Re: E36 M42 Diff Gear Swap

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Re: E36 M42 Diff Gear Swap

R. Mark Clayton

26 Aug 2007 11:47

> 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

Jack

25 Aug 2007 22:34

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

hsg@h-gee.co.uk

25 Aug 2007 13:48

>> 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

Signature

I 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

John Burns

25 Aug 2007 10:43

> 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.

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Brewer	24 Aug 2007 00:18
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

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