Quote:
Originally Posted by 30 Closed Cab PU
Hi John,
Thanks for the info you provided.
I assume I have the 4.1, since I struggle to keep up with others. It is not happy/smooth at 40 and above, vibration, sounds busy.
I am hoping others can definitively confirm where my motor is at 2200 RPM. The motor had a recent head gasket and valve job, the lower end condition is unknown. Babbitt's/rods/etc. work is expensive to have done.
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Since "the lower end condition is unknown", it might be a good idea to drop the pan and check bearing clearances. This only involves the cost of a pan gasket, and time. Removing some shims now (if needed) will greatly extend bearing life.
If your rig is not happy nor smooth above 40, you may need to do some routine maintenance, or repair. Wheel balance, tires out of round, worn bearings in diff or trans, fan out of balance, or even a poor quality engine rebuild by a prior owner.