Axle - Gears - Lockers GX470 Upgrade Thread (14 Viewers)

[HomersCanyonero]

I checked the housing and they are indeed threaded for M10x1.25 studs (as opposed to the M8x1.25 8" housing).

I picked up one of these kits in lieu of the studs, mainly due to living in the sticks and a good distance from a Toyota dealer, I tried to assemble a kit myself, but M10x1.25 hardware is pretty darn tough to find.

Heavy Duty Toyota 8.4" Diff Stud Eliminator Kit M10x1.25

Introducing our new Heavy Duty Toyota diff stud eliminator kit. We put this kit together to combat leaking diffs that are common in rock crawling. It is common to see stock and other aftermarket studs stretch and cause a dripping rear end. We use a 12.9 bolt (176,900PSI minimum tensile strength)...

www.yotamasters.com

Interesting kit…so we can replace the factory oem bolts in the 8.2” pumpkin with these Class 12.9 (better than Grade 8) bolt so we can over torque them bolts?

 

[Rednexus]

Interesting kit…so we can replace the factory oem bolts in the 8.2” pumpkin with these Class 12.9 (better than Grade 8) bolt so we can over torque them bolts?

That appears to be the plan, although I'll likely just torque them to the OEM spec. Can't say I've ever heard of one getting loose. I also really hate dealing with studs and much prefer a bolt solution that is affixed from both sides.

 

[Super]

Torque specs are generally determined by the fastener. Going by the factory fastener spec will basically negate any advantage of the higher grade bolt/stud since you’d have no additional clamping force.
I’d use yotamasters spec and rock on.

BTW, it looks like I may be #3 to do this trussed housing in a 470. With some luck I’ll be placing my order in the next 1-2 weeks when some funds free up. Between a new welder and related stuff, a full suspension and various other things the last month or two have been expensive.

 

[5280 Lexus]

That appears to be the plan, although I'll likely just torque them to the OEM spec. Can't say I've ever heard of one getting loose. I also really hate dealing with studs and much prefer a bolt solution that is affixed from both sides.

I picked up the studs and rest of the fasteners from Toyota today. Talked to the parts dept and got an update on the housing. It shipped out so it should be here soon. Guess it has to get delivered to the big California warehouse first then it will ship to Colorado. Appears that US Toyota doesnt keep much stock of that part number ending in A91 since its not USA spec.

May be easier to order from partsouq or somewhere else if you can confirm availability and delivery time.

 

[5280 Lexus]

I checked the housing and they are indeed threaded for M10x1.25 studs (as opposed to the M8x1.25 8" housing).

I picked up one of these kits in lieu of the studs, mainly due to living in the sticks and a good distance from a Toyota dealer, I tried to assemble a kit myself, but M10x1.25 hardware is pretty darn tough to find.

Heavy Duty Toyota 8.4" Diff Stud Eliminator Kit M10x1.25

Introducing our new Heavy Duty Toyota diff stud eliminator kit. We put this kit together to combat leaking diffs that are common in rock crawling. It is common to see stock and other aftermarket studs stretch and cause a dripping rear end. We use a 12.9 bolt (176,900PSI minimum tensile strength)...

www.yotamasters.com

I would be interested to know how that kit works out it is definitely cheaper than sourcing from toyota. With plugs, gasket and studs it cost $160 for me.

 

[Rednexus]

I would be interested to know how that kit works out it is definitely cheaper than sourcing from toyota. With plugs, gasket and studs it cost $160 for me.

That's crazy! I'm 90% sure the 8" plugs will also work but we'll see.

I am skipping the gasket and going to OEM Toyota seal packing (FIPG) instead, which was around $30/tube, and supposedly gear oil specific:

TOYOTA LEXUS SEAL PACKING OEM RED TRANSAXLE FIPG 1281 (00295-01281) | eBay

LEXUS TOYOTA OEM FACTORY RED TRANSAXLE GASKET FIPG 1281 (3.5 fl oz TUBE). FIPG (3.5 fl oz TUBE) - 00295-01281. WE ARE A LEXUS DEALER SO WE CAN HELP YOU WITH ANY OF YOUR LEXUS NEEDS. THIS PART IS NEW AND BEING SOLD BY AN AUTHORIZED LEXUS DEALER.

www.ebay.com

Also - I tried to get the A91 housing from my local Toyota dealer back in December and they said it was "probably out of production", which is why I got it from Megazip at that time. I had called my dealer sometime earlier in 2024 to see if they even could get it and, at that time, there was one housing in stock in CA (but they could get it). I was a ways off from this upgrade then so I didn't buy it. So, looks like they 100% are still in production, and dealers can get them in the US, which is good to hear.

 

[Rednexus]

Started the Aussie 8.2 install today. Info is in my build thread, linked here. I probably won't have it totally tied up until later this week at the easiest, as most of today was spent on replacing rear wheel bearings and puling out the old 8".

FYI, the Yotamaster studs are a bit of a pain to install, but at least they'll never come out again like normal studs. When I zipped the 3rd member out of my old 8", only one of the nuts came out. Every other one came out as a nut and a stud.

 

[5280 Lexus]

Started the Aussie 8.2 install today. Info is in my build thread, linked here. I probably won't have it totally tied up until later this week at the easiest, as most of today was spent on replacing rear wheel bearings and puling out the old 8".

FYI, the Yotamaster studs are a bit of a pain to install, but at least they'll never come out again like normal studs. When I zipped the 3rd member out of my old 8", only one of the nuts came out. Every other one came out as a nut and a stud.
View attachment 3914968

I picked up the axle housing from toyota today and can confirm it was also the trussed housing. Going to start on the install this weekend.

 

[Rednexus]

I picked up the axle housing from toyota today and can confirm it was also the trussed housing. Going to start on the install this weekend.

I beat you, but not by much . FYI the sway bar mount bolts are M10x1.25 (instead of M8 like the 120 housing), and the 150 sway bar is a tiny bit thicker. Everything else is completely plug-and-play - brake lines, speed sensor wiring, links, shock bolts, etc.

 

[Super]

Ordered the trussed 8.2 housing and a bunch of little stuff from Partsouq today.
Still need a rear diff core.

 

[5280 Lexus]

I beat you, but not by much . FYI the sway bar mount bolts are M10x1.25 (instead of M8 like the 120 housing), and the 150 sway bar is a tiny bit thicker. Everything else is completely plug-and-play - brake lines, speed sensor wiring, links, shock bolts, etc.
View attachment 3917611

I was able to get the axle swapped in today with the help of a friend. Was definitely plug and play job went pretty smooth, maneuvering the axle out/was a little tricky but overall job was straightforward. Was able to do it without disconnecting the brake lines.

I have an aftermarket sway bar bracket and from my quick check it looks like it will bolt up if i get the right bolt size.

 

[5280 Lexus]

Ordered the trussed 8.2 housing and a bunch of little stuff from Partsouq today.
Still need a rear diff core.

I found mine off car part locally, used the carrier assembly search parameter. When i went to check it out it was in a whole assembly that had a bent housing. Worked out good was able to check that it had the 14mm nut on the third member

 

[Super]

Every time I check, nothing local pops up at anything resembling a reasonable price. Do you mind if I ask what you paid?