2nd Generation Specific 1986-1992 Discussion

FB LSD in FC?

Old 02-09-2006, 01:33 PM
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I'm sure this has been covered before but I can't find it. Can I take the clutch pack out of a first gen diff and drop it in an S5 N/A diff? If so do I need to use the big or small axle first gen diff?
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Old 02-09-2006, 03:20 PM
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To be honest, I don't think you can..... I've only done work on T2 LSDs, but I know the FB and FC part numbers are totally different. T2 FC and FDs are interchangeable though...



Just curious..but why would you want to do this? I would think the clutch pack out of the FB would have smaller discs...
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Old 02-09-2006, 04:07 PM
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Originally Posted by One320B' post='800526' date='Feb 9 2006, 04:20 PM

Just curious..but why would you want to do this? I would think the clutch pack out of the FB would have smaller discs...


Just because I have so many FB LSD's layin around it would cost me $0 to throw one in the FC. I would just like to know before I waste a day pulling the diff out of my daily driver to find out.



According to Mazdatrix, the clutch discs are interchangable. I know for a fact the ring gear is also interchangable.
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Old 02-09-2006, 04:36 PM
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yep the 84-85 big axel diffs go right in, only difference in the fc is the retarded long pinion
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Old 02-09-2006, 06:24 PM
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what about a t2 dif internals in to a gsl se housing?
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Old 02-10-2006, 08:55 AM
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See, I learn new things everyday too... wouldn't have thought the 84/85 LSDs clutch packs swapped into an FC... I guess only the GSL and GSL-SE FBs have the big axles?
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Old 02-10-2006, 09:15 AM
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Originally Posted by One320B' post='800723' date='Feb 10 2006, 09:55 AM

See, I learn new things everyday too... wouldn't have thought the 84/85 LSDs clutch packs swapped into an FC... I guess only the GSL and GSL-SE FBs have the big axles?


IIRC, all 84-85 FB's had big axles, the earlier years had small axles.



Thanks j9fd3s!
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Old 02-10-2006, 10:07 AM
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Originally Posted by 1979rx7' post='800587' date='Feb 9 2006, 04:24 PM

what about a t2 dif internals in to a gsl se housing?


no, t2 is an 8" ring gear, 1st gen and na have a 7" diff
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