Hi Jack,
I am just upgrading my TR6 (74 as well) to an O/D. I got an Limo OD together
with a bad gearbox from UK. I just started to disassemble everything and
check the OD.
What do you need:
1. J-Type OD
2. Adapter plate (comes together with the junk gearbox)
3. OD main shaft (shorter than the non OD one, also from the gearbox)
4. Angle drive for the Speedo (bought it separately)
5. 2 switches (located on the gearbox cover plate)
While you have your tranny removed from your car, I recommend to check the
condition of the bearings and seals. A well known problem of the TR gearbox
is the layshaft, which is made of a weak metal. A new one is not expensive
and reduce noise. My one was badly worn after only 70K miles.
I paid 380 USD for a checked OD complete with solenoid, gearbox and angle
drive. The main shaft was in good condition, and I now have a set of
synchros and various gear for later replacements.
I bought my TR6 1991 in Seattle which means that it has the US specs. The
diff has a 3,75 : 1 ratio. " years ago I exchanged the diff against a
rebuild 3,45 : 1 one which reduces my engine revs about 300 to 400 U/min.
There is only a slight difference in acceleration but saves fuel. The OD
will reduce it another 500 U/min., so I can cruise on our motorways at 120
Km/h (75mph) at only 3000 U/min.
Best regards,
Jochen Saal
74 TR6
From: Jack R. Clark <drjclark@mindspring.com>
To: triumphs@autox.team.net <triumphs@autox.team.net>
Date: Montag, 10. August 1998 04:21
Subj: TR6 overdrive
>
>How much does an overdrive reduce rpm when engaged at 3000rpm in 4th gear?
>I am considering converting my 4 speed tranny. The trans and od should just
>bolt on, right. Since I have a '74 TR6, I assume it would require the
>J-type OD. How much of a maintenance problem are they?
>
>Thanks,
>Jack
>
>
>
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