2000 jaguar s type auto trans

zigjag61

I have a 2000 s type 3.0 the trans goes into reverse or drive no problem But taking off is very slow like its stuck in 3rd gear as I'm driving no mater where the shifter is in what gear it stays the same I can't down shift and seems like 4th isn't there because it tacks at 61 mph at 2800 on rpms.
Could level be low or? 
I also can't find fill plug on trans someone said there is one on rear of trans others say its up in eng compartment 
Thanks in advance if can help 

Mr_Shiftright

Nothing you should mess with. These are allegedly "sealed for life" but they can be serviced. It's complicated, and the fluid is quite expensive. I would suggest having the transmission diagnosed by a professional shop before attempting anything.