Quote:
Originally Posted by Mild2Wild
Does anyone have any real info on if, and by how much, the IS300 differential is stronger than ours? I could pop the 3.91 pumpkin in and send out the stocker, but if there's a big disparity in strength that might not make sense.
It's all stock driveline--apart from the clutch--for now; I have replaced the left stock axle with a used OEM part after going to the strip for fun on my previous setup (430whp) and subsequently getting a little clicking from it, but I was almost 2" lower at that time and got some bad wheel hop on one run in particular. Crossing my fingers I am not forced to upgrade this year, as I'd rather wait and tackle that for next season. A friend has a 450whp ls1 240 that's been happy to rip donuts, burnouts, and go drifting on the stock driveline, so here's to hoping I will be so fortunate.
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People claim to have ran low 10's on is300 forums with the stock LSD M85. There is a guy on here with a 2j swap who ran the m85 that grenaded on him around 500hp I believe. I ran mine at 470whp but didn't do any hard launches as that would be an immediate axle killer with my 285 Yokohamas.
If you're staying under 500whp the m85 will be plenty strong. Its when you go in to the 550-600+ range that they start to fail catastrophically on hard launches. If you roll in to it, they're pretty good.