The early 4l60e gearbox's had a shallow pan and heat issue cause oil to come out of the filler not every gearbox did this as some r still running today I actually had this problem I replaced my gearbox in my vy and I got a vx 4l60e I didn't know about the pan so I got ripped off by gear box for a vx I didn't know but I know now after about a year started to pump oil out of the filler not all the time but when they made the vy they put a deep pan and a lock on the dip stick so holden new about this problem hope this helps
I read somewhere (possibly jc?) that vt was the first of the deep pans.
My vt is a s1, build date 8/98. It has a deep pan & a lock on the dip stick. I also have a second vt s1, build date 11/ 97 & it is the same as my vt (deep pan with locking dipstick).
Mine wasn't new when l bought them. So l don't know if they are original.