Rear Subframe Arm Conundrum

[dasadrew]

As avid readers of my Stag resto thread might know, my sandblasters lost my subframe arms. Fortunately I had stripped all of the brackets, bolts, shims etc. off before they went to be blasted. I managed to buy one brand new old stock arm and get a good used one from Martin @ justriumph.

Am just fitting them and see that:

a) my new arm has an additional hole (the one with red oxide primer in it) just by the exhaust passageway

b) my small brackets (black one in pic) are different to the one that came with the used arm from Martin (rusty one in pic)

Any ideas? Is this stuff a pick 'n mix from a Triumph 2000 and Stag? or what?

Cheers

Drew

IMG_2855 (Custom).JPG

IMG_2856 (Custom).JPG

[stag157.7]

As avid readers of my Stag resto thread might know, my sandblasters lost my subframe arms. Fortunately I had stripped all of the brackets, bolts, shims etc. off before they went to be blasted. I managed to buy one brand new old stock arm and get a good used one from Martin @ justriumph.

Am just fitting them and see that:

a) my new arm has an additional hole (the one with red oxide primer in it) just by the exhaust passageway

b) my small brackets (black one in pic) are different to the one that came with the used arm from Martin (rusty one in pic)

Any ideas? Is this stuff a pick 'n mix from a Triumph 2000 and Stag? or what?

Cheers

Drew

[ATTACH=CONFIG]11134[/ATTACH]

[ATTACH=CONFIG]11135[/ATTACH]

straight bracket is mk i stag
sloping bracket is mk 2 which gives more negative camber

you need a matched pair

alan,

[dasadrew]

Thanks for the quick reply. So at least we're just dealing with Stag brackets and not ones off another model.

Hmmmmm....

the originals off my '74 Stag Mk2 (I'm presuming they were original!) are the "straight" black ones in the pic (I fortunately have a matched pair!).

Wouldn't the sloping bracket give more positive camber?

Drew

[tonypy1]

My advice would be speak to Chris Witor, I rebuilt my rear suspension with the lowered springs and camber compensating brackets that are actually supplied to Stag dealers by Chris. I was rather dissapointed to find that after fitting the rear subframe assembly back into the car that I had way to much positive camber after speaking to Chris he recxommended that for a late mark 2 Stag and this set up I needed a set of pre-face lift Triumph 2000 style brackets. He will have the right type for whatever set up you are going for and there's a section on his website where you can compare the different types:

http://www.chriswitor.com/products.php?cat=335&pg=4

[Andrew S]

Hi Drew, no your MK2 would be the non painted bracket. Both brackets on a MK2 sloped downwards. This pulls the trailing arms down more and then causes more negative camber.

See this for further help. As you know, I have and am going through all this with mine so have found these things out.

http://www.chriswitor.com/cw_technic...variations.pdf

Cheers
Andrew

[dasadrew]

OK guys, I am beginning to understand. I didn't realise there is also a sloped inner bracket too. Just sloping the outer alone would have caused less negative camber.

Infuriating that the commission numbers on this document aren't readable, as the exact changeover from normal to sloped would be clear:

http://www.triumphstag.net/start/technical/partslist/diagrams.php?diag=02-48&part=138634&desc=BRACKET+SUPPORT

The Chris Witor site http://www.chriswitor.com/datasheets...20shackles.pdf says that early pre-1974 Mk2's (2000? Stag? Both?) had the Mk1 brackets. My Stag is Feb 1974, so maybe it just snuck out of the factory with the pre-1974 straight brackets.

All interesting stuff; I never realised there were two types of shackles. I guess all I can do at the moment is to pop the original ones onto the new trailing arms and see how it finally looks like.

At least it doesn't look like the arms themselves vary, so that allays my fear that I would be constructing a Frankenstag!

Thanks

Drew

[tonypy1]

When fitting the trailing arms back on leave the bolts securing one of the brackets loose, I can't remember which one but there's one that you'll be able to get a spanner on once the trailing arm is in place - I think it is the inner. This will allow a bit of twist and will make the job of pushing the trailing arms home so much easier.

[dasadrew]

When fitting the trailing arms back on leave the bolts securing one of the brackets loose, I can't remember which one but there's one that you'll be able to get a spanner on once the trailing arm is in place - I think it is the inner. This will allow a bit of twist and will make the job of pushing the trailing arms home so much easier.

Thanks. Sounds like a good move!

[Andrew S]

Yes, Drew, thats good advice by Tony and I found you can get to both of the bracket to tighten up, so you can keep them both loose.

[StagnJag]

When I put the brackets back on my arms I passed a straight rod through both brackets to check the alignment and they were way off so worth checking that too so they can pivot correctly.

Rgds

Dave

[dasadrew]

Assuming the trailing arm eyes are in perfect alignment!!