"Lets Roll" <rsfccarbomb@aol.com> wrote in message
news:1113241220.976696.5990@l41g2000cwc.googlegrou ps.com...
> Is it true that a transmission cooler must be added to avoid damage to
> the trans while towing?

Yes, if it doesn't have one already.

A friend has been towing a trailer (weight
> approx. 3500lbs) with his 02 Passport and his transmission seems to
> have fried. In stop and go traffic, it'll shake and shudder, taking
> couple of seconds to find the gear. Is this normal for Passports

No. Why would that be normal for any car?

or is
> a major overhaul of the trans required?
>

Don't know, but quite possibly. What does the fluid look and smell like?

WW