Quote:
Originally Posted by Dalaigh
Picked up this straight and solid, but needs TLC C3500 today.
Plan is to build a clean work truck. It's a 98 w/ 454/4l80e.
I don't have a jack that will lift the back to figure the gear ratio out, but does anyone know how to find (guestimate) gear ratio off of speed, RPM and tire size?
With the factory 225/75r16 at 90km/h the truck is running down the road at near 4000RPM. This seems high to me, and it's going into OD.
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Something is definitely wrong with that. Shouldn't see more than about 2500 RPMs in overdrive at highway speeds. 4k at 55 mph is like second gear!
Let us know what you find...
My set up below runs under 2000 rpms at 70 mph or 112 kph