F series diff

[brett_celicacoupe]

exactly what he said


what diff does the century have? or is it coded like the JZA80s (different)

[1JZ-Rolla]

It is interesting that each time a diff/driveline discussion arises there is rarely any mention of the weight of the vehicle, regardless of what engine conversion has been performed Would it be true to say that a sub 1000kg car with 200rwkw would be much more forgiving with regards to driveline shock-loads than a 1400kg car with the same power?

My experience with the F series (ex MX13 Corona) in a 1000kg car is that they are generally very tough with regards to axles, pinion and crownwheel. After close inspection however, it was quite obvious that the pressed steel crush tube which separates the two pinion bearings had suffered from the shock-load of several hard launches/gearchanges, and had flared somewhat at each end, effectively allowing the pinion to move forward & back under acceleration and engine braking. I would say that this alone would have to be a major contributor to any possible F series failure due to the incorrect loading of the bearings & misalignment of the pinion to crownwheel clearance.

This "problem" is quite easily fixed by having your local diff technician fit a solid spacer, as fitted standard in the hilux & other commercial diffs. This is not a direct fit, some minor machining is required. Larger bearings can also be fitted to the pinion (as good workshops will do to the hilux G series also as an upgrade) further enhancing its ability to be thrashed

In a smaller car (corolla/celica/corona), the more compact housing of the F series is definately a benefit in my mind when trying to get a large exhaust over the axle tubes, or simply clear the floorpan in a lowered car, plus the lighter weight has to be a bonus also.

Cheers
Phil

[Screamn_Sleeka]

Brett_celicacoupe and Norbie: Can the MS112 discs be put on a MX13's live axle?

[joecoolmk2]

Brett_celicacoupe and Norbie: Can the MS112 discs be put on a MX13's live axle?

i don't think so, anyways the ST141 setup bolts on, and would probably be easier to get too. this is what i'm using.

[Screamn_Sleeka]

Yeah, but im after 5x114mm, thats why i want the crown brakes.

Brett and Norbie, any ideas? if the axle are required to complete it they can be shortened.

[brett_celicacoupe]

the studs are in the axles not the 'brakes' so changing the rotors and callipers wont automatically give you 5 stud.

the widths and bearings of the axles are different. i got no idea if the axlesa are different diameters so no idea if shortening would work

options with MX13 -> 5 stud are;
1. spacers/adaptors
2. redrill the axle
3. use crown diff (or ford if your mad)

[SIKTOY]

Im heading out to the wreckers tomorrow to look for my new diff
Thanks to all you guys for the advice it helped out alot

Cheers
Ben
P.S happy australia day

[Robbos_Toyotas]

stock lsds are weak, true trac seems to be stronger though.

Honestly, a F series with an LSD is gonna cost you $700 or so, and a G series might be about 900...for 200 bucks dont you think its money well spent if you decide to go for a bigger power motor later on? I just put a Supra LSD into my hilux diff which has a commodore v6, and it cost me $500 on top of $400 for the diff - cheap as chips.

a fellow here with an ms112 and f series has smashed about 4 centres i think.

Im yet to know what im doing when i put FI on my v8ma61...but im damn sure the f series wont handle a figure around twice what youre thinking.

[brett_celicacoupe]

stock lsds are weak, true trac seems to be stronger though.

Honestly, a F series with an LSD is gonna cost you $700 or so, and a G series might be about 900...for 200 bucks dont you think its money well spent if you decide to go for a bigger power motor later on? I just put a Supra LSD into my hilux diff which has a commodore v6, and it cost me $500 on top of $400 for the diff - cheap as chips.

a fellow here with an ms112 and f series has smashed about 4 centres i think.

Im yet to know what im doing when i put FI on my v8ma61...but im damn sure the f series wont handle a figure around twice what youre thinking.

yeh but an RA40 is considerably lighter than a MA61 with a brick for an engine (V8 )

and im sure he wont drive around with drag tires so itll just break traction well before the diff gets under any load. the grip of the wheels is proportional to the mass of the car. probably another reason why the heavy-ass crown kept breaking them.

1g's arent that torquey

V8 = torque = diff killer


and the weight of the diff is another concern if you want to do more than 400m-straight-line driving

[SIKTOY]

anyone know how wide a 97 hilux diff is???

[brett_celicacoupe]

97 model, it most likely wont be a G series. they switched to a new diff naming scheme somewhere about then.

[SIKTOY]

It looks like a G series would it be 1410 wide

[TheToyman75]

IR should deffinatly be a G series but not sure how wide. I'd expect 1410 or 1430.

MY RN25 diff has 1999 hilux diff gears in it (3.7:1) as purchased new from Toyota so they do interchange but you have to change the tailshaft mounting flange as well as the ring and pinion gear.

[gianttomato]

Live G series rear ends come in 3 widths - 1370, 1410 and 1570mm.

[SIKTOY]

1570 OMFG thats huge