Ok well I just got my truck rolling after a slight amount of work.
New frame, brakes, diffs, gears, new one piece drive shaft, 4" spring lift/shocks(pro-comp) and new 5.5" heavy shackles.

Now the problem I have is when the truck hits approx 30km/h(20 miles) it starts to shudder, but evens out and runs smooth once I get above 33ish. I am not sure if the rear shaft was balanced when I had it cut down an so am wondering if that?

Or if my rear diff/driveshaft axle angle is too straight. With the shims that came with the kit the drive shaft/diff angle is pretty close to straight... could this be it?

Or if anybody has any other brilliant ideas please let me know, I wanna take this puppy wheeling next week.

Kirby

 

Did you mess with the tranny at all? Maybe its only a particular gear doing the shuddering? You say between 20mph and 33mph so maybe its 3rd gear being weird?

 

It doesn't matter what gear, its seems to do it more if I am turning to the left? I removed the shims from my springs to increase my angle from diff/drive shaft and that seemed to help but didn't cure it. Can the diff angle cause a pretty good vibration? Its bad enough that the change in my ash tray bounces around pretty good.

I pulled the engine/tranny and dropped it straight in to the new frame. It starts at about 20 miles and hour and smooths out the faster I go. I'm just worried its gonna cause me to blow a diff??

Any advice is much appreciated I am suppose to go for a back country trip and don't wanna take the truck if its acting up like this.

I am gonna pull the rear drive shaft and see if it goes away tomorrow. If thats the cause, I'll have at least located the problem.

Kirby

 

Rear driveshaft angle is the issue, shimming it like you did is what needs to be played with.

 

Ya, I kinda figured(and hoped) that, I put in reverse shims today, gonna try to take it for a test drive on Thursday.

Kirby