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02-21-2020, 09:50 PM | #1 |
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Oem differential broke! Help me which one to get?
Basically my diff is gone. What are my options if i want to upgrade? I dont want to pay 1k on a used diff when i can upgrade. I seen the OG giken for 2k but i heard too many bad things about them. Whats good?
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02-22-2020, 07:31 AM | #4 |
Merlin
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Yeah, this...what the heck happened to your OEM diff?
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02-22-2020, 01:45 PM | #6 |
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bought the car used and the diff was leaking. had the seals replaced right away but the gears grinded down. we think its because of fluid starvation
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02-22-2020, 01:47 PM | #7 | |
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idk.lol |
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02-22-2020, 06:43 PM | #8 |
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I believe Giken has fixed their quality issue. No failures have been reported in recent years. Lots of great reviews here and in other forums. I have one and it really transforms the rear end of the car. It is still a clutch type so may make some noises, but so far zero chattering or grinding with OS250R fluid.
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02-23-2020, 05:38 AM | #10 | |
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I'll be replacing the seal next week, just waiting it to arrive. But this thread scared me. |
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02-23-2020, 06:38 AM | #11 |
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The smart thing would have been to check the diff fluid level and add fluid. A little seepage is not a big deal but a drip drip can be. How oily is the underside of the diff and surrounding area where a drip would get blown onto? Do you have drip stains on your garage floor or driveway?
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02-23-2020, 07:26 AM | #12 |
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The pictures are in thread below:
https://www.m3post.com/forums/showthread.php?t=1685044 Doesn't seem like drip drip, but the diff is oily. There is a light drip stain in garage floor. I'm not at home now. If I was, I would post new pictures. The problem is that here in Brazil it's difficult to find the Castrol diff fluid, the only one available is the Motul 75W140, and I didn't want to mix. But obviously it would be better to have a mixed fluid, than not having any. |
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02-23-2020, 08:35 AM | #13 |
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I don’t think you must use bmw fluid. Any 75W140 will work but if it does not have friction modifier for an LSD you will have to buy that separately and add it. Look for a gear oil with friction modifier, pull the upper plug and pump more in until it starts trickling back out through the hole. Or drain, unbolt the axles from the diff stubs, swing them out of the way but don’t let them hang on their own. Tie them up. Extreme angles are bad for cv joints. You may have to remove the exhaust to get access. Then pop out the stubs are remove the collars and replace the seals. Then refill the diff.
You should be replacing the fluid maybe every 60k miles. I did mine about 40k ago but it’s been about 5 years so I will do it again soon. Same with trans fluid and PS fluid. Brake fluid should be done about every 2 years or 30k. |
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02-23-2020, 08:52 AM | #14 | |
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But yes, I'm willing to use the Motul fluid, just didn't change it all yet because the seal hasn't arrived. |
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02-23-2020, 01:00 PM | #16 | |
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Could you please see my thread and say if it looks like your diff leakage? https://www.m3post.com/forums/showthread.php?t=1685044 Last edited by jvictormp; 02-23-2020 at 01:06 PM.. |
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02-23-2020, 03:40 PM | #17 | |
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02-24-2020, 07:20 AM | #19 |
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I hope that shop is paying for this. They're the ones that ruined it. It was no fluid starvation, it was caused by an incompetent tech.
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