM

Broken stator support.

Alan Roehrich · 04-13-2014, 01:01 PM

Billy, that should stop the converter from reaching full stall speed or flash stall speed. Normally. It's a common problem with big engines, but I don't see it too often with small blocks, especially in Stock.

countrypuppy4865 · 04-13-2014, 02:53 PM

What Billy said had it happen car leaves terrible. Pull the tranny out and when you pull convertor out you will be able to see if it's broke.

Alan Roehrich · 04-13-2014, 03:03 PM

A stator shaft problem should show up on a data logger in a very obvious manner. The starting line RPM should be substantially lower, at least 2000 RPM lower than a previous "good pass". When the stator shaft spins, the converter will not flash, and it will not multiply torque.

With clutches, or the "sprag", RPM should be slightly higher, but driveshaft RPM should be lower.

Chad Rhodes · 04-13-2014, 03:20 PM

Quote:

Originally Posted by Alan Roehrich

A stator shaft problem should show up on a data logger in a very obvious manner. The starting line RPM should be substantially lower, at least 2000 RPM lower than a previous "good pass". When the stator shaft spins, the converter will not flash, and it will not multiply torque.

With clutches, or the "sprag", RPM should be slightly higher, but driveshaft RPM should be lower.

The Converter flash seemed a little high as well now that I look at the data, it also ran within .3 mph of what it had all day. I'll have it out this week

jim powers · 04-13-2014, 05:56 PM

i agree with Billy, broken stator support, did the same thing back in 09 with my 305 k/sa camaro

Gary Parker · 04-13-2014, 07:16 PM

I have broken 2 stator supports. some are now changing them with a heavier one I believe adapting a turbo 350 one... that's what it sounds like to me

Mark Yacavone · 04-13-2014, 08:14 PM

Quote:

Originally Posted by Alan Roehrich

Billy, that should stop the converter from reaching full stall speed or flash stall speed. Normally. It's a common problem with big engines, but I don't see it too often with small blocks, especially in Stock.

As stated, it won't stall up with stator free wheeling..It'll just act like a stock converter almost.
The low sprag is the weak spot alright.
You need to find out if the lo/rev clutches are on or off with your valve body.
If off ,and just the forward clutch on, I'm going with the sprag slipping..
Probably find broken springs and distortion on some kind...

Chad Rhodes · 04-13-2014, 08:23 PM

Quote:

Originally Posted by Mark Yacavone

As stated, it won't stall up with stator free wheeling..It'll just act like a stock converter almost.
The low sprag is the weak spot alright.
You need to find out if the lo/rev clutches are on or off with your valve body.
If off ,and just the forward clutch on, I'm going with the sprag slipping..
Probably find broken springs and distortion on some kind...

It's a turbo action e shift if anyone knows the answer before I call tomorrow.

Dean Feiock · 04-13-2014, 08:34 PM

If you have engine breaking in 1st gear, then the clutches are on.

04-13-2014, 12:50 PM	#1
Billy Nees VIP Member Join Date: Oct 2002 Location: On a hilltop in Pa. Posts: 4,519 Likes: 3,633 Liked 7,925 Times in 1,760 Posts	Re: TH200 issue Broken stator support. __________________ Billy Nees 1188 STK, SS I'm not spending 100K to win 2K

04-13-2014, 01:01 PM	#2
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,144 Likes: 1,623 Liked 1,955 Times in 440 Posts	Re: TH200 issue Billy, that should stop the converter from reaching full stall speed or flash stall speed. Normally. It's a common problem with big engines, but I don't see it too often with small blocks, especially in Stock. __________________ Alan Roehrich 212A G/S

04-13-2014, 02:53 PM	#3
countrypuppy4865 Senior Member Join Date: Nov 2003 Location: Donaldsonville, LA Posts: 984 Likes: 17 Liked 229 Times in 71 Posts	Re: TH200 issue What Billy said had it happen car leaves terrible. Pull the tranny out and when you pull convertor out you will be able to see if it's broke. __________________ Jimmy "Cooter" Hidalgo, Jr. 4865 E/SA '04 GTO 4865 SS/GA '99 Firebird

04-13-2014, 03:03 PM	#4
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,144 Likes: 1,623 Liked 1,955 Times in 440 Posts	Re: TH200 issue A stator shaft problem should show up on a data logger in a very obvious manner. The starting line RPM should be substantially lower, at least 2000 RPM lower than a previous "good pass". When the stator shaft spins, the converter will not flash, and it will not multiply torque. With clutches, or the "sprag", RPM should be slightly higher, but driveshaft RPM should be lower. __________________ Alan Roehrich 212A G/S

04-13-2014, 05:56 PM	#6
jim powers Member Join Date: Nov 2001 Location: manville nj Posts: 359 Likes: 198 Liked 13 Times in 10 Posts	Re: TH200 issue i agree with Billy, broken stator support, did the same thing back in 09 with my 305 k/sa camaro

04-13-2014, 07:16 PM	#7
Gary Parker Senior Member Join Date: Apr 2004 Location: Westfield Mass Posts: 529 Likes: 370 Liked 425 Times in 56 Posts	Re: TH200 issue I have broken 2 stator supports. some are now changing them with a heavier one I believe adapting a turbo 350 one... that's what it sounds like to me __________________ Gary Parker 1617 STK

04-13-2014, 08:34 PM	#10
Dean Feiock Member Join Date: Aug 2002 Location: Pierre, SD Posts: 204 Likes: 0 Liked 49 Times in 15 Posts	Re: TH200 issue If you have engine breaking in 1st gear, then the clutches are on. __________________ Dean Feiock -- Stock 5002

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