legacycentral bbs

Helical cut gears run nearly silent and are swell for a street cruising car. On a high HP car, the angle of the helical cut gear faces causes some of the thrust to get directed out sideways, placing strain on everything that is trying to hold the gears in position. For this reason, race cars usually run a "dog box" which has all the synchros thrown out and the gears are just straight cut, with as much gear face surface as possible. A dog box is a lot tougher, but it aint user-friendly and will howl like a banshee in every gear except the one that is straight through. On most 5-speed cars the silent gear would be fourth, as 5th is overdrive. I grew up on a 47 Mercury woodie with a 36 Ford truck transmission and 2-speed Columbia rear-end (8 speeds forward and 2 in reverse). I found double clutching and listening to that transmission howling to be a tremendous pain in the butt. I know I am a lazy old fat man, but I want silent helical cut gears and when I am driving home drunk, and I want to downshift to 4th at 90mph to bomb past some "slow joe", I just want the damn thing to slide into gear without double clutching or matching RPMs. I'm getting old and I just can't double clutch while I'm puking out the window at high speed anymore.


Bill Robinson




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