The ratings on paper suggest the 60'* have no headroom, but they typically outlast the average 65 by double. Go figure. We have far more problems with 65'* here than 60'*, and all the 60'* are older and have higher miles. Can't argue with those numbers.

Your best options for beefing up and gaining headroom on a 97 is Intense. You have the first year of the 65 in your car.

i have a 65? i thought those didn't come until '98?

I'll bet you my sunroof that you have a 65

Got ramps or a jack? Read the pan. It'* stamped. 97 was the first year for the 65 in Bonnevilles. L36 started in 95 with the 4T60, L67 Series 2 started in 96 with the 4T60 (and handles the power just fine), both engines went to the 65 in 1997 in Bonnevilles.

what are hp and torque specs for each one again? and with a stock tranny, whichever one it is, would it be able to handle the power of a stage 1 cam, headers, cai, free-er flowing exhaust, blah blah blah?

Any mods will shorten the lifetime of a trans. Specs are in Techinfo

If you have a vac line from your throttlebody to your trans then you've got a 4t60 if not then it'* a 65

My favorite transmission shop of all time gives the following advice regarding installing auxillary transmission coolers:

1. ALWAYS install the aux cooler "before" the factory cooler. (-that is hydraulically speaking, if you know what I mean.) So that the oil passes still passes through the factory cooler (in the radiator tank) before returning to the transmission. NOTE: This greatly reduces the possibility of "over-cooling>"
2. NEVER eliminate the factory cooler.

-just passing along info from a VERY experienced shop, with the best reputation of any I have ever known.

That is true, I sell probably about 4 a week. The trannys are actually AX4N Which is is the 3.0 Floor shift, and the AXOD is the Column **** 3.0 and 3.8 *I believe...Can double check at work tommorow*

This is good advice. My cooling goes as follows: Trans aftermarket cooler factory aux cooler radiator trans

Gotta try this again I'm pretty sure that I typed *COLUMN SHIFT* *not COLUMN ***** thought that was kinda wierd...guess I could have forgot the f. Now from what you guys are saying than is that it would be bad to put the auxillary cooler infront of the radiatior and not use that cooler anymore.