My 90 2wd Cummins has got an estimated 23- 24 highway. I say estimated because the Speedo is about 5% off and odometer about 9. That's at 70 with the original or oe- replacement slipmaster converter and 3 speed auto. I'm sure it could hit 25 with a good converter. It's not a rocket sled but fast enough for me. The bossman's 6.7 Cummins is scary fast.
These big-horse isx at work will get 5-5.5, if you drive it right. If you don't they will still get the 2-2.5 they did before deletes.
The old freightshaker won't get out and run with them but the 400 hp N14, 10 direct 2.64 gears will get 5.5-6. I expect that to improve when the boss gets back with my new shocks, so my drive tires stay on the road better.
I'm going to try to talk him into an rtlo 13 speed and 3.36s when we do an in-frame. Give me the same final ratio in top gear, which is a compromise for the work we do, but it would drop my crawl ratio from the current 39:1 to 45:1 and let me keep my rpm down on the high side.
That's the big thing with these big engines. Lug them. The C15 and isx are just blowing fuel out the stack over 1500 rpm. They still pull good but you can just about hear the fuel tank vents sucking in the air.
And I wouldn't run one of these 13 speed isx powered Pete's without a governor. They can get you in trouble in a hurry.
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