Hey guys, I am thinking about gears in my truck. It is my daily driver, and I am considering the tr220 cam. I am thinking either 3.90 or 4.10... But my question is How bad does your mileage suck after this install??? Does it get extremely bad, the same or get any better???
Thanks in Advance!!!
Brian

P.S. it is a rcsb 4.8l basically stock!!!

 

any more aggressive cam that stock will give you worse gas mileage, just physics really. I'd say, 3.73 gears and a stall that complements the cam well, if you have an auto.

If you have a manual, then 3.90s would be a good choice.

 

don't bother with 3.73's or 3.90's. if your running a stock height tire, go with the 4.10's. i have that cam with 4.10's and i get 20mpg on the hwy. although mine is a 5.3....

 

sorry to steel the thread but bluecajun5.3 what kind of stall you have in your truck with that cam?

 

Cajungoose, you say you get 20 mpg on the highway, how many rpm are you running at say 70mph??? just wondering...

 

i get 23 on the hwy with mine running 75 at about 2400 to 2600 some where in that area lol cam and stall 2500 vig. cam 223 225 564 571 114

 

tci 3k stall

 

+ or - somewhere's around 2400...

 

that's damn good kevin! i think i need an in person tune, hint hint, lol...

 

your truck is 3 inches off the ground, i'm sure that helps out alot!