Sounds like a great project. I put a manual valve body th400 trans and a Gear Vendors overdrive in my '86 Vette. The Gear Vendors is great. It drops my rpm's about 500 when the th400 is in 3rd (1 to 1). I've got a 3.07 rear diff. The guys at Gear Vendors were great to deal with and very knowledgeable. For sure give them a call and ask to talk to a tech and explain your setup and see what they say. I'm glad you've joined the forum. This build has lots to look forward to.
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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