How cost effect is installing a trans cooler on an 03 at 40000 miles? Someone suggested it because they had put one on their 88 Olds.

I personally think it'* beneficial. It gives you a bit more fluid to circulate, keeps things cooler, and is a good idea if you're going to mod the car.

Any suggestions for a rather inexpensive, easy one to put on. The car is not abused; will not be moded. When it'* hot and the motor'* warm, I usually drive in 3rd to keep rpms in trans up to keep pumping fluid through the radiator cooler. I put it in neutral at stoplights for the same reason in hot weather.

But I think a cooler could be good.

Anything in the 10-12 GVWR range will be under $50. That should do fine. Fairly compact as well.

I'm running an 18000 GVWR viscosity/thermo controlled unit, but that'* a bit extreme for your description.

The dealer told me mine came with one but I dont see it....

All of us have a dinky little chamber in the radiator for the trans.

92-95 SSE'* and SSEi'* came with an external Auxiliary cooler. I ditched mine and did a radiator bypass after the trans explosion due to debris clogging all the passages.

I now run ONLY the 18k external unit.

Do you know where I should look for the chamber on my GXP? Should my 95 SSE have one too?

Both cars do.

Follow the trans lines from the bottom of the trans to the radiator. Typically (at least on the 95) on the passenger side of the radiator.

imidazol
Nice topic. I am interested as well with only 25K on my 04 Bonneville.

Does anyone have a mini tutorial with pics for an install?

guys the junkyards are full of stock GM Tranny Coolers....they are cheap and easy to install....just remember to fully flush the cooler before installation