When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I have a '79 F250 camper special 2wd. Everything on the truck is brand new. Just finished a restoration. But I have a vibration, which started as a out of round tire, so I got that fixed and the vibration decreased a lot. But there's still a vibration at highway speed, enough to shake the seat back and I can see the hood move but it feels like it's from the rear end. It has new bearings and seals, new tires, new steady bearing. The driveshaft is Aliigned properly. What do you think it could be? A couple people have said it could be the steady bearing, but I just replaced it? Any other ideas?
A balance job at a good tire shop will include check of any wheel or tire issues including wheel wobble or out of round. Inspection is often visual by an experienced tech but it makes a difference. My '79 runs smooth after 2'nd balance at a 2'nd shop. My It may be worth a second round of balance.
On way to diagnose is to swap wheels/tires front and rear. If the vibration follows the wheel/tire, good chance that is the problem.
Also would not hurt to jack it up and check for any slop in rear wheel bearings or excess axle end play. Front also.
A balance job at a good tire shop will include check of any wheel or tire issues including wheel wobble or out of round. Inspection is often visual by an experienced tech but it makes a difference. My '79 runs smooth after 2'nd balance at a 2'nd shop. My It may be worth a second round of balance.
On way to diagnose is to swap wheels/tires front and rear. If the vibration follows the wheel/tire, good chance that is the problem.
Also would not hurt to jack it up and check for any slop in rear wheel bearings or excess axle end play. Front also.
I have exhausted the wheel/rim balancing issue. I have got 3 new tires (one was out of round) I bought a new rim, and have got them all balanced 4 times now, including a rode force balance. I'm certain it's not in the wheels. The steady bearing has got me curious.
This may come off as stupid.. But on my '79 it had a clip with a bolt attached to the upper side and that's what the bolt screwed into so you didn't have to use a wrench. Mine was damaged and bent, so I took it out and just used a regular lock nut and bolt, but the other side has the factory clip/nut combo...
I wonder if the 1/32 (or whatever the clip thickness is) on one side but not the other could be my issue...?
^^^ YES ... the shafts need to be properly aligned , or vibration will result from improper alignment .
Also on the tire balance thought ... I see " modern " tire balance equipment fail often on this type of issue . I did tire work 20 years ago . A trained eye catches issues that the newer " high Tech " machines fail to find .
I have seen cars with your complaint with 5 oz of weights on a front rim ! Something is wrong with that much weight in one spot .
So what about you rear axle (pinion) bearing did you replace it to?
Yes x2 on the d/s "phasing" or alignment being very important, especially on a SC.
"Shimming" means when you use a piece of metal to drop or space the carrier bearing (steady bearing as you call it) down from the cross member a bit to make the d/s line straighter, mostly needed when you lift a 4x4 SC.
Have you inspected the complete d/s for a missing balance weight looks like a small rectangle riveted or tacked on. Look for a spot that looks different in color.
Motor mounts good, trans mounts good?
At what speed does the vibration start and does it stay the same amount with speed increase?
Could also be your drive line yokes or the spline shafts if they weren't replaced they can get some play in them. Will result in a phasing vibration (comes and goes at different speeds)
So what about you rear axle (pinion) bearing did you replace it to?
Yes x2 on the d/s "phasing" or alignment being very important, especially on a SC.
"Shimming" means when you use a piece of metal to drop or space the carrier bearing (steady bearing as you call it) down from the cross member a bit to make the d/s line straighter, mostly needed when you lift a 4x4 SC.
Have you inspected the complete d/s for a missing balance weight looks like a small rectangle riveted or tacked on. Look for a spot that looks different in color.
Motor mounts good, trans mounts good?
At what speed does the vibration start and does it stay the same amount with speed increase?
I'm going to crawl under there today and check my d/s for all these points. I did change the tire size by a couple inches. Enough to throw the speedo out. Maybe that change is enough to change that angle. I checked for missing weights, but didn't see any. Thanks for all the help guys!
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.
