Curt Curtiss Posted June 20, 2016 Share Posted June 20, 2016 I am looking to top off the rear diff, the trans and free wheeling unit in our 8-98 and I am not sure what fluid I should use. Do these take normal 90w? Thanks, Curt Link to comment Share on other sites More sharing options...
Spinneyhill Posted June 21, 2016 Share Posted June 21, 2016 (edited) If there is brass or bronze in there, be careful with EP additives. There are a few that don't attack brass or bronze. You need to read the MSDA to find out. You need to check the copper strip corrosion test (ASTM D130). If the result is 1a, it is a good additive for your yellow metal. 1b to 4c is not good enough. You would get far greater exposure for this question if you put it in the Technical forum, with information about the type of gearbox and diff. I don't know anything about your vehicle or how long you have had it nor what you know about what oils are in there and how long they have been there. If I were in that situation, I would not "top off" the oils but drain and refill. Edited June 21, 2016 by Spinneyhill (see edit history) Link to comment Share on other sites More sharing options...
Curti Posted June 22, 2016 Share Posted June 22, 2016 Curt, your transmission was made br Detroit gear and machine & LGS free wheel unit. Go to NAPA and buy 80-90 gear lube. Link to comment Share on other sites More sharing options...
Curt Curtiss Posted June 24, 2016 Author Share Posted June 24, 2016 On 6/22/2016 at 7:06 AM, Curti said: Curt, your transmission was made br Detroit gear and machine & LGS free wheel unit. Go to NAPA and buy 80-90 gear lube. Thanks! Is the same lube good for the rear end? I used to use the Sta-Lube SAE 85W90 SL24239 API/GL-4 Multi-Purpose Hypoid Gear Oil from NAPA for my old British cars that had brass and bronze bits. I understand only GL4 is safe for those and figured it would be good for these. Link to comment Share on other sites More sharing options...
Curti Posted June 24, 2016 Share Posted June 24, 2016 Use 140 wt for the diff. Link to comment Share on other sites More sharing options...
Mike Dube Posted June 24, 2016 Share Posted June 24, 2016 Curt, Is API/GL4 in 140 OK for the Auburn/Columbia 2 speed axles? Link to comment Share on other sites More sharing options...
Curti Posted June 24, 2016 Share Posted June 24, 2016 If you drive any distance yes! Link to comment Share on other sites More sharing options...
Curti Posted June 24, 2016 Share Posted June 24, 2016 The ACD Website is down again error 404 Link to comment Share on other sites More sharing options...
Curt Curtiss Posted June 25, 2016 Author Share Posted June 25, 2016 I have a single speed axle, still the 140? Link to comment Share on other sites More sharing options...
Curti Posted June 25, 2016 Share Posted June 25, 2016 Ya, 140 for a single speed. I know a guy out east that has an early Dual Ratio he would like to sell. It makes a huge difference in the drive-ability of the car. 1 Link to comment Share on other sites More sharing options...
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