Tom:
My recommendation is that you leave well enough alone. The only way I
would see my way clear to fit an overdrive to a non-overdrive car is to buy
an entirely new OD gearbox, J-type. I don't recall if all later TR6s had
OD as standard, but I don't think so. It is very easy to fit the OD
switch, by the way... nothing to that. An OD gearbox (the gearbox portion)
has an entirely different mainshaft, though, so adding an OD to a NON-OD
'box would be next to impossible, or at least it would not be very cost
effective. Hope this helps. Also, if you had the J-type OD on your car,
you would have 6 forward speeds, not just 5! The OD operates on 3rd and
4th gears. The earlier A-type operates on 2nd, 3rd and 4th... 7 forward
gears!!
Pete Chadwell
1973 non-OD TR6
>my 1976 TR6 (cf56542, built may 1976) is not fitted with an overdrive
>switch on the column. my question for the group is:
>1. is my transmission different from an overdrive transmission? does it
> have the same gearbox (5 speeds) but just not the switch to use it?
>2. if it is a 5-speed, is there a way to mount an overdrive switch to
> fully utilize the 5th gear?
>3. weren't all tr6's from 76 fitted with overdrive as standard?
>4. the commission number is followed by a "U", which indicates it is
> for the american market.
>5. does anybody else have a tr6 with a later commission number that does
> not have the overdrive, and if so, have you mounted one since?
>6. how can i get a 5th gear with my tranny?
>
> i would appreciate any insights out there.....thanks.
>
>tom 76 TR6
>#cf 56542 U
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