My '01 SSEi with about 190,000 miles has pretty hard shifting once I drive around town a lot. It's great when it's cold. I've changed the fluid and filter several times. I've installed the do-it-yourself shift kit with the different lengths of tubing over the valves, nothing seems to help.
My thought is that the unmodified PCM that makes the car run at 200 degrees is the reason for the problem. When I check the transmission fluid, it always has that burned smell no matter how fresh the fluid is.
I'm thinking of installing a transmission fluid cooler and disconnect the lines from the radiator.
Has anyone else tried this?
How did it work?

Thanks,

You mentioned in your other thread that you pull a trailer? How much weight? I strongly suggest a trans cooler, but run it in line after your radiator cooler, not instead of.

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Bye Bye:

RIP sandrock

Typical symptoms of a bad PCS.

Find a scanner that can read it correctly, and you'll probably find a P1811 code.

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Andrew - owner/operator of Bonnevilles Unlimited

2004 Bonneville GXP | 60k | White Gold Tricoat | custom built supercharged 3800 hot rod | garage queen
1997 Corvette | 55k | Silver Metallic | Z06 wheels | Date-night Hauler/Parts runner
2014 Town & Country Limited | Cashmere Pearl | 95k | Family Hauler
2002 Ram 1500 Quad Cab Sport | Black| 260k | Official Bonneville Hauler

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Thanks guys.
I do handy-man work since the company I managed folded a year and a half ago. Not much work out there for a 50 year old guy whose last job was General Manager of a company that went out of business. Anyway, that explains why I am always looking for the cheap way out.
There is a purpose for telling all of this. I occasionally pull a 16' flatbed trailer with a pressure washer or lawn mowing equipment or sometimes I use it to haul building materials. Tongue weight is about 150# and the trailer itself weighs close to a ton. Heavy single axle trailer. My sont totalled my '89 Silverado that I used to use for this stuff. Great truck 350,000 miles on it and never a single problem. Great truck. All three of my sons learned to drive in my truck. And they have all used it for a year or two while they saved to buy their own cars and trucks. The last few years it was getting pretty rough. Replaced the passenger door after one of my boys opened it into traffic when parked on the side of the road and it got hit. Hood and fender replaced after a wreck and the two pieces came off of two different trucks. So, it was a multi-colored monster. Still ran great and the air conditioner worked great!
Now, I'm destroying my Bonneville by using it as a truck and hauling stuff around in it and hauling stuff behind it.
You gotta do the best you can with what you've got!!
Thanks for any help you can give to keep me going for a while.