924Board.org

[Kenodog]

Just wondering if a 951 torsion bar carrier will bolt into a series 1 931 ?
If it wont then will the trailing arms just bolt up to the 931 torsion bar carrier then I swap the 931 bars out and put the 951 bars in ?

tia,Leigh
_________________
1979 Euro 931, Olive
1981 931, Sabine
1991 Ford Ranger XLT 4x4, Ricky
1996 Ford E-350 ex-FedEx Van
2014 Mazda CX-5 (Kinderwagon)
2019 KTM 790 Adventure
2024 KLX300
2024 KLX140

[morghen]

the 951 carrier will fit..so will the trailing arms.
but in case you have a snailshell, you wont have any support for the gearbox.
_________________
Supercharger and EFI kits
https://www.the924.com

[Kenodog]

Cool,thanks Morghen. We will probably be using a 924S transmission so that's not a problem. I was just worried that a 951 carrier was wider than a 931 carrier.
_________________
1979 Euro 931, Olive
1981 931, Sabine
1991 Ford Ranger XLT 4x4, Ricky
1996 Ford E-350 ex-FedEx Van
2014 Mazda CX-5 (Kinderwagon)
2019 KTM 790 Adventure
2024 KLX300
2024 KLX140

[ideola]

The torsion carrier will bolt in, there is no difference in terms of the width, as the offset is determined by the trailing arms, not the torsion carrier itself. However, the 951 spring plates will not work with the steel trailing arms, as they have a different bolting arrangement and geometry where the trailing arm bolts to the spring plate.

You will also not be able to use the late offset 1987-onward 951 trailing arms as they will push the wheels out too wide for the narrow body 931. Consequently, you will either need to swap in the steel trailing arms with their matching spring plates, or you will need to source 924S or 1986 ONLY 951 alu trailing arms, which have the correct early offset. Note that these early offset alu trailing arms also eliminate the need for the 22mm spacer used on the 931 steel trailing arm setup.

If you choose to keep the steel trailing arms, which will require disassembling the spring plates from the torsion carrier, you will need to make sure you maintain the correct indexing of the torsion bars, as the spring plates are how the outer ends of the torsion bars are held in place, i.e. indexed. This is a good time to consider swapping in stiffer torsion bars and reindexing them for a lower ride height.

On the other hand, if you intend to swap over to 924S alu trailing arms, you will NOT need to mess with the spring plates or torsion bars, but you WILL need to convert over to the later style rear shocks, as the lower shock mounts affix to the trailing arms differently.
_________________
erstwhile owner of just about every 924 variant ever made

[Kenodog]

I am picking up a complete '86 951 rear assembly. TBC,trailing arms,etc. Also a full set of Brembo calipers from a 968. I would ideally just like to swap the entire unit right into the 931. The torsion bars in a 951 are heavier than those in a 931,no ?
_________________
1979 Euro 931, Olive
1981 931, Sabine
1991 Ford Ranger XLT 4x4, Ricky
1996 Ford E-350 ex-FedEx Van
2014 Mazda CX-5 (Kinderwagon)
2019 KTM 790 Adventure
2024 KLX300
2024 KLX140

[Kenodog]

Shoot,that sucks the rear shocks are different,we just bought a full set of Bilsteins. . .
_________________
1979 Euro 931, Olive
1981 931, Sabine
1991 Ford Ranger XLT 4x4, Ricky
1996 Ford E-350 ex-FedEx Van
2014 Mazda CX-5 (Kinderwagon)
2019 KTM 790 Adventure
2024 KLX300
2024 KLX140

[morghen]

i'm guessing you're going for the "easy" job...just drop the old one, and up with the new one for stiffer back end...if so..take care on what wheels you want to use...like Dan said...there are some things to consider.

[Kenodog]

Ah shit i have just been informed the setup is from an '86. Dammit. Anyone have some 924S trailing arms they dont need ?
_________________
1979 Euro 931, Olive
1981 931, Sabine
1991 Ford Ranger XLT 4x4, Ricky
1996 Ford E-350 ex-FedEx Van
2014 Mazda CX-5 (Kinderwagon)
2019 KTM 790 Adventure
2024 KLX300
2024 KLX140

[fiat22turbo]

Swap the hubs on the arms. That is where the offset change was on my aluminum trailing arms. I put early offset hubs onto my late offset arms and all is well. I don't remember if they were 951 arms or not, but they were produced in 88 I believe.

Rennline makes a set of shock bolt adapters to use early shocks with later arms. Or you could bore the bottom bushing out on the shocks to fit the larger bolts (which is what I did)
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

[ideola]

The 86 951 trailing arms should be fine, as the 86 model was the ONLY 951 that used the early offset. It has the unique early offset front alu a-arms that have the same offset as the steel a-arms on our 924/931; the rear trailing arms are the same part as used on the 924S. In 87, the standard 944 and the 951 were both changed over to the late offset alu trailing arms; the early offset alu trailing arms from the 86 951 were migrated to the 924S because it required maintaining the narrower track, although interestingly, the 924S did not get the alu a-arms up front, even though they would be pretty much direct bolt-on.

As for the shocks, it may be possible to rebush the lower mounts of the billies you just bought, but I'm not positive on this. The key difference is that the alu arms use a stud that threads into a blind hole on the trailing arm, with a outward facing stud to which the shock is then fastened; whereas the steel trailing arms have a large bolt+nut that passes through a steel box in order to fasten the lower shock mount. I may not be recalling correctly, but I believe the I.D. of the alu-arm lower shock mounts is smaller than that used on the steel-based setup, so you may be able to simply re-bush it. If it's the opposite, you'll have to bore it out...or just trade in for the correct parts. If you take a look at the respective PET files for the 931 and the 924S, it should specify the size of the bolts.

For reference, I am running early offset alu a-arms and trailing arms on my Club Sport project. I spindles from a 968 and some aftermarket Sachs (i.e. NOT OEM replacement) strut housings, the combination of which allows me to run the 968 Brembos. The early offset a-arms are from an 86 951, and the early offset trailing arms are from a 924S.
_________________
erstwhile owner of just about every 924 variant ever made

[ideola]

[morghen]

what wheels do you want to use?
_________________
Supercharger and EFI kits
https://www.the924.com

[ideola]

[fiat22turbo]

[morghen]