i have a 99 ford ranger 3.0 2wd.... stock supesion stock wheels..no mods

having a problem of when i hit about 70mph... the truck begins to vibrate... (not sure if its the tires or not..)

second thing is wen i start braking going over 45mph...it also begins to shake....

i have rotated the tires...and vibration has gone down a lilttle...

rotors?

get your tires balanced.

...and you might have 'em look at your front-end alignment while you're at it.

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2001 Ranger XLT 4.0L SOHC
Silver Frost w/ Dark Graphite interior


Modifications
Summit 3" Body Lift
31x10.50 A/T tires
Explorer overhead console
Explorer auto-dim mirror
Explorer auto-headlights
Aux1 & Aux2 inputs on factory AM/FM/CD/Cassette
Door-dinger silencer button
Seamless retractable roof and passenger-side ejection seat with steering wheel mounted controls and safety interlock

Tires need balance. Also have them checked them for belts seperating.

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2003 Ranger FX4 level II. 3" BL, 33x12.50 Goodyear Dura Tracs, Custome front and rear bumpers with winch hookups, bed mount full size spare, Electric fan, and of course a glasspack.

i balanced the tires today..... wen i hit 70 it doesnt vibrate

but still vibrates at braking ...

all be working on it all weekend... thanks guys...

check
rotors
brakes
its alignment

the rotors are probably warped? that would be my first guess

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just my opinion.....

1998 ranger extended cab, 2wd, 4.0 ohv, 5 speed, sony xploid 52 4 way watt radio, 2 pair of pioneer 240 watt speakers, air horn, Cobra 29 LX LCD CB radio pushing 100 watts, k&n air filter, 15 inch exploder wheels, dual exhaust with 4 inch stainless tips, 2 10 inch subs with a 300 watt amp just for the hell of it!