4r70w, 2.5 lift, driveline angles

[Pflyboy]

Okay, I searched for quite a bit and got a few half decent results, but I'm looking for a bit more...

For those of you with 2.5" of suspension lift and a 4r70w, how are your driveline angles? I'll be running 4.88s and want to make sure I absolutely don't need a high pinion gear setup (can you say $$$$).

What about the front driveline, as well? I heared there may or may not be issues.

Thanks for any help!

Nick

 

[Amac70]

you will probably have better results with a low pinion 44 then a hp one. With my d20 clocked all the way up and my hp 44 i just clear the pan and shift linkage on the the 4r with my custom 2inch driveline.

 

[broncnaz]

with only a 2.5in lift i dont see there being much issue. many people are running more lift than that with very little issue. nothing a shim cant take care of. As for the front drive line I dont see any issues there either as it will be longer than stock so angle is reduced.

 

[Broncobowsher]

I was running a 4R70W/D20 for years on 3.5" of lift. The rear axle needed the pinion shimmed up. But it ran for years that way and never an issue. It did need a torque arm. But the driveline ran nice and smooth. Grease it every few years and that was all it ever needed.

Front was about the same. But with the 7 degree bushings the front U-joint angle would vibrate a little when running highway speeds with the hubs locked. But that was a factor of the lift and bushings, and nothing to do with the transmission. It would have been the same if the 3-speed was still in it.

I also was careful to limit down travel so the CV could spin a full 360 degrees without binding at full droop. Even though you are looking at doing this with an inch less lift then I did remember that you may still have more down travel (and move the CV into a bind).

A 2.5" lift will be fine. That with the 4R70W is capable of having a good healthy driveline life if the other details are taken into account as well. And all done with a standard driveshaft, no high dollar high angle ones.

 

[Pflyboy]

I appreciate the input. One less thing to worry about. It seems there's a never-ending list with any auto project.