overdrive my mk4??

[2009poolesparky]

Ive just got the 4 gears on my 71 , mk4 spit.

how hard would it be, and how expensive would it be to convert it so it has an overdrive too?

Alex

[Clive]

Need:
An overdrive gearbox with overdrive attached (the gearbox mainshaft is different, you cannot just bolt an OD on your box)
mountings, shorter propshaft, few electrical bits/switch, angle drive, speedo cable and some other odds and ends. Best to get a GOOD complete conversion, the small bits and bobs are always expensive. Available secondhand from £300 upwards approx.
Take a good day of time, allow a weekend if unsure.

[2009poolesparky]

just found this on ebay, looks good?????

http://www.ebay.co.uk/itm/Triumph-spitfire-gearbox-/300677394099?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item4601c4eeb3

[thebrookster]

Downside to going for an ebay option is that you have no idea what condition the box is in.

Personally, if I was doing it I would get in touch with the various triumph places and see what kinda prices they will do, I don't know if they knock a bit off if you give them the old box in return? I know it is the more expensive route, however you can then be reasonably certain of getting a decent box that will work, and some form of guarantee, which is what swings it in my favour. Also it may be possible to go through the likes of spitbitz/spitfire graveyard/etc, they may be able to supply something cheaper than recon, but may be able to give you an idea of the condition of the box?

[Freebird]

5285 wrote:

just found this on ebay, looks good?????

http://www.ebay.co.uk/itm/Triumph-spitfire-gearbox-/300677394099?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item4601c4eeb3

Guys

Will that fit a 1500??

[aar0sc]

Yes, swap the prop for a shortened one and the clutch for a coarsely splined one. I've got both ready to go on mine, but I know the overdrive doesn't work (it's missing a rather large lump of itself), so I'm going to:

• Make some money,
• Have it reconned

:)

[Clive]

Ah with that gearbox the 1500 std prop will be the correct length. Will need the mounting hardware etc, and as aaron points out a different clutch plate.

[Freebird]

cliftyhanger wrote:

Ah with that gearbox the 1500 std prop will be the correct length.

Tell me more my friend - I am intrigued.

[aar0sc]

cliftyhanger wrote:

Ah with that gearbox the 1500 std prop will be the correct length. Will need the mounting hardware etc, and as aaron points out a different clutch plate.

Oh will it? Interesting (I've got a three rail overdrive gearbox, plus three three rail non O/D boxes, and of course the knackered single rail in my car). So my Mk3 overdrive prop's a tad useless then?  :B