Rear Thud noise when changing gears???

[futronix]

What would cause the following.....

when putting the auto in reverse i get a thud from the back of the car sounds like from near the diff.....

also does it when driving between speeds of around 40km/h - 60km/h, but when i release the throttle just as its going to change gears up it wont thud...

BTW its a pretty recent reco trans put in...... and its been doin it before and even after the trans was changed....

cheers

 

[digisol]

Sounds like a rear Uni joint.

Change it from D to R over and over and it should not make any noise, if it does the uni/s being RS is a safe bet.

 

[futronix]

cheers.....

anyidea on average price for a new one and labour or can you do it yourself???

 

[digisol]

Depends on your mechanical knowledge, they can be buggers to get the bearing cups out, so it would pay if you have done it B4.

Most mechanics charge at $60 / hour, the uni's could be up to $40 each depending on quality.

Also what they find ? it could be the other centre uni's as well, once one goes they usually follow in sympathy, get a free quote so you know what's really wrong, low oil in the diff may also add to backlash in the running gear.

You will need ramps at a minimum, unless your a matchstick, no offence, but I am used to working on diesel cruisers that you can get underneath, actually a good dry place to sleep out in the bush, under the tray on a swag.

 

[futronix]

thnx digisol for the info......

might just get the local mech do take a look....

 

[digisol]

NP bloke, probably simpler and much faster to get someone that knows their stuff to do it for ya, I can't see it taking more than an hour and a half to do all the uni joints, if that's the problem ?

They can be bashed out with a hammer and the right size socket but a press does it faster, better with less chance of damage, they are usually rusted in or very tight.

Getting the new uni's in is better done with a press, as the 4 cups are full of small needle roller bearings that may be disslodged when hitting em.

And get greasable uni's if possible, they last longer than the sealed units.