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New noises after lift/axle swap.

colbystephens

colbystephens

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Originally, truck was 350/700/241/10B w/ 3.42s on 33" tires.
Now, truck is 350/700/241/14B w/ 5.13s on 38" tires.

The gears are brand spankin new - they now have about 4 miles on them. They've got 6 thousandths of backlash.

Noise #1: When the slowing down with the transmission selector in Overdrive, the down shift to first gear make a louder noise. I haven't done anything to the transmission except add a tranny cooler (months ago), and I know the TV cable is operating properly, and the fluid is full. The gears I got are USA Standard gear, which are supposed to be noisier, but I **assume** that means at speed. The noise seems to come from the rear, so I'm wondering if it's just louder gears. Perhaps the lower gearing provides more force to be pushed against in a down shift, causing the louder "slap." ??? Ideas on this one?

Noise #2: When turning the steering wheel and not moving, I'm hearing some popping, kind of like the sound of sheet metal changing shape a bit when you're flexing out your suspension as the body twists. I now have a Dana 60 with crossover. I have a frame brace. Frame isn't cracked. I'm suspicious that it might be just the new grippy Swamper tires on the ground, but haven't had the opportunity to have my wife turn the wheel while I listen. Sound seems to come more from the passenger side, but I don't think it's specific to that side. Ideas?

Thanks!
 
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Colby, I had a similar popping noise coming from my truck doing the same thing. Are your drag link ends greased? Thats what mine turned out to be. It was a popping noise and I checked everything, and it turned out to be the boot had no grease in it. Might be worth it just to check that from the start.
 
I am having trouble with my grease gun, and I do believe my joints are under-greased. Plan is to just pay the $5 to have all the zerks hit first thing next week (not driving the truck again till then.) So, hopefully that will fix it.
 
have someone turn the wheel while you watch, I bet something is moving around up there that is making that noise. My rivets in the front crossmember were loose and they would pop like that when i turned the wheel, as well as teh frame flexing and that was with a brace as well
 
I'll double check the u-bolts, but I did torque them all to spec. If I recall right off the top of my head, it was 150 lb-ft or so. Sound right?
 
If you get a chance to look while somebody else turns the wheel watch the shackle hanger area too. My Factory shackle hanger bushings were shot and they would pop.
 
Great tip. Thanks! That sounds plausible because the truck has 200180 miles on it. :yikes:
 
Yeah, I had bushings that were completely gone and the bolts had began eating into the actually bushing mounts on my 1982 K30 3+3. It made a weird popping noise while braking (and at other times). I just installed an ORD FUSH kit. I had a buddy at the same time with a short box, and his had the same symptoms and problem.

Martin
 
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