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Al Trailing Arms
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11356
Location: PacNW

PostPosted: Fri May 02, 2008 6:50 am    Post subject: Al Trailing Arms Reply with quote

Considering this swap for Shaggy. Worthwhile? Any pitfalls?
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morghen  



Joined: 21 Jan 2005
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PostPosted: Fri May 02, 2008 6:57 am    Post subject: Reply with quote

i've done it on my car mainly because i needed more offset but they are lighter...also some wheels wont fit anymore...but some other wheels will fit with no spacers...so it changes stuff...but not in a radical way.

anyways...if you change the arms you will have to change the spring plates...wich means everything comes down...and you have to mess with the torsion bar index to get it right.
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ideola  



Joined: 01 Oct 2004
Posts: 15509
Location: Woodstock IL

PostPosted: Fri May 02, 2008 8:28 am    Post subject: Reply with quote

Definitely worth it in the weight savings department. I had no problem picking up and moving around an entire 944 rear suspension assembly, but I could not pick the 931 five lug steel setup I pulled off of one of my donors earlier this week. IMO, if you're going to go to the trouble to upgrade your bushings and stuff, you might as well swap it out.
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fiat22turbo  



Joined: 18 Jan 2006
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PostPosted: Fri May 02, 2008 8:31 am    Post subject: Reply with quote

They are beautiful castings. I've got a set (sans the hard lines, sigh) that I was thinking of putting on mine. That reminds me, I need to measure the offset of my wheels to see if I need spacers, etc.
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Rasta Monsta  



Joined: 12 Jul 2006
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PostPosted: Fri May 02, 2008 9:30 am    Post subject: Reply with quote

Hmm, bummer about those spring plates, tho.
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ideola  



Joined: 01 Oct 2004
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PostPosted: Fri May 02, 2008 10:56 am    Post subject: Reply with quote

Why? They're not hard to remove and you have to take them off anyway to install those 30mm welties Should be a dime a dozen too if you don't have a set already. But the alu spring plates are definitely different than the steel ones...
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Rasta Monsta  



Joined: 12 Jul 2006
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PostPosted: Fri May 02, 2008 11:33 am    Post subject: Reply with quote

Yeah, just something else to "acquire."
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fiat22turbo  



Joined: 18 Jan 2006
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PostPosted: Fri May 02, 2008 12:39 pm    Post subject: Reply with quote

Eh, they usually come with the arms. There are a number of people on Craigslist parting 944's quite often.
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Raceboy  



Joined: 01 Mar 2004
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PostPosted: Sat May 03, 2008 5:25 am    Post subject: Reply with quote

It's one of the best upgrades I've done to my cars. Nice, more rigid and lighter, what else would you want.
But only the rears as I don't like the front alloy arm achilleus heel: the ball joint
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Rasta Monsta  



Joined: 12 Jul 2006
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PostPosted: Wed May 07, 2008 2:26 am    Post subject: Reply with quote

After looking through the PET a bit, it appears that swapping stub axles and hubs will also be required.

Agreed?
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ideola  



Joined: 01 Oct 2004
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PostPosted: Wed May 07, 2008 2:42 am    Post subject: Reply with quote

Yes, you will need the entire rear trailing arm assembly including the hub/stub that is on the trailing arm side, as well as the spring plates. You may or may not also need the calipers and parking brake assembly depending on what you are installing onto. If you're doing a 4- to 5-lug swap you definitely will need these items. If you're just swapping out trailing arms on an existing 931 steel setup, you probably don't.
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-nick  



Joined: 16 Nov 2002
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PostPosted: Wed May 07, 2008 4:49 am    Post subject: Reply with quote

Don't forget that the shock mount on the arms is a different diameter, you'll need the longer axles, you'll need the alloy arm parking brake shoes/springs/guts, and I believe the parking brake cable is different too.

Basically, change everything except the torsion bar carrier housing (which you only need because of the G31 trans mounts), brake calipers and discs.
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ideola  



Joined: 01 Oct 2004
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PostPosted: Wed May 07, 2008 5:02 am    Post subject: Reply with quote

I believe the parking brake cable ends are the same for all 5-lug. I believe the axle length is the same on pre-87 NA 944s, but different on 951s and post-87.

But yes, to make things simple, it should be no problem to source a complete 944 rear torsion carrier assembly, and simply swap out the carrier itself (due to your snailshell), particularly since you have those 30mm torsion bars to install.
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-nick  



Joined: 16 Nov 2002
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PostPosted: Wed May 07, 2008 5:14 am    Post subject: Reply with quote

I think it's the length of the parking brake cable that is different. Going from memory on that though.

Axles are definitely longer. Alloy arms (aka late offset arms) move the hubs ~21mm further out which means you need ~21mm more axle to reach them.

Either way, the shocks are the non-bolt in part. The top mount will be one diameter and the bottom mount another. You can make up a sleeve or maybe press in different bushings etc. Still a pain.
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1980 931S
15psi boost, MS-II, EDIS, 951 IC, custom intake, Ford 5.0L throttle body, Forge BOV, WB o2, G31 w/LSD, 964 wheels, 968 rear sway, Bilsteins, 200# Welt. springs. A laptop, and a partridge in a pear tree.
1991 964 C4 Cabriolet
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ideola  



Joined: 01 Oct 2004
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Location: Woodstock IL

PostPosted: Wed May 07, 2008 5:24 am    Post subject: Reply with quote

Ahhh...excellent clarification Nick, Thx.

Regarding the shocks, I didn't recall that difference, but now that you mention it, I do seem to remember a few threads around that discussed an easy way to make sleeves...prob'ly worth a search...

Thx!
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