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I think I need a new diff....

Posted: Mon 06 Aug, 2018 7:29 pm
by babington
The differential in my 1990 420 SE is starting to make quite a bit of a whining noise. It gradually builds in volume with speed, it seems to go quiet on a trailing throttle and grumbles when slowing/coming to a stop.

As far as I know it is not an LSD and has not been changed or repaired in 300,000 km.

What is the going price for a good used one? Alternatively, has anyone had one of these refurbished, can they be refurbished/repaired, is it economical to do so?

Does anyone in Western Australia have a good used diff they no longer need?

I am in Perth.

Thanks

Re: I think I need a new diff....

Posted: Mon 06 Aug, 2018 8:14 pm
by Dean 560 SEC
I may know someone with a spare in a 420 SEL that he's parting out in Perth - Ive just sent him a text.

Text me on 0451 059 901 and i'll send you his details when he gets back to me.

Dean

Re: I think I need a new diff....

Posted: Tue 07 Aug, 2018 7:41 am
by John Green
If the car is a "keeper", I would suggest getting the diff rebuilt, New bearings and seals will fix the noises, for the rest of your ownership. Should be around $1k plus the R&R. A used diff is exactly that, a part that is the same age as the one that has just failed.

Re: I think I need a new diff....

Posted: Wed 08 Aug, 2018 6:29 pm
by hents99
I’d suggest also repairing current diff.
New bearings (4 pcs) price could be 100-150 dollars... oem parts are usually 4x more expensive. Remove bearings and buy new ones with same bearing numbers from hardware shop.

Re: I think I need a new diff....

Posted: Wed 08 Aug, 2018 6:58 pm
by Lance
Check the oil first you might find that the noise is caused by low oil level. If it is not low then just change it, the noise might go away. If it is a bit worn and an oil change helps then you might get a few more years out of it.

Re: I think I need a new diff....

Posted: Wed 08 Aug, 2018 7:47 pm
by Dean 560 SEC
My mate got back to me - $300 for the diff, but you need to take the whole 420 SEL(included in price of diff).

Let me know if you want his number.

Re: I think I need a new diff....

Posted: Tue 04 Sep, 2018 7:24 pm
by babington
Thanks Lance,

drained all up a total of maybe (just) 20ml out of the diff, new oil in and no more noise.

Re: I think I need a new diff....

Posted: Tue 04 Sep, 2018 8:12 pm
by Lance
You're welcome, always good to try the simple things first.