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Transfer Reduction With Hilux Diffs.
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Author:  superduki [ Sat Jun 30, 2012 7:28 pm ]
Post subject:  Transfer Reduction With Hilux Diffs.
Quick question for you guys out there with Lux diffs under your Sierra.

I'm in the market for transfer reduction, but an important question looms......

My setup - 4.5:1 Hilux centres, 33" tyres, under a Sierra LWB.

Previous Setup - 3.7WT diffs, 31" tyres, 5.14 gearset in the transfer case in a SWB tin top.

Once I had put the 5.14's in my old red tin top (epic solo mainland mission machine), I found it was next to useless unless it was up around the redline going backwards in mud in low set. It was neat running forwards, nice setup I thought, but useless reversing.

With my current setup in a LWB mentioned above, what is everyones opinion to transfer reduction? It's currently a stock drover transfer, but I'm thinking that with 4.5 centres, plus 33" tyre, it's going to roughly put 5.14's to the same pace of my previous setup?

Perhaps I'm best off with a set of 4.9s?? My terrain that is expected of it, is the usual 4wd tracks, mud, hillclimbs, rocks etc. It isn't built for 100% rockcrawling. I also anticipate heading to Victoria in it to sight see and do some moderate to hard tracks in the high country, so highway k's will be seen frequently.

I'm also running the Devil's engine (G13B) in it so the reduction I guess will be advantageous.

For you guys with gears or similar setups, what works? Perhaps Gwagen you've played with this kind of stuff??


Cheers and Beers, Superduki.
Author:  want33s [ Sun Jul 01, 2012 9:47 am ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
I'd be playing with a gearing calculator.
I have a funny feeling you'd be better off with 4.88 diffs and then you can use less reduction in the transfer.
Author:  BlueSuzy [ Sun Jul 01, 2012 11:14 am ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
I know a guy, He runs 1.6efi, 6.5, 35's and 4.5's. He is happy with it.
I know a guy, He runs 1.6carb, 6.5, 33's and 4.88's. He is kinda happy with it. 100pkh is 4800rpm. Ratty on here.
I am going to try 1.6efi, 6.5, 35's and 4.3's.

Nsw terrain, rock.

You don't need lux diffs on 33's.
Author:  superduki [ Sun Jul 01, 2012 11:44 am ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
Each to their own with the tyre size diff size argument.
I've had my fair share of sierras on 31s crap diff centres
And wheel bearings. I'm looking for 100% reliability, and 33s
On lux diffs should damn near provide that. Think what you want
But that's my experience with them. It's the same as running the
G13B, everyones a hater, but they don't have to drive one.

Thanks for the gearing advice, which is what i asked about only....
I'll go back to the drawing board as I'm not about to change diff
Ratios, I guess I'll just suck it and see how I go.
Author:  shep [ Sun Jul 01, 2012 3:05 pm ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
Mine is in the process of being 35s, 6.5s and 4.88 Toyota diffs. That is with a 16v 1.6 and 4 speed auto.
Author:  SierraDan [ Sun Jul 01, 2012 3:25 pm ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
Mine will be 1.3/1.6 on gas, 6.5's, 5.29's and 37's.
I'd say 4.8's will be the go for you.
Author:  Brenno [ Sun Jul 01, 2012 4:45 pm ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
I would say suck it and see gosford, it's only until you drive it that you will see how many revs at 100 you will need to maintain speed, similarly, you will need to see how low range is effected. I will definitely think you will need tease gears of some sort, as even with 5.12 vit diffs, low range is crap with 33's especially being manual. Possibly 4.9s might work well. You can always borrow my 6.5 case and test it before you go throwing cash at it.
Author:  TryHard [ Sun Jul 01, 2012 8:56 pm ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
Each to their own with the tyre size diff size argument.
I've had my fair share of sierras on 31s crap diff centres
And wheel bearings. I'm looking for 100% reliability, and 33s
On lux diffs should damn near provide that. Think what you want
But that's my experience with them. It's the same as running the
G13B, everyones a hater, but they don't have to drive one.

