TRNW-2: 4L60E 2-3 Flare Question

[Steve Everett]

    A gauge would be helpful, to check line rise, as far as replacing the
MAF sensor ,  what did you replace it with ?  one from a parts store?
unless it was a Delphi part, or actual AC Delco ,  chances are it doesn't
work correctly ,  Delphi makes the MAF's for AC Delco,   I've not seen an
aftermarket MAF that worked correctly yet,

   As a quick test you can unplug the MAF and drive it with it unplugged,
if the flare goes away its related to the MAF,  since its two completely
different units I'm betting on it being a MAF problem,  you should also
check the air filter,  I've found most customers seldom ever change them,
I've pulled them out so stopped up I don't understand how the engine ran.

    Steve

On Thu, Jun 26, 2025 at 11:34 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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