Hydraulic Jacks

ALL Hydraulic Leveling jack systems use Dextron ATF. Jack systems are aftermarket and are NOT part of the chassis system or part of the chassis manual for fluids. Ford/Chevy/Freightliner/Spartan/Workhorse never installed leveling jack hyd systems. NEVER use any type stop leak on a Hydraulic Leveling jack system. Doug

My 1993 HR has a HWH system that takes ATF. That is the GM fluid, not Ford, and was previously known as Dexron I or II. Since Allison (GM) no longer makes Dextron I,II, or even certifies after market products, you may have to look for after market AFT made for a GM or Chevy. (I believe the newer Dexron III is compatible, but I'm not sure. I also believe the newest Dexron IV is not compatible.)

Mine takes Dexron III. Be sure to check the fluid level with jacks up and slides in (if slides are hydraulic).

Our 1995 P30 Manual says, "GM Hydraulic Power Steering Fluid (GM Part NO. 1052884 or equivalent)".

I just re-read the OP and noticed the topic "Hydraulic Jacks".
Our Quadra Mfg "Big Foot" Hydraulic Leveling System Manual says, "fill with 46oz Dexron I or II.

ATF will work but I'd probably add a Lucas power steering stop leak for something that old. Get two birds with one fill up.