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My gearbox was built by Hart Transmissions up here in QLD and a lot of the parts came together from a guy who gave up on his gearbox build.
From him I got the the gearsets, G casings, PAR 3rd and some provided synchros and misc bits. I took it to Hart and told them to buy me a mFactory diff, then build the box to take 250hp daily as that was, and still is, still my end goal.
$6k later I had a finished gearbox [custom clutch included in that]. Granted mine was definitely on the pricier side, but it's been absolutely faultless. Fluid always comes out clean, no metal shavings, etc. The motor will blow before this box does.
Story time over, for you just give it a standard rebuild. Talk to them and explain that the box is taking more power than it should and are there any options in terms of strength and reliability? Fresh synchros, fresh bearings and seals and it should do you for another 8 years mate.
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