Differential sadness

[IsaiahW]

Im trying to figure out the best route to handle this. Unfortunately after a long few months of some trans work I finally got my brz on the road for some tuning. Right off the bat i got what appears to be a terribly loud bearing noise. Tore the diff apart and the side bearings are fine but haven’t gotten to the pinion bearing yet. I wanna take this opportunity to get a higher gear ratio since im supercharged also the cd009 transmission gears feel short. Who sells good quality ring & pinions with a 3.58 or 3.73 ratio? Ive contacted weir weeks ago with no response and been hunting for a m85 diff from a is300 with no success.


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[Tatsu333]

Sadly, I have no suggestions for you, but you *might* want to re-post this in the "Engine, Exhaust, Transmission" section rather than the classifieds if you're looking for an answer.

[Breadman]

I've been casually looking for a 3.9 or 3.7 FD too and cant find them. Best of luck

[IsaiahW]

Originally Posted by Breadman

I've been casually looking for a 3.9 or 3.7 FD too and cant find them. Best of luck

Its two options purchase a m85(rare manual 3.7) or m98(auto 3.9) is300 used diff but it’s risky because you don’t know what the diff went through. Alternatively hit up weir performance(call him) or nitro gear for gears to rebuild your current diff. Thats the expensive route but you’ll have fresh new bearings, fluid, gears, etc also parts and labor are under warranty. Ebay shipping prices are terrible due to the weight of a used diff so its better to just rebuild instead


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[NoHaveMSG]

Originally Posted by IsaiahW

Ebay shipping prices are terrible due to the weight of a used diff so its better to just rebuild instead


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I have bought two diffs on ebay and both were free shipping. Price was comparable to local pickup on offerup or FB Marketplace.

[IsaiahW]

Originally Posted by NoHaveMSG

I have bought two diffs on ebay and both were free shipping. Price was comparable to local pickup on offerup or FB Marketplace.

Part of it was me being picky looking for the nicest one with low miles i live in va so most of the diffs were coming from cal.


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[DarkPira7e]

The M85s I've found on eBay I've been able to get free shipping for. I shipped a diff before and it was only like $120

[Breadman]

Originally Posted by IsaiahW

Its two options purchase a m85(rare manual 3.7) or m98(auto 3.9) is300 used diff but it’s risky because you don’t know what the diff went through. Alternatively hit up weir performance(call him) or nitro gear for gears to rebuild your current diff. Thats the expensive route but you’ll have fresh new bearings, fluid, gears, etc also parts and labor are under warranty. Ebay shipping prices are terrible due to the weight of a used diff so its better to just rebuild instead


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The last time i found a used one with a lsd i forget which ratio, it was 900$ used. So I will be 100% passing on a more expensive option for the time being. Also did you use a kit for your cd009 swap? It is only a matter of time before i turn my gearbox into spare parts

[IsaiahW]

Originally Posted by Breadman

The last time i found a used one with a lsd i forget which ratio, it was 900$ used. So I will be 100% passing on a more expensive option for the time being. Also did you use a kit for your cd009 swap? It is only a matter of time before i turn my gearbox into spare parts

I used the mazworx favq kit


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