I'm running 5w-30 as well. I had a trans shop tell me to run the 80 -90w or they wouldn't warranty my transmission. I put it in there and made it around the block once. Shifting was not horrible, we put the 5w-30 in and it was business as usual. I also added one quart extra but don't recall the...
Mine's a 92 CC W350 somewhere north of 300,00 (speedo & odometer quit some time ago). I'm the second owner, had it for about half it's life.Wish my 96 f700 had a 5.9 in it. It's a 7.0 gasser. Found your website by surfing for medium duty truck forums. Kinda liked it, thought I'd hang and talk a...
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