e30 Limited Slip Differential Swap.pdf - Brian David Bernard

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Pelican Technical Article: BMW E30 3 Series Limited Slip Differential Swaphttp://www.pelicanparts.com/bmw/techarticles/JF-Tech/BMW_E30_3_Series_Limited_Sli...Page 4 of 68/21/2011Followup from the Pelican Staff: Rebuilding differentials is not alwaysstraightforward. I'm not sure about the BMWs, but on the Porsches, youneed some special tools to set the clearances on the ring and pinion. Iwould really just recommend that you do a swap of a completedifferential unit with another. If I understand you correctly, you soundlike you want to swap the internals of an LSD into a regular differential,which I'm not even sure is possible. - Wayne at Pelican PartsTheOneFebruary 19, 2011e30 for lifeFebruary 16, 2011318tiDylanJanuary 19, 2011funcrewDecember 10, 2010driveandtractionDecember 6, 2010backdocMay 21, 2010Comments: I own a 91' 318is. I am not sure if it has an l.s.d, ia friendtold me only one wheel would spin during a burn out. Could this behappening because the diff might need a tune up?Followup from the Pelican Staff: If one wheel is planted firmly on theground, and the other is spinning, then you most likely have an opendifferential, not an LSD. - Wayne at Pelican PartsComments: I have a 86 325 with 2.93 gears and also have 93 325iwith 3.91 and limited slip, want to put 3.25 ratio in the 86 325 withlimited slip can i reuse the limited slip from the 93 325i and do you sellring gears? building an e30 with s50/s52 with SD5Followup from the Pelican Staff: Hmmm, I'm not sure that wouldwork - I think the E30 and E36 diffs are different, but I'll freely admit, Ijust don't know. I'll post this on the forums, and perhaps someone therehas done this swap previously? - Wayne at Pelican PartsComments: I just bought a 3.93 LSD from an e30 and I plan on puttingit into my 318ti. I read on a few forums that I need to get e30 halfshaftsand I also read on other forums that I do not need them. Is itpossible with my stock ti ones? I really do not want to buy e30 ones.Followup from the Pelican Staff: The rear of the 318ti uses a lot ofcomponents recycled from the E30 world. I do believe that you can swapin the E30 differential into the 318ti with a minimal amount of partsreplacement. I think the half-shafts are the same as on the E30 and Ithink it will work well, but I'm not 100% sure. - Wayne at Pelican PartsComments: Thanks for the writeup! A couple issues - One, I don't seewhy the road wheels need to be removed. Two, why didn't you fill thenew diff with oil while it was out of the car?Comments: For 188mm and 168mm LSD clutch plates Check out mywebpage at driveandtraction.blogspot.comComments: Hi All,I have a similar problem as Ant. Bought a 98 M3 auto sedan for my sonlast Dec'09 and has been trying to figure out a vibration problem whenaccelerating. The vibration ocuurs as I pass 25mph and goes away asspeed picks up, no vibration when coasting down or very slowacceleration.The vibration used to occur at 35 mph, then I replaced engine & transmounts, guibo, csb, then the vib is more noticable and shifted down to25 mph. Since then I've had the CV joints rebuilt, changed diff mounts,RTAB, all rear susp bushings with no help. When I support the rear atthe RTA and run the engine, put it in R or D, I hear a crucnhing noise &vibration coming from the diff area. Sounds & feels like something iscatching, grinding, crunching. This is the reason I had the CV jointsrebuilt last time because when I diconnected the drive axles, thecrunching went away. I was so sure the CV jts were bad, but since I'drebuilt the CV jts, put the car back together, it wasn't the CV jts afterall.Is there a better way to diagnose where the problem is coming from? Isit from the diff, drive shaft or auto trans. I also replaced all the fluidsauto trans, diff, engine when I got the car.Followup from the Pelican Staff: Hmm, you've tried all of the toughstuff so far, perhaps the solution is the easy stuff? Try rotating the tirescorner to corner or having the balance checked. Make sure the rotorsare okay and not dragging. Sometimes the system will have a naturalfrequency that is only triggered under load. Driveline components would
