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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > Rear axle carrier restoration



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      03-10-2020, 10:34 PM   #1
TheBigSwede
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Rear axle carrier restoration

Greetings. I live in SW Ontario with my beloved '09 335d. Have been slowly restoring the suspension front to back over the winter and doing minor engine bay mods. I'm at the rear carrier/sub frame and ready to drop it to install all new bushings and perform corrosion remediation on the surrounding areas before it gets out of hand. The subframe is heavily corroded to the point where blasting, filling, possibly welding and painting would be needed to rehab it. I've started looking for a good quality used carrier instead but the search has been difficult.

My question: Has anybody here swapped 33316783715 for an alternate carrier of similar p/n and had success? RealOEM reports there are only 5 other USA spec E91s that share this p/n with the 335d making the potential pool very small to draw from. $1600 CAD for new is too rich for my blood.

Your insights are appreciated. Thx.
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      03-11-2020, 09:50 AM   #2
BB_cuda
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You should be able to pickup a used a good subframe (you call it carrier) in a salvage yard or eBay. I would carefully research the rear diff bushing’s spot on the potential replacement. The 335d has a different size than an E9XM3 for instance. It may be okay to use the bushing size that fits the new subframe. For instance, M3 subframe with its slightly smaller bushing for rear diff spot.
Be advised, E9X M3 subframe uses longer and M3 unique aluminum toe links that are arch shaped. Not sure if you want to diverge away from a standard E9X subframe.
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      03-11-2020, 05:13 PM   #3
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I've been doing something similar over the winter with my 30d. Refreshed front with M3 control arms all around and the change is jaw-dropping Naturally I looked into doing the same in the rear. Right now I have decided on the following bits:

1. 4x M3 upper rear control arms (basically the plug&play replacements)

2. 4x M subframe bushings

3. 2 x Bilstein OE springs + 2x Bilstein B6 shocks

4. 2x Rear trailing arms OE from BMW - this is just a piece of sheet metal and my mechanic advised it's not worth replacing them. However, from what I've been reading, it is actually the weakest link in the suspension and is designed to take the brunt of a hit with something like a pothole in the rear. Just for peace of mind, I will replace mine as they are pretty old and I am doing a refresh anyway.

5. 2x Lower Toe Arms OE from BMW - this is what BB_cuda mentioned I believe. The M3 ones do not fit directly and require sport shocks and struts + I'm pretty sure they needed the M3 stabilizer bar and maybe other things. Since I don't want to sacrifice that much ride comfort with my DD, I am opting for just the plug&play M3 parts + HD shocks and the rest OE.

6. Misc bushings and bolts all Lemforder.

You made me think that probably it will be a good idea to clean and spray some sealant on the axle while it's out of the car... What do you plan on using for yours?
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      03-11-2020, 08:15 PM   #4
TheBigSwede
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The inputs are appreciated. I'll continue the hunt for a viable rear subframe replacement. Think i'll visit a bimmer salvage team here in the GTA with my subframe in hand to do side by side comparison.

So far this winter I've done the following.
1. EGR Delete.
2. ATM intercooler with upgraded ATM boost hoses.
3. Swirl flap delete and chemically cleaned intake manifold. Walnut blast was done 10K ago but intake wasn't perfect. New MAP sensor.
4. All new silicone vacuum lines. Thank you Yozh and crew for the great DIYs and vids. Life saver.
5. New BMW engine mounts.
6. Bilstein B4s all around with bushings and misc HW (sport edition).
7. Upper, lower control arms, tie rods, etc. M3 on the front. Stock spec in rear.
8. Wheel bearings all around.
9. Caliper rebuilds all around with new brake hoses.
11. Removed, degreased, electrolysis to de-rust, POR15 metal prep and paint on anything showing corrosion.
12. Coating the rehabbed metal surfaces with RP342 (Cosmoline) the way I wish it was done from factory. Using FluidFilm where i can't spray RP342.

Like many here, the OCD runs strong. Pull one thing, see something else that is not perfect and the next project is planned. Spring is just around the corner so I need to ramp up progress to get the beast back on the road. The rear subframe rehab vs. find a perfect match for the 335d is what's slowing me now.

Last edited by TheBigSwede; 03-11-2020 at 08:28 PM..
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      03-11-2020, 08:36 PM   #5
TheBigSwede
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Quote:
Originally Posted by BB_cuda View Post
Be advised, E9X M3 subframe uses longer and M3 unique aluminum toe links that are arch shaped. Not sure if you want to diverge away from a standard E9X subframe.
Thx BB_cuda. Read this info a while back on another thread I think you spawned. I emptied my cart of M3 rear end components immediately and reloaded with the stock sport spec as I don't want to mess with the camber or struggle with the install. Honestly I'm very content with stock rear suspension performance. You saved me time, money and sweat.
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      03-15-2020, 03:46 PM   #6
ranthum
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All non m3 e90s have the same rear subframe. There's charts out there showing which specific years and combinations had small or large and welded or bolted differentials, but the mounting points are the same. Should be easy to find.
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      03-16-2020, 08:03 PM   #7
TheBigSwede
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It's out! Not as bad as I'd suspected. Fair bit of scale and lots of flaking paint but still solid in the right places. Will either sand blast or wire wheel then paint, press in new bushings and coat innards with FluidFilm. Pic is from my 235K 2009 335d that has been patrolling the winter highways up here until this winter.

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      05-26-2020, 07:33 PM   #8
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Hey There,

So how did your bushings look to you when you looked at them on the subframe? were they cracked and worn? or just worn with too much play in them?

Also, did you replace with BMW parts or aftermarket? Would appreciate which aftermarket parts you used if you did. I have been considering tackling the rear bushings and control arms after I had done my front last year.

Thanks,
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