Exactly what parts were replaced during the rebuild? It sounds like a band or a clutch is engaging or partially engaging when it should not be. Did you remove / replace the gasket under the aluminum plate that the valve body sits on. I could see how a leak under the plate could cause something line this.

__________________
I got too many cars!! Insurance eats me alive. Dave

78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k