Thanks for the gearing advice, which is what i asked about only....
I'll go back to the drawing board as I'm not about to change diff
Ratios, I guess I'll just suck it and see how I go.


Why is my question u are going to run 33s on lux diffs and lose clearance on your diffs because the lux diff pumpkin is bigger ,
your better off beefing up ur Suzuki diffs and running 33s or sticking with 31s there is nothing wrong with 31s.
. why are u wanting to go bigger

FYI theres no such thing as 100% reliability all comes down to maintenance and how u drive plenty of people run 33s and have no trouble

also another thing running lux diffs means u need to run spoa to make it easy other wise u will have a bit of work running spua .. also the legal factor
Author:  Brenno [ Sun Jul 01, 2012 11:11 pm ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
Tryhard- answer the question or pipe down. It is 100% legal and its not all about diff clearance. Wheel bearings, unis, TREs etc will all wear out quicker (or are not built for 7inches over standard tyres) and then there is the lack of rear axle strengthening option (unless you are gwagen and have mad skills).
Author:  jonno_racing [ Mon Jul 02, 2012 12:03 am ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
keep in mind my old truck.
gti/6.5/3.9/31s. I could grab high range in reverse and 4th low in mud. worked berry well.
check out a gear ratio calculator.
also try hard have a look in his build this truck is as good as it gets.
Author:  SierraDan [ Mon Jul 02, 2012 4:09 am ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
The difference in diff clearance is barely existsant in the real world. 31zook's old LWB on 36" swampers and lux diffs had something like 30mm more clearance than my 31's and zook diffs..

That "loss" is fair outweighed by the strength of the hilux diff.
Author:  shep [ Mon Jul 02, 2012 5:56 am ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
SierraDan wrote:
The difference in diff clearance is barely existsant in the real world. 31zook's old LWB on 36" swampers and lux diffs had something like 30mm more clearance than my 31's and zook diffs..

That "loss" is fair outweighed by the strength of the hilux diff.


considering that a 75 series landcruser on 33s has the same diff clearance as a sierra on 31s then i would be very surprised if
there was 20mm difference between a sierra and a hilux if they are both on the same sized tires.
Author:  BlueSuzy [ Mon Jul 02, 2012 5:50 pm ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
Im not bagging out suz or toy. Jus sayin

My last zook was 33' on zook. The diff problem can be fixed with a solid pinion spacer, and bearing probs? Keem them out of mud and maintained. No problems. Like any bearing.

I wanted 35" = toy difs.

Clearance is not a problem. I could of shaved them, but more work i didnt want for not much.
Author:  TryHard [ Mon Jul 02, 2012 11:23 pm ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
Tryhard- answer the question or piss off. It is 100% legal and its not all about diff clearance. Wheel bearings, unis, TREs etc will all wear out quicker (or are not built for 7inches over standard tyres) and then there is the lack of rear axle strengthening option (unless you are gwagen and have mad skills).



First off you do not need to much such a rude ass hole about it ..
did not think there was any harm in asking questions ,sometimes people rush into doing things with out thinking things though ..

2nd how the F**** i running hilux diffs 100% legal as far as i know u cant run it over here may be different over there Specially with the SPOA

3rd sorry i did not answer the question for him but thought id contribute my opinion

4th :thefinger:
Author:  Fatzook [ Tue Jul 03, 2012 12:09 am ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
TryHard wrote:

2nd how the F**** i running hilux diffs 100% legal


they aren't legal.



But they ARE engineerable. :wink:
Author:  Brenno [ Tue Jul 03, 2012 11:03 am ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
Double post
Author:  Brenno [ Tue Jul 03, 2012 11:03 am ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
Sorry tryhard.

Fatz can you explain a bit more on te engineerable/legal issue?
Author:  Fatzook [ Tue Jul 03, 2012 11:15 am ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
Brenno wrote:
Sorry tryhard.

Fatz can you explain a bit more on te engineerable/legal issue?



You need me to explain it? :?

Hilux diffs in a sierra are illegal, without the prior consent and approval from a transport dept. approved engineer.

