LLave Posted September 1, 2010 Share Posted September 1, 2010 Monday I sheared off all 4 bolts on the drive shaft/diff. They were fully threaded non factory POS bolts. It looks like the threads got pounded flat, allowing a little bit of moment, then it was just down hill from there. So what do you guys use? What is the correct spec for these bolts? Quote Link to comment Share on other sites More sharing options...
deja Posted September 1, 2010 Share Posted September 1, 2010 8mmx30mm socket bolts. I think the conversion for grade 8 in metric is 12.9. Use loctite on the nuts. Quote Link to comment Share on other sites More sharing options...
rossman Posted September 1, 2010 Share Posted September 1, 2010 Find a 8mm 12.9 (or grade 8 5/16") bolt with a shank long enough to pass thru the shear plane made by the mating flanges. Its not a good idea to put threads in shear. Quote Link to comment Share on other sites More sharing options...
johnc Posted September 1, 2010 Share Posted September 1, 2010 SAE grade 8 is DIN/ISO class 10.9. Quote Link to comment Share on other sites More sharing options...
LLave Posted September 1, 2010 Author Share Posted September 1, 2010 I am most concerned with getting a bolt that is a nice tight fit, and that has enough smooth shank to pass through both surfaces. I may end up getting a longer, partially threaded bolt and trimming it to fit. Over thinking it, possibly. Quote Link to comment Share on other sites More sharing options...
Dan Juday Posted September 1, 2010 Share Posted September 1, 2010 All good replies. A driveline shop is a good place to find the correct bolts. The shop I got mine at just tossed then to me, no charge. Quote Link to comment Share on other sites More sharing options...
LLave Posted September 1, 2010 Author Share Posted September 1, 2010 Hah, I didnt even think of calling a driveline shop. I will give that a shot. Quote Link to comment Share on other sites More sharing options...
LLave Posted September 9, 2010 Author Share Posted September 9, 2010 Got some nice bolts in there. The holes in my diff were almost exact fit for a 3/8 fine thread bolt shank (but not a course, go figure). I had to just tough the drive shaft to get them to slip fit. Bought some grade 8, 3/8 fine thread bolt with the right length of smooth shank. Cut the threads shorter and dressed with a file. Worked like a charm. Only... they came loose the first time i drove. This weekend I will be adding some trust green loctite. Too bad i have no garage right now. Wrenching in the dirveway anypone? Quote Link to comment Share on other sites More sharing options...
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