Gary Lewis Posted August 26, 2020 Share Posted August 26, 2020 John, if you're so 'by the book' why was there any headache at all? Just talked to Cody at Royal Purple. They still recommend Synchromax MTF for the ZF5. For the Sag/hydroboost unit he said "Max EZ is slightly better than Synchromax." And there was emphasis on the "slightly". Later in the conversation he said "If you want to keep it simple and use Synchromax in both I have no problem with that. It meets the same ATF specs that Type F did and it'll work fine." I asked how much fluid for the Sag/hydroboost and he didn't know. He suggested that maybe having three 12-oz bottles of EZ would be enough, or four to be safe. But if I go with Synchromax he doubts it'll take more than one qt/36 oz bottle. Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted August 26, 2020 Share Posted August 26, 2020 Just talked to Cody at Royal Purple. They still recommend Synchromax MTF for the ZF5. For the Sag/hydroboost unit he said "Max EZ is slightly better than Synchromax." And there was emphasis on the "slightly". Later in the conversation he said "If you want to keep it simple and use Synchromax in both I have no problem with that. It meets the same ATF specs that Type F did and it'll work fine." I asked how much fluid for the Sag/hydroboost and he didn't know. He suggested that maybe having three 12-oz bottles of EZ would be enough, or four to be safe. But if I go with Synchromax he doubts it'll take more than one qt/36 oz bottle. You should ask Cody if they want to sponsor you and Big Blue! Link to comment Share on other sites More sharing options...
Machspeed Posted August 26, 2020 Author Share Posted August 26, 2020 John, if you're so 'by the book' why was there any headache at all? Good question, Jim. Dexron II which is clearly spelled out on my trans dipstick is no longer available. Supposedly, the later developed Dexron fluids can be used, however there is much controversy over the use of Dexron VI in my C6. Some say it ruined their trans. As such, I went with the closest formulation to Dexron II, that being the Dex/Merc. I had to read through a lot of stuff to make me happy and come to a conclusion on what to use. Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted August 26, 2020 Share Posted August 26, 2020 John, if you're so 'by the book' why was there any headache at all? Good question, Jim. Dexron II which is clearly spelled out on my trans dipstick is no longer available. Supposedly, the later developed Dexron fluids can be used, however there is much controversy over the use of Dexron VI in my C6. Some say it ruined their trans. As such, I went with the closest formulation to Dexron II, that being the Dex/Merc. I had to read through a lot of stuff to make me happy and come to a conclusion on what to use. Seems odd that Ford would spec 'GM' fluid, but it is what it is. I don't have an automatic, so I can't really say. I hope Dex/Merc is a good answer for my TC, because I don't want to go through that again any time soon. Link to comment Share on other sites More sharing options...
kramttocs Posted November 23, 2020 Share Posted November 23, 2020 Seems odd that Ford would spec 'GM' fluid, but it is what it is. I don't have an automatic, so I can't really say. I hope Dex/Merc is a good answer for my TC, because I don't want to go through that again any time soon. This thread comes up in the search results with a good title so continuing it... For the 1986 10.25 rear diff non-LS, the book calls for 7.5 pints of 80w-90. Looking at Amsoil Severe Gear and that site lists: 80w-90, 75w-90, 7w-110. Do you guys stick with stock? Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted November 23, 2020 Share Posted November 23, 2020 This thread comes up in the search results with a good title so continuing it... For the 1986 10.25 rear diff non-LS, the book calls for 7.5 pints of 80w-90. Looking at Amsoil Severe Gear and that site lists: 80w-90, 75w-90, 7w-110. Do you guys stick with stock? You came to this thread so you already know I'm filled with 75-140 front and rear. Yes, my 10.25 is not LS Link to comment Share on other sites More sharing options...
kramttocs Posted November 23, 2020 Share Posted November 23, 2020 You came to this thread so you already know I'm filled with 75-140 front and rear. Yes, my 10.25 is not LS Thanks Jim - yep, your comment was what the search picked up on. What was the reason? I've done some reading as I haven't ever done other than stock. Seems like newer Sterlings use the 75-140. Link to comment Share on other sites More sharing options...
old55pete Posted November 23, 2020 Share Posted November 23, 2020 This thread comes up in the search results with a good title so continuing it... For the 1986 10.25 rear diff non-LS, the book calls for 7.5 pints of 80w-90. Looking at Amsoil Severe Gear and that site lists: 80w-90, 75w-90, 7w-110. Do you guys stick with stock? I am going to say that the 75 w 90 would do fine in your diff. A little lighter when cold, but not enough to worry about. Link to comment Share on other sites More sharing options...
kramttocs Posted November 23, 2020 Share Posted November 23, 2020 I am going to say that the 75 w 90 would do fine in your diff. A little lighter when cold, but not enough to worry about. Thanks Steve. That's what the Amsoil tech recommended as well over the 80w-90. Link to comment Share on other sites More sharing options...
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