What is the proper fluid to use for hydraulic system

gooseroller

New User
I have a Ford 981 with a select-o speed transmission and I had a leak in the hydraulic system, one of the seals in the pump was bad. I fixed that and need to refill the reservoir and is it the same fluid I would use for the transmission?
 
I would get the correct Ford oil myself. That is 134-D fluid. Other brands MIGHT work correctly. IF they do not your going to spend some good money repairing a SOS transmission. So a few dollars saved on oil might be costly.
 

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