TRNW-2: 4L60E 2-3 Flare Question

[Tony's Autoworks]

Unplugged MAF sensor and transmission shifts are great. No Flare. I
guess the aftermarket part does not meet factory specs. Ordering a AC
Delco unit.

Tony

On Thu, Jun 26, 2025 at 8:34 AM Tony's Autoworks via trnw2
<trnw2 at trnw.net> wrote:
>
> Hello group,
>
> Got a 2001 Chevy Suburban with a 4L60E and it flares on the 2-3 shift.
> It does not happen all the time but will with medium to heavy
> throttle. I installed a unit that I had on the shelf and on my test
> drive I had the 2-3 flare. I cleaned the MAF and thought it had gone
> away but the unit only lasted a week and it came back with no 3rd or
> 4th and the transmission temp light on and the unit was overheating at
> idle. Figured I had a cooler blockage and replaced the radiator and
> rebuilt the original unit that came out of the vehicle and installed
> it. Still getting a 2-3 flare. I replaced the MAF with no change.
> Transmission is not overheating. The only thing that is the same
> between both units is the new torque converter. Could the torque
> converter cause a 2-3 flare? or do I have something else with the
> vehicle causing the issue?
>
> Tony
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