Dick's right, one of the biggest factors is the transmission. If you have a lightweight transmission, and especially if you don't have any external coolers on it......you might kill it! I've got a 3023 that I tow with my 91 blazer 4.3. But it has a tranny cooler made for a full sized motorhome on it. (But not cuz of the towing capacity, just haven't had much luck with transmissions....lol). Point is tho, be sure to check into that though. It does sound like your t100 could handle it, but definately look into getting a tranny cooler (external) and get one that's rated a bit higher than you need for just your vehicle (IE, to handle the towing). I'm certainly no expert on the subject, but my family was the first ones on this side of the Mississippi (east) to start selling aftermarket automotive radiators, (where the transmission cooler usually is) and trust me, there are different lengths inside the tank of the radiator.....some of them have heavy duty coolers in them, but ANY transmission shop will tell ya to get rid of it, and get an external...........My system is set up running through the regular cooler on a brand new radiator, then goes into an external where it is cooled even further by a 10" x 12" external cooler for a motorhome. The reason? My radiator was bad, and running the ac, the temp kept getting too hot and I ended up with yes, a THIRD transmission in my blazer, thank god for warrenties! (Rad was clogged up somewhat and wasn't cooling it properly with the ac on). The T100's are still fairly new tho and you shouldn't have that problem especially if noone's ever used stop leak in it. All I can say is I can only imagine what would have happened if I had towed a trailmanor last year down to the outter banks last year. (I just got mine, and haven't towed it any real distance yet to know how it tows). But I can tell ya this much......You're t100 if a v-6 is actually a 3.4L and not a 3.0L, you have a 16.75" Trans cooler in it though I can't tell you how many plates it has. On the other hand, on the big boy of em all radiators for a full size suburban it has a 8.5" 5 plate cooler, which is pretty big. On another note, you have a 3 row radiator in it that's 2" thick which is really good. (Yeah, just looked it all up in my books). My guess is your TOC (Transmission Oil Cooler) is about the equivelent.....longer, but not as many plates and the plates are thinner for sure being on a downflow instead of a crossflow radiator (tanks on top and bottom on yours, on the sides on the big boy suburban so can be thicker)...Lol, anyway, I'm rambling on, but seriously consider adding an external cooler....and only include the one on your radiator if it's a new radiator as crud builds up in the radiator transmission coolers that can break loose and clog up stuff....sure, they can flush em good with hot trans fluid....but no guarentee it'll all come out......trust me, I *know* this.......lol But any transmission shop should be able to do a good professional job for around 100 bucks, and 100 bucks is 1400 saved if it saves your transmission from overheating. Something to think about, and hope all of this helps!
Bill
PS, in a lot of cases, a heavyer duty radiator, and/or one with a bigger TOC is available for most vehicles if anyone's interested....especially domestic trucks/vans. Email me at
[email protected] if you're interested, I don't mind looking it up for ya, can give you a WAY better price as I look out for my friends and we buy direct from just about all of the manufacturers. Just be sure to put "radiator" in the subject line so's I don't delete it. I'll know if it's from you guys as I've not posted that info anywhere else. We're in VA, and can ship next day to VA, WV, NC, and parts of TN. Other places depend on how far out depend, but most of the eastern seaboard is only 2 days, (regular UPS, no fancy airmail or anything that costs a bundle)