RCWD21 Posted March 21, 2015 Share Posted March 21, 2015 Ive searched multiple forums but i cant seem to find my answer anywhere and now that my gas mileage issue has been fixed I'm finally getting around to changing the differential fluids (did the front today) but here's my question. How much additive do I put in? I have a tube of trans-x posi-trac additive and it says to add the whole tube but I'm not sure if that's too much or what. I know there are oils that already have the additive but I can't return this tube and since I have it I might as well use it. Its a 7 ounce tube. Anyone have an answer for this? This is the last fluid I have to change. Link to comment Share on other sites More sharing options...
92Path_68CJ Posted March 21, 2015 Share Posted March 21, 2015 Hmm.... FSM doesn't say. Unless Im reading it wrong it says to just use LSD compatible fluid... I'm hoping someone else has a concrete answer. Link to comment Share on other sites More sharing options...
Precise1 Posted March 21, 2015 Share Posted March 21, 2015 Some people have used LSD additives with regular oil, but I thought they were usually used in some sort of ratio to the amount of oil being replaced. I don't know this product so can't say anything about it, but ultimately, just follow the directions? It is for LSD rear ends? B Link to comment Share on other sites More sharing options...
RCWD21 Posted March 21, 2015 Author Share Posted March 21, 2015 It says limited slip gear oil additive on the front and per the directions it says to add the entire contents of the tube but then it says not to overtreat. I was told to try half the tube at first and see how that did but now I'm unsure of what to do. Link to comment Share on other sites More sharing options...
Precise1 Posted March 21, 2015 Share Posted March 21, 2015 Try contacting the manufacturer, stating the capacity of the diff and asking the proper amount to add, point out the vague directions if necessary. Most companies want you to use their products 'correctly' so you'll get good results and keep using them. B Link to comment Share on other sites More sharing options...
RCWD21 Posted March 21, 2015 Author Share Posted March 21, 2015 I'll try that. Thanks for the idea! Now here's a question, how much fluid does the diff hold? Link to comment Share on other sites More sharing options...
Precise1 Posted March 21, 2015 Share Posted March 21, 2015 5&7/8 pints, so 3 quarts, but I want you to do something as well. Go to the pinned FSM thread in the Garage section, follow the links and download your own free copy of the 1994 year (the earliest one) and look in the MA file. The vast majority of the info is the same as the 1990 model barring dash, exterior trim, timing belt intervals and tie rod end sizes. 95% of it applies to you and is your new bible... B Link to comment Share on other sites More sharing options...
RCWD21 Posted March 21, 2015 Author Share Posted March 21, 2015 I actually looked in there and couldn't find it haha I may have just over looked it. Every vehicle I've driven and worked on I find an FSM for it. Best thing out there haha but thanks for the info! Link to comment Share on other sites More sharing options...
92Path_68CJ Posted March 21, 2015 Share Posted March 21, 2015 5&7/8 pints, so 3 quarts, but I want you to do something as well. Go to the pinned FSM thread in the Garage section, follow the links and download your own free copy of the 1994 year (the earliest one) and look in the MA file. The vast majority of the info is the same as the 1990 model barring dash, exterior trim, timing belt intervals and tie rod end sizes. 95% of it applies to you and is your new bible... B I checked there for the LSD additive. I might have missed it, but it doesn't seem to mention even using LSD additive, just compatible oil. Link to comment Share on other sites More sharing options...
RCWD21 Posted March 21, 2015 Author Share Posted March 21, 2015 (edited) I'm just going to try and return this tube and get 3 bottles of castrols LSD oil and go with that. Edited March 21, 2015 by RCWD21 Link to comment Share on other sites More sharing options...
Precise1 Posted March 21, 2015 Share Posted March 21, 2015 How ever you want to do it. I put Castrol w/additive in my first 1995 and it worked well. Well enough that I had to watch the gas pedal while turning at slow speeds on wet roads... I checked there for the LSD additive. I might have missed it, but it doesn't seem to mention even using LSD additive, just compatible oil. Correct, it states LSD gear oil GL-5, but that is really only gear oil with a LSD additive pre-mixed; oils are all formulas these days. My referencing the OP to the FSM was mainly page MA-8 where it shows the types and capacities of fluids and lubricants. B 1 Link to comment Share on other sites More sharing options...
RCWD21 Posted March 21, 2015 Author Share Posted March 21, 2015 My big thing is just the confusion on how much to add to the oil for the correct ratio. I don't want too much or too little. And its not much more to just get the oil with the additive already mixed in. Plus its easier and its a well known oil Link to comment Share on other sites More sharing options...
RCWD21 Posted March 21, 2015 Author Share Posted March 21, 2015 I may just keep the tube and put half in the front diff and the other half in the transfer case. It says it can be used in both and it has friction modifiers so it'll only improve the performance of the oil in there Link to comment Share on other sites More sharing options...
SpecialWarr Posted March 22, 2015 Share Posted March 22, 2015 My tube of Additive says to partially fill the diff with the intended oil, empty the tube into the diff, then fill the diff until it's full. Not that I've done that yet. Link to comment Share on other sites More sharing options...
RCWD21 Posted March 23, 2015 Author Share Posted March 23, 2015 What brand is the additive you have? Link to comment Share on other sites More sharing options...
SpecialWarr Posted March 24, 2015 Share Posted March 24, 2015 Ahhh. I believe it's Posi-Trac.. ah yes, yes it is... http://crc-canada.ca/automotive/leak-stopper/posi-trac-limited-slip-gear-oil-additive-207-milliliters.html Link to comment Share on other sites More sharing options...
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