2007 heritage softail when at 45 or higher mph and roll off gas the bike begins to shake violently side to side like when ur to close to a tractor trailer any help would be greatly appreciative

 

Check tire pressure.
Lift the bike and spin the tires looking for a bent rim

 

Have the steering neck fall away checked and the correct tightness on the bearings. This is a common problem on softtails.

 

Probably a couple of things at once. When you decel , weight is transferd forward and load is heavier on front wheel. Tire, rim may start it, and any play in the neck bearings will really get it going with the lateral shifting of the forks.
Ron

 

i had a bad wheel bearing

 

+1 This is my guess.

 

Don't forget to check for loose spokes, if you have them.

 

I have a similar problem with a 2004 softail; I can reproduce the wobble by bringing the speed up to 43 miles per hour. At this point if you are attentive you will barely notice a slight wobble as long as you have a pretty good grip on both bars. If you are in a mild turn youmay notivce a little bit more. Now comes the fun partif you lighten your grip so hand are more like resting on the grips the font end star a little shimmy,if you stay your course the vibes turn to a noticible wobble. by ths time the wobble has started pass to the rest of the bike.If you are really into roller coasters you can bring this to a pretty inence level of fear. I have checked the tire presure,cheked the spoke,rigged a guage to check run out buth tires and even made sure there was no weight imbalence. Anyone else got a similar problem that actually got fixed!

 

Same problem here before...+1 was the bearing

 

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