80 Series Front End Upgrade - Is it possible???

Submitted: Friday, Nov 03, 2006 at 17:46
ThreadID: 39132 Views:10303 Replies:4 FollowUps:11
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I have a late 1990 model 1HZ GXL 80 Series Landcruiser with the usual sloppy drivetrain problems, spongy brakes, and a diff that is starting to sing.
I have long thought of fitting the post '94 model discs and calipers to provide better braking. I have also planned to fit the later model CV's, splines hubs etc. to help eliminate the slop.
But now that diff is singing a bit and I have just done a front pinion seal I thought finally, the time has come to go right through the front end and fix all of the issues at the same time. No doubt this will cost a bit.

I have just been wondering if it is possible to purchase a complete disk to disk front diff housing from a post '94 model at the wreckers and get everything I need in the one hit. Surely this has to be easier than doing an upgrade to my current bits even if I have to spend a little on the one from the wreckers.

Does anyone know if this will fit straight in or are there differences in the mounts for the panhard and trailing arms etc ?
Are all 80 series diff ratios the same?
Is the track width the same as mine on the later models?
Anything else I should be aware of?

Thanks in advance Guys,

Brett
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Reply By: Member - Jack - Friday, Nov 03, 2006 at 21:49

Friday, Nov 03, 2006 at 21:49
not be a bad place to float your query. Lottsa info there that could be helpful.

Jack
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Follow Up By: Member - Jack - Friday, Nov 03, 2006 at 21:50

Friday, Nov 03, 2006 at 21:50
Whoops .... that should have started with this link.
Jack
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Follow Up By: Member - DOZER- Saturday, Nov 04, 2006 at 12:44

Saturday, Nov 04, 2006 at 12:44
I can help with the parts if you can get them from wollongong to you...0408965433
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Reply By: Beast of Bodmin - Saturday, Nov 04, 2006 at 07:57

Saturday, Nov 04, 2006 at 07:57
Hi Brett,
I'm sorry but l cannot give you the answers you want but l've had the exact same question in my mind since a guy on here suggested to fit the larger disc brakes and calipers off a newer truck than my own. My Oct 92 80 runs 16" rims with the 1FZFE 4500 motor.

Mine seems to be a very early example of this new engine in an 80. I have spotted that some minor things are different on my old motor compared to the newer trucks some mates in our club have got.
Thus it is quite conceivable that there are other items on your truck that were changed during the life of the vehicle manufacture.

Is your truck able to run 15" wheel rims?
Are the upgrade parts you mention linked to the change to 16" rims?

Other than upping to 16" and bigger brakes, what are the other key benefits?
What are the differences in the diff and splines? I heard it's normal for the cv outer spline and hub drive flange to wear out their splines on whatever the model of 80. Mine are buggered l keep them going as l'm waiting for a front airlocker before l pull it all apart for a rebuild.

When l rebuilt the back diff last year, l replaced the cruchable spacer with a solid part. This will maintain the endfloat of the pinion shaft and is recommended.
Also for the back (not front) l replaced the std pinion bearing with a bearing for a patrol. These are much stronger but need to have a bit of machining done on the drive flange.

My front diff pinion seal was also replaced 12mth ago but is leaking again - bloody thing! I think all std 80 diffs are 4.1:1 ratio.

Cheers
BoB

AnswerID: 202999

Follow Up By: Big Woody - Saturday, Nov 04, 2006 at 18:03

Saturday, Nov 04, 2006 at 18:03
Hi Bob,

Thanks for your reply.
I forgot to mention I am already running 16" rims so the way I see it the benefits will be CV splines that have longer splines to help eliminate the backlash and bigger brakes which are an issue to me as I tow a 2500kg Trailer Sailer.
A bonus would be that I would hopefully end up with a diff that is not singing and a pinion seal that is not leaking.

Cheers,
Brett
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Reply By: 120scruiser (NSW) - Saturday, Nov 04, 2006 at 10:28

Saturday, Nov 04, 2006 at 10:28
Hi Brett
You can bolt it up no probs but bear in mind you will need a set of 16 inch rims and if you want to get genuine toyota steel rims, best of luck or be prepared to fork out lots of cash second hand. The 16x8 steel rims are very hard to get.
Anything from about October 1992 will have the bigger brakes on the front.
Anything with a 4.5 petrol engine is a good guide.
They do cost heaps to do up properly. Estimate around the $2500.00 to do a full reco on your current one.
Best of luck
120scruiser
AnswerID: 203012

Follow Up By: Member - DOZER- Saturday, Nov 04, 2006 at 12:42

Saturday, Nov 04, 2006 at 12:42
Gday
If you change rear brakes, you need the 16's, but changing the fronts only you can use the 15's...ive done this before and it is a worthwhile adventure...the diffs to the swivels are thesame, you will only need the disc backing plate, disc and calliper each side....and later longer c/v with later longer drive plates if you need them replaced, as toyota fixed another problem by lengthening them to stop the splines flogging out....again all fits if you buy the c/v and drive plate together...if you have part time, then the short c/v is the proper size for the free wheeling hubs.
Andrew
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Follow Up By: Big Woody - Saturday, Nov 04, 2006 at 18:07

Saturday, Nov 04, 2006 at 18:07
Thanks for your reply 120scruiser,

I forgot to mention that I am already running 16" rims so going the bigger brakes should be no problem. My back brakes are disks anyway and seem to work fine.
I realise the whole project will cost a bit but it is a good old truck and got a lot of miles left in it yet so it is worth spending a bit every now and then.
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Reply By: Member - DOZER- Saturday, Nov 04, 2006 at 13:04

