ok,do you mean the engine needs to slide forward to mesh,or to slide sideways to mesh?
i assume its a hyper 7 as per the signature?
if i recall they have a slide engine mount so the engine can silde forwards but they only fit 1 way on the engine itself or the hole spacing will be too wide to fit the chassis holes.
the only other things to check is
bearings are ok in clutchbell
the center diff has not moved sideways,ie broken screws in chassis or bearings have gone.
if it was once meshed ok then it has to mesh again if nothings changed,so check the above.
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