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Mobil 50 trans fluid update 2 members active in this conversation (including you) Mopar1973Man Not read yet Scottyv Read: Just now Scottyv 0 Started conversation: yesterday at 10:14 AM Hi, New to you site but long time follower of you on this and other sites you post, thanks for many great tips and advice to me and other 5.9ers . I just had my trans replaced while on a trip in Wyoming. the Guy who did the work seemed confident but he put "BG750 ultra guard gear oil". I was interested in your test with Mobil 50, I have followed your posts but was wondering if you have and update. (Im not finding the stock oil) and looking at Amsoil MTG or the oil your using. Just looking to change it out with a the most correct oil, I also just read that your trans broke. mine broke from third gear and the input shaft, so I opted for the large 1 1/3rd inch shaft. the Shop that put in the trans and SBDD clutch put in the following oil, (which concerns me a bit. Wondering what you think?) He filled the trans with The BG750 says GL5 plus Gl4 . (but I'm just not wanting to rebuild again in a year or so, due to the syncro issues. It shifts a little notchy in first and reverse. but there is only 1000 mile or less on it. Any advise would be helpful, I can go from there, Thanks BG 750 Product description says. BG Ultra Guard is the first "true" multi-purpose gear oil available in the automotive market. It is a synthetic (polyalphaolefin) gear oil blended to SAE 75W-90 viscosity and can be used in all car and truck axle applications calling for a GL-5 gear oil. It can also be used in all truck standard transmissions and automotive manual transmissions, transaxles and transfer cases calling for GL-4 gear oil, engine oil or ATF, as long as viscometric requirements are satisfied. BG Ultra Guard provides thermal stability, optimum drive line efficiency, quieter operation, protection against wear, pitting and corrosion, seal compatibility and improved seal performance, improved fuel efficiency, reduced maintenance, long drain life, extended component life, application versatility. BG Ultra Guard is covered by the BG Best Guarantee Program.