9"diff into ma61 conversion

[RT40Corona4AGTE]

go with the 9" mate, stick in there! they may be a bogan diff, but they are strong as for people of the likes of us! ;-)

[thechuckster]

blake: The only common point between the two setups would be the upper mount points for the shocks. No idea if the chassis rails at the rear are the same for RA60 & 65/61 but it's them not the floor that you'd have to swap over as the mount points are attached to the chassis rails not the floor.

Have you thought about stuffing a JZA70/MA70 rear end into this thing (Crambo has done it and the TA64 rally car up here has as well). Room in it for a substantial diff and the axles are quite robust. You'd also have the handling benefit of a proper IRS rear-end.

Two of the mount points on the JZA70/MZ70 subframe line-up with the MA61 chassis and you only need 4 out of the 6 points to attach it.

[JustenGT8]

LOL quite robust Is anyone breaking them? Having seen one survive hell at Dubbo laying down 400rwkw via slicks i'm glad i finally added the last piece to mine.

[thechuckster]

I was thinking about breakages when writing the earlier post. Now that you've upgraded to a 100% JZA70 rear end, I can't recall anyone saying they've munted one.

Is there much difference between the JZA70 & JZA80 rear diffs & axles? RZ was laying down a stupid amount of power with his 2J-powered JZA80 and apart from some suspension stuff, the rear end in his weapon is stock.

With the right tyre & rim combo, I reckon the only fabrication issues will be the rear mount points for the subframe and coil-over-shock upper mounts. Easier than converting a semi-IRS chassis to a 4-link solid axle.

[Toy77]

Heya,

Yeah i remember Matty smashing a jza70 torsion on the start line at the old eastern creek track cos my ute had to tow it home lol... That was in the jza70 supra Phil now owns - it was making around 200rwkw and wasn't running slicks or even ET streets. Mind you i don't believe that one diff with unknown history means they are weak by any means - but it is one i deffinately know broke.

As for RZ 'laying down' power, it makes big power, but does it put it down? 450kw, that doesn't hook up and run 10's - is that testing a diff? if it was running 1.4 60ft on slicks i would say yes..... Again not saying they are weak, but i dont think that is a good example as such - Shanes cressy though is a different story...

And i have seen 9in break without silly power, they are easy to build to a tough level, but Jamie stuffed a set of axles with 300rwkw in his navara early on....

I think you need to decide what you want to do - i don't think there is alot of arguement - the live axle is better for drag racing, the independant better for handling - but as has been shown, both can do either well IF SET UP PROPERLY for the intended purpose.

I thought i may need to go to a 9in for mine if the volvo didnt handle the power - i spoke to the guy who did my cage and set up the centre for me, who reckoned no need at all, if i had a problem, custom axles would fix it.. cheap...

Cheers
Stew

[JustenGT8]

That Shane's setup has survived is pretty amazing and more comfort for me

If the car suffered any axle tramp Stew, that would kill a centre quick enough?

The JZA80 setup is much bigger again (10.5 inch centre i think) is all aspects. Plenty running sub 10's in the US on the IRS and i think the current record is a 6.XX!!

Comes down to intended use and bang for buck but the A70 setup would be up to the task i reckon.

[Toy77]

Yeah i agree with you mate,

I don't think the A70 are weak at all - more responding to the comment than none have broken - we always had a feeling that supra was given a hard time in japan before inporting... drift washers under hinges (we are talking circa 2000 when it was imported from memory), dead stock setup running an fcon v, and a drivers seat that appeared to have rub marks, perhaps from a harness etc... all didnt seem to add up... low km's but no where near as tight as Andy's maroon jza70 he had at the same time (and still does).
I do remember hearing at some point that the toyota torsions didnt like hard shock loadings from drag racing - and i thought i remembered a few other breakages, but dont know those ones personally.... obviously Shanes is welded so no torsion centre there.

There are some serious cars in the states!!! again i wasn't doubting their strength, or how cool ross's car is - i like it alot, more that it wasn't really proof of toughness. Being a science kind of guy, it is all about justifying your arguement (just had NATA here again lol - and im about to go do some more stuff for them... love work on a saturday...) kind like saying i have a 1000hp turbo big block in a celica and have never broken a T series.... but i run 135 tyres on the back, and dont drive hard lol.... (mind you i think the poor little diff would just pack up and leave one day if they thought you were even considering bolting in that motor... poor little T series)

[JustenGT8]

ah torsen, that would be it then.....worm gears go pretty easy and even the housing isn't that strong. Destroyed mine in the white GT4 behind the mild 3S.

[Toy77]

i thought they were all torsen? and the ma70 clutch?

what are the jza80 ones?

[JustenGT8]

Both the complete JZA70 rear ends i got were clutch pack? My TRD one was obviously clutched

[Shakotan_Aaron]

The JZA80 setup is much bigger again (10.5 inch centre i think) is all aspects. Plenty running sub 10's in the US on the IRS and i think the current record is a 6.XX!!

JZA80 and JZZ30 are pretty close, they both run the same diff.

JZA80/JZZ30 is a 8.7"
JZA70/MX83/MZ20 is a G-series 8"

the smaller A70/cressida subframe is the weakest link in the rear end.

[JustenGT8]

Yeah my bad, remembering 200mm for the A series? and 220mm for the B series?

[Shakotan_Aaron]

not 100% sure, never really looking much into them. But i know it takes 2 people to lift the diff/housing unless your having a real go and dont mind busting a pooper valve.

[Robbos_Toyotas]

ok to settle any doubt im going to go take photos of the ass of an ra60 on monday to compare the two....will post details...