Trailing Arm Variation?
 

Trailing Arm variations:

I am trying to buy/find a replacement right-rear trailing arm because the shock mount threads do not have good integrity. When I removed the bolt, it appeared to have some aluminum embedded in the bolt threads. I purchased some Koni 30 coil overs and removed the torsion axles. The Koni mounting stud requires a torque of 150 ft.lbs. and I seriously doubt the thread integrity will hold this. Since I have nothing to lose at this point, I am going to line the entire shock mounting hole with JB weld and re-tap it. I have had success using this method in prior experiences in my life, so we will see.

My question to the Pelican community is these trailing arms have many variation numbers and I am wondering if someone has any documentation listing the different variations that would be a direct fit on an S2…. The number that is on my right-rear trailing arm is 951.331.514.05 and do I need to find this exact number? Will any 951 or early 968 trailing arm work on a S2 and if so, what are some of the other trailing arm variation numbers that will work?

Does anyone have a good right-rear trailing arm for sale ?

If you have ABS (944S2 came standard with ABS) then you will need an arm with mounting and hole for ABS. The number on your trailing arm is the casting number and does not necessarily need to match.

If you don't need/have ABS, any good aluminum trailing arm will do.

Thank you! I guess that makes sense that any ABS arm should work…now I need to find one that is in good shape.

Why not put a thread insert into it?

Do you know of anyone who has successfully done that? I would certainly consider doing that if its possible.

Wouldn’t the hole have to be enlarged to accommodate an insert. At that point would there be enough material on the trailing arm to maintain structural integrity?

With a torsion bar delete, that lower mount is the only thing taking the weight of the suspension load. Its certainly not something I would trust to JB weld. The safety implications are serious, and its why you need to have a coilover kit designed specifically for torsion bar delete (solid metal bushings on your shocks, and the lower bolt with reinforced shoulder - aka Racers Edge/Intraxx). I assume the OP is running this kit (which is designed for TB delete)

A timesert/helicoil might be possible - yes you need to enlarge the hole (just slightly to accommodate the next thread size up).

The most ideal solution is to get a used trailing arm. I see these are on ebay for $200, but you might find it cheaper through plyhammers or others (944 Ecology?).

Thanks for the input and I am considering all options.. I have see some trailing arms on eBay that I might end up buying, but it looks like ones that I have seen are from East Coast cars that have corrosion on them. I was hoping find someone on this forum that has one that is in good shape to sell me.

In Aerospace any time we have a steel bolt go into an aluminum casting of any kind a helicoil is used. so yes its possible and sucessful.
however if you dont feel comfortable doing it thats another thing.
any skilled machine shop should be able to do it for you but that would mean pulling the arm off the car.

I would shoot an email over to Plyhammers, 944 Ecology or Just Joshin and see what they got - likely cheaper than ebay. George (944 Ecology) is super helpful and active on these forums so I would ask him first!