Find an engineer who has the RTA's blessing, and see if they are willing to put their signature to paper for you.
Author:  Brenno [ Tue Jul 03, 2012 3:39 pm ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
Ah, I interpreted what you said wrong, cheers
Author:  TryHard [ Tue Jul 03, 2012 6:46 pm ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
so fatzook is that just over your way or here in WA too .. also is that SPOA or SPUA ?
Author:  Fatzook [ Tue Jul 03, 2012 9:00 pm ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
TryHard wrote:
so fatzook is that just over your way or here in WA too .. also is that SPOA or SPUA ?



Every state and territory in Australia are governed by ADR's. I'm para-phrasing, but the fitment of wider diffs, regardless of suspension, will require the consent of an authorised engineer.
Author:  shep [ Tue Jul 03, 2012 10:05 pm ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
Fatzook wrote:
TryHard wrote:
so fatzook is that just over your way or here in WA too .. also is that SPOA or SPUA ?



Every state and territory in Australia are governed by ADR's. I'm para-phrasing, but the fitment of wider diffs, regardless of suspension, will require the consent of an authorised engineer.


dont need a engineer in the NT :wink:
Author:  superduki [ Thu Jul 05, 2012 11:51 am ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
I haven't rushed into anything champ. I've owned sierras for ten years on and off now,
And been a mechanic for almost 9. Without pulling my
Pee pee too hard, I do know a little bit about maintenance
and experience with busting alot of Suzuki shit on 31s.
I'm hard on all my cars, I expect alot. 33s look neat and
tidy on a road driven Sierra, I believe 33s won't stress the Hilux
Final drive setup, and won't slow it down on road as much. We do quiet
a few road k's to get to decent tracks here. This thread isn't a bash me thread, just a gearing question. If you must know, all my modifications are approved in principle by transport, and the whole lot of you can admire the fact it will be 99% legal (33s are too big). I want this thing to be insured and 99% roadworthy, still spoa too. Hope that's enough to understand my situation. As for the whole diff clearance size issue, who really cares? It's a socially wheeled car, if twin air lockers, 33s, twin winches, good driver with good wheel placement can't drive it, I'll get you to show me how it's done! Bam. :wink:
Author:  appsie [ Thu Jul 05, 2012 12:57 pm ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
i dont think the 20mm in clearance between lux and zuk will upset you anyway for all the added advantages. its steel anyway,drag it Armsup

good luck with it all
Author:  Brenno [ Thu Jul 05, 2012 4:33 pm ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
Was thinking about this more Grice and realised you cant have a lend of my Tcase - mine has the transfer handbrake.

I did some sums today using my gearbox final ratio and 4.55 hilux diffs and it was 3450 at highway speed using a 4.9 case (with a 1.411 highrange, 16% reduction). that is with a .783 final drive ratio CA box though, might be different with yours, but thats what I would be aiming at I reckon.
Author:  superduki [ Thu Jul 05, 2012 5:38 pm ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
Cheers Brenno, the cost of 4.9s aren't a huge amount different to a complete gearset of 6.5s. I think I'll go for the 4.9s. As for the transfer,
Remember mine is lwb, had the transfer handbrake too. However my drum stud pattern is now Hilux!
Author:  superduki [ Thu Jul 05, 2012 5:39 pm ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
Cheers Brenno, the cost of 4.9s aren't a huge amount different to a complete gearset of 6.5s. I think I'll go for the 4.9s. As for the transfer,
Remember mine is lwb, had the transfer handbrake too. However my drum stud pattern is now Hilux!
Author:  Brenno [ Fri Jul 06, 2012 8:14 am ]
Post subject:  Re: Transfer Reduction With Hilux Diffs.
Of course! Well you are more than welcome to come and grab mine for a test if you like. Just swap the drums over and you are away. I am very interested to see how you go as well.

The whole trip up the west coast (Balfour and sandy cape) I went into low range about twice. It got too annoying going back and forth so I just kept it in high range. It's tracks like Cumberland that it's great having the really low gearing.

Let me know if you wanna grab the case sometime. Zook is just sitting I the shed limp at the moment,
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