Red Motor Rear End That Will Bolt Into EK Sedan Brisbane

[DeadSled]

It has no plate for bolt holes. I've read on here before that a HR diff is a straight bolt in job, so how would that be possible if it was bolted in and not held in with U bolts?

[DeadSled]

Just remembered i have a pic of the diff..

[wot179]

That looks damn cool,but its not a standard HR housing.

Ill get some pics for you.

[DeadSled]

I've knocked off the bump stop mounts, but aside from that..

What is not standard Hr about it? I had a look then at my EK diff and this one and their exactly the same as far as mountings go, it just has the one pad on each end and thats it. Will this diff work or not? I got the diff from my mates Dad who owns Harrisons Holden and &*#@ and he said it was a HR, and he'd know of all people i'd think.

I need help

Edit: Is there any chance that someone has just cut the bolt plate thingy off to fit it to an earlier Holden at some stage? I've never done this swap so i don't know really

[wot179]

HR diff housing

HR spring saddle

They go together like this around the spring,and held together with nuts and bolts(though Ive had a couple of HDs that used ubolts instead)

You can see the shock mount on the saddle as well.


And here is a HR axle with the bearing and bearing retainer still attached. Theres a paper gasket in there too.


I hope that clears a few things up for you.

[DeadSled]

I see. So if a HD diff uses U bolts then could mine be a HD diff instead? It has similar mounting pads to my EK one, very similar. My axles look the same as those as well, i have all those bits.

Since mine has almost the same pads as the EK, couldn't i just use all my original EK saddle pads holder things and the shock mount plate and just bolt it up exactly like the EK diff was?

My other query is that the HR or whatever wheel bearing fits fine in the diff housing but won't go through the HQ backing plate. If i was to press in the bearing into the housing with the oil seal and collar inside, could i then bolt the backing plate on and just slide the axle into the housing?

[wot179]

One other thing,you cant have much meat left on the edge of your axles if you have gone to HQ pattern.

Ive owned around 15 HDs and HRs.I know a little about them,too.

You should be able to use your housing if you use ubolts.

[wot179]

HD diffs look the same on the mounting plates as HR,but they used ubolts.They went a different way with HRs,and just used nuts and bolts.

Dunno why,probably cheaper.

[DeadSled]

There is still a decent amount of meat left between the stud and the edge of the axle flange. Theres no way it'd ever crack or break out or anything like that.

I was planning on using the u bolts as per factory, i didn't know there was any other way to be honest haha.

Am i right with the way the seal collar and wheel bearing goes into the housing?

I appreciate the help mate, this has been doing my head in the last few days!

Edit: Just saw your second post, do you know what my diff would be out of then? If not a HD or HR? It had a few marks that looked like grinding marks on it though which makes me wonder if someone has had it in an early holden in its previous life, and welded on an earlier pad perhaps? What do you think mate?

[wot179]

You cant fit a bearing the way you suggest.

I would be filing the center hole in the backing plate out.

Bear in mind,I have never personally fitted HQ brakes to a HR housing.

The pads could easily have been fabricated and welded on.

I was cleaning a diff up today to paint it,and the original housing is a turd to prep around the original mount,so I would understand if it was cut off and changed to get nice paint on it.

Wicked gold flake,by the way.

[DeadSled]

Okay I will die grind or file the backing plate to suit tomorrow then.

The diff was actually a sky blue and had a bright yellow underneath that so perhaps your right and that's why it was changed. It had the same bump stop mounts as a ht diff has though.

Are the bearings hand fitted to the axle then? Or is a press required? They seemed very tight in the housing so I'm unsure how much force is required to seat them into the end of the housing.

[wot179]

You will need a press.

Note the locking rings as well.

Something I have been caught out with is axle seals.

HR and HT look the same but one is marginally thicker than the other,which results in oil pissing out everywhere.

Double check that you have the right ones.Ive been told by spare parts guys they are the same part,this is not true.

The axles when fitted with new bearings should slip straight in with a bit of oil on them,if they don't,you have a problem.

[roto]

Looks like a EH housing to me and from memory you have to file or machine the HQ backing plate centres to fit the earlier type wheel bearings as they are a bigger outside diameter than the HQ tapered roller bearings.As wot179 said bearings and retainers have to be pressed onto the axle before fitting to the housing.
roto

[DeadSled]

Wot179,

We bought a press today So will be able to press the bearings and stuff on i guess tomorrow arvo. My old man cleaned out the ends of the housing where the bearings will sit, reckoned it had a bit of a liner of rust there but its all nice and shiney and smooth now so the bearing should slip in nice now.

Also spent the arvo die grinding the backing plates, still got one more but the bearing slides through one now so that'll be that problem sorted.

Roto,

Thanks for that info mate. It just confirmed that i'd have to grind out the backing plate to make the bearing fit through it. Should be on track now