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Old 09-25-2017
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Mike Hohnstein Mike Hohnstein is offline
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Join Date: Jan 2008
Location: NW Milwaukee Metro Area
Posts: 4,512

My coach is geared for 106 @ 2800 in 6th .65 od.
87/89/sp w/ZF are geared @ 82 in 5th that's .8 I believe.
That being said the FC drive shaft is too long and complex to safely exceed 80 by much, been 90 a time or two but the drive shaft thrum gets right scary.
75 is a good cruising speed, and it's the speed limit on much of my WI to ID commute that takes 3 days.
Doing a few more calcs: the sealed bearings we used to repair my Thelma type retarder have a speed limit of 3500, have to hit 135 in 6th to over speed them. Probably not an issue but shaft balance and angles are critical.
Mike Hohnstein
FMCA 97824
Germantown, WI/Myrtle ID

Last edited by Mike Hohnstein; 09-25-2017 at 01:40 AM.
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