My Willys 3A and 3B Community

3A, 3B, DJ Technical Knowledge Base => "Original"-- Technical Questions, Answers, Observations => Topic started by: aboyandhisdog on July 12, 2011, 08:13:27 PM

Title: Diff. fluid
Post by: aboyandhisdog on July 12, 2011, 08:13:27 PM: Howdy,
What do you guys like to use in the differentials? My manual says "MIL-L-2105B" 80 wt. but I have no idea what I'm looking for. Would a 75/90 wt. gear lube do the trick? Thank you!
Title: Re: Diff. fluid
Post by: rocketeer on July 12, 2011, 10:00:05 PM: I prefer straight 90W gear oil but it's virtually impossible to find so 80/90W is what is recommended. Personally I'm going with 80/140W. I don't recommend that if anyone does a lot of highway driving as there is a slight concern for increased heat.

Larry
Title: Re: Diff. fluid
Post by: aboyandhisdog on July 12, 2011, 10:44:28 PM: Thanks again, Larry. Am I correct to understand that a "GL-4 is not needed as there are no "yellow" metals?
Title: Re: Diff. fluid
Post by: bayo500 on July 17, 2011, 02:48:29 AM: I use ï¿½ - ï¿½LS 90 DIFF OIL GL5 ï¿½- ï¿½ ï¿½ for front and rear hypoid diffs - your diffs have hypoid cut gears

For the GEAR BOX and Transfer box i use - ï¿½ 80W90 GL5 GEAR OIL ï¿½- does not attack yellow metal (sincro rings)

My book says Trans-Gear 80 GL 4 is a 4 /5 speed gear box oil, i wouldn't use this.

So for your jeep you need 3 types of oil ï¿½ ï¿½ Engine oil - ï¿½Diff oil - ï¿½Gear oil ï¿½ - ï¿½sitting in your garage all clearly marked... just like mine wasn't