Pelican Technical Article: BMW E30 3 Series Limited Slip Differential Swaphttp://www.pelicanparts.com/bmw/techarticles/JF-Tech/BMW_E30_3_Series_Limited_Sli...Page 5 of 68/21/2011theoretically be immune from the actual speed of the vehicle, unlessthey are internal to the transmission. I.E. you would feel the vibrationsat a certain RPM, not a certain speed. Hope this helps... - Wayne atPelican PartsTRUEBLUEApril 12, 2010Comments: HI I AM LOOKING FOR LIMITED SLIP DIFF CLUTCH PLATESFOR BMW LIMITED SLIP DIAMETER OF PLATES ARE 88MM. CAN ANYONEHELP ME.THANKS TREVOR.Mark Comments: I have then same problem as ANT with my 88 325ic -172,000 miles. A couple years ago, a mechanic replaced the carrierbearing non-oem and it solved the problem - for a while - now it's back.I started as a vibration coming from right rear, now it's a thump. Oncethe car is moving, its fine. Also confirmed its not the CV joint, doesn'tsound like a bearing problem. I have decided to replace differential,assuming the carrier bearing is a part of that?April 7, 2010Der Bart84January 29, 2010scorpionJanuary 18, 2010suveNovember 23, 2009JANovember 16, 2009MuleSeptember 30, 2009AntJuly 29, 2009Comments: Thanks for this article! The Pelican articles were already ofgreat help to me. I would like to ask you the following: can I swap myEuro e36 325i differential with a differential with a lower end gear ratioand still keep a correct value on the speedometer? Thanks in advance,BartComments: i have a 93 325is i want to swap the differential can ireplace it with a newer bmw differential or what other recomendetionsyou guys recomend.....Comments: i am looking diff lsd for my e30 89 325i. in what car i canfind 3.92 and 4.10 ratio?Comments: This is an excellent article. First time changing a differentialand it went without a hitch. Thanks.Comments: i'm looking into a diff out of a wrecked M3 for my 325icoupe. i've heard the output shafts need to be swapped. will the onesfrom my current diff fit the M3 diff and if so do they pull out and swapeasily?Followup from the Pelican Staff: Good question, but I don't know theanswer. One thing though - you really don't need an LSD for the street,and in reality it will not help you too much with non-track driving. -Wayne at Pelican PartsComments: Appreciate the insight. Fairly certain it is the diffy. Iexperienced this problem previously in a different vehicle. It feels verysimilar. However, I will verify that the driveshaft couplings are in goodshape.Any comments on the fluid/additive selection?Can you offer any info on the significance of the "M" designation for thismodel? Haven't found anything very specific online. Again, mostappreciated.AntoniFollowup from the Pelican Staff: Yes, try Swepco 201 - all thePorsche guys swear by it for the 915 transmissions. I've had good luckwith it too and I recommend it in my books. We sell it here on the site.-Wayne at Pelican PartsAnt Comments: I purchased a 1989 M535i with LSD suspect the M-designation is a European one, but not sure - 4 speed auto/3.5L "bigsix" B30 for dirt money. It exhibits sort of a thumping sound duringacceleration from a stop, which is transmitted through the car enough tofeel, but is otherwise quiet past 5-10 mph. I switched out the differentialfluid and replaced with Mobil 75W90 synthetic and added 200 ml of aTrans-Ex friction modifier LSD additive total volume = 1.8L; 1.6L fluid +0.2L additive. However, this has not remedied the thumping situation.What would you recommend? I heard Red Line is the diffy fluid ofchoice, but I also heard some conflicting accounts and since I trust Mobil
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e30 Limited Slip Differential Swap.pdf - Brian David Bernard

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