Blown Trans again

This is my second 5 speed I've blown, I finally got smart and got the 330ci Trans, now all I need its the 330ci rear end and CVs, the 325 drive train juat can't handle 330 motor and high compression pistons. To much power, I can't wait to Dyno at school and get my real numbers. Quick question does anyone know of a conversion kit for 330 CV shafts? Or should I just get a whole subframe assembly with diff and everything? Thanks.

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The diff, as well as the axles themselves, should be the same between the 325 and 330.

I thought the 330 came with a 5spd for a while before the six speed.

I was wondering that, too. Based on what I see on RealOEM, it's still a different p/n.

Originally Posted by The Thomas J

I thought the 330 came with a 5spd for a while before the six speed.

It did but its a Zf not a getrag

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Originally Posted by lcoleman

The diff, as well as the axles themselves, should be the same between the 325 and 330.

The 330 has thicker axles and beefer CV joints and the 330 zf trany is stronger


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Real OEM says the 330 and 325 got the same axles. I know the diff is the same, perhaps a different ratio, but otherwise a standard medium case open (blah) diff.

Originally Posted by lcoleman

Real OEM says the 330 and 325 got the same axles. I know the diff is the same, perhaps a different ratio, but otherwise a standard medium case open (blah) diff.

Really that sucks, I guess M3 rear end with subframe
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Got the Trans today

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I will post pics of both showing the difference soon.

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I'm assuming these trans are being put through extraordinary abuse?

Originally Posted by cposk

I'm assuming these trans are being put through extraordinary abuse?

Probably used harder than most, but I doubt the 325 transmission is designed to handle much more than 200 ft*lbs.

Originally Posted by cposk

I'm assuming these trans are being put through extraordinary abuse?

Ya it is, it sees quite a few track days a month. And with way more power and torque over factory it just can't handle it but the Zf can

Originally Posted by WDE46

Probably used harder than most, but I doubt the 325 transmission is designed to handle much more than 200 ft*lbs.

And ya it really isn't that's why second gear always goes out it is really weak

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The 330 definitely has larger axles. WAY larger. The bearings are also WAY bigger. (different trailing arm)

The ZF can handle 320 lbs of torque. don't be doing repeated launches. i doubt your 330 swap had anything to do with blowing transmissions. you might have another problem somewhere or just bad luck.

Just wondering why you wouldn't just buy a 330 for your track days... Sounds like you've put (or are about to put) a lot of time, effort, and money into making a 325 into a 330?

Originally Posted by E46Mango

The 330 definitely has larger axles. WAY larger. The bearings are also WAY bigger. (different trailing arm)

The ZF can handle 320 lbs of torque. don't be doing repeated launches. i doubt your 330 swap had anything to do with blowing transmissions. you might have another problem somewhere or just bad luck.

Ya that's what I thought cause the 330 has the same rear brakes as the M3.
And probably bad luck, and abuse has a play as well. And no Launches just hard Shifts into 2nd it Roasts the Tires when I shift into 2nd

Originally Posted by GSherbs

Just wondering why you wouldn't just buy a 330 for your track days... Sounds like you've put (or are about to put) a lot of time, effort, and money into making a 325 into a 330?

And ya well I've had the car for 3 years now and I'm going to turn it into a dedicated track car soon, and just can't sell this one to one to much money invested already and 2 I love it I have a really good setup on it and it really grips hard, I'm trying to get a 135 for daily or a E46/36 M3



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Currently in the middle of a trany swap, went down to the stealership and got the 5/reverse fix kit and detents for the zf Trans and am now pulling out the old one. One problem the guibo is bigger meaning my drive shaft won't fit, so I think the out put shaft on the getrag has the same splines as the zf and hopefully will allow me to swap out put shafts... Hopefully........ And I just pulled it off and the are the same splines! Sweet! I win this time.... But mostly she wins....

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Here are photos of the differences left is the zf right is the getrag for the first photo the second the ZF is on the right and getrag is on the left, the last photo shows the difference in size off out put shaft the socket its an 18mm as a reference

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Here its the difference is guibo size left is ZF and right its getrag

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