FG XR6T MKII ZF auto - loud bang/thud from gearbox shifting into second under full throttle

[timburns23]

Just wondering if anyone can shed some light on what this could have been.

 

Stock standard 2012 FG XR6T MKII, ZF auto, 38,000KM

 

Rolling over a give way into a 100kph zone I floored it and when it shifted into second gear there was a very very loud bang / thud from the gearbox. It continued to drive fine, so slowed down and floored it again but this time it shifted fine into second, and hasn't done it since.

 

I'm wondering if I should service the transmission, its only done 38,000KM but is 5 year old oil in there?

[Ale]

Sure it wasn't the diff bushes and the rear end knocking, not the trans?

[timburns23]

Well, I remember immediately looking at the gear shifter / ICC area thinking it had come from around there, not behind me.