Supra Vs Hilux Diff - How To

[Hokey]

does the centre from a 4wd hilux fit straight into a 2wd diff. say an rn27 model?

Cheers

[6appeal]

So you wouldn't have the clearance issue on a yn56 hilux? Also, if someone has the part number for the bearings used that didn't require any machining, that'd be a huge help

[Adsport]

6appeal, spotted your thread dig. im working through putting an MX83 LSD into an RN46 housing at the moment. after doing measurements i came to the conclusion of just being able to find replaceable bearings so that no machining is needed and its good to see that my opinion was matched (albeit long ago ahah). I was intending on reporting my results for posterity.

[6appeal]

I gave up asking questions and paid through the nose to have someone to the work for me

[Adsport]

do you have any idea what bearings were used?

[convertableTA23]

for the side carrier bearings just ask for the ones for the front diff in an 80 series landcruiser, or the ones used when an air locker is installed in a 4wd hilux. The bearing part number 38080 comes to mind but i couldn't be sure right now. I can get these bearings for about $45 for the pair from my local bearing shop and use them quite often when fitting diff locks at work....

As for the crush spacer, don't use it, use a solid pinion spacer. These are available from most 4wd parts outlets. Get one for a 4wd hilux. It comes with a small selection of shims to set up the correct pinion bearing pre-load and is much better than the crush tubes, and is reusable, just takes a wee bit longer to set up. If you like to shop online get on to locktup4x4 and buy the kit for the hilux diff, just be sure to let them know it is for a air locker fitted centre so requires 50mm i.d. side carrier bearings and they usually swap them in for no extra charge.

If you need confermation i can check that part number tomorrow, an q's send me a pm. Diffs are actually quite easy as long as you have the right equipment and some paitence

[madmont]

conclusion of just being able to find replaceable bearings so that no machining is needed and its good to see that my opinion was matched (albeit long ago ahah). I was intending on reporting my results for posterity.

try for 32010 JA1 bearings . JA1 is the designation for a bigger radius on the inner race

[Adsport]

ahh thanks for the heads up about the solid pinion spacer, i was thinking that i would have to get one machined... i will investigate that!


will chase up the 32010 JA1, thanks!

[convertableTA23]

My memory failed, but your's is pretty good madmont. The part number is definatly 32010 (timkin part number) for the 80mm od bearing to suit. Just be aware that the boss told me that some toyota 3rd members require a 83mm od bearing, I have never personally seen one, but he recons they exist, and he has forgotton more than most know about 4wd's, especially landcruisers and hiluxs. If your 3rd does require a 83mm od bearing the part number is TR100802-2 (SKF part number).

If you have a bit of time, already have a torque wrench and other basic tools like a socket set, hammer, punches, etc buy yourself a dial indicator and magnetic base for about $120 and do it yourself.

[Adsport]

cheers for that, i did some quick measurements with the digital vernier and the 32010 is the right size. I'm tempted to go for an NSK or koyo bearing though (the koyo part number is the same with JR as a suffix).

I've already got all the gear to do the job (I'm a mechanic at a performance shop) but im not very well versed with setting up diffs, and we usually just give them to a shop down the road to do for us so what i was trying to do was get all the parts and strip it myself, leaving all the assembly and setup to the guys who do it everyday...


my housemate is longtime friends and used to work at locktup so he is going to get me the solid pinion spacer kit from locktup and i will get the other bearings myself from CBC


so to answer the initial post, you use the banjo diff pinion bearings, 32010 side (carrier?) bearings and it all goes in. im using MX83 clutch type LSD with the plates swapped around . i suppose you could use a JZA70 or similar G torsen but most of them are flogged out and arent very good anymore from my experience.

[madmont]

You might need a 3mm spacer under the crownwheel
Hilux lsd would be easier. they are the same apart from the offset, bearing size and axle hole

[Adsport]

ah right. The MX83 unit cost me $50 and its in great condition so unless the cost of setting it up outweighs the cost of replacing it with a clutched hilux diff im keen to try it hehe

[TTV8RA23]

Clutch hilux LSDs are arse even shimmed up to buggery they will single spin most of the time with anything over 250hp. Good to see this thread on here i was looking at my mates G series Torsen center out of a supra and thinking it looked bloody close to the same center as the hilux one in the back of my celica and would be a good solution to shit hilux LSD centers!

[convertableTA23]

In my past 4wd experience, pull the slip centre apart and sandblast the non friction plates (the metal ones). correct plate order is critical too. I have even seen an extra plate wedged in each side to "shim" it up. Use good oil like lsx90 and change it often for best use. My brother has a rn105 hilus, air locked rear, lsd front that we built up with just sand blasted plates and a couple of washers under the spring and it goes great even with grippy 33s on rock, you can actually see the centre gripping and slipping at low speed. The biggest problem with toyota lsd's in my oppinion is lack of servicing and light preload settings from factory.

[TTV8RA23]

Two mates have them in there cars all done properly with right order etc etc and big shims put in so its almost jammed solid but still start single spinning very quickly. In a big 4WD at the slow speeds they operate under its a fairly different story.