Better safe than sorry- - - -that SM 420 is a HEAVY transmission. I'd be more concerned about torque loads on the bellhousing than weight, but either one could break the bellhousing under the wrong operating conditions.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!