Quote:
Originally Posted by racprops
Yes with the stock cam you were near the "lugging RPM/load...limits"
I had a TH400 with the switch pitch convertor which could have been great as it was tight, almost lockup tight in low but for all the power losses within the TH400. I did not have the knowledge nor the funding to change the rear end and re-calibrate the speedo...
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They sent us an SP2P manifold with the correct emissions crossover and the long runners to help low end torque. They also urged us to use their matching "Economy Cam" which would help low end power even more. However, the down time was too long for a vehicle that got daily use and it was never installed.
As it was, the California Emissions Laws changed to exclude any "tampering" even if the set up we had easily reduced the actual emissions by a large margin as proven on the bi-annual checks. There is a Cummins 6.7 sitting on the test stand that will have no use after we finish up tests. I think I can shove that thing in the van and put in a 6 speed 68Rfe and get 20 mpg +.