Late/slow shifting
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Cargo Master
Joined: Oct 2010
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From: barton city mi
Late/slow shifting
I just put a Roush exhaust system on, and noticed my trans shift pointes may have changed. It likely was like this before but not noticed because of the silence of the stock exhaust.
Bear with me. When shifting through the first 4 gears, the dash indicator and seat of the pants tells me it shifted, then within a couple seconds, it "feels" and sounds like it shifts again, although no indication on the dash.
It seems to wind out 4th gear for an extremely long time, as well as 5th. I've found myself backing off slightly to get it to shift, then just resume with same foot pressure.
When just before, about ten feet, of coming to a stop, the engine speeds up, you can see it on the tach, about 150 rpm's, then settles back to idle. You can even feel the truck wants to accelerate, it wouldn't be much, but I've never experienced this before.
As stated, I never noticed this before, and am having a hard time thinking the new exhaust may have caused this, but with the electronic wonderments on these trucks, I just don't know.
BTW, trans was not in the tow/haul mode, or manual.
Anyone?
Bear with me. When shifting through the first 4 gears, the dash indicator and seat of the pants tells me it shifted, then within a couple seconds, it "feels" and sounds like it shifts again, although no indication on the dash.
It seems to wind out 4th gear for an extremely long time, as well as 5th. I've found myself backing off slightly to get it to shift, then just resume with same foot pressure.
When just before, about ten feet, of coming to a stop, the engine speeds up, you can see it on the tach, about 150 rpm's, then settles back to idle. You can even feel the truck wants to accelerate, it wouldn't be much, but I've never experienced this before.
As stated, I never noticed this before, and am having a hard time thinking the new exhaust may have caused this, but with the electronic wonderments on these trucks, I just don't know.
BTW, trans was not in the tow/haul mode, or manual.
Anyone?
Former Vendor
Joined: Mar 2009
Posts: 8,098
Likes: 10
From: Westford, MA
If you haven't changed the tranny fluid and filter in a while you might want to get all of the tranny fluid out of the transmission, replace it with new fluid and a fresh filter.
That may resolve the issue for you.
That may resolve the issue for you.
Moderator
Joined: Jul 2011
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From: Sioux Falls Area
the truck is responding to your new exhaust the same way your right foot is responding to the new sound.
i'm betting the truck has learned that you like the sound of your new exhaust.
i too have felt the surge close to stop you mention. if you find a fix, let me know. our subaru is terrible with that too.
i'm betting the truck has learned that you like the sound of your new exhaust.
i too have felt the surge close to stop you mention. if you find a fix, let me know. our subaru is terrible with that too.
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Cargo Master
Joined: Oct 2010
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From: barton city mi
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Cargo Master
Joined: Oct 2010
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From: barton city mi
the truck is responding to your new exhaust the same way your right foot is responding to the new sound.
i'm betting the truck has learned that you like the sound of your new exhaust.
i too have felt the surge close to stop you mention. if you find a fix, let me know. our subaru is terrible with that too.
i'm betting the truck has learned that you like the sound of your new exhaust.
i too have felt the surge close to stop you mention. if you find a fix, let me know. our subaru is terrible with that too.
I had my "trusted" mechanic do the install for me. My shoulder is screwed up, so I can't work over my head for awhile. I'll call and ask him Monday. He may have, I noticed on the display that my gear display wasn't there when I got back in the truck.
Why would you disconnect the battery when doing this. It seems lately, some of the "how to's" I've read, say to disconnect the battery, pull the E brake, put in neutral, etc., etc., etc. I thought it was just protecting themselves from lawsuits from the Darwin awards class. But now I'm wondering what's next. Change out a lightbulb and do all of the above?LOL
That surge is odd for sure, if I find the fix, I'll post it.
This morning on my way home, I put the tranny in manual, and ran through the gears, shifting it when I felt it should shift, right about 1500 rpm. Then put it back to D. I noticed the next turn I made, it went down to 3rd, and then shifted closer to where I think it should. Maybe what you guys said is what it's doing. I hope, but a truck with Alzheimers? LOL
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Cargo Master
Joined: Oct 2010
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From: barton city mi
Just got back from a grocery run, 35 miles roundtrip, up and down hills, and a couple stopsigns. The tranny appears to be shifting as usual again, except for it shifting from 5th to 4th, and 6th to 5th. I know full well it shifted, but my display doesn't always show it. The rpm gain just before a stop, seems to be intermittent as well now.
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Cargo Master
Joined: Oct 2010
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From: barton city mi
Lead Driver
Joined: Feb 2011
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From: Milford, MI
Hi John. Sounds like you may now be detecting the point at which the torque converter locks up while you accelerate (trans computer adapts that too). Did your tech weld the exhaust together? Battery would have been disconnected for protection of the trucks electronics.
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Cargo Master
Joined: Oct 2010
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From: barton city mi
Hi right back Chad. What you're saying makes sense about the torque converter. That would be why it seemed like the extra gear between shift indications. That is gone for the most part now, except going up a steep hill where you would expect the trans to downshift.
Tell me if I'm wrong, but does the torque converter lockup at the shift pointe normally? I'm going with the seat of the pants feel, and watching the tach and gear selector. I never felt that before.
Sounds like the "surge" is being caused by the torque converter unlocking just before a stop?
I guess I shouldn't have waited 12 years before buying another automatic, that 4R100 in the olde stroker never made me wonder what was going on. A lot has changed, and no one ever told me.LOL
Tell me if I'm wrong, but does the torque converter lockup at the shift pointe normally? I'm going with the seat of the pants feel, and watching the tach and gear selector. I never felt that before.
Sounds like the "surge" is being caused by the torque converter unlocking just before a stop?
I guess I shouldn't have waited 12 years before buying another automatic, that 4R100 in the olde stroker never made me wonder what was going on. A lot has changed, and no one ever told me.LOL
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Cargo Master
Joined: Oct 2010
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From: barton city mi
Seems things are working the way they should again. Yes, my torque converter locks up about half way through 3rd, now that I've got a better handle on how this thing works, I'm feeling better about it. The last automatic I bought, '01 SD, the trans was replaced around 26k, there was a defect with a lot of them, something about the casting/machining process, IIRC. They'd overheat and not go into 3rd. I was thinking I had another bad one, and it was only coincidental with the new exhaust.
Believe me though, I'm keeping a close eye on it, probably for a long time.
On edit; Just talked to my mechanic. The battery was not disconnected, and there was no welding. Talking with him, we think what has happened is that the ECM and other controls, are seeing a reduction in back pressure. So, since it appears all this is tied together, the truck is relearning my style of driving, just as was mentioned earlier.
Well, I've got to be more careful, I learned a few things in this thread. Thanks all.
Believe me though, I'm keeping a close eye on it, probably for a long time.
On edit; Just talked to my mechanic. The battery was not disconnected, and there was no welding. Talking with him, we think what has happened is that the ECM and other controls, are seeing a reduction in back pressure. So, since it appears all this is tied together, the truck is relearning my style of driving, just as was mentioned earlier.
Well, I've got to be more careful, I learned a few things in this thread. Thanks all.
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