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Discussion Starter #1 (Edited)
Hey All!

I don't spend a lot of time here but wanted to share a nice MKII rebuild I performed.
Typically I spend most of my time rebuilding MKIII differentials and shipping them all over the country as well as overseas.
I mostly spend my time on SupraMania under the same username.

This is the 1st individual that has requested a MKII differential from me. (Not for sale)
I just wanted to share the condition of this MKII diff, as its one of the lowest mileage / cleanest I have ever come across.
Even as received it was super clean, thought it was worth showing.

I can't say I have seen many diff's with ~30k miles. This has to be some sort of anomaly!
Even the rear aluminum cover is in its original die cast finish. (no sandblasting needed)

I swapped gear ratios for this one to 4.10. (Had 4.30)
Upgraded the LSD with the Weir kit.
Also switched to the solid pinion spacer.

Esentially the same upgrades I usually do for the MKIII's.

Also took some comparison measurements side by side with the MKIII, just for curiosity sake.
Side shafts/LSD Plates/LSD Construction ect..
Its interesting to see some of the same design attributes that were carried over to the MKIII from the MKII.
Also pretty clear the improvements implemented and weaknesses that were corrected with the newer MKIII.
The MKIV is a whole different level beyond this, but will get to that at some point.

Photos for your enjoyment :D
















Check out the factory machining marks still on that side gear!





Comparison of the LSD plate stack to the MKIII.

 

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Whoa awesome pics, thanks for sharing. If you give a ballpark price and location so people can estimate shipping your way you might just get a few more on your plate. So hard to find people who can set these things up right.
 

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Impressive props for sharing!! MKE = Milwaukee??

Lots of us including me need LSD's rebuilt, what services can you provide?
 

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Discussion Starter #4
Yes I am in Milwaukee.

Prices depend on what someone wants done.
Different gearing / different LSD carrier / LSD upgrades / solid pinion spacer / ect..
Feel free to PM me for prices..
 

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Copy Thanks!!
 

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Ditto!
 

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How much for the solid pinion spacer and do you have one in stock? Only thing my Truetrac diff needs. Would like to change it when I install the "large" pinion flange.
 

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I'm sure you'll be a popular member here in no time with this thread.

I have a 3.73 with a blown LSD that deserves attention.
 

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Looks good! I'll be building an exact duplicate of that for myself soon for my mk2. I have all the bits, just need to find the time to put it together lol

Hey, speaking of the diff evolution, what did Toyota do for setting the pinion backlash on the mk3? I noticed Weir doesn't sell a solid pinion spacer kit for it, I assume Toyota basically did something along those lines from the factory? The crush sleeve was a dumb idea.
 

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Discussion Starter #14 (Edited)
Good deal SupraFiend.
Yeah recommend upgrading everything.
The LSD especially is weak in the MKII from what I have observed. Lots of gains there to be had.

MKIII has multiple (30) different thickness side carrier plates to set backlash as well as carrier preload (at the same time).
Similar to the MKII but the plates are a different design as well as different ID and OD.
You have to make the measurements and calculate the 2 plates that will set preload and backlash correctly. (R&P backlash and carrier bearing preload)
The plates are $5 a pop from Toyota so you want to ensure you calculate exactly which to order, otherwise it starts to get expensive quick.

The MKIII has a crush sleeve from the factory as well.
Weir does have a solid pinion spacer for the MKIII, it is down the page a bit.
The solid pinion spacer of course sets the pinion bearing preload.
The shim behind the pinion head sets the depth of the pattern on the face of the ring teeth.

Toyota used solid pinion spacers on older differentials from the factory, but they moved away from them in the early 80s I believe.
Probably due to easier setup from the factory. Quicker manufacturing.
 

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Discussion Starter #16
Yes the LSD design is much much different.

The last photo shows the size and quantity of the LSD clutch pack between the MKII and MKIII.
I have other photos I could post up comparing the MKII LSD design to the MKIII.
 

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What we need is Weir or someone to make solid spacers to replace the now NLA crush sleeves for the rear control arm bearings.
 

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Discussion Starter #18
Do you have a link to this component? (photos, location, ect)
I am not familiar with the crush sleeves for the control arm bearings.
 

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Discussion Starter #20
Oh interesting.

The rear wheel bearings set the preload with a crush sleeve.

From that thread it looks like they figured out a 7.5" solid pinion spacer might work.

Though I see no mention of the min OD that will still fit over the hub.
Hard to say if a 30mm solid spacer will fit without modification over the hub.

Even if you used a solid spacer when doing new rear wheel bearings I don't expect many shops willing to put in the time to install correctly.
They would need to dissassemble and re-assemble at least a couple times to get the correct shim stack and measure preload.
Setting up a solid spacer correctly is quite time consuming, but once you get it...man is it good. :D
 
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