Vz sv6 rear and knock

[Jolly mondo]

Hi I've recently purchased a 2005vz sv6 that had a trans oil leak but I got that fixed but now I'm getting a knocking sound in the rear end but not a constant knock I'll hear it then it' goes away, Ive noticed it happens most when I'm coming to a gradual stop or slowly parking. I'm hoping it's not my gear box but I thought ide need some advice, thanks oh yeah it's an auto.

 

[ant797]

Try changing your diff oil look at the condition off diff bush while your there ..changing diff oil is easy ..don't use cheap **** use penrite

 

[rambunctious]

I had a slight knock in the rear of my wagon which I eventually traced to the valves in the pedders rear shocks.
Could mostly be heard at low speed but not on highway.

edit....Also have a read up on diff cyclic knock that some VZ's had.

 

[Big Red VF-SII Go-kart]

I can identify with this peculiar and annoying knocking.
When I owned the VZ (Executive wagon, auto) and was moving out or moving back at low speed, there would be a repetitious and kind of alarming knock—knock—knock and a bit of side jolting from the rear of the car somewhere — you could not avoid not noticing it! Curiously, when carrying a touring load, it was much worse. It was not present when driving at street or highway speeds, just randomly with low speed turning forward or reverse. The cyclic knock of the diff mentioned above is the likely source. Penrite diff oil was put in there around 2011 and that's the last service I recall, save for cursory checks in the workshop at scheduled service intervals.

 

[Big Red VF-SII Go-kart]

I had a slight knock in the rear of my wagon which I eventually traced to the valves in the pedders rear shocks.
Could mostly be heard at low speed but not on highway.

edit....Also have a read up on diff cyclic knock that some VZ's had.

This.

 

[ant797]

I can identify with this peculiar and annoying knocking.
When I owned the VZ (Executive wagon, auto) and was moving out or moving back at low speed, there would be a repetitious and kind of alarming knock—knock—knock and a bit of side jolting from the rear of the car somewhere — you could not avoid not noticing it! Curiously, when carrying a touring load, it was much worse. It was not present when driving at street or highway speeds, just randomly with low speed turning forward or reverse. The cyclic knock of the diff mentioned above is the likely source. Penrite diff oil was put in there around 2011 and that's the last service I recall, save for cursory checks in the workshop at scheduled service intervals.

I used the green penrite oil the mechanic gave me synthetic I think with smooth shift additives