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RX-7 1st Gen Specific (1979-85) RX-7 1979-85 Discussion including performance modifications and technical support sections |
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#1 |
Rotary Fan in Training
Join Date: Jun 2016
Posts: 56
Rep Power: 10 ![]() |
Fb lsd?
Can anyone please point me where I may find and LSD from my FB? Not for racing but spirited street use. Any advice would be greatly appreciated.
Thanks. |
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#2 |
Rotary Fan in Training
Join Date: Jun 2016
Posts: 56
Rep Power: 10 ![]() |
Hang on...you can swap it for a miata diff with a torsen???
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#3 |
Waffles - hmmm good
Join Date: Aug 2008
Location: Huntersville, NC
Posts: 757
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GSLs had LSD in em OEM, so if you can find one of those from a junkyard, your good to go.
May want to rebuild the LSD before plunking it in there.
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1980 GS stockport, Fat Nikki, RB Dual Facetfuel pumps, Holley regulator, RB Street port exhaust, 2GDFIS, MR2 MK I electric fans, 2G strut bar, relayed fans, lights and fuel pump, LEDs Project Fat Nikki Budget 12A rebuild Video setup < $30.00 |
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#4 |
Rotary Fan in Training
Join Date: Jun 2016
Posts: 56
Rep Power: 10 ![]() |
Hi t_g_farrell.
No scrap yards in Manila sad to say. Also Mazda never sold any rx7s over here. I read somewhere that a miata torsen will fit into the diff of an early FB. Anyone here done that? |
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#5 |
Respecognize!
Join Date: Jul 2008
Location: Δx = ħ/2Δp
Posts: 3,190
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Only the 7" miata diff since the rx7 differential is 7". Dont get the smaller one. Also i think it will only accept the 84/85 axle siince those years have larger spline and bigger bearings.
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#6 |
Rotary Fan in Training
Join Date: Jun 2016
Posts: 56
Rep Power: 10 ![]() |
I thought I replied with my thanks to Whizbang already but I don't see it.
Trying again. Thanks Whizbang!!! |
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#7 |
I5's Doritos & dualsports
Join Date: Dec 2014
Location: Pasadena, MD
Posts: 24
Rep Power: 0 ![]() |
did you try google?
ok so gsl's have 3.90 lsd, but after 1983.5, they became large axle through end of production year ('85) gslse (84/85) have a 4.11 lsd, big axle of course Yes Miata pumpkins can be swapped in so can, mazda 80's truck front diff's which are 4.44 So can kia sportage (90's) front diffs, which are 4.77 you can also source custom lsd's, like I just picked up an '81 GSL rear with 4.88 gears in it Just bear in mind your axle to what pumpkin you're putting in it, OR if you swap the whole rear to acquire disc's, that's fine but you also have to swap out the proportional valve up by the master cyl AND WHAT MOST PEOPLE FORGET ABOUT is you'll need different E brake cables for the disc rear So if you find a LSD/Disc rear at the junk yard, make sure you get 1) complete rear with calipers 2) take the proportional valve from the engine bay 3) get those e brake cables probably more than you were looking for but hopefully the next person searching will find this thread and the above info and it'll solve duplicate posts down the road ![]()
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'85 GS frankenstein 13b bridge Gf's '79 LE sa w/85 12a GF's 04 rx8 dyno'd 189whp, meh not bad |
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