One of 3 things is happening:
1) You are imagining it. I doubt this, but it sometimes happens. Drive another Ranger to compare.
2) Your engine is not vibrating more, but the vibration is reaching you more efficiently.
Check engine and gearbox mountings.
If you only get the vibration while driving- check propshaft.
3) Your engine is vibrating more. This could be caused by mechanical parts wearing out or going out of balance, but more likely to be one or more cylinders not working 100%.
How is the power output? If down, look @ injectors, then do a compression test.
Does it only vibrate when cold? If yes, check glowplugs.
Does it still vibrate with the clutch depressed? If no, the problem is in your clutch or gearbox.
Is there extra noise? If all above is ok, have a mechanic listen, but expect engine repairs to follow. Probably bearings.
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