4" rear block shudder

[Dittmerdiesel]

Has anyone had an issue with shudder on take-off with a 4" tapered rear block? Im guessing all I need is a carrier bearing drop bracket but I was wondering if others dealt with the same. Its an extended cab long bed.

Thanks

 

[NotStock]

Does the block have a taper? Most of the time, I would recommend a flat block up to a 4-4.5" size. The wheel base on your truck is pretty short so a 2.5* taper may be better for your application. If the block is flat, you can purchase pinion shims to add angle or buy blocks with the taper built in.

 

[MINK]

It shouldnt be that bad - I would do traction bars before anything else.

 

[Dittmerdiesel]

NOTSTOCK-

yes they are tapered,

MINK-

Its not horrible, but Its enough to where I can definitely tell a difference. It's not a high power truck either, so do u think traction bars are necessary?

 

[NotStock]

Is the shudder under a heavy take off or does it happen even if you are light on the throttle?

 

[Dittmerdiesel]

A little bit of both actually. More so under heavy take-off.

 

[Karls03]

While I don't have any blocks, I do have 6" lift springs (makes for a 4 inch lift w/o blocks) and I had some pretty noticeable axle wrap/shudder under "normal" driving conditions. It was either the 3-5 or 5-6 gear shift that I could feel it under light throttle. However, a set of Pro Comp traction bars and that is all in the past now.

My point is, get some traction bars and your axle wrap/shudder should go away.

 

[MINK]

NOTSTOCK-

yes they are tapered,

MINK-

Its not horrible, but Its enough to where I can definitely tell a difference. It's not a high power truck either, so do u think traction bars are necessary?

I think they are a great addition to even a stock power level truck.

 

[woodduck97]

I had a shudder with 2 inch blocks. Put traction bars on and the shudder went away.

 

[Dittmerdiesel]

Well, that answers my question. I never had the issue with my 7.3 with the same block but it was a ccsb. Thats why I was wondering. Thanks alot guys.

Any suggestions on bars that won't break the bank?

 

[Karls03]

http://www.sdtrucksprings.com/index.php?main_page=product_info&products_id=6706

If I were on stock springs, I would have tried these. My lift springs would have dictated some modification to raise the mount over the axle. The bar looks small but remember, it's harder to pull a bar apart than it is to taco it.

 

[Dittmerdiesel]

Ive never seen a system like that. Looks like it might be a problem with my factory overloads though.

 

[Karls03]

That's a definite possibility, my lift springs don't have the over load. If you get the Pro Comp bars, they are two separate kits, the mounts and the bars.

http://www.summitracing.com/parts/exp-72099b/overview/make/ford/model/f-250-super-duty

http://www.summitracing.com/parts/exp-72400b/overview/make/ford/model/f-250-super-duty

Aside from price, I liked that these mount close to the axle centerline, not below (ie Rough Country). Mounting below the axle will make the mounting bracket a torque arm increasing the pressure on the bars. I really like how OUO looked, but man are they pricey.