right i have just done an engine change swaped over the clutch and flywheel, bolted the box back on ,linkage all on (not yet filled up with oil. i then got in the car and checked it would go in gear allright a few times and the first few times it did , but now really stiff ( i havent put any oil it it yet but also havent started the engine ) will this loosen back up when i fill it with oil? .., i just dont want to fill it up if ive put the drive shafts in wrong or something? help please