: TSB 133220 for 96 Fleetwood Brougham - anyone know the details to fix

04-26-07, 08:02 AM
I have a 1996 Fleetwood Brougham.. the TSB 133220 is being exhibited in the car, which is: 2-3 UPSHIFT OR 3-2 DOWNSHIFT CLUNK NOISE 4L60E OR 4L65E ** I need to fix the problem but don't have the data that would correct the issue. Anyone know this tsb? tnx

Old Fleetwood
04-26-07, 04:22 PM
Look it up on Google and go from there.
There is NOTHING not known about the 4L60E down there.
Having one of their Stage II units in my 1995 FWB, I can't praise them enough.
Shane Cobb occasionally posts here but is more frequently on the ImpalaSS forums.
He can answer virtually ANY question about the transmission(s).

04-26-07, 08:44 PM
That was a PCM tune fix. See your dealer. Expect around a est time of 1 hour, but in reality will take them about 5-10 min to "fix" as they flash in new PCM program.

Honestly, money better spent on a pro tune like BH tune.

Basically all they did was recal some of the shift tables to keep it from doing it. It isn't really a trans PROBLEM as so much a PCM setting that allows it to upshift right away if the throttle is released. It is a pretty easy fix. I have it setup nicely with 3.42's where no clunk is ever heard/felt.

04-26-07, 10:58 PM
I have that same clunk on my 96 FWB but I dont have a service engine light on. Just tell the dealer about the noise or should I run a diagnostics and see if I get the code TSB 133220? I don't want to pay them for nothing?