In a message dated 8/25/2010 6:44:03 A.M. Eastern Daylight Time,
macartney.john@yahoo.co.uk writes:
As for engagement and dis-engagement, the
'thump' tends to vary with individual
overdrive units. Some engage
'violently', some do it in a more 'slurred'
fashion
John,
The early TR4 A-Type OD gearbox's in my 62 TR3B & 62 TR4 are what we call
"Bangers" They like launch you forward when engaged at full throttle. I
much prefer those as compared to the later A - Type which you refer to as
"Slurred". That is a very good description. My later 68 TR250 and 71TR6
A-Types OD's are "Slurrers". The 68/70 GT6+, 70 Spitfire MK3 & 76 Spitfire
1500 OD's are "Slurrers" as well. On the 70 MK3 I tried to use OD out of 1st
gear whilst autoxing so I wouldn't need to shift but the pause during the
"slurring" seemed like it took up too much time.
Whilst touring the great thing for me with the OD's is to use them in 3rd
gear on gray roads with various elevations where the speed limit is 45 to 50
MPH. I like to go back and forth depending on the load on the engine
using non OD to climb the hills w/o having to shift. I don't do anything but
flip the switch going up or down.
Cheers,
Darrell
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