rear suspension noise over tar strips

[winter.k]

Search using the TRW part numbers that Smallblock provided.




Amazon also confirms this for the 986/TRW JTC1186 part:

[Pdwight]

That is a really good price, I am replacing both mine this winter

BTW I have been told the 987 is an exact fit and much tougher for our 986 cars

[steved0x]

Originally Posted by winter.k

Smallblock,

Thanks for the equivalent part numbers from TRW. These are $110 (986) and $125 (987) on Amazon with free prime shipping.

I guess everybody is getting these as both part numbers are out of stock now...

[winter.k]

I noticed they were out of stock, once I actually placed the order. I prefer amazon at that price ($122 each for TRW1316) so I don't mind waiting. I'll share once they are back in stock and ship out.

[winter.k]

Originally Posted by winter.k

I noticed they were out of stock, once I actually placed the order. I prefer amazon at that price ($122 each for TRW1316) so I don't mind waiting. I'll share once they are back in stock and ship out.

Just got shipment notification 12/10, originally purchased on 11/28.

[steved0x]

Originally Posted by Smallblock454

Hi,

for those located outside the US or not willing to buy from Pelican.

Porsche 987 part number: 98733104302 and 98733104303
is equal to TRW JTC1316, EAN number 3322937921805

Porsche 986 part number: 98633104307, 98633104306, 98633104305, 98633104304
is equal to TRW JTC1186, EAN Number 3322937753246

The 987 part seems to be a little cheaper than the 986 TRW part. Around 85 euro each.

Regards from germany
Markus

Do you have the TRW number for the front control arm? I believe it is part # 99634104306

Thanks,

Steve

[EJ-Fresno]

OK, found a video how to replace them:
https://www.youtube.com/watch?v=899_OjGjBMg

Question is: do you have to load the front suspension when you tighten them, like for the rear control arms?

[WillH]

Originally Posted by EJ-Fresno

OK, found a video how to replace them:
https://www.youtube.com/watch?v=899_OjGjBMg

Question is: do you have to load the front suspension when you tighten them, like for the rear control arms?

I can't see why. After re reading Bentley for the rear, it stated to load the rear for the control arm, not for the trailing arm. There was no reason to remove the control arm to change the trailing arm.
Don't see any reason to remove the front control arm to change the front trailing arm either. If you do remove or loosen the control arm though, then yes load the control arm before tightening it.

[jpl2407]

I got mine from parts geek

[JayG]

This may be a dumb question, but what are you referring to as "Tar Strips"

[Pnut]

Basically, they're expansion gaps evenly spaced in the roadway where a tough but pliable material (tar-based, I guess) can expand and compress with the weather conditions. They make the rhythmic double thud as first your front, then rear tires go over them at speed. The liquid tar that is used to fill in cracks as well as cold patches used on pot holes are also culprits. Infrastructure is on the out nation wide it seems.

[JayG]

Originally Posted by JayG

This may be a dumb question, but what are you referring to as "Tar Strips"

Originally Posted by Pnut

Basically, they're expansion gaps evenly spaced in the roadway where a tough but pliable material (tar-based, I guess) can expand and compress with the weather conditions. They make the rhythmic double thud as first your front, then rear tires go over them at speed. The liquid tar that is used to fill in cracks as well as cold patches used on pot holes are also culprits. Infrastructure is on the out nation wide it seems.

Thanks

That makes sense. I never heard them referred to as tar strips

[steved0x]

Ok here are some pictures of the two different track arms to try and tell the differences.

Beside the differences in the shape of the arm, maybe the monoball/bushing end of the arm has stronger internals? By hand I can't get either of the bushing ends to flex so I can't tell that way.

Here are some photos showing the differences.

From this side they have the same outline, but the 987 part has more "ridges" for lack of a better word, where the 986 part is flatter in the middle with no raised parts (and I don't have a photo of the other side so I don't know if it is the same, I will check tonight)



Here are two additional shots showing the end detail. The holes line up exactly, I got some M14 bolts to test this out and you can see them in these two photos.





This is a detail of the part numbers with some part (the triangle?) ground off.




This is a top down shot, with the 987 part on top, you can see how the curve of the arm is different, the bottom arm (986) sticks out toward the top of the picture.



This shot is with the arms turned over so the 986 arm is on top, showing the curve from the other side.



These next two show the arms side by side, the arm with the "V" sharpie looking mark is the 987 arm.





Maybe over Christmas break I will get a chance to install these and I might have more feedback then.

Steve

[Pnut]

Sooooo... the 987 part may change the rake/ride height?...

Thanks for the photos.

[steved0x]

Originally Posted by Pnut

Sooooo... the 987 part may change the rake/ride height?...

Thanks for the photos.

I don't think so, mounting hole to mounting hole they are exactly the same length. I think it would take different springs to adjust the ride height. I don't know too much about those things though...

[Pnut]

Originally Posted by steved0x

Maybe over Christmas break I will get a chance to install these and I might have more feedback then.

Steve

Did you go with the 987 part? Fit fine? Prolly hard to make a distinction between a worn factory part and a new upgraded one (to say one is better than the other if both were new).

[JayG]

the thing that was ground off is a triangle with a P in it that denotes it is a genuine Porsche part. The one you have was sold aftermarket. Same part just not from a Porsche dealer. Part or all or the Porsche part number may be removed as well.

[jakeru]

Interesting comparison pics. I wonder if there is a weight difference. It looks like the 987 arm might decrease the maximum allowable back-spacing for the rear wheel.

[Pnut]

Hoping Brad will explain why he much prefers the 987 part for the 986.

[steved0x]

Originally Posted by jakeru

Interesting comparison pics. I wonder if there is a weight difference. It looks like the 987 arm might decrease the maximum allowable back-spacing for the rear wheel.

Interesting, I will take a look and see if I can tell a difference once I have one side new (987) and one side old (986)

Now I want to run down there and see right away

Edit: I looked and I don't think so, if there is a change in clearance it is only 1 mm or so (but then I guess this could be the critical mm when fitting some wheels...)