switching trans to low side when slowing down harmful?

I amended my post before seeing you post this. We'll settle out of court on a technicality, while I fine tune my reading comprehension.

 

Agreed!!!!!!

 

ethan,
As stated earlier, press (or lift) the selector BEFORE you ever take it out of any gear. Doing it while in neutral is bad for the trans.

 

Not sure about Rockwell, specifically (although I expect them to be the same), but Eaton says don't do it.

 

Ok so to clear this up. I dont care what a manual says. The reason for them stating not to change ranges when in neutral is so that some dummy does not change at too high of speed. It makes no difference to the synchro when it is shifted, just the rpms. Not rpms of the engine, speed of the drive shaft. The best way to destroy the range synchro is to down range too early before you are slow enough. An example is monkey in truck is lazy and finds it easier to pop it into neutral let out on the clutch and burn brakes till the stop. This only becomes a transmission problem when he flips to the low side doing 40MPH. The range synchro is only made to mesh at 20 or less. Thats it, thats all, I have rebuilt them, not that much else going on.

 

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correct,...flipping the range switch while moving fast can spin the synchro up 20,000+RPM and destroy it. If you listen closely, even at 20 mph, flipping the switch in neutral, you can hear it spin up dangerously high.

 

And this is why Super 10's got a bad rap. Guys would kick 'em to neutral at too high of speed, and as soon as the gear shift left the far right gate, it would range shift down. The synchro pack would spit the pins and you'd be stuck in high range. OOPS!

 

But......... say I was coming up to a stop light going 100 miles an hour,can I slam it into low gear to stop in time ?............. just curious.