Medium and Heavy Trucks
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Sorry for delay Allen,
Do you have a gear shift isolator? you would see it just above top of trans and floor board of truck and it looks like this below
If you have one it needs to be rebuilt which includes a new pin and bushings,, a easy fix.
If you don't have one it needs one as this was a common issue and this is Eatons fix.
While checking have in one of those gears and also see if shifter is hitting floor board if it is the stub shaft out top of trans may also need rebuilt if isolator is not bad.
Those gears it rattles in have two different shift forks so a bent fork would not be the cause
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