A quote from the Buckeye site:
The function of the OD is to change the overall reduction ratio between the
engine and rear wheels. It operates in two modes, the direct dive mode where
there is no change is reduction ratio and the OD engaged mode where overdrive
provides a 25% rpm increase in the output over the input rpm (i.e.
overdriven). This means that for a given engine rpm, the road speed is 25%
greater
when the OD is engaged. Another way of saying this is that when the OD is
engaged, the engine rpm is reduced by 20% for a given road speed. The OD is
operator controlled via an electrical switch on the steering column.
So. . .If I am tooting along in fourth gear at 3000 rpm with a 3.70 diff I
should be going 60 mph +/-. However I have a 4.10 diff which is a 10%
reduction so I am actually going 54 mph. Then. . .I flip on the Jtype OD and
take
it back up to 3000 rpm and I am now going 72 mph. OR. . .I maintain 54 mph
and the rpms drop to 2400. Yes?
BTW my speedo does not work. I do not want to find out how fast I was going
from the local constable.
David Lylis
69 TR6 CC26160L
60 TR3A TS74461LO
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