hilux diff models.....which one?

[Forcefed6]

I would suggest looking into a Commodore/Falcon/R31 Borg warner. They are cheap, plenty of parts available. Disc brake already.

Quite a few of the faster VL's down south still use a borg warner, and manage to get there much heavier cars in the 10's without breaking very often.

Although, am I correct in saying that the Hilux axles are 30 spline as apposed to the borg warner 28 spline.

If you were to go the hilux way, you should also be able to use the LSD and gears out of a later supra diff.

Other options instead of LSD are a lockright type diff (mechanical locker). These stay unlocked until there is a certain amount of load on it.

Anyway, goodluck with your decision.

[chris davey]

I have just swapped from a Mitsu diff to a Hiace. Hiace is g series as well but 1470mm wide. Drum brakes also but I imagine anything that would fit hilux housing would fit hiace as well. I am happy with the drums though.

I was going to go down the cressida 3.9 gears into a hiace/hilux housing but in the end found a 4.11 hilux centre (non lsd) and got that welded up. I had a thread and there were 2 others about fitting the IRS gears into the non IRS housings. You will have to take it to a diff shop that know what they are doing. What put me off is that one of the places that had already done it didn't seem to know very much about it. As I am no diff expert I thought it was easier to ge the 4.11's and be done with it.

I was also looking into the BW78's as they are cheap and as they say lots of quick VL's etc. However, I also like the banjo type diffs so that didn't help. Most ratios were very tall at around 3.23 or something like that. And apparently with these types of diffs you have to get a diff shop to swap the gears in them rather than just a whole pumpkin swap (unless you know how to set backlast etc. and I don't).

In summary, I would probably get a hiace housing if they are cheaper as you are getting shortened anyway. R31 disks and then redrill studs if you want 5 stud. You can get 3.7:1 LSD's out of newer hiluxes. See the toyman75's members ride thread for details. They aren't called G series anymore but they are 8".

HTH

Chris

[30psi 4agte]

Hmm so many options. I can get a BW easily but like you say chris i like the banjo type as if.......... Should i say WHEN i break it i can do a straight swap and not have to worry about back lash settings etc etc.

Im prepared to pay a little extra to get a disc brake rear and if a could get a LSD centre that would be a bonus!!

Just on the rear disc issue......
Anyone tell me how thick they are?
Are they vented or solid ?
Is the hand brake on the caliper or a internal drum setup ??

I could then just swap the crown wheel and pinion to change ratio ??

Anyone have an idea of what i may expect to pay for the later model diffs ??

There's a few questions there ..... Sorry guys.

Ill prob beable to get to the wreckers some time this week to sus them out . From there ill get a bit better idea of whats going on.

[Smokey228]

Although, am I correct in saying that the Hilux axles are 30 spline as apposed to the borg warner 28 spline.

I can confrim they are 30 spline. I counted it just the other day...

Just on the rear disc issue......
Anyone tell me how thick they are?
Are they vented or solid ?
Is the hand brake on the caliper or a internal drum setup ??

Not 100%, but from memory...
They are about 28mm thick. Vented and i think caliper hand brake...

Cheers,
Jase

[oldcorollas]

what about using F series? not as heavy.. tru-track centre...

i vote for internal drum handbrake....
1. if you stop with hot brakes, you can use handbrake to stop rolling, instead of getting resin stuck on the discs...
2. it makes the caliper a heck of a lot less messy

3.... look up norbies diff databse...

[bigmat]

you wont find an off the shelf 3.9 for rn25/27. i have been through this only a month a go. best i could get was 4.1 from commercial toyota wreckers on port road. down near the end. 3.9 can be made and eg crowns swaped and stuff for $1500 to achieve 3.9. i was then advised by a work shop 4.1 would well and truely be good enough. second hand 4.1 lsd should be about $750. hope this helps. ps your ride is very nice.

[Big T]

I've built a few diffs for sprinters now using both F and G-series as donors. With the sort of power you're pushing though, id lean towards the G-series for the additional security. Depending on what stud pattern you want will affect your rear brake choice as well. How wide do you want the diff to be? The shortest ones are 1370 and the widest 1570.

In regards to brakes, i normally choose one of 2 options.

