am i crazy?

[heavychevy85]

k me and my wife just baught a 2002 gmc yukon and i wanna do a little up grading. i found a great sounding exhaust from cherry bomb direct bolt on cat-back duels for 500 and i wanna put a throttle body spacer wich is around 150 and a fitch fuel catylist wich is 177 and new gears we have 373's and i wanna put 3.08 which my 85 has in it and i get great gas miliage so i wanna do these things to get a great sounding truck and some saving at the pump so dose any one think i'm crazy

[fbhart@wk.net]

did not say how many miles on truck.

I would give it a good AC delco tuneup, replace fluids, belts as required to insure a safe reliable vehicle.

Then drive it like an conservative old man, like me and try to get the best mileage out of it you can as gas will go to about $4.50 per gal.

Best to save your money for gas in my opinion.

Good luck with truck,

[billk]

not crazy...except for the Fitch...snakeoil...if it worked every fleet manager in the country would order them...and they don't

Bill

[heavychevy85]

ok well the truck we got it for 4500 bucks with 273000 on it with a fresh trany rebuild fully loaded leather seats all the bells and whistles i kbb it and its still worth around 10,500 yeah i'm still considering the gears i don't know if i'll tackle that or not but i am deff. putting a mean exhaust on it

[75K30]

depending on tire size, 3.08 gears might just kill everything. Acceleration is going to be poor, the trans will not stay in lock-up, so it will overheat and burn up, and the amount of throttle required to get that thing motivated will eat up all of your mileage.
Your average might actually go down. 3.08 gears might work well on paper if you run on flat land, and dont have to start from a dead stop ever, but in reality, with inclines, stop, and go traffic varying loads, etc. higher ratios (numerically lower) do not necessarilly work to achieve better mileage.

[heavychevy85]

well then answer me this i have a 85 chevy long bed wich came from the factory with a 305 with 3.08 gears was a camper special with the 305 blowing up and replaced with a 350 i still get around 17 mpgs with a well tuned carb and dual exhaust thats on the highway thats pretty good for a truck thats 23 years old and my jasper 700r4 trany has no plroblem towing cars up and down the road i don't run out of power what so ever

[heavychevy85]

oh my tire size on the yukon are 265/75/16 and the stock size of the 85 is 31's

[z07]

Change your exhaust if you like the sound but don't expect any gains there. Sure on a dyno a less restricitve exhaust will let some engines produce higher peak HP and torque. Is this going to be a racing truck though? Are you looking at keeping it at the top of the power band all the time? If your engine spends most of its time under 3,300 RPMs then there is no way the factory exhaust is going to be noticably more restrictive than straight pipes. Where would you guess the most restriction comes from in the stock exhaust? If you were looking for power and you were talking about a comprehensive solution, headers, ported + polished heads, gasket matching to the headers, free flow dual cats or cat eliminators then by all means finish it off with cherry bombs or straight pipes.

[gmctrucks]

75K30 has a real good point. Like others are saying drive like a old man I do. PLEASE guys don't write back and say you are an old man PLEASE.

[72'CaminoKid]

please dont waste your money on the TB spacer