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Message: [QUOTE="Tree Trimmer, post: 632619, member: 716"] no, your thinking wrong, you need to do the math before the shaft, not after. take the engine rpm, divided by the final drive out of the transmission, should give you drive shaft rpm's. allowing 2500 engine rpm's 1. gear 3.11 ratio 803 shaft rpm's 2. 2.20 1136 shaft rpm's 3. 1.54 1623 shaft rpm's 4. 1.00 2500 shaft rpm's 5. 0.71 3521 shaft rpm's taking 5th gear to 3k engine makes it 4225 shaft rpm's so go floor your truck, see where you end up on 5 gear, and that will tell you what your shaft will turn. or, if you wind out 4 gear depending on your shifting strategy, your engine rpm's will tell you shaft speed. should help you determine your own driveshaft speed. [/QUOTE]

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