Originally Posted by 99RangerXLT
Don't worry about the paint throwing your driveshaft out of balance. My work also has a driveline division ( we make OEM shafts, quite possiably the ones on your truck, as well as for Spicer)
We paint our shafts after we balance them all day long. If you think about it when you paint it's only a few microns thick. You would need a whole lot of paint to amount to any kinda of weight imbalance.
But as for the rust a steel shaft is at leat 1/8" thick at minimum. You would need alot of rust to weaken the shaft.
My only concern is that Rangers are known to be prone to driveshaft vibration problems. The reason for the 93mph speed limiter is a limitation in the driveshaft! I don't doubt that the effect is minimal, but if you have a driveshaft that may already be slightly out of spec (I had mine rebalanced to solve a vibration, although I don't think I lost a weight,) painting it might make it worse instead of better. If the concern is purely cosmetic, rust converter is easier than painting anyway, you can just rub it on with a rag.