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Re: need help
You'll need all the parts necessary to conver the TH350 into a TH400, or you can buy a TH350 or TH700-R4/4L60 built for that level of torque from many shops and on-line vendors. It's hard to beat Moser for Saginaw 10-bolt performance parts. For driveshafts, you may be better off finding a local shop which specializes in custom driveshafts, since the eventual length will depend on the transmission and axle selection and chassis setup.
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