TH 350 help

MYLINRACING · 05-29-2016, 08:01 PM

I run a turbo action 350 with a ATI converter, recently the converter would not flash above 4,000 and it a 5,800 stall converter. So we put the spare converter in which is a 5200 and we have the same issue won't go above 4,000. I find it hard to believe i have two bad converters. Any ideas what the problem could be?

Thanks.
Andy Mylin

jmantle · 05-29-2016, 09:30 PM

Quote:

Originally Posted by MYLINRACING

I run a turbo action 350 with a ATI converter, recently the converter would not flash above 4,000 and it a 5,800 stall converter. So we put the spare converter in which is a 5200 and we have the same issue won't go above 4,000. I find it hard to believe i have two bad converters. Any ideas what the problem could be?

Thanks.
Andy Mylin

Put a pair of water pump plyers on the stator support and make sure it won't turn.

Jim Mantle V/SA 6632

Alan Roehrich · 05-29-2016, 09:34 PM

Stator shaft (big splined tube) is possibly loose. Also you could have another pump problem, or valve body problem. Do you run a transmission cooler?

MYLINRACING · 05-29-2016, 09:37 PM

No Sir, I don't run a cooler

Alan Roehrich · 05-29-2016, 10:18 PM

I'm not a sir. Just a guy.

Any other changes before this started?

Checked the basics?

Fluid level?

Ignition sytem?

Fuel system?

Timing?

MYLINRACING · 05-30-2016, 12:55 PM

We have changed just about everything MSD box, coil, fuel pump, fuel reg, Carb, Converter. Trans fluid level looks good and the timing is were it should be. Checked the stator shaft but it is tight. Going to call Turbo Action in the morning and see about a new valve body.

Alan Roehrich · 05-30-2016, 01:06 PM

Do not just replace parts arbitrarily. It has not worked so far, and is not likely to work, at least until you have spent way too much money.

The next thing to do is to perform the appropriate pressure tests on the transmission.

It is the pump that charges the converter with fluid. The valvebody controls line pressure, and as a function of line pressure, there is charge pressure to fill the torque converter with fluid. It is possible that there is one or more problem inside the pump.

HIGHOCTAIN2000 · 05-30-2016, 03:26 PM

if your engine is down on power you will lose stall speed

MYLINRACING · 06-01-2016, 08:31 AM

Engine checks out fine no issues there.

Lou Jeffery · 06-10-2016, 07:31 AM

Did you ever figure out what the issue was? Is it running fine now?

05-29-2016, 08:01 PM	#1
MYLINRACING Junior Member Join Date: Dec 2004 Location: CHARLESTON Posts: 63 Likes: 11 Liked 1 Time in 1 Post	TH 350 help I run a turbo action 350 with a ATI converter, recently the converter would not flash above 4,000 and it a 5,800 stall converter. So we put the spare converter in which is a 5200 and we have the same issue won't go above 4,000. I find it hard to believe i have two bad converters. Any ideas what the problem could be? Thanks. Andy Mylin __________________ Andy Mylin 1987 Pontiac trans am 2441 I/SA

05-29-2016, 09:34 PM	#3
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,090 Likes: 1,534 Liked 1,758 Times in 398 Posts	Re: TH 350 help Stator shaft (big splined tube) is possibly loose. Also you could have another pump problem, or valve body problem. Do you run a transmission cooler? __________________ Alan Roehrich 212A G/S

05-29-2016, 09:37 PM	#4
MYLINRACING Junior Member Join Date: Dec 2004 Location: CHARLESTON Posts: 63 Likes: 11 Liked 1 Time in 1 Post	Re: TH 350 help No Sir, I don't run a cooler __________________ Andy Mylin 1987 Pontiac trans am 2441 I/SA

05-29-2016, 10:18 PM	#5
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,090 Likes: 1,534 Liked 1,758 Times in 398 Posts	Re: TH 350 help I'm not a sir. Just a guy. Any other changes before this started? Checked the basics? Fluid level? Ignition sytem? Fuel system? Timing? __________________ Alan Roehrich 212A G/S

05-30-2016, 12:55 PM	#6
MYLINRACING Junior Member Join Date: Dec 2004 Location: CHARLESTON Posts: 63 Likes: 11 Liked 1 Time in 1 Post	Re: TH 350 help We have changed just about everything MSD box, coil, fuel pump, fuel reg, Carb, Converter. Trans fluid level looks good and the timing is were it should be. Checked the stator shaft but it is tight. Going to call Turbo Action in the morning and see about a new valve body. __________________ Andy Mylin 1987 Pontiac trans am 2441 I/SA

05-30-2016, 01:06 PM	#7
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,090 Likes: 1,534 Liked 1,758 Times in 398 Posts	Re: TH 350 help Do not just replace parts arbitrarily. It has not worked so far, and is not likely to work, at least until you have spent way too much money. The next thing to do is to perform the appropriate pressure tests on the transmission. It is the pump that charges the converter with fluid. The valvebody controls line pressure, and as a function of line pressure, there is charge pressure to fill the torque converter with fluid. It is possible that there is one or more problem inside the pump. __________________ Alan Roehrich 212A G/S

05-30-2016, 03:26 PM	#8
HIGHOCTAIN2000 Junior Member Join Date: Nov 2007 Posts: 27 Likes: 0 Liked 0 Times in 0 Posts	Re: TH 350 help if your engine is down on power you will lose stall speed

06-01-2016, 08:31 AM	#9
MYLINRACING Junior Member Join Date: Dec 2004 Location: CHARLESTON Posts: 63 Likes: 11 Liked 1 Time in 1 Post	Re: TH 350 help Engine checks out fine no issues there. __________________ Andy Mylin 1987 Pontiac trans am 2441 I/SA

06-10-2016, 07:31 AM	#10
Lou Jeffery Junior Member Join Date: Nov 2013 Posts: 91 Likes: 0 Liked 0 Times in 0 Posts	Re: TH 350 help Did you ever figure out what the issue was? Is it running fine now?