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      03-11-2013, 05:26 PM   #1
sadar
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E46 M3 gearbox into a Z4M

Has anyone tried this swap seeing that the Z4M gearbox is so troublesome on the 2nd gear - gearshifts ?
Will it even work ?
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      03-11-2013, 05:39 PM   #2
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Won't fit into the tunnel
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      03-11-2013, 06:00 PM   #3
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Yeah otherwise we would've had them already

You can reduce 2nd gear grind by any or all of the following ways:
1) upgrade the transmission mount bushings
2) install a short shift kit such as AutoSolutions
3) learn to shift correctly

For #3, I don't mean it in a derogatory way, but rather a serious tone. It has been discussed that for our transmissions, pulling straight down into 2nd is not the correct way to shift. Instead, put more force towards the left while pulling down. Try to keep your shift action short, precise, and crisp. No right-hand jerks
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      03-11-2013, 07:04 PM   #4
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E46 M3 have similar problem with 1>2 shift. What works for me is don't force it into second. Give it a little pause help smooth out the shift. Also VibraTechnic engine mount along with others mention help a bunch.
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      03-11-2013, 07:23 PM   #5
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The reason we got a different gearbox than the e46 one is because that one didn't fit. I wouldn't expect you to be able to fit it for a reasonable cost if BMW gave up on the idea.

The only real thing that helps the grinding so far is the vibra technics engine mounts.

I'm not convinced stiffer transmission mounts help that much, but I don't have them installed so I cannot say for certain.

I don't think SSK helps either, I do have that installed (and it's worth every penny, just not for fixing grind).

I'm hoping that vibra-technics makes us a transmission brace. That + engine mounts has a real possibility of fixing the grind (or at least making it so you have to slam the transmission into second to have a problem). Read the thread I linked for more info.

Other than that, search the forum. This topic has been covered 5 million times. The current best answer is what Rob says above: learn how to do a heartbeat pause between 1st and 2nd.
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      03-11-2013, 07:53 PM   #6
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Here's another vote for the Vibra-Technics engine mounts. Not only does the car shift sooo much smoother, but when you hit the gas the car just goes. They are worth the cost and are the best mod I've done to the car (and I have the AS SSK).
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      03-12-2013, 07:29 AM   #7
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Quote:
Originally Posted by bignosejim View Post
Here's another vote for the Vibra-Technics engine mounts. Not only does the car shift sooo much smoother, but when you hit the gas the car just goes. They are worth the cost and are the best mod I've done to the car (and I have the AS SSK).
seriously agree!!!! Theyve made a huge difference to my car!! HUGE!!
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      03-12-2013, 08:31 AM   #8
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I've changed to stiffer transmission mounts , but still have gear change issues.
I must try these engine mounts.
But what is actually the problem ? can the gearbox be modified (by opening it up) to stop this behavior ?
The denial and popping out of gear, from 3rd down to 2nd really grates my sack.
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      03-12-2013, 01:48 PM   #9
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Quote:
Originally Posted by sadar View Post
I've changed to stiffer transmission mounts , but still have gear change issues.
I must try these engine mounts.
But what is actually the problem ? can the gearbox be modified (by opening it up) to stop this behavior ?
The denial and popping out of gear, from 3rd down to 2nd really grates my sack.
More than likely it's the amount of rotation between gear box / engine under acceleration or hard cornering. Only way to make sure though is to wait for vibra to make us a brace. If that still doesn't solve it, it means it's an issue with the gearbox itself.

The 3->2 denial AFAIK is fixed with stiffer mounts + engine mounts. It's the 1->2 that's better, but not completely fixed.
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      03-12-2013, 02:05 PM   #10
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It's odd because I only have tranny mounts + the AS ssk and I've never had 1st to 2nd grind nor 3rd to 2nd rejection, even at the track. Maybe you really just have to slow down your shifts and/or gently guide the lever into each shift gate?
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      03-12-2013, 02:12 PM   #11
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IIRC vibra stated that there was not a lot to be gained with a new trany mount.
The multi axis OE design is pretty good.

I'm looking forward to getting my vibra's installed to see just how good they are.
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      03-12-2013, 09:35 PM   #12
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Quote:
Originally Posted by inTgr8r View Post
I'm looking forward to getting my vibra's installed to see just how good they are.

You won't be disappointed!
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