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Discussion Starter · #1 ·
According to the bmw part lists I have rear diff no. 3310 7602986.

But I also find here and there on the web this one: 3310 7552529. Same e70, same ratio (3.91) same year and model and engine etc. But even at the bmw dealer they cannot tell me about that last part number.

I looked at my installed diff with inspection mirrors and lights, but cannot find a part number on it.

Main question is; are they interchangeable?

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Nuclear engineer
02/2012 X5 35d M57Y CPO 105K miles NOKIAN WR G3 20K miles
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RealOEM.com has a Part Number applicability search function. 3310 7602986 superseded 33107552530

RealOEM said:
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The specified part 3310 7552529 was not found.
 

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According to the bmw part lists I have rear diff no. 3310 7602986.

But I also find here and there on the web this one: 3310 7552529. Same e70, same ratio (3.91) same year and model and engine etc.
That number only shows up in 6 google hits, all german/Russian sites.

Not sure it is a real BMW number....
 

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Nuclear engineer
02/2012 X5 35d M57Y CPO 105K miles NOKIAN WR G3 20K miles
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I do not recognize a BMW part number in the image.
 

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Here's the pic of the ad, with all numbers.

Sent from my iPhone using Bimmerfest mobile app
And?

Based on the info THEY are providing it is impossible to make a call.

If THEY are willing to guarantee fitment- like 'pay us after it is installed and it works'- Id move on.
 

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Discussion Starter · #7 · (Edited)
I actually found the number on my installed diff: P755252905. That would, as I understand, translate to 33107552529.
It was on the top of the backplate, not on the main housing. So an even more difficult place to see without lifting the vehicle. Reading numbers mirrored and upside down from a claustrophobic position under a car, after sunset, is daunting. Anyway.

The BMW dealer suggested that numbers used in the factory for modules and partly assembled sections (like the entire rear axle assembly) could be different from individual part numbers meant for replacing individual parts.

My e70 is quite an early production. Did BMW maybe change their numbers format in the late 00s ?
 

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I actually found the number on my installed diff: P755252905. That would, as I understand, translate to 33107552529.
Interesting. How does that actually 'translate'?
 

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Discussion Starter · #9 ·
Replace letter with 4 digit part family nr.; 3310 for rear diff. Remove last two digits.

I’ve seen more parts where it works like this. Hence my question about bmw reshuffling numbers. Or maybe it’s just different between continents; USA vs Europe


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My bad. Ive seen that before. Wonder if the two digits that drop are a lot code or revision number?

So it might be
7552529-01
7552529-02
7552529-03

and so on, could all be the same part- just different revs or lots
 

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Nuclear engineer
02/2012 X5 35d M57Y CPO 105K miles NOKIAN WR G3 20K miles
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E70 is built in the US. 05 may be the subassembly number for the final drive casting, but I don***8217;t have a document that would list ...529 01, ...529 02 et seq to compare.
 
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