Thread: FC101 - Woods DC Front Driveshaft

Originally Posted by Sitec

Pos didn't make myself clear.. With a 101 diff ratio of 5.9:1 (nearly 6 revs of the prop to one of the wheel) as oppose to the Range Rover diff at 3.54:1 (3.5 revs of the prop to 1 rev of the wheel, with the original 101 gearing and the right foot buried to the floor (as it always was with mine!), that poor CV would have been doing nearly 6 times the speed....

I understood exactly what you meant.

At speed for speed the tyres on a 101 are only turning 80% of the speed of the Range Rover tyres, although my mental arithmetic had several input errors (didn't know the 101 ratio for one), correcting them for the actual diff ratio in the 101 at 5.9:1 the CV prop shaft would still only be turning 4.7 times the Range Rover CVs on the halfshafts.

If you were running 4.7:1 diffs my calc was almost spot on.

BTW: The 3.54:1 diff ratio on the RRc plays no part in the calculation because the CVs turn the same RPM as the wheels.

The other factor is that a RRc is more than capable of running all day at 140KPH. (That was my standard speed between Sydney and Melbourne back in the 1980's.)

When you consider the RRc CVs at that speed (1.01K RPM) and the probable V-Max (110 KPH) of the 101 on standard diffs the 101 prop shaft is turning 3.68K RPM (2.92K RPM on 4.7:1 diffs)

Still very fast, but possible on the correct CV with appropriate lubrication.

Fair enough. Still fff fast in my opinion! Guess usin old CV's and home made props I was never game enough to really go for it as I've had props part company with vehicles before!!!

Yes very fast indeed, but if an appropriate CV can be found its worthy of a trial.

101 landrover factory diff ratio is 5.57 to one.