So about a week or so ago i finally got an expo 8.8 and put it in. well thursday we hired a new tech at work, and he rebuilds trannys and axles. so i talked him into putting in my 4.56s. Truck works awesome now no struggle trying the push the 33's with 3.73s. my only problem on the way home, was i can feel the driveshaft wobble still. I replaced u-joints, and checked play on everything so now i know its my pinion angle. im just a little confused on how to find out my current angle, so i can get some degree shims on it. if someone can explain this in a retard form, so i can understand, that would be awesome thanks so much!

 

bump!

 

You didn't set your angle when you welded on the new spring perches??
did the drive shaft wobble before the expo swap?

 

i set it to the 6 degree angle that it said on trs wasnt thinking about it before i pulled the old one to check that angle and no it didnt wobble.

 

you didn't measure it when you had it under the truck? bad juju.
Get an angle finder and measure the angle, or just look at it and see how bad its off...if at all. i am not sure what else could be wrong.

 

i got an angle finder. this is where your gonna hate me lol. I am confused on how to get my overall angle so i know what shims im gonna need. i had a buddy help me do the 6 degree angle but hes outta town right now. so if you can explain it to a retard like me then i can go from there thanks alot man!

 

okay, i didn't readall of this, but it seems like a good site to read off of
Classic Broncos .com - Tech: Install Rear Axle Shims in a Ford 9" - 66-77 Early Ford Broncos

 

thanks so much man huge help that summed it all up for me!!!!!!!!!!

 

you're welcome no problem. It can be hard if you dont remember you trig days from high school, lol

 

did you fix it yet?

 

yes i did i was about 3 degrees off got some shims and now it rides amazing!!!!!!!

 

what is your fuel economy with 4:56s? and how many rpm at 70? im kind of thinkin about goin 4:10 TO 4:56

 

my tach is broke so im not sure about rpms and i havent really payed much attenion to gas mileage but i will start and let you know. all i know is it is fun as hell to drive around in lol