75 series coil conversion question

[crozza]

I notice that when people want to fit coils to there 75ers they replace them with 80 series diffs and weld up all the essential mounting hardware.

My simple question is, can you simply use the existing 75 diff as is in the car and then weld up all the necessary brackets, spring cups, arm mounts and the like to the original diff?

Any help would / ideas would be appreciated
Cheers

[pinkfloyddsotm]

yer you could but it's just more cutting and grinding thats unnessecary plus you wouldnt get the extra wheel track if you chuck an 80 dff under all your really cutting is the coil tophat but it needs to be broadened out.

[vk7ybi]

Anything is possible with a welder and grinder and skills, if no skills then time and money should do it..

[crozza]

I got plenty of welders..big ones , small ones and all the gear...
Might think about doing it one day.

[vk7ybi]

For someone with skills and equipment, there is no good reason to not use whats already in there..

[dogbreath_48]

I understand it can be difficult to fit springs between tyres and chassis on the front (what with the narrower track of the 75 axle)

[crozza]

Yeah you could be right there.... Will have to do some measurements.

[Thommo 73]

im almost thur doing the front on mine, there is just enough between the wheel and chassis for the coils, even more if you use coilovers.

not an easy thing to undertake, and the biggest limiting part is the fact you still have your drag link and tie rod in fron of the diff which gets in the way of the panhard/bracket which limits the up travel you will have,
that said im still going to have 130mm+ which is plenty for what i need.

and a lot of grinding!

oh and if your using raduis arms where they mount to the chassis is where the GB x-member is

[crozza]

Slap some pics on 4 me .

[tiler0172]

the problem with the 80 diff is it runs the little diff same as the late 75 diff i have done the conversion into my comp ute i used 60 diff and put longfeilds into it but you then have a 75mm wider track and you can get full lock on the steering .then get all the mount of a 78 ute so it all fits spot on
cheers
crazy eyes

[dogbreath_48]

the problem with the 80 diff is it runs the little diff same as the late 75 diff i have done the conversion into my comp ute i used 60 diff and put longfeilds into it but you then have a 75mm wider track and you can get full lock on the steering .then get all the mount of a 78 ute so it all fits spot on
cheers
crazy eyes

Did you have any problems mounting trialling arms to the axle - pumpkin clearance? I'd like to go down the 60-axle path eventually, as i've spent plenty of $$'s on components to suit.

[tiler0172]

nope it took some working out but it fits nice and works great it is tight but it has been in there for the last 3 xwc and it hasnt broken with a 4.5 turbo petrol driving it.
cheers
crazy eyes

[balzackracing]

If you want to keep your orignal diff housings why not just convert to coil over??

[thrashlux]

The best combination would be a hybrid
big old diff center with 80 series housing (better brakes cvs and wider track)

has anybody done this
might be worth making up a jig so a early pumpkin can be fitted to a 80 series housing?


it has been an idea in my head for a while

i have an 80series size front diff (small one hi pinion style) with an arb airlocker and aftermarket diff gears and had no problems if i ever break it then i will think about it
i run standard 80 series cv's and keep snapping free wheeling hubs not cv's or diff centers

what i do know is the standard cvs (longfeilds excluded) in the early models would break a long time before an 80 series front diff center

you really have to pick your evil do you want a hilux sized diff or do you want hilux sized set of cv's

[dogbreath_48]

The best combination would be a hybrid
big old diff center with 80 series housing (better brakes cvs and wider track)

has anybody done this
might be worth making up a jig so a early pumpkin can be fitted to a 80 series housing?


it has been an idea in my head for a while

i have an 80series size front diff (small one hi pinion style) with an arb airlocker and aftermarket diff gears and had no problems if i ever break it then i will think about it
i run standard 80 series cv's and keep snapping free wheeling hubs not cv's or diff centers

what i do know is the standard cvs (longfeilds excluded) in the early models would break a long time before an 80 series front diff center

you really have to pick your evil do you want a hilux sized diff or do you want hilux sized set of cv's

GQ center in 80s housing is a reasonably common conversion.

[Thommo 73]

photos arnt my thing, but as for the early diff intop the 80 housing it wont work, drag link goes behind the diff and the reason for the HP diff is to clear the steering stuff,im more than happy to be proven wrong but ive spent alot of time measuring. i did look into the 60 diff but didnt have a housing laying around to find out.

and you can get full lock with the 75 housing. and as i said earlier the biggest problem to over come is if your using radius arms and where they mount to the chassis. i have seen (on here somewhere) someone using custom made alloy ones(longer than standard) which would over come the prob

best way to know what to do is get out into the shed and measure, i spent ages reading and asking q's and in the end none of it helped. just gave me the drive to do it and stop asking questions

[thrashlux]

Yeh I had thought about the steering issues i was going to make up a hi steer set up

the other thing was the drive shaft angle would not be as nice

So i will be waiting for a diff failure before i do anything might never happen

plenty of other things to do first

[Thommo 73]

cut n turn to change diff angles, and im not sure hi steer would clear it