How To: Swapping miata torsen LSD into N/A FC diff housing
Originally posted by Icemark
The gear ratio doesn't change, that is why you remove the old ring and put it on the new diff.
The miata ring and pinion are the wrong lengths and sizes to use in the FC diff. assembly.
The gear ratio doesn't change, that is why you remove the old ring and put it on the new diff.
The miata ring and pinion are the wrong lengths and sizes to use in the FC diff. assembly.
its just a ring gear swap, correct?
Former Moderator. RIP Icemark.
Joined: Apr 2001
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From: Rohnert Park CA
Yes, and no
Its a diff swap keeping the existing FC ring and pinion.
If you changed the ring, (effectively changing the gearing) then you would have to re-space the pinion.
Its a diff swap keeping the existing FC ring and pinion.
If you changed the ring, (effectively changing the gearing) then you would have to re-space the pinion.
Thread Starter
Joined: Oct 2001
Posts: 7,529
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From: Lower Burrell, PA
Originally posted by Icemark
Yes, and no
Its a diff swap keeping the existing FC ring and pinion.
If you changed the ring, (effectively changing the gearing) then you would have to re-space the pinion.
Yes, and no
Its a diff swap keeping the existing FC ring and pinion.
If you changed the ring, (effectively changing the gearing) then you would have to re-space the pinion.
Newbie
Joined: Jan 2003
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From: Tomball, TX
Originally posted by Rxmfn7
Yes, this is true. And I think that setting the pinion depth for a new ring and pinion set is something that is beyond most people's abilities (mine anyway). There are many special tools needed, and you really need to understand what you are doing.
Yes, this is true. And I think that setting the pinion depth for a new ring and pinion set is something that is beyond most people's abilities (mine anyway). There are many special tools needed, and you really need to understand what you are doing.
Thread Starter
Joined: Oct 2001
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From: Lower Burrell, PA
94+ 1.8 Miatas use the torsen LSD. But not all of them, you just need to get lucky I guess 
Seriously though, I have no idea on how to tell if the miata will have the LSD or not. One method Ive heard is that if it is a 5-speed and has cruise control, it will have LSD. Im not sure how true it is, but every one Ive seen with cruise has had LSD.
Seriously though, I have no idea on how to tell if the miata will have the LSD or not. One method Ive heard is that if it is a 5-speed and has cruise control, it will have LSD. Im not sure how true it is, but every one Ive seen with cruise has had LSD.
Last edited by Rxmfn7; Aug 25, 2003 at 06:57 PM.
Thread Starter
Joined: Oct 2001
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From: Lower Burrell, PA
Just a small update for anyone interested. I was having problems with my diff at 1st. One thing, is that on S5 LSDs, the rear end uses un-equal length axle stubs. When using these on a torsen, or clutch unit, the longer stub will cross over and cause the LSD unit to be "fused" together, making it impossable for both wheels to spin at anything other than the same speed. I got a set of S4 axles stubs and it corrected that problem. Another thing, the backlash will need adjusted properly to spec. My gears were whirring when I put the rear end back in, so I needed to drop it again and adjust the backlash. It is a faily simple procedure, although you will need a few special tools (dial indicator and something to turn the things on the side of the bearings. Mazda calls for a differential wrench, but anything you can turn them with will be fine) The procedure to set backlash is explained in chapter 9 of the FSM, pages 9.43-9.45. Hope this helps..
Thread Starter
Joined: Oct 2001
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From: Lower Burrell, PA
Originally posted by Mills
I thought this was an n/a housing-you were using tII axle shafts? Will the shafts from an n/a housing work? Or do you need the tII shafts?
I thought this was an n/a housing-you were using tII axle shafts? Will the shafts from an n/a housing work? Or do you need the tII shafts?
Str8 Waggin
Joined: Apr 2003
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From: Miami,Fl
OK, Guys i read this whole thing and just ended up getting lost in the process!! OK, can i do this on My 91 Vert. Its n/a. Also will that make my non LSD into an LSD?? And in simple tems for us non mechanical guys explain it to me.
Example: "u take the roung thing and put it in the other round thing" thanks hehe
Example: "u take the roung thing and put it in the other round thing" thanks hehe
Thread Starter
Joined: Oct 2001
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From: Lower Burrell, PA
Originally posted by vosko
umm clutch lsd's are much stronger than torsens!!!!
umm clutch lsd's are much stronger than torsens!!!!
Former Moderator. RIP Icemark.
Joined: Apr 2001
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From: Rohnert Park CA
Originally posted by vosko
i could break a torsen in a T2.... never broke a VLSD though
i could break a torsen in a T2.... never broke a VLSD though
Thread Starter
Joined: Oct 2001
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From: Lower Burrell, PA
Originally posted by vosko
i could break a torsen in a T2.... never broke a VLSD though
i could break a torsen in a T2.... never broke a VLSD though
Finally I have LSD
Joined: Jul 2003
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From: Los Angeles
Rxmfn7. Did you adjust the backlash with the diff case out or did you adjust the backlash by removing the rear half of the case? I need to adjust me rear end and i really hate taking the whole thing out. Thanks!
