Lightning, Harley-Davidson F-150, Roush F-150 & Saleen F-150SVT Ford F150 Lightning, Roush, Saleen and other performance F150's
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I drive my L everyday with the 4.10's and havent seen any problems for almost a year now. Mileage decrease was very little. Maybe a mile to the gallon, if that. Makes for some serious fun at the stoplights tho...
4:10's are too much for these trucks. It's like using a 26" tall tire rather than a 28" tall but more extreme. You want to keep the revs lower where it is still making power.
From my other post about the 26" tall tires
Originally Posted by yysenhimer
I've tried 26" tall ET Streets and lost mph with them every single time. My 60' times were just as good with the F1's (Low 1.8's). I then did a dyno comparison between 28" tall F1's and 26" tall ET Streets. The results I got back in March of '03 were:
F1's: 447.2 RWHP, 576.5 RWTQ
ET Streets (26" X 11.5): 429.5 RWHP, 544.2 RWTQ
I switched to Hoosier Quick Time Pro's and the mph went right back where it should be, and the 60' times dropped into the 1.7's first time out.
Here is the dyno sheet from when my truck was making less power about a year and a half ago. F1's are run 7 and 26" tall ET STreets are run 10.
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