Yes.
There is a way to check, but you need to do it after the truck has sat for a few hours (long enough for it to cool off completely). Fire up the truck and let the oil circualte a few seconds, then step on the throttle and rev it up to 1400-1500 RPMs. If the truck stumbles quite a bit and is running rough the timing is likely the culprit. Also during this you may notice quite a bit of white smoke.
Let us know what you find out.