52 F1 driveline noise

[3twinridges]

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Guys got the 52 F1 out today to fill her up with gas. Really quiet and smooth ride considering the age of the truck. Plenty of good power, I can keep up with traffic very well.

One thing we are noticing is a chatter, almost sounds like something rubbing when under a load in 2nd or 3rd. Good example would be start from red light on flat ground. Sounds fine in 1st, sounds fine in second, rpms are high about to shift to third and then you come up a red light. So let off and start slowing, light turns green, so you hit gas, still in second, engine is trying to get caught up, that’s when you can hear it, if I shift to third without getting caught up in second noise is still there. It’s like a bearing noise either in the transmission or rear end. Once you get back on top and the truck is moving pretty good you don’t hear it.

It’s got 3.54 gears in it, and I wonder if it’s just an outcome of the taller gears, or if it’s a bearing issue in the transmission or a rear end issue.

This is a new build, rebuilt v8, rebuilt 3 speed, rebuilt d41 rear end except using 3.54 gears. Unsure of where to go to start trying to find the culprit.

JB