What gear? - Page 2 - Fiberglass RV


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Old 02-19-2012, 02:43 PM   #15
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Name: Michael
Trailer: Li'l Hauley
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Originally Posted by BCDave View Post
Its not the trans that is slipping when the T/C is unlocked - it is t/c itself that now slips.

If you shift down out of O/D, it will be unlocked all the time, so moving the lever down to D (from O/D) you get the full "down one gear PLUS unlocked" effect. It will only lock in the highest gear, so unless you are in O/D, it cannot do the 400 or 500 RPM thing.

However - if you are NOT in O/D, and you lightly step on and off the gas pedal a couple of times (without actually changing speed of the vehicle), you will likely get a "bounce' in RPM of the same amount as you put "tension" on it and then back off. Adding gas brings it up to its max slip, while getting off the gas shows what the rpm would be if it was locked.
I don't get that RPM 'bounce', though. So maybe mine is locked up in 4th. We both got a PM from another member who said his Sienna's converter is locked up in 4th as well as 5th.

Thanks for clarifying about what is slipping and what's not. I'm never too old to learn something.
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Old 02-19-2012, 03:07 PM   #16
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Name: Dave
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I was not aware that some systems can lock up the T/C in gears other than highest - but then to me a 'new" vehicle is anything newer than the 1990's!
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Old 02-19-2012, 03:19 PM   #17
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Name: Jesse
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Originally Posted by BCDave
I was not aware that some systems can lock up the T/C in gears other than highest - but then to me a 'new" vehicle is anything newer than the 1990's!
My TC locks up at about 15 MPH and stays locked through all gears. Well, I don't really have gears, but the TC stays locked until the car slows to only 10 MPH or so, then unlocks. Newfangled technology!
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Old 02-19-2012, 03:27 PM   #18
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I was not aware that some systems can lock up the T/C in gears other than highest - but then to me a 'new" vehicle is anything newer than the 1990's!
Automatic transmissions have changed a lot in the past 10 years in the quest for greater fuel economy. More lock up, more gears.
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