trans go jr
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650 RWHP.. Yup Id get a suncoast IV for sure on that HP. There is a few other options too that are top shelf like Ingelwood in Cali. I limped a 5 speed LLY with BD set at 70hp one time with 2 sleds on the back. The 4-5 shift was the killa. The 6 speed no prob but anything past 4th at WFO with 100hp over watch it..
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It wont be a waste of money, With the Suncoast IV it comes with the kit so just one less thing to install then. So your alking bout 450 RWHP,I think stock is bout 300 or so. I ran my with the Trans Jr with level 4 on the PPE, which is supposed to be 225 Eng HP. I never did limp it but did watch the 5-6 WFO shifts. When we installed the SC IV there was signs of the wear..