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Axle Wrap/Hop

stockk5

stockk5

1/2 ton status
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Hey guys, i got some horrrrrible axle wrap/hop. I Have a dana 60 rear, w/ a detriot 4:56gears, pinion bearing is quite loose... a home made shakle flip and 2" blocks. The shackle flip is just the stock bracket that i cut a hole in and dropped down the shackle then re-enforced the top. Stock k5 springs. The pinion angle allows the driveshaft and pinion to line up basically in a dead straight line. Oh yeah i have the 37" humvee tires, radials,, If my truck starts to break loose on pavement or anything i get horrible axle wrap/hop, its almost at the instant the tires start to spin my truck just jumps up and down violently until i hit the brakes.. which i do.

Here is what i mean about my driveshaft..
DSC00542.jpg


shackle angle
DSC01275.jpg

 
yeah i figured that.. i was more trying to figure out why, is it cuz of the shackle flip? or pinion angle? my bro has 6" all spring lift and a stock 3/4 14bolt and he gets no hop.
 
I would say it is because of the blocks. They let the axle have more leverage on the spring which makes it easier to wrap. The hop is when the spring binds then releases.

Ira
 
it's because of the blocks more than anything. my truck didn't have any hop with a shackle flip and a very similar ujoint angle, but no blocks.
 
many moons ago i had a 86 toyota with 35x14.5 mickeys. I put a set of rancho torque bars on it mainly cause they looked cool.
I was blown away. It was like i pulled the 4 banger out and dropped a V6 in the truck. I never realized how much horsepower was being sucked up by axle wrap until i put those bars on.
I am currently running 39x18 mickeys on my blazer and torque bars are already in my future plans. I think they are a "must have".
 
stockk5 said:
yeah i figured that.. i was more trying to figure out why, is it cuz of the shackle flip? or pinion angle? my bro has 6" all spring lift and a stock 3/4 14bolt and he gets no hop.
Click to expand...

6" springs are very stiff, so they help eliminate wrap. That, along with your blocks, like everybody else said, is the biggest difference.

On a separate note, it may be just the way the picture is taken, but your pinion angle almost looks TOO high. It looks like the angle is actually negative, which would get even worse when the axle wraps up. If there's angle built into those blocks, it's not helping you out any.

I would suggest either some sort of anti-wrap bar(s), as previously mentioned, or even better would be a good set of 2" springs. Yours look pretty worn out.
 
goldwing2000 said:
On a separate note, it may be just the way the picture is taken, but your pinion angle almost looks TOO high. It looks like the angle is actually negative, which would get even worse when the axle wraps up. If there's angle built into those blocks, it's not helping you out any.
Click to expand...

i see that too, idk if its the pic or not but it does look too hight. only a small fraction though. idk if this helps but i found some degree shims on jackit.com

http://www.jackit.com/springs/degree_shims.htm

and they are pretty cheap too.
 
Blocks plus crappy springs. I would suggest builting an anti-wrap bar. Do a search youll find some peoples home made stuff
 
So would these work:

sum-770501.jpg



Or do you need to have the "Wraptor"?
 
Chevy305 said:
So would these work:

sum-770501.jpg



Or do you need to have the "Wraptor"?
Click to expand...
Those work if your axle doesn't really articulate i.e. it won't work if you offroad your truck at all. It will severly limit articulation (flex).

That style traction bar works *ok* for street driven vehicles.
 
stockk5 said:
pinion bearing is quite loose...
Click to expand...

This may be a big part of your problem. If the pinion is walking around it could greatly exaggerate the wheel hop issues.

The other possible problem is that the driveshaft yokes are binding due to the pinion angle. The pinion at the diff looks like it's too far upwards, and the natural movement when you apply power will make the pinion point even further upwards. Have you verified there are no metal to metal contact marks on the driveshaft yokes?

I ran stock K5 rear springs with a 4" block for years with 33, 35, and 38" tires and never had any noticable axle hop issues. The only time it was an issue was after swapping in the 14-bolt rear and I did not have the shock mounts welded on yet.....any more than mild throttle caused serious axle hop. After getting the shocks installed it was no longer noticable.
 
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