5 replies to this topic

[preston-7]

Hello

Please excuse my ignorance, yet again.

I'm looking into a straight cut gearbox for my 1380 mini, ive found a company on ebay selling new (or reconditioned) ones for £425, with a 3.7 crownwheel and pinion?! im not really sure what this means? will this fit straight onto my car? can someone help?


Also ive discovered another one, (pictured)  straight_cut.jpg   35.81K   23 downloadsit is described as a 3 synchro? what is the difference between that and a 4 synchro? also does it look in good condition, it looks as though one of the gears isn't lined up correctly on the left?! and how much are they worth??


i hope someone can help me out as i'm a little confused!


Many thanks in advance

Nick

Edited by preston-7, 09 November 2007 - 12:09 PM.

[Ethel]

You need to chat to Guessworks really, he could build you a box for around the same price (might even be one of his on Ebay).

3 synchro gears are older than 4 synchros but I think you can swap the internals over. I think the piccy you posted is of a remote or 'magic wand' box that may be as much of an issue as you'd have to modify the floor pan to fit it as is & that's assuming you have the selector components to match.

The misaligned gear is reverse it's supposed to be like that. There's no way you could judge the condition of a gearbox from just looking at it. It would really need pulling to bits to check the clearances bearings etc.

3.7 is a fairly high ratio diff your car would be pretty revvy - depends on what you intend using it for.

Oh...

'n 3 synchro means no synchro on first so you'd have to double declutch to change into bottom gear when moving.

Edited by Ethel, 09 November 2007 - 12:33 PM.

[dklawson]

Oh...'n 3 synchro means no synchro on first so you'd have to double declutch to change into bottom gear when moving.

Close. It means you DON'T engage first gear unless you're at a complete stop. Double de-clutching to engage first in a car with a 3-synchro box is not very effective and all you achieve is un-needed wear and tear on first gear. 2nd gear is more than adequate for moving forward if you're still rolling at low speed.

[Big_Adam]

Also the box picutred is an old school rod box. Not a remote like later mini's.

[GraemeC]

Adam, you're getting confused again.
Remote change is pre rod change (and before that 'magic wand').

But you're right in that it one of the older systems, as Ethel has said.

[icklemini]

3 synchro gears are older than 4 synchros but I think you can swap the internals over.

nope...

I think the piccy you posted is of a remote or 'magic wand' box that may be as much of an issue as you'd have to modify the floor pan to fit it as is & that's assuming you have the selector components to match.

Yep tis remote/wand change 3-sync gear box...

The misaligned gear is reverse it's supposed to be like that.

nope its not reverse - its 1st gear - the hub (bottom of the pic) slides across to the left to engage with the laygear (top of pic) - this id's it easily as 3 sync - as there is no baulk ring and the teeth of the laygear bang straight into the track of the hub..

ttfn,
Dave