the main reason the 200 case runs hot is because helical gears have finer tooth than a 205. a 200 case is stronger than a205, because the 205s gears are more coarse there is less fricton. early model military vehicles wernt desgined to run long distances on a hiway all the time. 5.89 gears 900-16 ntd fine tooth gears in tcase,4000rpm=heat!! before i went to a205 ,i welded fins on the 200. this helped alot but the noise from the case drove me crazy! again fine tooth gears. any way find a205 they are more user friendly. matt