With 3.73 and QT with O/D my J4000 needed a throttle push to hold 70 until I went 33" tires.Stuka wrote:I always start with wearable items. Tune up, brakes, etc. going through these are the first step towards getting it into DD duty.
Sounds like you most likely have the optional 4.10's. 3.73's were standard, which you may have as well.
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