Gear boxes that "hum"

Some transfer cases are chain drive, I don't see why one of those wouldn't work...

 

Parkland: i have bought a dana 18 and dana 20 to use they are gear driven ,no chain, very strong(divorced now). will gears stand up to constant full tilt use in reverse rotation? in high only ,since in reverse it would be in extreme overdrive 2.25 to 1. cannot get any info .

 

I'm not the expert, but from what I understand, one side of the gears in automotive stuff are designed for much more stress than the other.

So I think it would work, but not nearly as long as if the gears were driven forward.

 

transfercase in reverse

Thanks for replies. since the dana 20 case has the input and rear output are in line( a slide gear enables a neutral or connected condition, but would still be turning in reverse to original design) and the front drive is at right, when the case is turned around the in and out are still inline the front drive gears would be messing in the reverse way ,so that frontdrive would be used to drive the jet pump ,less startup stress. if you call up a dana 20 exploded view you can really see gears. the older dana18 has the front and rear drive outputs to the right and inline so both would be turning in reverse constantly.

 

Straight cut gears produce no end thrust, power is transmitted through the center plane of the gears from shaft to shaft and are more efficient than helix cut gears. Most auto trans that use them only have them in first and or second range only. I'm sure that bearing life would be less with straight cut gears tough.