4l80e super quick shifting...
Thread Starter
Teching In
Joined: Sep 2020
Posts: 29
Likes: 2
From: Michigan
4l80e super quick shifting... This is a 5.3 from an '01 Silverado which originally had a 4l60 but during my swap I moved to a 4l80e from a vehicle I drove a handful of times and the trans functioned perfectly.
Since getting this build on the road for shakedown, one of the first things I noticed is how quickly it will up shift through the gears.
My first thought is the tune. If all I did in the trans-tune was change trans type from 4l60 to 4l80 (without changing any of the other settings) would this be the obvious result?
Should I start simply by segment swapping a stock 4l80 into my tune to overwrite those 4l60 settings?
( As I type this, I realize how dumb of an inquiry this sounds to be but I'd rather not assume.)
Thanks for any help.
Since getting this build on the road for shakedown, one of the first things I noticed is how quickly it will up shift through the gears.
My first thought is the tune. If all I did in the trans-tune was change trans type from 4l60 to 4l80 (without changing any of the other settings) would this be the obvious result?
Should I start simply by segment swapping a stock 4l80 into my tune to overwrite those 4l60 settings?
( As I type this, I realize how dumb of an inquiry this sounds to be but I'd rather not assume.)
Thanks for any help.
TECH Junkie
Joined: Jun 2008
Posts: 3,203
Likes: 1,391
From: Nitro Alley
What year was the 4L60E and did it use an Input-Shaft Speed Sensor (ISS)?
The 4L80E is a 2001 unit?
Was the 4L80E from a Four Wheel Drive Truck?
If so, did you have an Output-Shaft reluctor and Output-Shaft Speed Sensor installed into the 4L80E.
What did you use for wiring?
Did you use a preexisting wiring harness and modify it for the 4L80E?
Did you swap in a used wiring harness from a 4L80E truck?
Did you use HP-Tuners/ Holley EFI/ Other software and segment swap?
Give us more details and information... the we can proceed.
I am really hoping that you did not install a 4L80E without a Reluctor for the Output-Shaft Speed Sensor.
The 4L80E is a 2001 unit?
Was the 4L80E from a Four Wheel Drive Truck?
If so, did you have an Output-Shaft reluctor and Output-Shaft Speed Sensor installed into the 4L80E.
What did you use for wiring?
Did you use a preexisting wiring harness and modify it for the 4L80E?
Did you swap in a used wiring harness from a 4L80E truck?
Did you use HP-Tuners/ Holley EFI/ Other software and segment swap?
Give us more details and information... the we can proceed.
I am really hoping that you did not install a 4L80E without a Reluctor for the Output-Shaft Speed Sensor.
Thread Starter
Teching In
Joined: Sep 2020
Posts: 29
Likes: 2
From: Michigan
It is.
It was not. it was from a 2WD 2500HD Express van.
The factory 2001 PCM and harness.
No.
Yes HP tuners and MPVI2. I JUST this evening did the segment swap but have not driven it since writing the tune.
Give us more details and information... the we can proceed.
Last edited by swizcore; Apr 19, 2021 at 10:11 PM.
TECH Junkie
Joined: Jun 2008
Posts: 3,203
Likes: 1,391
From: Nitro Alley
If you have a Two Wheel Drive vehicle, then you want a 4L80E from a Two Wheel Drive truck.
The Two Wheel Drive version of the 4L80E has a Reluctor and sensor for the Output-Shaft.
This is needed for a Stock style configuration Speedometer.
Four Wheel Drive 4L80E units do not use a Reluctor or Sensor for the Output-Shaft.
The Transfer-Case that attaches to the back of the 4L80E already has a Reluctor and Sensor for this purpose.
There is no need to have these components in the 4L80E if the Transfer-Case already has these components...
If would be redundant.
Segment swap done, good.
You have to look at the tune and see what is configured for vehicle speed on the shift tables.
Also make certain that the Ring and Pinion ratio is correctly entered...
as well as the tire height.
