Parastie

That miata LSD seems rather simple, if it'll fit into my non LSD differential, i might try it!

CRXtoRX7

is all the information on how to set backlash and that shimming in the haynes manual? any tips for when i do this?

tt1320flyer

i don't know it may. Still go to a tranny shop and see what they say.

Tofuball

You need special tools to set the backlash. The shimming takes time and you'll want to re-use your old crush tube till you get it right.

CRXtoRX7

hmm what kind of tools, I don't really have that much money to take it to a shop, and I would like to learn how to work on the differential. What kind of charge would I expect if it took it in to a shop anyways? And since I haven't ever done this before, what is your rough estimate on time it would take to get it done?

-Ben

tt1320flyer

its hard to say you could figure it out im sure its just the mistakes can be costly and irreversable. I don't know what a shop would charge you but my friend had a phantom lsd installed in a acura legend and he was only charged 80$, now this is a different process but go around and get an estimate if you go down with the pumkin in hand they may do it for cheaper because the gears are easily exposed.

Even if you do it yourself at least go and get estimates no harm in that.

Travis

Tofuball

Dude, it costs just under a thousand dollers to properly rebiuld a differential, with new bearings sleaves seals fluids tube and the CLEANING CLEANING CLEANING and the special tools you'll need (or competent repair shop) will charge you a little under $300 in labor just to set the thing up!

tt1320flyer

wow, like i said i don't really know but it never hurts to get an estimate.
Travis

Tofuball

As I said in another (https://www.rx7club.com/showthread.p...threadid=41819) thread on this subject:

Rebiulding the whole differential:
$250-$300 in labor
$120 in parts for the bearings (I got mine from a local bearing shop)
$35 or something like that in seals from MazdaTrix.com(one front, and two side seals)
$250 or around that for the clutch parts from MazdaTrix.com
$11 for the Crush Tube from RacingBeat.com
$7 for the Lock Nut from RacingBeat.com
$21 for 3 bottles of Mobil1 Synthetic gear lube (use your own if you want)

After spending all that $, why not buy a set of 4.3 gears? $~430 new from racing beat I belive. I have an S5 NA open 'chunk' with a 4.1 ratio that has stub shafts and is in fantastic condtion, if anyone wants to buy it $75. And I have a standard carrier with a broken tooth that you can have for free if you just pick it up :-p

Rebiulding just the clutch unit:
4-6 hours of work for the first time you do it (Dont dissasemble anything exept the carrier and count the turns of the side screws and return it where it came from. CLEAN EVERYTHING AND KEEP IT CLEAN.)
$250 or something around that in clutch parts from MazdaTrix.com
$21 for 3 bottles of Mobil1 synthetic gear lube

If you want help on how to do this, you can PM or IM me.

Those labor estimates are for if you already have the diff out of the car, BTW.

PS:
KEEP IT CLEAN. BE CRAZY ABOUT IT. DUST IS EVIL!!! ARGH!

Tofuball

I would also like to add, sometimes if you are rebiulding just the clutch unit, you should replace the side seals (the ones that the half shafts go into) and the side bearings should be replaced while you're in there too.

FC3S-NovaStyle

88 GTU came stock with LSD

CRXtoRX7

im not rebuilding my diff, I have a brand new unit from mazda (s4 clutch type) to put in the s5 NA. Is all that work neccessary if I am putting the whole "chunk" inside?

Parastie

Hmm...i know where another Rx7 is sitting in a junkyard might buy the differential from it and tear it apart and see if i can make it an LSD...if it's not already, not sure.

Tofuball

If you are doing the whole chunk and it doesnt grind or anything, then it will probably be just fine (you might need to replace the side brearings and seals)

CRXtoRX7

so since it is brand new, would shimming and setting the backlash still be neccessary? I will check around for prices on those seals...
Thanks,
Ben