Swapping stock diff to TII diff.
 

What is involved in swapping them. Anyone do this on there own? Did you have to replace the bearings. Any help would be great. Thanks guys.

if you are getting a new diff you need new bearings. the T2 diff is a bolt in. just make sure you put everything back the exact way it came out!

whats the benefit of using the T2 diff?

it doesn't explode like a torsen

get a KAZZ! (Later if it's a $$ issue) the T2 is better than stock but KAZZ is better than T2.. Either way replace all the bearings and have a pro set the tooth pattern(Shimming) if you don't know how or confident. Shouldn't take more than 1-2 tries to get it correct. Keep shims seperated and labeled..Good luck!!

i can speak for vosko and myself on this one. KAZZ and TII side by side.... to me anyway (maybe i cant speak for both of us) no difference. it *appears* to be a TII unit.
only difference is all the people complaining about the kazz being noisy.

best person to ask about this would be boostn7. ;)

the noise can be ridden with some GM lsd additive. Works well. Never seen the T2 in person. Is it rebuildable? can you turn it into a 2 way locking diff like the KAZZ? What's the cost of a new T2 diff?

Thanks guys!

keith is right!

kaaz and T2 are baiscally the same thing. T2 is rebuildable also. the T2 is not a 2 way diff. MOST DIFFS ARE NOT! i had a re-amemiya 2 way super racing LSD and it was EXPENSIVE! 2 way diffs are over kill unless you to do lots of drifting or road racing. the T2 is great it makes no noise and its just as tough as a Kaaz. i have spoken to kaaz about this they told me " our clutch packs are huge!!!!!" well you can't make a clutch pack any bigger if the diff is the same size so the T2 diff can take just as much abuse as a kaaz. i used kaaz fluid in my T2 diff because i had it. i have only driven one FD with a kaaz. goddamn its loud clunk slam clunk slam!!!

hmmmmmmmm. . . . thats something to think about. ill be running close to the same hp as you have posted there mr. vosko.

guess it should be on my "list" then. haha

paul

well i haven't broken my T2 diff. the idea came from boostn7 he is the man.... i did this and no damage

http://www.vosko.net/media/burnout/fdburnout-2.wmv
(5MB)

Got this from RP saying 86-88 used a 2 way and none were rebuildable??

http://www.rx7.com/cgi-local/2catalog.cgi?cat=2&part=7

The 2nd generation RX-7 came with various differentials depending on model and year. The only models equipped with Limited Slip Differentials (L.S.D.) were the Turbo II, GXL, GTU, and GTUs models. A L.S.D. will help distribute the power to the drive wheel(s) that have traction. This improves cornering and stability by reducing oversteer and allowing you to put down more power as you exit a corner. In the '86-88 L.S.D. equipped models, Mazda used a standard 2-way mechanical L.S.D. and then switched to a viscous-style differential for the '89-91 L.S.D. equipped models. Viscous utilizes wheel speed input more than torque to sense loss in traction and is slightly slower to react which makes it more predictable for your average driver. It also doesn't require any special additives in the gear oil which made maintenance issues easier as well.

If you're looking to improve the handling and balance of your RX-7, an upgraded differential is definitely worth the investment. Luckily, due to the enormous popularity of the 2nd generation RX-7 in road racing, there are quite a few options available. One option, which was used in the Japanese only, limited edition Infini IV model as well as the the 3rd generation RX-7, is the high-tech Torsen Limited Slip Differential. This unit is superior to the earlier, stock viscous and mechanical limited slip differentials in many ways. Quieter operation, better torque transfer, and no additives to add in the gear oil. The only problem with the units are that they are not rebuildable, which makes repairs costly. For spirited street driving and track use though, they have proven themselves time and time again.

it says the TORSEN is not rebuildable not the T2 diff. i'm pretty sure its not a 2 way . it should be a 1.5way.... 2 way diffs are rare!!! i will double check it and find out for sure

Well I don't know crap about diffs and after finding out we can use the TII as an upgrade instead of the KAAZ, I wanted more info and stumbled across that.

I want to do this swap in the future so I guess it's safe to say, just use a 89-91.

I reread about the torsen so I was wrong on that one.

89-91 is not as strong! you don't want that!

Get the s4 clutch lsd. They are rebuildable, if im not mistaken the new clutch pack is only like 300-400$ from mazdatrix.

you can get it even cheaper from malloy mazda i am sure

you can get it even cheaper from malloy mazda i am sure

So which year and model should I get.

87-88 T2

vosko spill all the beans you have on the T2 diff. im scared to put slicks on the car at the drag strip cause of the diff. i would rather spend less on the T2 then the kaaz. both would offer 1 yr warantees so why not choose the cheaper. if vosko cant/hasnt broken a T2 then i dont think it can be:)
kris

kris, if you're running ET streets it's hard to break a diff unless you have TREMENDOUS power. With ET streets it's hard to get wheel hop plus the sidewalls absorbs most of the vibration, I think the first thing that will break is the PPF.

hmmmm.... i just broke my PPF probably from street tires. i did reinfoce it and actually might take if off and give it some more strengthening. im just worried becuase i saw REDLINE_53(sp) break his diff and half shaft while at a drag race. he was getting greedy with the burnout though. come to think of it, he broke it while burning out and not launching. well if ET street are better for my car then i guess its time to use ET streets. low 12's here i come:)
kris

you will snap an axle with et streets

Vosko should know what breaks 1st..
Doesn't Mazdaspeed have a LSD?