The Two Wheel Drive version of the 4L80E has a Reluctor and sensor for the Output-Shaft.
This is needed for a Stock style configuration Speedometer.
Four Wheel Drive 4L80E units do not use a Reluctor or Sensor for the Output-Shaft.
The Transfer-Case that attaches to the back of the 4L80E already has a Reluctor and Sensor for this purpose.
There is no need to have these components in the 4L80E if the Transfer-Case already has these components...
If would be redundant.
Segment swap done, good.
You have to look at the tune and see what is configured for vehicle speed on the shift tables.
Also make certain that the Ring and Pinion ratio is correctly entered...
as well as the tire height.
Thread Starter
Teching In
Joined: Sep 2020
Posts: 29
Likes: 2
From: Michigan
Went for a drive tonight after doing the segment swap and verifying the reared ratio was correct but it's still doing the same thing.
As soon as I take off at gradual throttle, it instantly shifts into second and then third.
As soon as I take off at gradual throttle, it instantly shifts into second and then third.
TECH Junkie
Joined: Jun 2008
Posts: 3,203
Likes: 1,391
From: Nitro Alley
Are you certain that both the Input-Speed and Output-Speed sensors are connected and operating properly.
As human beings; it us unfortunately natural that we overlook things (sometimes quite often too).
Often we go to look for an object, but overlook it.
Example:
We need our car keys, that are somewhere in our home... we can't find the keys after going through the entire house three times.
The next thing we know... the car keys were right in front of us (in plain site the entire time) on a shelf, next to the door to exit the house.
We get so focused on finding the car keys, that we lose sight of them... even though they are right in our face.
My point is... take a look at everything again...
Go slowly, focusing on each individual step... and NOT the end-goal.
Often we find that we missed something that was right in front of us the entire time.
Good luck.
Thread Starter
Teching In
Joined: Sep 2020
Posts: 29
Likes: 2
From: Michigan
Do you have absolutely no Diagnostic Trouble Codes?
Are you certain that both the Input-Speed and Output-Speed sensors are connected and operating properly.
As human beings; it us unfortunately natural that we overlook things (sometimes quite often too).
Often we go to look for an object, but overlook it.
Example:
We need our car keys, that are somewhere in our home... we can't find the keys after going through the entire house three times.
The next thing we know... the car keys were right in front of us (in plain site the entire time) on a shelf, next to the door to exit the house.
We get so focused on finding the car keys, that we lose sight of them... even though they are right in our face.
My point is... take a look at everything again...
Go slowly, focusing on each individual step... and NOT the end-goal.
Often we find that we missed something that was right in front of us the entire time.
Good luck.
Are you certain that both the Input-Speed and Output-Speed sensors are connected and operating properly.
As human beings; it us unfortunately natural that we overlook things (sometimes quite often too).
Often we go to look for an object, but overlook it.
Example:
We need our car keys, that are somewhere in our home... we can't find the keys after going through the entire house three times.
The next thing we know... the car keys were right in front of us (in plain site the entire time) on a shelf, next to the door to exit the house.
We get so focused on finding the car keys, that we lose sight of them... even though they are right in our face.
My point is... take a look at everything again...
Go slowly, focusing on each individual step... and NOT the end-goal.
Often we find that we missed something that was right in front of us the entire time.
Good luck.
I thought this was due to me not having wired it to my brake switch but I did that on Sunday and the code still exists.
I know this is going to be something silly, that's how this build has gone during final assembly.
I'm going to record a scan log tomorrow to see if that reveals anything. Any suggestion as to what channels to use in HP Tuners Scanner?
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Thread Starter
Teching In
Joined: Sep 2020
Posts: 29
Likes: 2
From: Michigan
Thread Starter
Teching In
Joined: Sep 2020
Posts: 29
Likes: 2
From: Michigan
Since rectifying that, I am still not happy with how lazy the shifts are from fear to gear despite moving shift points and pressures. I am about to install the Transgo shift kit.
Staging Lane
Joined: Feb 2017
Posts: 85
Likes: 9
From: Hamilton Ohio