NinJeVarx7

So this whole welded diff is not working for me. I dont like the sliding majority of the time thing since im not an all out drifter. So my first question is, can a Turbo II LSD fit into a N/A housing? Can a Turbo II rear end be placed onto an N/A? what would that take? Whats the risk with buying a used LSD, can it be overhauled? Does anyone know of a site that sells rebuild kits(if they exist). Thanks for your time guys! If you can answer any of those questions thanks, if not you dont have to reply.

Black Knight RX7 FC3S

iTrader: (7)

TII lsd will not fit in a n/a diff, if u want a n/a diff, either aftermarket or get one off a s4gxl. All s5 lsd are viscous, all s4 lsd are clutch. You can get rebuild kit for both turbo and n/a at mazdatrix.com

You will need to rebuild the lsd most definitely if bought used.

Black Knight RX7 FC3S

iTrader: (7)

Forgot to mention that the turbo diff can fit in place of the n/a diff, but u will need a tII trans, driveshaft, and turbo halfshafts.

dwb87

iTrader: (22)

Buy a used S4 N/A LSD and rebuild it.

nofords

iTrader: (9)

Fixed.

You can keep the N/A trans with the T2 diff as you can make the N/A driveshaft work on a turbo pinion flange. Just need to re-index the holes.

Many have done this.

philiptompkins

iTrader: (4)

yup.
has anyone ever rebuilt the s4 rear? know how hard it is?

LoLsmileyFC

iTrader: (37)

i have a s4 clutch type lsd for sale. its from a 88 gtu with only 80k miles never abused

if you want to make it easy for you if you have a s4 n/a open dif just swap in a s4 n/a diff.

Black Knight RX7 FC3S

iTrader: (7)

yea that too.

Mazdatrix also sells a driveshaft that will fit a n/a trans to a turbo diff

Celestial-Fc

1988 Gxl lsd is probably the best to get. surprisingly my lsd still works very well so ive never needed a rebuld for it.

porsche4786

You can use a helical LSD from a miata, that's what I did. Works great. Although I did drop the rear diff out and took it to pineapple racing and they swapped the insides out for me.

RotaryEvolution

iTrader: (30)

it was also brought to my attention that the pinions yokes are interchangable between n/a and turbo as i never paid attention. so the easiest method is to actually swap the pinion yoke to the TII diff which eliminates the need for a special driveshaft.

Poker Player

I didn't know all S5 have LSD in the rear? I have an 89 N/A. How do I tell if it's a LSD?

RotaryEvolution

iTrader: (30)

whoever said that is incorrect. i actually only know for sure that the TIIs were LSD but i have a S5 GXL that is open and the GTU is open, perhaps even the GTUs as well. LSDs were actually more common in the series 4 models.

i could be wrong but if not, the viscous LSDs are junk. as i always peg leg the series 5's into driveways.. perhaps not paying attention the VLSD only locks up at speed, which is just dumb, if those cars did in fact have LSDs, i simply could not tell.

FelixIsGod29X

iTrader: (50)

Including me. I grinded the holes completely outward so its not a hole anymore but a big slit. Ive dumped it plenty of times and its holding up fine.

S4 LSD for the win.

Black Knight RX7 FC3S

iTrader: (7)

All s5 GTUs and turbo S5 has the viscous lsd. They were the only model to come with LSD.
Viscous lsd sucks for putting hard stress on the lsd unit such as drifting which would overheat the fluid, but in auto x or less stressed races on the drivetrain, it performs well enough, not great.

dakota's rx7

iTrader: (9)

so how do you tell what you have i ha 08/87 n/a how do you tell if its open or lsd

Black Knight RX7 FC3S

iTrader: (7)

jack the entire rear of the car up, and spin the tire in one direction, BOTH wheels should turn in the same direction if you have LSD.

dakota's rx7

iTrader: (9)

ok thanks sounds good ill try that when i get off work been wondering for awhile if i have and lsd or not

dakota's rx7

iTrader: (9)

ok i dont have an lsd so looks like im taking it to schoold to weld it up. whats the plus and minus of me doing this. my car is tii swap so i mean im just using this till i blow the rear end i just want a good posi burn out not no one peal squal.

TheAbsence

iTrader: (19)

Don't spread misinformation. All series 4 (86-88) GXL models came with the same clutch type LSDs.

RotaryEvolution

iTrader: (30)

downsides:
looking like an idiot chirping the tires when taking any slightly tight turns
putting a ton of stress on the rear drivetrain breaking and gaining traction CONSTANTLY
broken components
if the welds are not adequate the rear end may lock up completely(hopefully not on the freeway taking a turn with a family driving behind you) think of someone grabbing your e-brake and jamming it up on you and you cannot release it, don't touch the brakes, let the rears gain as much traction as they possibly can albeit it next to none. unless you lose control then the brakes will be helpful.

upside:
no loss of traction in a straight line due to worn LSD units



can you tell i'm not a big proponent to welding diff's?

MMoore4545

iTrader: (7)

Don't forget that the 3rd member from a late first gen "big axle" LSD (1984-85) will swap into the 86-92 Non-Turbo housings as well.

if i recall correctly 84-88 clutch type 7inch diffs even have the same part Mazda part number.
I know that they do for a fact with Kaaz

If you find a first gen parting out you could get lucky for cheap. Rebuilding these things isn't expensive or difficult.

http://mazdatrix.com/g5.htm