I have a bad vibration on my 94 fxdlonly6 when i am slowing down or at a certain rpm but it is totally fine at a steadypace or when accelerating

does it have the same acceleration at that speed, if it does not accelerate so well it is called a flat spot and will almost certainly need a good mechanic to sort it out
If acceleration remains as good in this range as through the rest of the rev ange add detail and please resubmit

Bad ignition coils will make the truck act like this. Also low fuel pressure.

no year? no engine? GC ,, . (crd 56?)

there are many engines, used, so we cant guess that.... and is totally Germain.
here ill tick off a few, for low power, and there are many simple tests.

1. a tuneup, do the 60,000 mile listed tuneup now. Bam, runs.
2. low compression on any cylinder. or all.
3. bad spark (see tuneup)
4. if 1996 and newer, scan it , in USA scan the ECU/PCM.
5. bad fueling? too little or too much.

this is engine power, we need the year, the cylinder count and displacement. of said engine.
here is a shop manual.. 93-2004 years

Unbalenced wheels..Bad tiresBefore 80 is too slow it will shake and wave and vibrate.After it can stabilise or get worse.Last:bad motor sensors:air intake,valve timing etc. If not ruff acceleration (rpm related vibration) then is the wheels related (unbalanced,bad/defect tires,low air pressure,loose nuts...)A windy weather also shakes u well :)))Cheers.

if your vehicle only vibrates at speeds above a certain point the most likely cause of the issue is a tire balance issue. just make sure it doesn't matter if you accelerating or decelerating the vehicle just vibrates after a certain speed, and if this is the case take it to a tire shop and have them check the balance. shouldn't cost more than like 40 bucks.

You can check for a loose or broken motor mount but you need to consider how the rubber mounts work. The mounts absorb high frequency vibrations. Low frequency vibrations will be felt throughout the machine.

On most Dyna's, the bike vibrates when idling. When accelerating though the gears (and decelerating back down) if the engine rpm's gets below about 2000 rpm's, you'll feel the vibration. Once above this level, the bike smooths out due to the change in frequency of the vibrations. I have owned a '94 FXDWG since new and this is my experience with the bike.

However, if the vibration is very bad, you may need to have it looked at by a technician. You'll have to determine that for yourself.

This sounds normal to me! The engine will read that rpm when accerlerating lightly. It is the stall of the torque convertor. The oil pressure will always be higher when the rpm's are higher, or when the oil is thicker - cold.

Virbration? That is a different story. Oil won't cause that.

The problem is the torque converter solenoid. I had it happen on my 94 Cavalier a few years back and was a cheap fix at the local car mechanic. What happens is the transmission warms up and hits a certain speed where the solenoid engages, but then it sticks and won't disengage until it cools down sufficiently. When it sticks, it causes the car to shake when slowing down and will snub out the engine if you come to a stop.

Im having the same issue I believe. I have a 94\' Chevy 1500 and when i accelerate it will jerk like the gas has cut out but it wont stall. It just jerks and slows me down. It only seems to do it when going up a hill. I feel like it could be the fuel pump or possibly some intake gaskets?

Take it to a mechanic and have them check for a vacuum leak.