Originally Posted by sqela
I know the 4t60-e is light duty but out of curosity how much can it take horsepower wise and torque wise before something breaks
I e-mailed pontiac a couple years ago and they told me:
"Thank you for contacting the Pontiac Customer Assistance Center. We
appreciate the opportunity to assist determine the maximum torque on your
We have documented the information you provided under file 1-88296206.
Please refer to this file in all communication regarding this matter.
We would also appreciate it if you would provide us with your daytime
and evening telephone number.
First, we would like to advise you that Pontiac does not advise
modifying your vehicle and the number we provide below are to only to be used
as a guide and may not always be applicable under certain conditions.
Maximum engine torque-235 LB-FT
Maximum gearbox torque-final drive 3.06=354 LB-FT
We hope that you will find this information helpful and if you should
need to contact us in the future, simply reply to this message or call
our Pontiac Customer Assistance Center at 1-800-762-2737. Customer
Relationship Managers are available Monday through Friday from 8:00 a.m. to
11:00 p.m., Eastern Time.
Again, thank you for contacting Pontiac.
Customer Relationship Manager
Pontiac Customer Assistance Center"