Saturday, Nov 04, 2006 at 13:04
Brett
Couple of other things....a wrecker will want big dollars for a whole diff...just the centre is worth 3-500 to them. It sounds like you are in need of new bearings through the diff, if you want to keep the cruiser, and if you wouldnt mind getting further with less impact on mother nature...and as a bonus, minimise the possibility of breaking front diff teeth (quite a common problem when you need to reverse on sand or out of a bog) get an ARB air locker installed when you have the diff rebuilt.
Lastly, the brakes can be done at a later date with minimal effort, but the centre and c/v's are a major job....so i would aim at doing that first if money is an issue.
Andrew
AnswerID: 203031

Follow Up By: Big Woody - Saturday, Nov 04, 2006 at 18:17

Saturday, Nov 04, 2006 at 18:17
Thanks for your reply Dozer,

I read all of your posts with interest as you seem to have a very good knowledge of Landcruisers.
I will be keeping the car for a while yet as I love it and would have to spend $30K+ to get something that would be considered a step up.
I am already running 16" rims so the upgrade to a full later model front end should give me all of the benefits of the improvements Toyota made by '94, all in the one hit.
I have been thinking along the lines of an Airlocker for a while but I do not know much about them. Can you tell me how the Airlocker can help eliminate breaking teeth of the front diff? Also what is replaced from the original when you fit an Airlocker and what remains? Is the crown wheel & pinion replaced?

Regards,
Brett
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Follow Up By: Member - DOZER- Saturday, Nov 04, 2006 at 23:04

Saturday, Nov 04, 2006 at 23:04
The centre part is replaced, and your ring and pinion retained. The new centre is a solid sphere of steel, as opposed to a casting with two large holes in it as you have now...it is where these holes are that the teeth have the least strength to resist spreading.
So, with an install, they will renew carrier bearings if needed, and it is only a small job from there to replace pinion bearing and seal....
Also with the axles already out, a pair of new c/v's can be installed with minimal fuss....so in essence, you may be able to get the whole job done for under $2000 at the local ARB outlet.
Your early diff housing is better set up caster wise to run aftermarket suspension, so retaining it and using the bigger brakes is best practice.
Andrew
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FollowupID: 462662

Follow Up By: Big Woody - Saturday, Nov 04, 2006 at 23:18

Saturday, Nov 04, 2006 at 23:18
Thanks Andrew,
That sounds like the best plan of action. I will see ARB this week and get them to give me a quote.
Is it also worth looking into the new TJM locker too or just stick with the ARB airlocker?

regards,
Brett

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FollowupID: 462664

Follow Up By: Member - DOZER- Sunday, Nov 05, 2006 at 12:19

Sunday, Nov 05, 2006 at 12:19
Im not up on the TJM, but if it a auto locker, they are no good for steering on roads...if you have a constant 4wd, the only locker you can use up front is one that can be controlled on and off...the ARB is a complete centre, some of the autos are replacement side gears, and retain thesame weak carrier.
With the ARB you get a compresser aswell.
Andrew
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FollowupID: 462745

Follow Up By: Beast of Bodmin - Tuesday, Nov 07, 2006 at 08:53

Tuesday, Nov 07, 2006 at 08:53
Hi Andrew / Brett,
Keeping to the 16" rims and big brakes theme.
Is the implication that if the vehicle is fitted with 16" rims, it will already have the larger front disc brakes?
My 80 is a 92 and has 16's and 4 piston front calipers with ventilated discs.
'94 has been mentioned regarding a change to bigger brakes. What are the two diameters?

Re TJM locker - These are true air locking difflocks. Currently only the rear is available for an 80 as far as l'm aware. I have one and have been waiting for the front to become available. They are a licensed copy of the Jack McNamara unit and very rugged. People in the know suggest they are better (stonger) than the ARB unit. Certainly they dont suffer from the oil in airline, bolts loosening etc threads l have read on here.
The ARB unit is also a copy with some changes to it of a previous brand. I've forgotten the donor brand tho.

Cheers
Gekini
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FollowupID: 463054

Follow Up By: Member - DOZER- Tuesday, Nov 07, 2006 at 14:33

Tuesday, Nov 07, 2006 at 14:33
Gekini
1992 was the year they changed to the larger brakes, early had vented, 4 piston aswell, but a lot smaller. If your build date is after 9/92 you have the larger, and it seems quite possible with 16 inch rims on it...a quick way to find out is to measure the thickness of the disc...early are 25mm new, later are 32mm new. www.dba.com.au have all the listings http://www.dba.com.au/dba_catalogue_2004/HTML/AUST2006_PDF/TOYOTA_AUST_06.pdf
Basically, Toyot used thesame hub, but enlaged the disc, and put longer feet on the calliper that retained thesame pistons..so it bolts up to thesame swivel. Backing plate is also larger to suit.
Another mod that helps breaking on the larger discs is to use 100 series pads that are rectangle in profile of the pad surface as opposed to the 80 series tapered off towards the middle profile.
All thesame can be said for the rear brakes aswell, but because the fronts do 70% of the work, running large on the front only gives a large improvement, and you can still fit the 15 inch rims around them.
Thats not to say you shouldnt change the rear aswell, just that it is an option not to...
Andrew
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FollowupID: 463108

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