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Discussion Starter #1
Did some digging.

Most current Toyota PN for 3.73 7.5" ring and pinion is 41201-80107. Cost from Mr. T is around $850 USD *ouch*

Looks like it was used in the front axle of KZN165 diesel Hilux trucks, which are fairly common in Australia. Replacement R&P is available through aftermarket retailers for a more reasonable rate:

https://www.allfourx4.com.au/Crown-Wheel-Pinion-Kit-Toyota-Hilux-KZN165-Front-41201-80107
https://www.terraintamer.com/en/4wd-products/transmisson-driveline-cat/crown-wheels-pinions

Not sure why it comes with a new flange... But could be worth a shot for someone? Perhaps directly contacting them you could order just the gears and save some $$...
 

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Discussion Starter #2
087-012396k is a good PN too - might be the same kit, but is from a company called 'drivetech'
 

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Going brand new is a surer bet for quiet operation. Used, the same F code 7.5" R&P is plentiful in the Previa vans. It is a solid axle though so the internals will require swap out from the pumpkin to the clam shell. The u joint mount on the pinion flange is larger so it might offer and improvement it strength if it can match the driveshaft.
 

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Discussion Starter #4
Yeah the larger pinion flange is a popular upgrade - it is also on the front of older pickups and 4runners. 3.73 gearsets can be found on supercharged previas, older 2WD pickups, 4cyl 2wd 2RZ powered tacomas with automatic transmissions, some Cressidas, '82 mk2s, among others.
 
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Lexus IS250.

When I was new to the forum I figured that out on my own. Got told I was thinking too hard. Then other people started doing it. Makes me smile.
 

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Discussion Starter #7
Which one did you order?
 

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Discussion Starter #9
Ok so the drivetech one. The flange won't fit your driveshaft unless you already upgraded the input flange on your diff with the larger one from a 4Runner/pickup front diff (and got a custom driveshaft built to suit). The seal should work though.
 

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Yeah, as of right now I haven’t but it’s a project for the spring when this all goes back together.
 

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Discussion Starter #11
The upgraded flange should measure 60mmx60mm square for the hole pattern and a 10mm diameter. Would be good to know if the stock input flange fits on the pinion gear (it should). Don't forget you will need a good set of side and pinion shims to get the new gears set up properly.
 

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Ken just received the Australian ring and pinion this morning. Seems good, no markings on the R/P but showed up right with a 3.73. He’s sent a few pictures so I will update here over the next few days.

Going to get it REM polished/super-finished as I don’t want a repeat of my last purchase where the gears were worn out. I’m hoping this will be the last diff I do on this car with this set up.
 

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Discussion Starter #13
You shouldn't need to refinish or micro polish them as they are brand new...
 

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Came as a suggestion, may be overkill but I don’t know the mfg and how high grade these gearsets are. Few hundred bucks in the investment but I already bought the diff just to find out the gears are worn out...so I want this to last and I’d rather do it right once.
 

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Discussion Starter #15
Fair. Biggest thing is making sure the contact pattern and backlash are correct. Especially the pinion depth (pattern).
 
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