Looking for some good advise here. I have a 2003 Silverado, 8.1 engine and Allison 4 speed automatic trans with 123,000 miles on it and pulling a 9,500lb trailer. Its only getting 7mpg and 35 mph up steep grades. Looking to buy a perf. chip set up and want to know what others experiences are. Bully Dog, Hyperchip, Jet, ????

Buy a diesel, and be happy

quote:

Originally posted by HR3377:
Buy a diesel, and be happy

And lighter

I had the Diablo for the same truck with the 5.3L. It did nothing for power or shift or economy. I would not waste the $400 on a tuner for something with that many miles.

Even with your mileage, you might waant to reach out a fellow named Ed Wright, on Classracer.com. He can reprogrm your ECM, and has done it for quite a few folks, and all praised his work.
I spoke with him about mine, but we both thought my 330,000 miles was too many. It's worth looking into.

Black Bear performance has a lot of good reviews at the Tahoe forum.