F series diff question

[The Real Roadrunner]

top mounts are located 15mm further out on the RA40, so yes it will fit but it can cause other issues. only found this out when a customer decided to fit one in his ae86.

cheers
linden

[brett_celicacoupe]

yep, no experience myself but a number of people have said they are the same.

a tape measure speaks the truth

[EVOSTi]

i have a celica diff in my sprinter and can confirm the top trailing arm mounts are different. thats why my upper trailing arms are at a ghey angle but i live with it

[Dongaz]

Does anyone have the dimensions on the spacer required to be fitted between the carrier and the crown wheel for the altezza torsen lsd in the f series live axle housing?

[Stefan]

I would assume that the width needed depends on diff ratio - different ratios seem to have different thickness crownwheels... (I couldn't easily have 3.9 gears fitted to my 3.5, for example).

[AE25]

Does anyone have the dimensions on the spacer required to be fitted between the carrier and the crown wheel for the altezza torsen lsd in the f series live axle housing?

shouldn't need one between carrier and crown? ALWAYS keep the crown and pinion gears as a set.
the pinion gear is usually a bigger diameter on a taller ratio (3.5:1 etc) and the crownwheel thinner to compensate. therefor carrier stays central.
In a live axle diff you are able to adjust the position of the carrier with the side bearing adjustment nuts. i'd only imagine you'd try a shim under the crownwheel if you had an IRS housing and it was easier this way rather than changing shims on the side bearings.
if you need to adjust the position of the pinion gear then that requires a different thickness shim on the pinion bearing.
if there's a big change in ratio's then the housing is a different shape to accomodate the bigger pinion gear. some smaller toyota diffs like U, S and T series diffs have a longer stud to mount the head in the taller ratio's like 3.5, 3.7, 3.9

[AE25]

digging up an old thread again...
i've always wandered why the IRS F series lsd's only have the inside clutch working.. the other two are just spacers as none have the spline on the inside. also like a gimmick lsd was sussing out rebuilding a std lsd last week and thought might try see what could do about that. local diff shop reckons he uses an Escort 'english diff' clutch plate which works and said to look for a townace lsd which has em. had a couple cr30 masterace-surf lsd's under the bench so stripped one down and sure enough.. it has the splined clutch plate. look in the epc and wha-la.. confirms that the IRS diff use different plates than the van diff. the difference being the irs has 3 plates, all with the 4 tabs on outside so they spin with the housing. has swirly oil grooves. the Live Axle van diff has two plates with 4 outer tabs, criss-cross oil grooves... the third (center) plate is a round disk with splines on the inside to locate on the spider gear. pics to come therefore live axle diff is BETTER. you should be able to use live axle clutch plates in irs diff. my local toyota having trouble sourcing these new as they don't recognise their own part numbers.. will be ex japan anyway. will be making my own most likely.
another difference between the IRS and live axle is there is oil grooves on the inside of the side gear where the axle fits in. live axle doesn't have this. i'd say this is for oil circulation to the side seal?

[The Real Roadrunner]

The other difference with live vs irs is the circlip grooves that retain the axles.

You can put an IRS centre in a live diff but you can't go the other way around (generally speeking)

[Major Clod]

Due to a bit of confusion in this thread, I would just like to say that an Altezza LSD fits into an MX13 housing.

Providing you use a matching Crownwheel & Pinion, you shouldn't have a problem (Both of mine came from the Altezza)

I also needed bearings 32010X for the carrier, as the open centre bearing ID is too small, and the Altezza bearing is too high.

Test fitting of the axles shows no real clearance issues with the Altezza Torsen either.

[Hen]

Also just adding my experiences to clear up some possible misunderstandings from this thread.

In an MS112 F series diff I have fitted a stock MA61 LSD centre and a Tomei 2way centre meant for an Altezza (admittedly not simultaneously). Both fitted without problems and worked fine. I can't remember whether I needed different bearings or not, but that can be very easily sorted out at the local bearing shop.

Also the MS112 has disc brakes and internal drum handbrakes. They work very well (as well as, if not better than, the Corona disc handbrakes on my other car), but in an AE86 it was a little tricky to connect up the handbrake cables (if interested search, I once started a thread about it).

Hen

[WDE_BDY]

Also the MS112 has disc brakes and internal drum handbrakes. They work very well (as well as, if not better than, the Corona disc handbrakes on my other car), but in an AE86 it was a little tricky to connect up the handbrake cables (if interested search, I once started a thread about it).

Hen

I am currently working on if vented discs and the handbrake setup from a Toyota Estima can be fitted, looks like a much easier way to hook up than the Crown style. Will let you know how I get on.

Callum

[Major Clod]

Does anyone know if the center carriers / third members / snout are interchangeable between F series live axle housings? ie bolt pattern the same, depth and position of the actual center consistent once bolted to the housing? I.e. use the snout from a tarago f series on a housing from an mx13