2002 gears into E36 LSD?

[Conserv]

How much power are you trying to address with this setup? Or is this simply a less-expensive means to turn your 3.64 open differential into an LSD?

 

Regards,

 

Steve

 

[Mucci]

8 minutes ago, Conserv said:

How much power are you trying to address with this setup? Or is this simply a less-expensive means to turn your 3.64 open differential into an LSD?

 

Regards,

 

Steve

 

 

Both. Planning on 150-180hp depending on which route I end up going. 

[Mucci]

On 3/2/2021 at 6:27 AM, RussTii said:

There is one potential problem with this swap. 2002 diffs used a coarse spline on both the pinion shaft and the output shafts. So you would need to determine if your 2002 flange that attaches the pinion to the driveshaft will fit in place of the e36 unit because the splines make them not interchangeable. While all small case units use the same front seal the actual fitment of the flange may be different. All in all would probably be easier to find a set of gears from any e21/e30/e36 diff that would be interchangeable as they all have the finer spline on both pinion and output shafts.

I’ve been reading through Mike Macartney’s restoration book and came across this today regarding the coarse vs fine splines:

 

 

My car is a ‘75 so it sounds like the splines would be fine / compatible with E36. 

 

Edited March 9, 2021 by Mucci

[Mucci]

The E36 LSD I was able to get is missing one of the output drive flanges. If I'm loading the E36 LSD carrier into the 2002 housing will I be able to use the 2002 output flanges?

 

Talking about this part:

[AceAndrew]

On 3/1/2021 at 4:25 PM, AceAndrew said:

yes,  but not the carrier.

 

^

My intent behind this initial comment was because of the different splines (as others elaborated with more details).  No. 

 

Sorry for the brevity, not much free time right now.

[Mucci]

37 minutes ago, AceAndrew said:

 

^

My intent behind this initial comment was because of the different splines (as others elaborated with more details).  No. 

 

Sorry for the brevity, not much free time right now.

 

Is that true for late model cars after the coarse to fine spline changeover? (see the image from Mike M's book above)

[Jam3422]

The reference to fine/coarse splines that you cite above refers to the transmission output shaft and flange, not the diff output shafts.

[TobyB]

The diff output shaft spline count changes, too.

 

t

 

[Jam3422]

They sure do, but at different times, at least according to the parts manual.  The Macartney reference above is about the tranny output flange.  

[TobyB]

Mmmm.  was thinking in reference to E36 parts vs E30 vs E21 vs 2002, per thread.  

 

t

engineer brain

[Mucci]

23 hours ago, Jam3422 said:

They sure do, but at different times, at least according to the parts manual.  The Macartney reference above is about the tranny output flange.  

 

Do you have any information about those different times? It seems odd that the engineers would choose to change the splines on one end of the driveshaft and not the other. 

Edited March 11, 2021 by Mucci

[Lorin]

7 hours ago, Mucci said:

 

Do you have any information about those different times? It seems odd that the engineers would choose to change the splines on one end of the driveshaft and not the other. 

The splines aren’t on the driveshaft, they are on two completely different components made by different suppliers I believe.