4.10 8" gear sets

[ArBrnSnpr]

I've done some searching and I'm not coming up with much.

Can anyone point out an 8" front diff that came with factory 4.10 gears that will fit the GX?

I know the Tundra has a 4.10, but I can't tell if the clamshell will fit the GX.

I know the FJC, Tacoma and 4runner have 8" options too but I can't find a 4.10.

Appreciate the help!

 

[Jstawgn]

Second generation Tacoma 4 cylinder is the only one that have factory 8" clamshell with 4.10 gear.

There are no 8" rear that would bolt in. The 8" third member would bolt on but none have factory 66x66 driveshaft bolt pattern came with 4.10 gear.

I am installing 3rd gen Tacoma 4 cylinder 4.30 8" front clamp shell and adapting 3rd gen 4runner 4.30 elocker to my 05 GX. The front is easy. The rear have been a slow process. Learn a lot about differential setup. Got to buy inch lbs torque wrench, solid Pinion spacer, Tacoma 27 spline 66x66 flange, seals and pinion nut.

The good thing I learn why the rear diff are so easy to destroy off road, especially on high mileage truck. The carrier bearing preload are just too low from factory. CBPL refresh

I was able to tighten exactly like Zuk on my original 160K mile 3rd member. 6 notches on ring side and 5 notches on the carrier side. The pinion preload torque barely change at 12-14 in lbs.

 

[ArBrnSnpr]

I have a 4.10 rear with elocker I was planning to install.

Are you saying the input flange won't bolt up?

I was considering just buying an aftermarket gear set for the front but from my searches there's only 1 manufacturer that makes a thick cut 4.10 for the 8" clamshell.

 

[Jstawgn]

Look in car-part.com
2005-2015 tacoma 4.10 Carrier assembly
There are plenty of it.

It's the rear 4.10 elocker that most likely only have 60x60 mm driveshaft flange bolt pattern. The GX use newer 66x66mm driveshaft bolt pattern. Toyota move to 66x66mm for 120 series and later.

 

[GXO]

Can change the flange if the spline count is 29

 

[ArBrnSnpr]

Thanks for the input gents.

I'll count the pinion splines and see if I lucked out.

 

[Jstawgn]

If it's coming from pre 2002 model it would have 27 spline count.
You need the flange in the link below.
Tacoma Output Flange w/Diff Dust Shield

I am currently doing this project.
You would need:
Mechanical parts:

1. 27 spline tacoma flange
2. Solid pinion spacer since I have it apart.
3. Pinion seal
4. 2 piece of longer stud for the elocker motor
5. Elocker gasket

Electrical part:

1. 20 ft of 6 conductor trailer wire. Bought off eBay
2. Fuse tap
3. Bunch of spade connector
4. Bunch of wire splice

Special tools if you want to do it yourself:

1. Inch pound dial torque wrench for measuring pinion torque. This is expensive. Got mine used for $50 but I took me more than a month checking eBay every day.
2. Good digital caliper or micrometer for measuring solid spacer shim thickness
3. Spanner wrench for adjusting carrier side bearing preload. I make my own using a couple 8 mm bolts and 3 ft unistrut material.
4. Gear marking compound for checking the gear pattern.
5. Dual indicator with base for checking backlash. I don't have this. I mark carrier side bearing preload adjuster before taking it off. Took me weeks before I realize why it does not align back after reinstall. The factory preload have become so light that I need to tighten ring gear side 6 more notches and 5 notches on the other side. This is after I found ZUK Gearinstall page on carrier bearing preload.

Not very straightforward project. But I am regearing to 4.30 and gaining rear elocker for about $1K. I enjoy tinkering, learning and doing this things. Most people look down on 8" rear diff upgrade for GX. But with solid spacer and proper carrier side bearing preload it will work for most people.

My checked the OEM 160k rear diff off my truck and I was able to tighten side carrier bearing preload by 5-6 notches on each side. The pinion preload does not change that much after this adjustment.