Transmission shift issues..... Help
Thread Starter
Instructor
Joined: Oct 2009
Posts: 159
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From: Springfield MO.
Transmission shift issues..... Help
I'm having an issue with my 2nd to 3rd shift on my Built 4l60e.... *Took it to the track for the first time last weekend and it's bouncing off the limiter(7,000rpm) before shifting into 3rd.... My tuner logged all my passes and adjust the mph and rpm setting in the tranny tune where they need to be... He also tried to set the shift rpm and mph low just to see if it would short shift and it keeps hitting the limiter.I've triple checked the fluid....and it doesn't throw any codes.On the street it shifts fine and every shift is nice a firm... **The log doesn't show any slipping at all.... The tranny only has about 3-4,000 miles on it.... Solenoid bad possibly??? *It's only 2nd to 3rd.. And my tuner has tried everything... On the log it just passes the mph setting and rpm setting in the tune... It's seems like there is a long delay from the tranny and the computer telling it to shift. *Any ideas will help ********Thanks. * It's a built 4l60e,yank ss3600, 3.73gears. Chad
Le Mans Master
Joined: May 2006
Posts: 7,803
Likes: 205
From: Hillsboro OR
I'm having an issue with my 2nd to 3rd shift on my Built 4l60e.... *Took it to the track for the first time last weekend and it's bouncing off the limiter(7,000rpm) before shifting into 3rd.... My tuner logged all my passes and adjust the mph and rpm setting in the tranny tune where they need to be... He also tried to set the shift rpm and mph low just to see if it would short shift and it keeps hitting the limiter.I've triple checked the fluid....and it doesn't throw any codes.On the street it shifts fine and every shift is nice a firm... **The log doesn't show any slipping at all.... The tranny only has about 3-4,000 miles on it.... Solenoid bad possibly??? *It's only 2nd to 3rd.. And my tuner has tried everything... On the log it just passes the mph setting and rpm setting in the tune... It's seems like there is a long delay from the tranny and the computer telling it to shift. *Any ideas will help ********Thanks. * It's a built 4l60e,yank ss3600, 3.73gears. Chad
That's all I got
Le Mans Master
Joined: May 2006
Posts: 7,803
Likes: 205
From: Hillsboro OR
Because are having an issue with hitting the rev limiter going to 3rd, I was suggesting that you compare the values in the two tables. The first table being the Maximum WOT MPH for each gear. Compare the max. WOT MPH value (specifically 2nd gear) to the MPH upshift value in the Part Throttle Shift table (specifically 2nd to 3rd) that state when it is OK to shift to the next higher gear (upshift). If the value in the PT 2 to 3 upshift MPH value is > the WOT 2nd gear maximum MPH value, you will hit the limiter and not shift.
I hope this clears it up.
Last edited by Bluefire; Oct 6, 2011 at 03:54 AM.
Thread Starter
Instructor
Joined: Oct 2009
Posts: 159
Likes: 0
From: Springfield MO.
Went to the track tonight. Still hitting limiter 2-3.... My tuner adjusted....WOT Upshift 2-3 down to 65mph and my WOT rpm 2-3 to 5900.... It satisfies the mph and rpm and still doesn't shift. All the WOT tables and part throttle tables match,,,,,, I'm at a lost. My 3-2 downshift is at 61 mph. So it's lower than my upshift. Any ideas????? He looked through the tranny tune and said everything looks good and can't figure out why it's not shifting..... Limiter is at 7000
Safety Car
Joined: Aug 2000
Posts: 4,154
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From: Murphy TX
Cruise-In II Veteran
You can look at things like when is the gear shift commanded, how high the engine revs during the shift, how long is the shift taking, and so forth using your scanner in order to determine if the behavior you're seeing is actually before, during, or after the shift. You really only have control over when the shift starts and how long you want it to take. You might get pointed in the right direction if you can verify whether or not the shift has been commanded when you think it should be. Can't tell from your original post if the long delay you mention is from your scans or just a 'feels like'.
