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I'm running Getrag 6 Speed now, I had MIJ Performance install the gearbox, driveshafts etc. I'm running 780 BHP (Fly) and have had no problems. The gearbox is really solid and speaking to over GTR owners they seem happy with the 6 Speed Getrag.
Supra's run the same box with over 1000bhp.
I rang up and got a quote for rebuilding my gearbox plus OS Giken internals and it was almost £5k with labour, the 6 Speed was much cheaper and having 6th Gear on the motorway means I can cruise at 100mph around 4k RPM and not use my turbo which saves me money in Fuel.
Give Hom @ MIJ Performance a ring, he has two R34 boxes, and one is going into a project car he's building so I'd get the other one before it gets sold as they are quite rare to find...
Cheers
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