[TR] TR3A with J type

[DLylis at aol.com]

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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