RE: Need to make my Savage faster.
Well for one thing, if you keep those wheels and tires on for whatever racing your doing... You will lose... Unless his truck is setup and tuned so badly that it runs like crap.. I'm not sure what that F4.6 can pull, but I used to run 18/47 on my STS which was the tallest gearing I could fit in my truck, it hauled some major @$$ on the top end. Now on the Picco .28 I have, I'm running 18/49, and with the S-25 tires, it will wheelie the truck on demand in second gear (2WD) and the top speed is nice, any bump I hit the truck catches air...
So I'd say for the F4.6, 17/49 would be a good starting point (isnt that stock?).. Then theres 17/47, 18/49, 18/47, 19/49, etc.. Depending on how much gearing that engine can push, and if you can even fit the engine in there..