Jump to content

Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse

- - - - -

thumping when on the gas or on the brake

  • Please log in to reply
7 replies to this topic

#1 johnw



  • Members
  • PipPip
  • 24 posts
  • sandy,oregon

Posted 23 October 2013 - 07:34 AM

on my 86 rx when i take off there is a hard thump from under my seat it does the same thing when i hit the brakes i thought it was the rear cv axle because it was bad.. so i changed that and it still does it.. it feels like the driveline my come up into the seat lol.. not sure it is because its lowered and the drivline sits at a bad angle or what but i am getting really upset with it if anyone could help that would be great.. it does have a center bearing on the drivline but i cant seem to find them at any auto parts stores

#2 scoobiedubie


    USMB is life!

  • Members
  • 604 posts
  • Aloha, Oregon

Posted 23 October 2013 - 09:09 AM

Those center bearings don't come of easily. I bought a used driveshaft with less than 125,000 miles. My first driveshaft bearing lasted 325,000 miles.

Look for wear spots or impact marks on the undercarriage. Especially around moving parts like the driveshaft knuckles. The shift in the balance of the car, may compress the body down to hit some portion of the driveshaft. The only fix may be to raise it back up.

#3 johnw



  • Members
  • PipPip
  • 24 posts
  • sandy,oregon

Posted 23 October 2013 - 10:12 AM

oh i plan on raising it back up this week if i would have wanted a lowrider i would have got a honda  :lol: i think a subaru should be a subaru just my 2 cents lol 

#4 ruparts


    Subaru Nut

  • Members
  • 565 posts
  • hooper, co

Posted 23 October 2013 - 01:24 PM


  i would suspect the rear transmission mount(s)  allowing the trans to lift and thump the tunnel. ? if it's a 4x4

 might also check the upper front mount on the rear diff ,  the one that attaches to the rear suspension crossmember .

Edited by ruparts, 23 October 2013 - 01:27 PM.

#5 l75eya


    Almost has it all figured out

  • Members
  • 2,284 posts
  • Hoboken, NJ

Posted 23 October 2013 - 01:50 PM

Just because it's easy to do and it'll rule something out if this isn't it;


Check your front brake caliper. Raise the car up, pop off the wheel and grab the caliper and see if it has any play. Take out the bottom (14 mm I believe) bolt and swing the caliper up and then slide it off the top bolt and then check that top bolt to make sure it is tight.

Just a thought.

#6 el_freddo


    Eat, Live, Breath Subaru

  • Members
  • 608 posts
  • Lancefield, Vic, Aust.

Posted 25 October 2013 - 06:54 AM

Also check:


- the stay pitch rod or what ever it's called - the one from the engine to the firewall.


- gearbox crossmember bolts


- centre bearing bolts


- rear seat is bolted in properly


- nothing is loose in the storage space in the boot - something could be rolling around in there...



#7 MilesFox


    Catch this Fox!

  • Members
  • 10,686 posts
  • Madison/Milwaukee, WI

Posted 25 October 2013 - 08:39 AM

transmission mount. squeeze some 3M windo-weld urethane from a caulk tube in the bbushigns to beef them up. They probably have separated. Let the product cure for 24hrs before driving or it will squeeze out.


...if you cannot find oem replacements

Edited by MilesFox, 25 October 2013 - 08:39 AM.

#8 johnw



  • Members
  • PipPip
  • 24 posts
  • sandy,oregon

Posted 28 October 2013 - 01:42 PM

well i put it back to stock height well its a little taller then stock i used wagon struts and springs and the thumping is not as bad now but it drives so much better

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users