Got a knocking noise. any advice?

Put the lower control arms on, me an hector did everything right from what hector says. but yeah heres what happens

When the clutch engages i hear a knock, only 1 knock per shift, mainly does it downshifting, but it doesnt do it all the time.

any advice as to what it is? is it normal? a way to fix it? could it hurt something if the knocking still persists?

a knock like metal on metal? like the car may be bottoming out on something?

Sounds like you might need to re-torque the lca bolts. Also, depending on the type of bushings in them, they may just be noisier than your stock ones.

there polyurethane bushings

Then they shouldn't really be any louder than stock. Might want to check the torque on those LCA's.

it doesnt sound like metal sounding,
dunno if you know what this sound like but it sounds like the rear differential is hitting up underneath the car.
i highly doubt its that because it would be a much louder "knock" and i would feel the car jerk back and forth if it did that.

Have to look at it... but as Tim mentioned. They many need to be tightened and yes, they will be a bit more nosier.

Tims2002gt wrote:Then they shouldn't really be any louder than stock. Might want to check the torque on those LCA's.

we'll there torqued down pretty well, all 4 of them bolts are on there pretty tight.

2006GT wrote:Have to look at it... but as Tim mentioned. They many need to be tightened and yes, they will be a bit more nosier.

its not much as noise...i can feel the knock in it from the rear end

Some LCA's are just noisy also. It is not uncommon for them to make a clunking sound, at least on my bodystyle mustang.

You might skim this thread and see if it is similar to your symptoms...
http://mustangforums.com/forum/2005-2011-mustangs/565457-rear-end-clunking.html

I thought JDWalton was really on to something with the orientation of the lca's but since you have the poly's (which also have a large/small side for inside/ouside orientation by the way) that may not be the issue. I had clunking issues after lowering the car and doing upper/lower lca's all at the same time and was able to adjust the upper LCA to correct the pinion angle and it's smooth now. My one-piece driveshaft also played into that and everything had to line up perfectly to get rid of the driveline slop.



hmmm? any comments on this paragraph?

1 piece driveshaft, and Upper adjustable LCA and a panhard rod, oh and wheels and tires

hey leonard, looks like you got some work cut out for ya :p

ok nevermind on the 1 piece driveshaft...way to FN (edited by Mod) much

Could possibly be the pinion angle. You'd need to get some adjustable upper control arms to correct that.

By any chance did you happen to compare the lca's you put on to the ones you took off? If they are any longer/shorter than the ones you took off then the pinion angle could very well be your problem.

hmmm, if i remember right, hector had to lift up the rear end a little to get the holes to line up.

any comments hector?


other than this, i love the control when i launch, its definetly alot straightor in the launches, i love it.

Wait until you get some good sticky tires for it! You'll really be smiling when you get on it.

could my U join on the Driveshaft be going out?

i think i'll paul look at it and see what he thinks, or have George look at it tomorrow on my lunch break

If its a real light knocking noise its probably pretty normal when you change the arms. I have a slight noise when I did my lower and upper arms, same as you described, happen sometimes when shifting. There really isn't much to screw up when changing the lowers out.

The stock arms hide alot of noises coming from the 2 piece driveshaft, so when you go to a different bushing, some noises start happening.

it doesnt feel light, this morning on the way to work some doushbag in a truck wanted to get infront of me at a light, i said nope not happening,
Well in the middle of that whole thing i hear a loud ass knock, scared the shit out of me, i was thinking the worst like my driveshaft got f-d (edited by mod) up. pulled over and everything looked fine, LCA's werent moving, driveshaft was good. exhaust was fine
i headed onto work and it drove just fine.

im not used to this

Guys.... watch the F bombs please. Been seeing it too often. Thanks.

Sorry Paul, wont happen again

No worries. I should be the last one reminding people to clean up the language... But we try to keep this place relatively clean. Now in the saloon.... swear all you want. Dein loves it!

well problem should be well fixed,
that little locking bracket that goes on the outside of the arm, one of them was right up against the sway bar....duuurrrhhh
bolts are tightened up to 130lbs and i should be good to go :)

Cool!

Dang... I just got on here and read all of this. Amanda was texting me the entire time. It almost sounded like i sold her some junk parts. I know they were good and i did have to make sure the arms were put in correctly. grease fittings facing down and the rear part of the control arms were matched to bushing orientation. More bushing sticks out on the inner part of the rear control arm. I feel dumb that I didn't catch that tab from the factory nut hitting the sway bar. DUUUUU!


One time on my car I left a bolt loose on one of my front sway bar links and that thing echo all over my dam car. I thought it was a control arm, exhaust or even the "u" joints. took a while to figure it out.

I felt dump once.... ;)

I'm glad its LCA... I thought one of those Killer Midgets got stuck under someones car agian!

Amanda just let the midget out of the trunk and he'll stop knocking!