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need help with Diff. intercgange

Old 02-26-11, 06:45 PM
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need help with Diff. intercgange

OK, I have a GSL-SE rear axle and was thinking about buying a spare diff. from a S5 GXL, does anybody know if the differential (not including the diff housing and R&P) will fit?
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Old 02-26-11, 06:51 PM
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I forgot to ask, is an S5 GXL Diff. a Torsen or a clutch style locker?
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Old 02-26-11, 07:11 PM
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S5 GXL is open, the S4 GXL is what you are after, it is a clutch style LSD. Only the differential will fit your 1st gen. housing, the 2nd gen pinion gear is longer making the ring and pinion useless for your application.
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Old 02-26-11, 07:18 PM
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So are all S5 GXL's are open diff? the car is an Auto if that makes any differance. I thought the GXL was the top level NA, I mean they bothered to put 4 piston calipers on them but not a LSD?
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Old 02-26-11, 07:53 PM
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Auto or manual, it doesn't matter. I'm not sure why Mazda dropped the LSD in the S5 cars. As far as 2nd gen N/A cars, the only ones to come with LSD were the 86-88 GXL and the 89-90 GTUs. Note, not GTU but GTUs. The GXL diff is a clutch type and the GTUs is a viscous type.
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Old 02-28-11, 09:51 AM
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The 88 GTU also has an LSD. It was basically a revamp of the 86-87 sport, but with a LSD, TII seats, and a fiberglass spoiler instead of the rubber duckbill.
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Old 02-28-11, 05:41 PM
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Yup, from the FC FAQ:

Originally Posted by FC FAQ
Did my 2nd Gen RX-7 come with a Limited Slip Differential?
Only the following USA model 2nd gen RX-7s had a LSD from the factory:
86-88 GXL
87-91 Turbo
88 GTU
89-90 GTUs (however not the 89-90 GTU)
Turbo model diffs are bigger, and don't fit, so they don't count.

You can also use the Torsen LSD from a 1.8L miata. it's the same size as the N/A FC Diffs
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