ok well i have been runing nitro on my edge 540 now i am going to go to the dle 20cc for a power house i was wondering if i would need to change my servos out to metal gear servos right now i have 3310 on alerions and elevator and then a metal gear 3305 on rudder

futaba 3010 no 3310

If your existing servos have been working well previously, you won't need to change them.

my question is that the 3010 do not have metal gears they are nylon will they hold up to the gas vibration
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Actually Nylon geared servos do BETTER under vibration because they "give" a bit without damage.

Conversely metal gear servos wear more under vibration.

However even a grossly out of balance system is not likely to cause problems with either, as long as the engine is not in direct contact with a servo rod/horn, etc...

If you are talking about say a throttle servo, things may be a bit different, and you may want to make sure that the throttle servo can "give" a bit to deal with vibration.

To add a little to what OPJose has said. The throttle servo will actually have a little extra dampening from vibration because you need to use nylon pushrods with a gasser, and not metal pushrods. Metal pushrods on the throttle servo on a gasser can cause interference from the ignition system to be transferred back to the radio system which can cause a lose of the plane.

As to your original question, your original servos will do just fine with the new gas engine in the plane.

Ken