ok. here we go. so, i took my truck to sears yesterday. i got an alignment, rotation, and balance done.
now i've been noticing problems.
1. this has nothing to do with the alignment and everything, but i've been noticing that when i push on the gas, if i floor it, the rpm's will increase, but the speed stays the same. so what is it?? clutch.. pressure plate thingy..
2. if i go 75+ (not that i would ever drive like that bc it's illegal and i always abide by the laws ) the truck will vibrate like crazy.. the whole steering wheel just shakes violently.

any help would be great

 

The vibrating and shaking my be your u joint going out.

 

yes i'm using stock transmission, but there is no play in the pedal at all

 

spark plug gaps?

 

Sounds like your clutch is slipping. Usually shows up in the higher gears first, as you described. Start saving for a clutch and baby it. It'll go a good long while like that if you take it easy.

I don't believe in coincidences. If your vibration problem started after the alignment, rotation, balance job, THEY BOTCHED IT. Most likely a wheel out of balance. Take it back there and ask for a road test. Make sure they know it started AFTER their work.

If it's BEEN vibrating, then your alignment, balance, rotation is a data point toward your diagnosis. I would suspect drive shaft u joints, maybe a dented rim, warped brake rotor, etc.