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Weird downshifting.

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Old 06-20-2010, 12:52 PM   #1
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Weird downshifting.

When I let off the gas to coast it feels like my truck has a retarder system that slows it down and drops to a lower gear right away. Does anyone else have this issue? I searched the Tranny flash TSB but I thought that was just to help it shift smoother into higher gears.

Oh yeah its an automatic 4.0 with no mods to engine.
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Old 06-20-2010, 01:00 PM   #2
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Found my answer. I read the TSB wrong. Mods you can delete.

"To enhance shifting performance and smoothness below 20 mph during the 2-1 downshift on vehicles equipped with an A750 transmission, the Engine Control Module/ECM"

Edit - dangit I am going thru the TSB again and it says "ONLY WHEN ACCELARATING".
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Old 06-20-2010, 01:07 PM   #3
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Quote:
Originally Posted by Andrew H View Post
When I let off the gas to coast it feels like my truck has a retarder system that slows it down and drops to a lower gear right away. Does anyone else have this issue? I searched the Tranny flash TSB but I thought that was just to help it shift smoother into higher gears.

Oh yeah its an automatic 4.0 with no mods to engine.


Normal. The fuel injectors kick off while coasting at a sufficient speed. It feels like a downshift but if you look at your tach the RPMs shouldn't change immediately. If you continue to slow down while coasting then you will eventually downshift.


The TSB you're reading typically happens when accelerating at slow speed, often when rounding corners or something similar. You try to accelerate but the truck seemingly can't find the right gear so it lags a second or so before acceleration starts. I had this as well and that TSB cleaned up the behavior almost completely.
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Old 06-20-2010, 01:11 PM   #4
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Quote:
Originally Posted by SlurpeeBlueMetallic View Post
Normal. The fuel injectors kick off while coasting at a sufficient speed. It feels like a downshift but if you look at your tach the RPMs shouldn't change immediately. If you continue to slow down while coasting then you will eventually downshift.


The TSB you're reading typically happens when accelerating at slow speed, often when rounding corners or something similar. You try to accelerate but the truck seemingly can't find the right gear so it lags a second or so before acceleration starts. I had this as well and that TSB cleaned up the behavior almost completely.
Thanks man. rep given.
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Old 06-20-2010, 01:13 PM   #5
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TSB is for acceleration.

The slight slowing that feels like a downshift is a normal designed part of the trucks...I love it...feels almost like an engine brake assist
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Old 06-20-2010, 04:51 PM   #6
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Quote:
Originally Posted by Andrew H View Post
Thanks man. rep given.
You're welcome. It took me a bit to get used to the injectors turning off while coasting but I worked it into my driving style and it's a major way to get good mileage out of these trucks.

If you're having cornering/acceleration problems like described in the TSB I highly recommend the re-flash as it makes driving around town and in parking lots much smoother.
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Old 06-20-2010, 05:04 PM   #7
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Quote:
Originally Posted by SlurpeeBlueMetallic View Post
You're welcome. It took me a bit to get used to the injectors turning off while coasting but I worked it into my driving style and it's a major way to get good mileage out of these trucks.

If you're having cornering/acceleration problems like described in the TSB I highly recommend the re-flash as it makes driving around town and in parking lots much smoother.

No the cornering and acceleration is fine. Well I am assuming it is I havent felt anything strange. Just wasn't used to the feel of the fuel injectors shutting off you like explained. Only my second week owning the 2nd gen so I am sure I'll get used to it.
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Old 06-20-2010, 05:05 PM   #8
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Quote:
Originally Posted by SlurpeeBlueMetallic View Post
You're welcome. It took me a bit to get used to the injectors turning off while coasting but I worked it into my driving style and it's a major way to get good mileage out of these trucks.

If you're having cornering/acceleration problems like described in the TSB I highly recommend the re-flash as it makes driving around town and in parking lots much smoother.
I get this all the time and it is really annoying, I'm guessing you go to a dealer to get this done? Or can I use a scanner?
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Old 06-20-2010, 05:28 PM   #9
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Quote:
Originally Posted by MontanaTaco View Post
I get this all the time and it is really annoying, I'm guessing you go to a dealer to get this done? Or can I use a scanner?
For the weird shifting at low speeds? Check the TSB here and take it to a dealer if you're still under warranty. It makes world of difference.
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Old 06-20-2010, 06:49 PM   #10
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Quote:
Originally Posted by SlurpeeBlueMetallic View Post
For the weird shifting at low speeds? Check the TSB here and take it to a dealer if you're still under warranty. It makes world of difference.
My 08 does the weird shifting, is this only for 09's?
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Old 06-20-2010, 06:51 PM   #11
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Whoops, I missed that in your info... bump to see if anyone with an '08 had similar and maybe knows of another TSB.
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Old 06-20-2010, 06:58 PM   #12
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it took me a while to get use to the engine braking but it helps save gas and less wear on the brakes as well
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