I just bought an HTT 64 71 13 stainless turbo and a set of DDP 4's for my 94 12 valve. It has 4.10 gears, and 35's.. Will this combo be able to tow a trailer in the 5-6,000 pound range without EGT or surging issues? Is this a decent combo for daily driving. I wanted something slightly larger than the 62 65 12 I ran on one of my other 12 valves. It made 569 and was peppy, though it just ran out of air on top.. I'd like a solid 600 with good driveability. Did I make a bad decision?

 

Well your 4:10's should help alot, with the DDP4's you might need to keep the RPM's up and watch the temps but towing that weight It should be doable.

 

Cruising I'm normally at 1800-2000 rpm running 65-70 mph on the interstate..

 

Brad, I run a single 64/71/14 on my truck and have towed with it. It gets pretty toasty getting up to speed but settles out to around 900-1100* This was with a load of around 10,000 lbs on mostly flat ground, not sure how it would do in the mountains. I suspect I could pull hills with over-drive locked out.