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Car Forum / BMW Cars / August 2007E36 M42 Diff Gear Swap
I need to replace differential gear for 1992 BMW E36 M42 engine as it makes noise. 1. Is that true that the ratio of this stock final drive is 3.45? 2. Will 1996 328 E36 differential gear with 3.91 ratio fit my BMW? 3. If I could swap with this final drive, will this improve the acceleration? Thank guys, Kevin >I need to replace differential gear for 1992 BMW E36 M42 engine as it makes >noise. [quoted text clipped - 8 lines] >Thank guys, >Kevin If it fits then Yes acceleration will be quicker but fuel consumption will also increase - less MPG. Perhaps these numbers might help: 92 - E36 M42 1.8lit. 3.45:1 - 33 10 1 214 845 96 328i 3.07:1 - 33 10 1 214 631 96 328i 2.93:1 - 33 10 1 214 636 96 328i MALAYSIA ONLY - 3.91:1 - 33 10 1 428 387 So if you can get hold of a Malaysian 328i and steal the rear end .....? However, I would imagine they will all fit but it appears the 3.9 wasn't an option in the US or Euroland. Hugh Sir Hugh of Bognor  SignatureI used to be an Egotistical Meglomaniac - but now I'm just perfect! Hugh Gundersen hsg@h-gee.co.uk Bognor Regis, W.Sussex, England, UK On Aug 24, 9:09 am, h...@h-gee.co.uk wrote: > However, I would imagine they will all fit but it appears the 3.9 wasn't an > option in the US or Euroland. I'm not sure if the mounting is different so you might also need the subframe/diff carrier. >On Aug 24, 9:09 am, h...@h-gee.co.uk wrote: > [quoted text clipped - 3 lines] >I'm not sure if the mounting is different so you might also need the >subframe/diff carrier. Parts list pictures look the same but then that's just a drawing although they are usually fairly accurate. Sir Hugh of Bognor SignatureI used to be an Egotistical Meglomaniac - but now I'm just perfect! Hugh Gundersen hsg@h-gee.co.uk Bognor Regis, W.Sussex, England, UK > I need to replace differential gear for 1992 BMW E36 M42 engine as it makes > noise. > > 1. Is that true that the ratio of this stock final drive is 3.45? Yes. 325i was 3.15:1 > 2. Will 1996 328 E36 differential gear with 3.91 ratio fit my BMW? Ar you sure it's 3.91:1? I don't think it is. > 3. If I could swap with this final drive, will this improve the > acceleration? Yes, if it's IS 3.91:1. But at the expense of much higher rpms when cruising at speed and a lower top speed. It's not a good idea. SignatureWho needs a life when you've got Unix? :-) Email: john@unixnerd.demon.co.uk, John G.Burns B.Eng, Bonny Scotland Web : http://www.unixnerd.demon.co.uk - The Ultimate BMW Homepage! Need Sun or HP Unix kit? http://www.unixnerd.demon.co.uk/unix.html www.Strathspey.co.uk - Quality Binoculars at a Sensible price >> I need to replace differential gear for 1992 BMW E36 M42 engine as it makes >> noise. >> >> 1. Is that true that the ratio of this stock final drive is 3.45? > >Yes. 325i was 3.15:1 Wasn't the M42 engine an 1800cc ?????? >> 2. Will 1996 328 E36 differential gear with 3.91 ratio fit my BMW? > >Ar you sure it's 3.91:1? I don't think it is. No it isn't John - apparently the 3.91 was only a Malaysian option??? No doubt one could order it as an option for towing a caravan with the 1800 but I bet nobody did. >> 3. If I could swap with this final drive, will this improve the >> acceleration? > >Yes, if it's IS 3.91:1. But at the expense of much higher rpms when >cruising at speed and a lower top speed. It's not a good idea. Especially at petrol prices as they are today and will be tomorrow and the day after..................... Sir Hugh of Bognor SignatureI used to be an Egotistical Meglomaniac - but now I'm just perfect! Hugh Gundersen hsg@h-gee.co.uk Bognor Regis, W.Sussex, England, UK Yes it does appear from Real OEM that your '92 318i has a 3.45 differential if you have a manual or (4.44 if you have an automatic transmission). Yes the 3.91 differential from a '96 328i automatic will bolt into your car OK and you will probably be pleased with the performance since the e30 318is with the same engine used a 4.10 differential. http://www.realoem.com/bmw/showparts.do?model=CD43&mospid=47501&btnr=33_0370&hg= 33&fg=05 >>> I need to replace differential gear for 1992 BMW E36 M42 engine as it >>> makes [quoted text clipped - 25 lines] > after..................... > Sir Hugh of Bognor > Yes it does appear from Real OEM that your '92 318i has a 3.45 > differential if you have a manual or (4.44 if you have an automatic [quoted text clipped - 3 lines] > differential. > http://www.realoem.com/bmw/showparts.do?model=CD43&mospid=47501&btnr=33_0370&hg= 33&fg=05 He might be please with the acceleration, but I doubt he will be pleased with the reduced top speed, increased fuel consumption, high rev's when cruising and reduced life expectancy of the engine. If the car is auto then he may confuse the engine and gearbox management. >> On Sat, 25 Aug 2007 11:43:52 +0100, John Burns >> <john@unixnerd.demon.co.uk> [quoted text clipped - 29 lines] >> after..................... >> Sir Hugh of Bognor > I need to replace differential gear for 1992 BMW E36 M42 engine as it makes > noise. [quoted text clipped - 8 lines] > Thank guys, > Kevin Kevin, Are you sure you need to do this? My '95 325i has whined under a light load since the day I got it used with ~60k miles. It now has more than twice that and I have done nothing to the rear end except change the gear oil. As to your questions above, I cannot answer the first two questions. But if both 1 and 2 are correct, then the answer to 3 is Yes. Signature-Fred W |
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