T,F or G series? What to choose?

[Big T]

Hey guys,

I've currently got a T-series with a TRD 2way lsd. I've already got a rear brake upgrade done like so: (sorry bout the crap pics)




The car will eventually make around 200rwkw. I already know that i should upgrade this diff as it's only a matter of time before it shits itself. I'm trying to figure out the most suitable upgrade. Here's the options:

1. MX1x or MX23 F series.
2. RN4*/YN4* Hilux G series.
3. RN2* Hilux G series.

I'm not worried if they come with drum/disks as i'll be converting my current brembos to the axles (hopefully). In regards to this, do all live axles follow this sort of setup?



so i can just remove the drums/disks and have my current adaptor plate modified to take a different bolt spacing?

I also need a 15-20mm spacer to clear these calipers so the narrower RN2* might be a good option. But both G series will require redrilling.
If anyone also has the prices they paid for any of these axles or work done to cut/reweld their shock/trailing arms please include them Thanks in advance!

Eddie.

[Norbie]

G series diffs are big and heavy. It's overkill for your proposed power output so I suggest you stick with the F series, which is more than up to the task.

FWIW some Tarago's have F series diffs with 4-stud axles (see other thread on Toyota diffs); you might find these easier to locate at the wreckers than MkII's.

[gianttomato]

Tarago or MS112 Crown for F series diffs - you just won't find an MarkII diff anymore.

I'd opt for the MS112 diff - nice thick axles and beautiful (but expensive) double row axle bearings. You'll just have to redrill it to 4 stud. It's 1410 mm wheel mounting face to wheel mounting face.

I also wrote an article regarding converting a G series Hilux diff to fit in my MarkII and fitting disc brakes - it also had a pricing schedule. Read about it here.

[JustCallMeOrlando]

I'm with Norbie, an F-series would be more than adequate, especially for a 4A, and especially in a car that light. It's just not going to have the load on it to break it.

[JustCallMeOrlando]

Oh, and I forgot to mention again, love the brakes

[brett_celicacoupe]

Tarago or MS112 Crown for F series diffs - you just won't find an MarkII diff anymore.

I'd opt for the MS112 diff - nice thick axles and beautiful (but expensive) double row axle bearings. You'll just have to redrill it to 4 stud. It's 1410 mm wheel mounting face to wheel mounting face.

I also wrote an article regarding converting a G series Hilux diff to fit in my MarkII and fitting disc brakes - it also had a pricing schedule. Read about it here.

GT; hen just measured his MS112 diff and it measured 1450 disk face to disk face. he also PM'ed me regarding this and told me that they need a rim with a huge centre hole.
so there are the disadvantages of this setup.

i might be selling my MX13 diff(converted to ra40) soon because ill be going to 5 stud all round..... using a crown F series diff of some description.

so yeh probly the YR22 tarago diff is the best bet. PM "hen" i think he may know the drum to drum width of it.

[JustCallMeOrlando]

Brett, can you get him to measure the size of said centre hole, I was under the assumption they would all be around the same size?

[The Witzl]

The G series diffs have a slightly different way of the axles bolting into the axle housing compared to the Ts and Fs, you are welcome to come and have a look at the G series in my garage to see if it will work for you brake setup.

While you are here you can collect that camshaft too

EDIT: norbie has too much love for his F series. It will be his undoing! hahaha

[brett_celicacoupe]

this is the PM

I read you are thinking of running an MS112 crown diff in your RA40. I had such a diff in my Sprinter for a while (out now due to some other problems) and getting wheels to fit was a bitch.

5 by 114.3 is common, but the Crown centre bore is 67mm, and so most factory wheels wont fit unless you have them enlarged.

AU onward Falcon wheels fitted OK but being a minimum of 16" they were simply too big for me. Another option are Magna 15" steelies. Maybe something to get started on before buying a nice set of wheels.

Aftermarket wheels apparently always have big centre bores, so they shouldn't be a problem.

[gianttomato]

I can guarantee you it's 1410mm (+ or - a few millimetres) - it is exactly the same width as an MX13 diff.. Centre hole is 67mm (identical to the MX13 diff) and is much smaller than all the Ford aftermarket rims I have ever owned (generally 71 to 76mm). This also makes it a simple process to make a hubcentric spacer. The double row axle bearings also support the outer portion of the axle so you don't get annoying pad scrub (ie a horrific noise) when cornering at high speed on the track. I ran AU 16 x 6.5" steel rims with no scrub issues on my Mk2. It comes with disc brakes (solid rotors and narrower MA61 style calipers) which are extremely easy to upgrade to vented. I did this for the paltry sum of $150. I'll try and get photos they're on my home computer and I'm at work......

I would recommend this diff to anyone.

[Dom-AE71]

to help fund your upgrade eddie id gladly donate some funds in exchange for your old center.

BTW brett, im pretty sure eddie wants to keep his 4x114.3 stud pattern as he's jsut bought a set of longchamp xr4's

[Hen]

I pulled my Crown diff out at Pick a Part a while ago. It is definitely 1450mm, and was definitely an MS112.

And as for the hub size, Ford wheels all seem big enough, it is just Jap stuff like Mazda, S14, S15 and Honda wheels which wont fit nicely.

And if you want to keep it 4 by 114.3, try a YR22 Tarago F diff. Comes factory with a 4.3 ratio too.

Hen

[The Witzl]

Hen, you most certainly WONT have an MS123 diff, because the MS123 was semi trailing arm IRS, just like my old UZS131

[gianttomato]

MS123 is IRS so it won't be one of those. I'll check again on Friday or Saturday and adjust post accordingly.

[brett_celicacoupe]

very interesting regarding that MS112 diff width.

i found from another source (old toymods) that a NZ guy, "AE25" said the MS112 diff is 1470 wide

what the?

here it is

heh
would just like to amend the ms112 crown diff width
i have one and it measures 1470mm disk to disk. also these have an internal drum handbrake, 160mm solid disk. also there was an ms110 at the wrecker and the diff looked the same. these are a 3link + panhard (only one top link). can take pics if theres interest. the 5 stud have a bigger spigot ring to locate the wheels so say good bye to your stock 4 stud wheels.

MS123 is IRS btw