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Hey Bigred350, did your M985 go through a reset/rebuild program in 2001? Also, is it an '87 model year? I would also be interested in the VIN as your rig looks like mine. I am curious as to how close the VINs may be. Here is mine after a WD40 application. And before

There are a lot of opinions on trans fluid. I talked to a buddy of mine who spent years in the trans business. He suggested I stay with the 15w40 as that was what the trans started life with and it handles the temps better, so I stayed with it. As far as eng and trans temps, I don't trust those...

Here is the adaptor you are looking for. https://dieselpro.com/detroit-diesel-parts/8v92-engine-turbo2/oil-filter-8v92/detroit-diesel-25010854-oil-filter-adapter.html#.Wp1NSY2ovcs

TM says 30 quarts with filter change, but my M985 took a few more than that. So start with 30 and check the level after a brief run and top as needed. You will enjoy the beast, I know I do mine. The only difference between your M977 and my M985 is the crane capacity. M977 is 2500 lbs and the...