ok need HELP with VR GEARBOX CLUNKING NOISE

[peckzz]

ok hi guys and if your reading thanks for taking pitty on me or to laugh at me haha.

ok what happened, changed this box about 3-4 months ago, put a second hand one in, was running fine good as gold, then all of a sudden i went to sydney for new years and then a clunking noise apeared, i thought it was the main bearing, same noise as what the main bearing makes, my mates dad was there and he is a mechanic, he had a look and said its not maint bearing because with main bearing soon as you just come off idle it clanks more and worse, but this stops, so he got underneath the car wit his screwdriver, had a listen and said its from the gearbox, he thought it might be the tourque converter come lose or cracked, toook the bellhousing off checked the tourque converter, it was fine, turned it and the clanking noise was from the back of the gearbox, we put it back together, not much we could do at 2am in the monrin an i had to go that following day back to temora near wagga wagga, so it made it home, not a problem, only noise is when its idling, soon as its off idle it goes away, but it is a BAD noise if you know what i mean, but im not sure because its not slipping gears or anything like that, still down selecting gears as you brake normally, so i am unsure, any one know of any ideas? i was thinking, just maybe, that the oil pump had come lose in the gearbox, but would you still be able to drive it 450km with the oil pump lose? any ideas let me know thanks, also it is a little less noisy when its warmed up, but still bad noise, thanks again

EDIT the clunking noise is in drive and park and reverse, all gears, just off idle nothing though

[hako]

I'd reckon it's the flex plate loose on the torque converter - the noise can travel. How is the uni joint just behind the transmission....or the rear engine mount? - not soft and sagged allowing box to contact chassis.
Another site suggests this for a similar problem to yours:

Trans seems noisy when moving in 1st and Reverse, noise goes away instantly if you shift to N or the trans goes into 3rd gear: Reaction planetary is worn out due to high miles or insufficient lubrication. Not a critical failure, but not a good sign either. R&R sooner rather than later.

[peckzz]

I'd reckon it's the flex plate loose on the torque converter - the noise can travel. How is the uni joint just behind the transmission....or the rear engine mount? - not soft and sagged allowing box to contact chassis.
Another site suggests this for a similar problem to yours:

Trans seems noisy when moving in 1st and Reverse, noise goes away instantly if you shift to N or the trans goes into 3rd gear: Reaction planetary is worn out due to high miles or insufficient lubrication. Not a critical failure, but not a good sign either. R&R sooner rather than later.

hmmmm but this happens in p,r,n,d,3,2,1 all gears, i will check mounts, but sounds worse than just a mount, something is lose, because in theory if something is lose and you spin it fast enough it will straighten up true? well this is what is happeneing i think, soon as the engine revs up and speeds up the thing that is knocking pulls itself straight if this makes any sense

[Brett_jjj]

Thats the luck of the draw when you fit second hand autos,it might be only slightly better than the one you replace.Get a fully reconditioned one with warranty.Or you can try your luck with another second hand one.

[hako]

Have you checked the flex plate as mentioned before...maybe it's either loose or is cracked.
When you installed this trans did it by any chance 'hang' during installation before bolted up?

[peckzz]

Have you checked the flex plate as mentioned before...maybe it's either loose or is cracked.
When you installed this trans did it by any chance 'hang' during installation before bolted up?

not sure what you mean by 'hang'???? it was on a jack?


and if you mean flexiplate as in flywheel? that all seemed fine when we took the bellhousing off, when we spun the tourque converter the noise apeared more towards the tailshaft of the gearbox

[hako]

If the box slips off the jack when 'almost' home it will hang on the flexplate and can distort it.
The flexplate can crack where it bolts to the crankshaft or where it bolts to the TQ especially if the bolts have not been torqued correctly or if it has hung during installation.
I'd eyeball the plate again with a strong torch. There is not much towards the back of the box that could make a clunking noise......PARK pawl?....excessive wear at rear extension where tailshaft enters box?

[BT1-355]

yeah it sounds like a broken or loose drive plate

[peckzz]

seems everyone is saying the flexiplate-driveplate which in this case should be the flywheel i think you are on about, but when i spun the tourque converter it was coming from the back of the gearbox not the front towards the flexiplate? hmmmm, from memory to get to the flexiplate i have to take the gearbox out as i can only get to the tourque converter by taking the bellhousing off the bottom, but still cant get to the flexiplat


by flexiplate you mean flywheel right?

and to answer your question no it never did hang, i lined it all up an slid in first go not a problem, because i never took the tourque converter and flywheel off when changing this box, i lined the splines on the TC so they were horizontal and had anothe TC spare, so put that in the box out of the car and lined it up horizontally so it would just slide straight in, as it did, didnt need to take the TC or flywheel off.

but im sure its coming from the back of the gearbox, i will check the flywheel tonight some time as i have work today

thanks for your ideas and help and KEEP POSTING

cheers again

[peckzz]

[QUOTE=hako;1411908.PARK pawl?....excessive wear at rear extension where tailshaft enters box?[/QUOTE]


what ya mean park pawl?

thats wat i was thinking it might be, tailshaft centrebearing or where it enters the gearbox, but the tailshaft is only spinning in gear, this noise is out of gear or in gear does not matter, so that rules that out becuase i have a spare tailshaft that would just be too easy haha

[peckzz]

ok got the mechanic across the road to have a listen, he said pretty much it can either be 3 things, tourque converter, flywheel or gearbox

[hako]

There is no flywheel in an automatic car - the torque converter acts as the flywheel and the flexplate with ring gear attached is bolted to the TQ to connect the transmission to the engine and allow the starter to mesh.. Re the PARK pawl - this engages when you select PARK and stops the output shaft from turning...it's a slug of high tensile steel that engages with splines in the shaft...never heard of one coming loose but anythings possible!
Towards the back of the trans is a device that rotates with the output shaft and senses when it rotates by centrifugal force and somehow prevents you selecting reverse when going forward or PARK when in motion. ( faster than walking). maybe this is busted.
Note that I am only guessing!!!!

[peckzz]

There is no flywheel in an automatic car - the torque converter acts as the flywheel and the flexplate with ring gear attached is bolted to the TQ to connect the transmission to the engine and allow the starter to mesh.. Re the PARK pawl - this engages when you select PARK and stops the output shaft from turning...it's a slug of high tensile steel that engages with splines in the shaft...never heard of one coming loose but anythings possible!
Towards the back of the trans is a device that rotates with the output shaft and senses when it rotates by centrifugal force and somehow prevents you selecting reverse when going forward or PARK when in motion. ( faster than walking). maybe this is busted.
Note that I am only guessing!!!!

hey i fixed the problem, and yes there is a flywheel in a automatic car, that is what the starter motor spins to start the eninge, in any case it was the fly wheel that was cracked, so i will take a pic tomorrow as its 1.30am and only just got in from the shed working on it, but yes there is a flywheel on almost everycar, well yes everycar that holden or ford make have a flywheel or in other words flexiplate or drive plate, all meaning the same thing, but yes you have your facts mixed up, goes engine, flywheel, tourque converter, gearbox

but any way all fixed will post pics tomorrow