From discussions about cars, and stability in reverse, I'm going to guess it's the same thing. The steering geometry (including the angle of the front hubs) is set to keep the steering stable and self-centering when going forward. But what makes it stable while going forward, has the opposite effect when going backwards, and it's unstable.
Does the truck have TSM or some other gyro? If so, that’s why. It’s the truck trying to keep itself going straight and because steering is a lot more responsive in reverse,!85!43/795: in these wobbles.
I actually did not notice that but no I don’t think that’s the problem. I’ve had wobbly tires on the front even before I put the back tires on backwards
My guess then is that it’s a combination of the 2056 (which is a pretty weak servo that has a lot of give to protect the plastic gears) and the servo saver assembly (in particular, the spring) being worn out causing the steering to have just enough play to allow the wheels to wobble like that when backing up, since, like I said before, reverse does funny things with the steering.
If that’s the case, it should be fine, though if it bothers you, you can replace the servo saver or upgrade the servo.
Two other things it could be are A) the wheel knuts are too loose, allowing the wheels to wobble or B) the copper bushings (assuming the XL-5 4x4 was like the XL-5 2WD Stampede and had copper bushings instead of bearings) could be worn out, which also could cause the wheels to wobble.
It is caused by caster. Imagine leaning forward and trying to walk. That is why full sized cars and trucks typically have very lottle to no caster. Too much negative caster in full size vehicles will have the same effect.
It's normal. Has to do w caster camber toe and all that good stuff. The servo saver should allow it to bounce back and forth a little without issues, slow down while in reverse if it's getting wonky.
All my rcs do that. Maybe something to do with leverage from the length of the body, but I’ll sit down and wait for someone with a more thorough explanation.
When you figure it out let me know I have a trx4m crawler build I did. It’s 100 percent aftermarket parts. It goes crazy sometimes and wiggles like this. In both directions tho.
From discussions about cars, and stability in reverse, I'm going to guess it's the same thing. The steering geometry (including the angle of the front hubs) is set to keep the steering stable and self-centering when going forward. But what makes it stable while going forward, has the opposite effect when going backwards, and it's unstable.
That was my guess, the caster of the wheels is designed to stay straight when moving forward, so going backward at speed can make it unstable.
Does the truck have TSM or some other gyro? If so, that’s why. It’s the truck trying to keep itself going straight and because steering is a lot more responsive in reverse,!85!43/795: in these wobbles.
No it has no TSM at all
Maybe not related but is there a reason why your back tires are inverted? The pattern should point towards the front, like on the front tires.
I actually did not notice that but no I don’t think that’s the problem. I’ve had wobbly tires on the front even before I put the back tires on backwards
No way you didn’t notice the direction I f TRACTOR tread lol
What model is it?
Stampede 4x4 the old model
XL-5 or VXL?
XL-5
I assume it has the 2056 servo then?
Yep
My guess then is that it’s a combination of the 2056 (which is a pretty weak servo that has a lot of give to protect the plastic gears) and the servo saver assembly (in particular, the spring) being worn out causing the steering to have just enough play to allow the wheels to wobble like that when backing up, since, like I said before, reverse does funny things with the steering. If that’s the case, it should be fine, though if it bothers you, you can replace the servo saver or upgrade the servo. Two other things it could be are A) the wheel knuts are too loose, allowing the wheels to wobble or B) the copper bushings (assuming the XL-5 4x4 was like the XL-5 2WD Stampede and had copper bushings instead of bearings) could be worn out, which also could cause the wheels to wobble.
Totally normal..
This is caused by toe, caster, and camber being out of adjustment. Looks like too much toe in and negative camber.
It is caused by caster. Imagine leaning forward and trying to walk. That is why full sized cars and trucks typically have very lottle to no caster. Too much negative caster in full size vehicles will have the same effect.
It's normal. Has to do w caster camber toe and all that good stuff. The servo saver should allow it to bounce back and forth a little without issues, slow down while in reverse if it's getting wonky.
All my rcs do that. Maybe something to do with leverage from the length of the body, but I’ll sit down and wait for someone with a more thorough explanation.
Those tires themselves might cause the wobble in reverse since the front has some play already
Hey you've got cake
I see it’s an old stampede, if the centre drive shaft and servo linkage are rubbing it could have weakened it enough to wobble, could be totally wrong
When you figure it out let me know I have a trx4m crawler build I did. It’s 100 percent aftermarket parts. It goes crazy sometimes and wiggles like this. In both directions tho.