currently my car has no power adders and is a 1990 1.6 im looking to swap out the diff to a 3.909 diff from a 99+. do they sell new replacements and if so where can i get one?
3.9 gives better top end so i wont be at 4000 at 60 im also upgrading because the 1.6's are known to break easily. all im trying to do it upgrade to a stronger diff because im planning on a turbo kit in the future i guess i should go with an auto diff from a 99+ miata for a 4.10
You can get 4.3 torsens from a 5 speed nb or 4.10 from a na. No automatic miata's came with torsens fyi. Also 3.9 would be suitable if you're making some serious power. Which if this is "in the future" you may have a miserable time driving until then.
i might as well stay with what i have until i get the turbo and do it at the same time so i don't have a slower car fpr no reason. thanks for the help and how much does the swap cost i cant find any full assembly prices just parts
Buying from a miata/mazda specific salvage group you will get bent over on the price. Expect ~1k for a full 1.6 rear end to 4.3 or 3.9 torsen swap (pumpkin, half shafts, and driveshaft). 4.10's go for a bit less and are more common to come by.
Your best bet may be getting one off craigslist or a you-pull-it and hope the seller is not aware of what it is.
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