WHat to Buy

Post by **lewd lude lover** » Sun Apr 05, 2015 3:07 pm

wurlycorner wrote:
If you buy a JDM car with an LSD gerarbox, 5th gear crunch is common. Most people report good results from just changing the gearbox fluid for Amsoil MTF or (I forget what now, but there's another one) with no need for a re-build.

I cant see what being JDM and LSD has to do with the 5th gear crunch.... Please elaborate..

Post by **RattyMcClelland** » Sun Apr 05, 2015 3:14 pm

Yer its just The U2Q7 That dairy milk crunchies.

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Sun Apr 05, 2015 4:48 pm

Err... No?

The M2B4 is only available on JDM models (hence JDM)
Not all JDM models have the M2B4 box, only some (hence me saying if it has LSD)
The M2B4 suffers from 5th gear crunch.

So what are you both saying is wrong with what I've written?

Post by **Donald** » Sun Apr 05, 2015 5:34 pm

I think what they're saying is the 5th gear crunch is something you more often hear of occurring in the U2Q7, or at least it's probably easier to find a U2Q7 for sale, therefore you hear it mentioned more often. Rather than it being a problem significantly more prevalent in the M2B4. Plus it seems to me 5th genners look to the U2Q7 more (as an upgrade from the M2P4), whereas the 4th gen lot seem to have a thing for the M2B4 since it was a factory fitted bit of gear.

wurlycorner wrote:The M2B4 is only available on JDM models (hence JDM)
Not all JDM models have the M2B4 box, only some (hence me saying if it has LSD)
The M2B4 suffers from 5th gear crunch.

But there are of course plenty of UKDMs that have had a transplant.
Considering the above statement, you could say that some UKDM models do have the M2B4.
So what they're getting at here is that really the market makes feck all difference as there are plenty of mishmash cars about.

Your statement would of course be 100% accurate if we lived in a pure world. Luckily we don't!

Post by **RattyMcClelland** » Sun Apr 05, 2015 5:52 pm

wurlycorner wrote:Err... No?

The M2B4 is only available on JDM models (hence JDM)
Not all JDM models have the M2B4 box, only some (hence me saying if it has LSD)
The M2B4 suffers from 5th gear crunch.

So what are you both saying is wrong with what I've written?

Oh....Citroen boy.......nooooo.

You are correct but as Donald says its way more common in atr boxes.

Post by **lewd lude lover** » Sun Apr 05, 2015 6:11 pm

lewd lude lover wrote:
wurlycorner wrote:
If you buy a JDM car with an LSD gerarbox, 5th gear crunch is common.

??????what else but that you consider the JDM LSD to be the one with the problem is someone supposed to read from that sentence? Now, did you miss punctuate it? Was it an error of meaning? Because what that says is that if you buy a JDM with LSD that the 5th gear crunch is a standard issue. It has nothing to do with either of these things is my point.

And I dont know where you get that idea ratty.

5th gear crunch in the lude is caused by the fork selectors. 5th gear and reverse are on the selector. You know when sometimes you go to put it into reverse but it wont go? well that the reverse syncro not slotting home. As we all do, I hope......, you put the clutch back to 0 and the gear knob back and start again...

The problem comes when people dont do this and force it in... this bends the selector fork over time and ends up with a poorly aligned 5th gear syncro. After that its all down hill.

So.. nothing to do with the dif, or the gearbox type but for the fact they ALL share 5th/reverse.

It really depends on how careful the previous owners have been.

This explanation brought to you by Rich at PAW when I asked ages ago..

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Sun Apr 05, 2015 8:40 pm

Ah ok, right, I get what you're saying... Yes, you might find a UKDM car with an M2B4 car that's been fitted after market.
I was talking from 'as built', standard cars because he said he wanted an unmoloested/unmodified example.

I don't know that 4th genners do particularly have a hard on for M2B4's over a U2Q7's, think it's more that there's a lot more M2B4's around in general, they're cheaper and a lot of 4th gens were modified before ATR's started being broken?

The thing I don't get about the selector fork being the problem is... If that's the case, why does changing the fluid to Amsoil MTF generally fix it?

bmwnunkie · Post by **bmwnunkie** » Sun Apr 05, 2015 8:48 pm

In answer to various questions.

I am after a 4WS, 2.2 vetch. I guess this would mean a Gen 4.

I am not looking for it to be a daily driver but I would want it to be good enough ( or potentially good enough ) to look after and keep up to scratch. I am fairly good doing things up from a cosmetic point of view but only moderate when it comes to mechanics.

Budget wise I am not looking at massive money as I am intending to spend more on putting the car back to , as near as possible, showroom condition.. That said there is a limit as to what I would spend..

I look on the various web site mentioned and I guess I will have to be patient as there is nothing that seems tick all the boxes so to speak. That said, where do you look on this site? I cannot see anywhere obvious for classifieds. I assume I am not looking in the right place.

Anyway... many thanks to all those who have replied to my query thus far.

'92 Si VTEC · Post by **jjmartin349571** » Sun Apr 05, 2015 8:59 pm

RE gearbox issues that have been mentioned, I have an M2A4 and that crunches into 5th when driving like a hooligan. I didn't think the issue was specific to LSD boxes?

Post by **Donald** » Sun Apr 05, 2015 9:12 pm

wurlycorner wrote: I don't know that 4th genners do particularly have a hard on for M2B4's over a U2Q7's, think it's more that there's a lot more M2B4's around in general, they're cheaper and a lot of 4th gens were modified before ATR's started being broken?

Cheaper yes. Not more around though, unless you only look on here. On eBay there are plenty of U2Q7s, a quick mobile search gave no results for the M2B4.