1. R31 disks and calipers: Great if you want to keep it 4x114.3. The brakes are a single piston sliding caliper type with a solid 260x10.5mm disk. They come with an inbuilt handbrake so just the cables need to be made up. I can source you the adaptor bracket for this as well if you like.

2. MA70 Internal Drum calipers and disks: Comes standard in 5 stud. Vented 291x18mm disk with single piston sliding caliper. Needs much more machining (therefore costs) but Gianttomato has a very nice adaptor bracket that makes things much easier. Again, handbrake cables need to be made but seeing as it's all Toyota, you could probably find something stock that would fit.

These are probably the 2 most common options. I normally use R31 setups for people due to availability and cost but i think the MA70 setup has the best of both worlds... big disks and internal drum handbrake. Keep in mind, these are only 2 ways of skinning the cat... you can fit anything onto anything with the proper adaptor bracket and disk. Hell, i've got twin pot brembos on an st141 internal drum, r33 gtr disks on an F-series diff!

And you can find a stock 3.9 ratio CW&P... just need to know which cars to look for them in In terms of interchangeability, normally 4 pinion LSDs wont fit into 2 pinion hemispheres (2 pinion being the 1370mm 2wd type) but a quality diff shop will have no problems working around it. IRS cw&p wont go into ANY hilux housing without mods as the ring is at the wrong offset. Bearings are worth getting new and to suit YOUR setup as there are many many different combinations of these on both the carrier and pinion bearings. Again, get the diff shop to choose the right ones for you.

Eddie.

[30psi 4agte]

Thanks bigT great info.

Im thinkng of using R32 calipers to match with what im using on the front, so ill prob go for a internal drum type setup.


Im gonna have the diff shortened anyhow to suit the 1255mm track im gonna use. ( so i can fit some fat rubber )

So the studd pattern will be of no concern either.

Im might use the ma70 hand brake drum setup + discs and use the R32 calipers on them.

[Jedi]

Dont know if it helps but here is the ratios from the 4wd Luxes:

Hilux/4runner:
Petrol.
79-83 =4.875
84-88 =4.875
88-96 =4.875
V6 4runner =4.3
96-? =?
?-? ?

Diesel`sdosn`t include surf`s)
79-83 =4.875
84-88 =4.56
88-96 =4.3
96-? =4.56
96-? TD =
?-? =?

Another way to check the rear diff ratio is by the trans/axle code:
G = 8" crown wheel
next 2 numbers is the ratio code:
14 =4.875
25 =4.56
28 =4.3
?? =??
last number is the pinion type
2 =2 pinion
3 =2 pinion LSD
4 =4 pinion
5 =4 pinon LSD

[TheToyman75]

If you decide to go the Hilux option you need to spend some time at a late model (99 onwards) 4WD wreckers. 3.7 and 3.9 are available. 3.7's I have in both my Celicas (Both from different models. Check my members rides threads) and when discussing options with Toyota a 3.9 was mentioned so is out there, you just need to know where to look.

As a guide I paid $990 for my 2006 model 3.727:1 Ratio LSD centre complete with tailshaft yoke. It had only done just over 2000k's

Oh and yes they are 30spline and 30mm Diametre.

My 2006 centre was a tight fit in the diff for my RA28 but the gears will fit in an early housing, It Will just take some clearancing. If you look at the late model housings they are notched where the banjo bolts up. The early housing are not.

I got around this buy using an Airlocker centre in my RN25 housing as being drag oriantated it was the most logical choice of centre.

[infotechplus]

2. MA70 Internal Drum calipers and disks: Comes standard in 5 stud. Vented 291x18mm disk with single piston sliding caliper. Needs much more machining (therefore costs) but Gianttomato has a very nice adaptor bracket that makes things much easier. Again, handbrake cables need to be made but seeing as it's all Toyota, you could probably find something stock that would fit.

Handbrake cables onto an Hilux with the MA70 rear disk conversion, you can use cables from early 80s Liteace but you need the passenger side only so you will have to find two vehicles or ask your wrecker to supply two passenger side hb cables. They bolt straight up. You should get them for about $20-$30 a pair - saves having expensive cables made up.

Cheers,

Peter