Granny gear uses a big sliding gear with straight-cut teeth. It's going to be noisy, no matter what you do. Because of the low reduction ratio, it's also going to develop a lot of heat when it's in use, and it will also wear pretty quickly. It'sa intended to be used for very short distances to get a heavy load moving, then a shift to 2nd. is needed. That's also the reason we never used the 1st. gear shifter position on the high side of a 13-speed Roadranger- - - - -it wore out the gears too fast!
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!