Hi all,

 

When I bought my car the trans was replaced under stat warranty because it was creating a noticeable thud when going to overtake on the highway as it shifts from 6 to 4. The replacement trans was fine until recently when it started doing the same thing. It'll also do it if it shifts to 5 and then 4 in quick succession but less so. All other shifts up and down are butter smooth. If I manually quick shift from 6 to 4 it still does it but it's not as harsh.

 

Trans mounts are fine. Engine mounts are fine. Everything else on the car is in good shape.

 

I've looked high and low and I can't find a single case online where someone has had this issue, let alone twice on two boxes in less than a year.

 

Could it be the torque converter having a delay in unlocking? Could it be the E clutch wearing out (3rd to 4th shifts are fine though)?

 

My diff bushes and centre bearing are quite new and fine.

 

I'll probably take it to a trans shop in a few weeks, but if I can get some idea in the meantime it'd be great.

 

Cheers.

Shift to 5th first manually first. Shouldn't be planting it in 6th anyway.... Take it back to ask which condition the ZF was in before it was replaced as it might not have been in perfect condition. 

it was probs just replaced with another one from the wreckers 

 

get a trans shop to pull it out and check, may as well get it rebuilt and tuned

 

is your car stock?

Edited February 1, 20251 yr by bossmang

Car is a more or less stock configuration. Just an n/a.

 

I've heard rebuilds are about 6k which I don't have unfortunately. I'm a disability pensioner at uni.. so if I did replace it it'd have to be a third 2nd hand box and I'd probably have to do the changeover myself.

First thing is to give it a trans service. After that, if money is tight, just learn to live with it.

 

Rvo in Dandenong does stock rebuilds for 4k or less and obviously valve body reconditioning is much cheaper. Here are the current turbo box prices