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1275GT gearbox/diff - changing final drive


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#1 NunoGT

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Posted 17 February 2007 - 04:06 PM

Hi guys.

I´ve been looking at most of the "final drive" topics and couldn´t find an answer for my trouble so I´ll give it a try and made a new post.

I´m rebuilding the good'old 1275cc preA+ from my 1275GT and the next step is the gearbox.

Minispares rebuild kit is on it's way and thought I could lower the FD while I´m at it.

Anyway the question is, since the car has a standard 3.44 FD (so with a 62/18 - crown wheel/pinion tooth) can I install a 61/19 for a 3.211:1 FD in the same housing?

If so, does it require a handfull of mods?

Thanks in advance for your help.

Nuno

#2 icklemini

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Posted 17 February 2007 - 07:56 PM

Anyway the question is, since the car has a standard 3.44 FD (so with a 62/18 - crown wheel/pinion tooth) can I install a 61/19 for a 3.211:1 FD in the same housing?

No problems whatsoever.

Minispares rebuild kit is on it's way and thought I could lower the FD while I´m at it

Had problems with the layshafts, diff pins (not hardened - or at least not as hard as OEM stuff!) and baulkrings in these kits. - You'll prob need other bits too...

TTFN,
Dave

Edited by icklemini, 17 February 2007 - 07:59 PM.


#3 Guess-Works.com

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Posted 17 February 2007 - 10:01 PM

Same as Dave, had some issues with the layshafts a few years back..

Nowadays I only use competition grade layshafts and Moly-diff pins. I've not had any issues with the MS baulks I've used...

If you're rebuilding the box, I would suggest you put a Central oil pickup in there while you're about it...

on the subject of layshafts, if your original one is still in good shape, then re-use it...

#4 NunoGT

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Posted 18 February 2007 - 12:46 AM

Thank you both for your kind information.

There were no problems with the gearbox when the engine was running, though all these years have surely left its mark.
So I thought of buying that Minispares rebuild kit since it´s not that expensive and I need to do everything I can before the engine gets back in the car.

I woun´t be using this car for any type of racing so I guess it will have a easy life.

Nevertheless I appreciate those hints and will be looking for a toughger layshaft (If needed, ok got that) and diff. pin.
Yes, central pick up pipe it´s on its way :(

Thanks again for your trouble.

Regards,
Nuno




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