convertor stall problem

astikhossw · 07-26-2010, 03:17 PM

Maybe,the last couple of times at the track i have been having this problem with my stall speed changing, i would trans break stall it in the pits and it would zing right up to 6600 but when i would stage and come up on the break it would only go up to 3500 and that would make for a very lazy run.Has anyone else had this problem and am i thinking right that this is a convertor problem.

Mark Yacavone · 07-26-2010, 04:31 PM

It could very well be a sprag problem . If the sprag is not holding the stator in a fixed position, you'll have no torque multiplication and a very low stall speed.
What size , make, etc? Is it designed for trans brake usage?

astikhossw · 07-26-2010, 04:45 PM

8 inch built by mike munsinger and built to be used with trans brake.

Mark Yacavone · 07-26-2010, 05:03 PM

Maybe you could talk to Mike about converting it to a mechanical diode type of sprag. That is, if he's available and not too busy,

Dave Ribeiro · 07-26-2010, 05:14 PM

It sounds like a sprag problem, just as Mark said ... I had one go and the car wouldn't leave the line and started to pop ..
It wouldn't stall above 2,500 on the starting line and felt real flat, lost ET & MPH big time.... Get someone to look at it ASAP.....

astikhossw · 07-26-2010, 07:07 PM

Good i thought that may be the problem, i am in the middle of changing out the transmission and did'nt want to put it back in and have the same problem pop up and by the way i am only changing to another powerglide with higher ratio.Thanks guy's

Alan Roehrich · 07-26-2010, 08:03 PM

More likely, the stator shaft in the pump is slipping. A sprag usually is either good, or bad, it either holds, or it doesn't. If it works, then doesn't work, then works again, it is most often a slipping stator shaft in the pump. Have the converter repaired because the stator shaft slipping can damage the converter. But it sounds a lot like the stator shaft is slipping.

astikhossw · 07-27-2010, 02:09 PM

So, do you know why a stator shaft would fail,and what would be the likely cause of a sprag to fail.The reason i ask is i need to know if it is something that i am doing are is just routine maintenance.

astikhossw · 08-03-2010, 07:02 PM

Well i took the convertor to the shop and the convertor guy said there was nothing wrong inside the convertor ,so it looks as though i am still left with the same problem.One thing that i am going to do is change transmission,also the trans guy ask me to check the big input shaft to see if it turned and it did not so what was he checking for.

Alan Roehrich · 08-03-2010, 07:08 PM

It's not an input shaft, it's the stator shaft. Did you try to turn it with something similar to Channel Locks? If the problem is intermittent, the stator is probably not hand turning loose. Swap pumps. Did he take the converter apart?

07-26-2010, 03:17 PM	#1
astikhossw Member Join Date: Jul 2008 Location: moreno valley Ca Posts: 266 Likes: 2 Liked 20 Times in 9 Posts	convertor stall problem Maybe,the last couple of times at the track i have been having this problem with my stall speed changing, i would trans break stall it in the pits and it would zing right up to 6600 but when i would stage and come up on the break it would only go up to 3500 and that would make for a very lazy run.Has anyone else had this problem and am i thinking right that this is a convertor problem.

07-26-2010, 04:31 PM	#2
Mark Yacavone Veteran Member Join Date: Mar 2002 Location: Miles From Nowhere Posts: 7,799 Likes: 2,889 Liked 5,091 Times in 1,941 Posts	Re: convertor stall problem It could very well be a sprag problem . If the sprag is not holding the stator in a fixed position, you'll have no torque multiplication and a very low stall speed. What size , make, etc? Is it designed for trans brake usage? __________________ "We are lucky we don't get as much Government as we pay for." Will Rogers

07-26-2010, 04:45 PM	#3
astikhossw Member Join Date: Jul 2008 Location: moreno valley Ca Posts: 266 Likes: 2 Liked 20 Times in 9 Posts	Re: convertor stall problem 8 inch built by mike munsinger and built to be used with trans brake.

07-26-2010, 05:03 PM	#4
Mark Yacavone Veteran Member Join Date: Mar 2002 Location: Miles From Nowhere Posts: 7,799 Likes: 2,889 Liked 5,091 Times in 1,941 Posts	Re: convertor stall problem Maybe you could talk to Mike about converting it to a mechanical diode type of sprag. That is, if he's available and not too busy, __________________ "We are lucky we don't get as much Government as we pay for." Will Rogers

07-26-2010, 05:14 PM	#5
Dave Ribeiro VIP Member Join Date: Sep 2002 Location: Williamsburg, Va.---USA Posts: 1,827 Likes: 1,612 Liked 56 Times in 27 Posts	Re: convertor stall problem It sounds like a sprag problem, just as Mark said ... I had one go and the car wouldn't leave the line and started to pop .. It wouldn't stall above 2,500 on the starting line and felt real flat, lost ET & MPH big time.... Get someone to look at it ASAP..... __________________ Dave Ribeiro 1033 STK

07-26-2010, 07:07 PM	#6
astikhossw Member Join Date: Jul 2008 Location: moreno valley Ca Posts: 266 Likes: 2 Liked 20 Times in 9 Posts	Re: convertor stall problem Good i thought that may be the problem, i am in the middle of changing out the transmission and did'nt want to put it back in and have the same problem pop up and by the way i am only changing to another powerglide with higher ratio.Thanks guy's

07-26-2010, 08:03 PM	#7
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,098 Likes: 1,550 Liked 1,778 Times in 404 Posts	Re: convertor stall problem More likely, the stator shaft in the pump is slipping. A sprag usually is either good, or bad, it either holds, or it doesn't. If it works, then doesn't work, then works again, it is most often a slipping stator shaft in the pump. Have the converter repaired because the stator shaft slipping can damage the converter. But it sounds a lot like the stator shaft is slipping. __________________ Alan Roehrich 212A G/S

07-27-2010, 02:09 PM	#8
astikhossw Member Join Date: Jul 2008 Location: moreno valley Ca Posts: 266 Likes: 2 Liked 20 Times in 9 Posts	Re: convertor stall problem So, do you know why a stator shaft would fail,and what would be the likely cause of a sprag to fail.The reason i ask is i need to know if it is something that i am doing are is just routine maintenance.

08-03-2010, 07:02 PM	#9
astikhossw Member Join Date: Jul 2008 Location: moreno valley Ca Posts: 266 Likes: 2 Liked 20 Times in 9 Posts	Re: convertor stall problem Well i took the convertor to the shop and the convertor guy said there was nothing wrong inside the convertor ,so it looks as though i am still left with the same problem.One thing that i am going to do is change transmission,also the trans guy ask me to check the big input shaft to see if it turned and it did not so what was he checking for.

08-03-2010, 07:08 PM	#10
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,098 Likes: 1,550 Liked 1,778 Times in 404 Posts	Re: convertor stall problem It's not an input shaft, it's the stator shaft. Did you try to turn it with something similar to Channel Locks? If the problem is intermittent, the stator is probably not hand turning loose. Swap pumps. Did he take the converter apart? __________________ Alan Roehrich 212A G/S