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The broken one was the 4.08 ring and pinion swapped into that carrier to use the big axles. I went to the the 3.69 Q45 diff this season because it has the same big 13 tooth pinion as the 3.54.
I believe the only reason I broke the diff last season was due to the sidewall of my slicks getting weak and having traction issues. The car was loading and unloading the tire hard for the first 30 feet much like having too low of tire pressure would do. I think it cracked the pinion then and I had the failure at the next race with new tires. I'm hoping the big pinion works out this year but I dont think I would have broken the 4.08 if I didnt have those problems.
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