| I finally got my new differential with Mark Leaders 4.10 gears installed in it and these things are fantastic. I've got a set of HKS 2510's. They aren't as laggy as 2530's but they still didn't really come alive till 4,000 rpm. Before the gears the car had an average pull up to 4 krpm then a huge jump launch in power. With the new gears, the big jump in power is gone and replaced by what feels like a smooth constant power pull from 3,000 rpm. The rpm's just driving around really aren't that much higher. Usually 200-400 rpms. I wouldn't have notice if I wasn't looking for it. I've got an excel chart that gives the engine rpm vs. speed for 4.10 and 3.69 gearing with a tire input size. Shoot me an email and I can send you a copy. I got the gears directly from Mark. He set me up with a shop to install them, answered a ton of questions, and just went out of his way to help me out. This is definitely the one of the best upgrades I've done recently. It is well worth the money.
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