Aluminum trailing arms and rear Aluminum S Calipers?

[SY1970911S]

Good afternoon,

I have a 1970 911S and am in the middle of a suspension upgrade. Part of the upgrade is swapping the steel trailing arms for Aluminum (MY 74-86 I believe). Will my aluminum S rear calipers fit on the new Aluminum trailing arms or do I need to purchase steel M calipers? I tried fitting them last night and it doesn't look like a perfect swap. (The search's I've tried do not speak directly to caliper fitment)



Any help would be greatly appreciated.

Gregg

[budge96]

The calipers should fit unless the swing arms are Carrera then the rotor will be a smidge larger,M calipers should answer that...Bert

[M_deJong]

Ummm, your '70 911S should have cast iron M calipers on the rear...

See these posts for info on the shock clearance:

http://www.early911sregistry.org/for...arm+conversion

http://www.early911sregistry.org/for...arm+conversion

[SY1970911S]

Ummm, your '70 911S should have cast iron M calipers on the rear...

See these posts for info on the shock clearance:

http://www.early911sregistry.org/for...arm+conversion

http://www.early911sregistry.org/for...arm+conversion

You are correct, I apologize for my oversight. I have read the other posts you provided but I don't see reference to the type of caliper used. I wonder if I just don't have something else fit quite right.

Thank you for the reply.

[M_deJong]

Sorry those didn't help with the caliper. What is the disc off of? I think the early rear vented rotor had a different backspace... The ones used with widened L calipers. Would be odd if you had one of those... Or there is something strange in your hub mounting?

[SY1970911S]

Through my local mechanic I was able to find other customer that is done the same swap. He says that the M steel rear calipers will not fit on the aluminum trailing arms. The car that he worked on previously swapped the front aluminum calipers to the rear and then they used a different aftermarket caliper for the new fronts plus new thicker rotors. I hadn't quite planned on all of that because it wasn't mentioned in the threads that I've read on the Internet. I thought it would be an easy swap with the existing calipers front and rear. Bummer.

[johntyboy]

Hi
You may find you have issues with shock absorber clearance. 2.2 steel arms have the shock mount further forward than steel 2.4 and aluminium arms. The shock turrets were changed on these later shells to allow clearance for the shock.

Kind regards.

[EA911]

Isn't the rear caliper on an S car steel and not Aluminum?

[Longballa]

You can run your rear shock without the dust cover and the shock will work fine. S front calipers are aluminum. Are you saying that your rear calipers are aluminum?

[johntyboy]

You can run your rear shock without the dust cover and the shock will work fine.

Not on my shell. Even with the dust covers removed the shock still rubbed on the turret but different shells may have slight difference in turrets so you may be fine.

Kind regards.