Re: 89 GMC Cummins conversion
Mike- I tried you tune and it shifted into 4th sooner but would not unlock the converter for a longer time frame than it should. I was able to tweak Dawna's tune to where it shifts like it should now. It could use a little more fine tuning but it will have to wait for now. We got a couple of inches of moisture last week so everything is in full bloom so I have some yard work to do and a few other projects that need my attention.
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1987 GMC R2500 SC 454 T400
1988 Chevy R30 CC DRW 12 valve Cummins NV4500 GearVendors
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