2nd Generation Specific 1986-1992 Discussion

N/A rearends

Old 12-06-2006, 01:04 AM
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Hey yall, im relitively new to autosports and this is my first post on this site or and rotary site for that matter. But i know alittle of what im talkin about so here's my question.



As far as diff strength goes, what is the average the N/A's rear holds out to? I was looking into doing a 302 swap and i was concerned about it toasting before too long. From what ive seen, all (or most) are open diffs which isnt that big of a deal, i wouldnt expect this car to be doing anything over 350-400 whp on spray. I know TurboII rears are chill, and from what ive seen a new diff in those will last to low 10s. But, as far as availability goes, i was wondering if i could get away with the stock diff.



Also, ive seen 8.8 swap kits from granny. I was wondering, are those worth looking into? From what i saw on other forums, they are complete junk but i wanted ur guy's take.
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Old 12-06-2006, 09:40 AM
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the na rear in a 1st gen or miata is good for 11's. fc's dont seem to be as strong though. its gonna break when you dump the clutch with slicks...
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Old 12-06-2006, 09:00 PM
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or when you dump on good street tires.
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Old 12-06-2006, 09:30 PM
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so, its offical, very very bad idea? well, off turboII hunting i guess lol
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Old 12-06-2006, 09:41 PM
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or a granny speed 8.8 solid axle kit.
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Old 12-06-2006, 11:05 PM
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i cant make a na diff last with the stock na 13b rotary, so i seriously doubt you could make it last with a v8. you wont regret using a TII diff, but you will also need the TII tranny, driveshaft, and axleshafts. and why not keep it rotary??
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Old 12-07-2006, 04:39 AM
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Originally Posted by rotaryturtle' post='848248' date='Dec 6 2006, 09:05 PM

i cant make a na diff last with the stock na 13b rotary, so i seriously doubt you could make it last with a v8. you wont regret using a TII diff, but you will also need the TII tranny, driveshaft, and axleshafts. and why not keep it rotary??
Well, if i swaped over those im better off with geting a turboII, which is another real possibility. And in responce to keeping it rotary, that is yet another possibility is all of thise and a much more practicle one if i did buy my car as a turboII, but you gotta understand were im coming from. 351s, t5's, and mustang fuel injection setups and cheap and abundant, power is easy, and this would mostly be a straitline car anyways. But not having to convert the rear suspension type (IRS FTW ) would also be nice. But then again, maybe maintaining a rotary untill i have the money for a road america ready ls1 =D (i live in south wisconsin, and it would be amazing if i could take a trip up to elkart lake one summer) It all depends on my pocketbook, the condition of what i find and how much a highschooler can baby an aging turboII before it gets the blue smoke of death
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Old 12-07-2006, 07:26 PM
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351 FTW!
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