The Triumph 2000 / 2500 / 2·5 Register Forum

Hi all, I currently have a bog standard manual 4 speed gearbox in the 2500, and have a chance of picking up an overdrive gearbox. Is it a simple matter of removing the old & bolting up the new, or is it a bit trickier than this?

Hi Simon, from NZ. same bell housing etc.You'll have to wire it up of course but no big job.
There are 4 spacers which fit between the floor pan and the gearbox crossmenber,Try and get them with the gearbox if you can. If not and you can't find any I can give you the demensions ,they could be made fairly easily, The mounting plates which go through the floor with the threaded parts which hold the gearbox up will probably also be too short with the longer spacers. Again ,if you can try and get them with the 'box.
While you've got the 'box out you may want to think about replacing the clutch unless you know it's a good one. The o/d gearbox is b.....y heavy. You don't want to take it out again!!

If you were in the UK I would suggest uprated studs/spacers from CW but probably not cost effective from Australia.

'A' type overderive uses a relay. 'J' type does not though personally I would wire in a relay anyway to take the switching load off the gear lever switch contacts.

Ted

The spacers are only needed if you're fitting a 'J' type overdrive box. An 'A' type uses the same rear mounting system as manual with no overdrive.

As already said, apart from wiring, it's all a nut and bolt job. Heavy though!

Cheers,
Mike.

Hello Simon,

also, do try and get the gear lever with the switch (Mounted in the gear lever knob if you are not aware of that) with the gearbox.

Alec

Alec wrote:gear lever with the switch

Oops, I forgot that bit. Very poor, especially considering I changed the gearlever on the PI only the other day!

Cheers,
Mike.

Thanks for all info, will be very useful when (if) I manage to get the gearbox

...finally, don't forget the speedo cable is longer for the overdrive gearbox ... Andy