Fitting U2Q7 LSD unit into M2P4 Gearbox

prelude_h22 · Post by **prelude_h22** » Tue Feb 25, 2014 7:26 pm

Hi guys

Just a quick question.

Would the U2Q7 LSD unit itself fit into a M2P4 gearbox?
Would it be a matter of removing the original M2P4 differential and fitting the U2Q7 LSD in?

I only ask this because I know my M2P4 gearbox is sound, has the same ratios as the U2Q7 and don't want to waste removing it and then fitting a whole U2Q7 gearbox which will most likely require a rebuild or additional work

Thanks guys

106pete · Post by **106pete** » Tue Feb 25, 2014 7:37 pm

Well you have to remove the gearbox from the car to do the diff and I'm pretty sure the atr lsd won't fit a non lsd gearbox? I know rich@ paw said something about the lsd's not being interchangeable and also quaife only list there doffs to fit non lsd gearboxes?

That will require more research as it's only off the top on my head

Post by **Merlin** » Tue Feb 25, 2014 7:46 pm

prelude_h22 wrote:Would the U2Q7 LSD unit itself fit into a M2P4 gearbox?

I don't think you can. But you should be able to put it in an M2A4 or an M2F5. Both are cheap.

106pete · Post by **106pete** » Tue Feb 25, 2014 8:18 pm

I've just been told the atr diff won't fit a m2b4 but will fit others.

Does that mean a m2b4 lsd won't fit other non lsd boxes?

Post by **Donald** » Tue Feb 25, 2014 8:24 pm

106pete wrote:I've just been told the atr diff won't fit a m2b4 but will fit others.

Does that mean a m2b4 lsd won't fit other non lsd boxes?

I don't know through experience/whatever, but if the ATR diff fits all but the M2B4, then it seems logical that the M2B4 LSD wont fit any other box.

Post by **Merlin** » Tue Feb 25, 2014 8:28 pm

106pete wrote:Does that mean a m2b4 lsd won't fit other non lsd boxes?

Yup. It wont fit other gearboxes.

When getting an aftermarket diff they all say they cant be used with OEM LSD gearboxes (the viscous type in the M2B4).

106pete · Post by **106pete** » Tue Feb 25, 2014 8:45 pm

That must be what I was thinking of in the first place then

prelude_h22 · Post by **prelude_h22** » Wed Feb 26, 2014 5:36 pm

cheers dudes

prelude_h22 · Post by **prelude_h22** » Fri Feb 28, 2014 7:01 pm

Hi All. clarification from Rich at PAW regarding the fitting of the U2Q7 diff in the M2P4 gearbox

Yes the U2Q7 LSD ill fit directly into your M2P4 gearbox. You can swap your crown wheel over onto it but you will need the speedo drive gear or complete VSS from an ATR also as the drive on the LSD is different.

You will also need to fit new diff bearings.

The ATR diff is a nice well mannered LSD so good for road and occasional track. If you were looking at a more track focused set up then there are other better options out there such as Quaife or Kaaz.

Regards

Rich

Performance Autoworks LLP

Tel: 01285 711733

info@Performance-Autoworks.co.uk

www.Performance-Autoworks.co.uk

prelude_h22 · Post by **prelude_h22** » Fri Feb 28, 2014 7:04 pm

I am thinking of going the mfactory LSD and 4.64 final drive route - but its pricey

I assume the 5.15 final drive isn't ideal?

Is any one using the mfactory LSD? any good?