John Deere 1600 swather pump

I have a John Deere model 1600 swather with the 540 rpm planetary gear case on the pump.

 

I would like to have 1000 rpm gearcase so I can use the 4630 to cut hay.

 

Does anyone have a 1000 rpm gearcase that they would swap for a 540?

 

Or do you have a pump with the 1000 rpm gearcase that you are willing to sell?

 

Thanks,

John Deere 1600 swather pump