I just looked it up online www.spicerparts.com/measuring.asp
your trans yoke and your diff yoke should be within 1 degree of each other, the link details how to check em

 

did not remove any tapered blocks,did not pull engine or trans,did not change torque conv. i got it in sep.09,the front spring were so bad,the top of the tire was even with the fender. i put stock heavy duty coil on it,and it picked the front up about 2 1/2 inches,but that is just back to stock height. everything in the front is new,accept the tie rods,centerlink,idlerarm,pitman arm, but i checked all that and it is good + i had it aligned,the shop said same all good. while i was at it i put a BORGESON steering shaft in[the one with the sm. u-joints instead of the junk dodge coupler. just dont know what it is. tomarrow i may stop by a good shop that has been in buisness for 49 years,they should be able to figure it out,im just about to give up. be out of commision for a while going for disk surgery tuesday. thank you for the info

 

ok im down to this:: my rear leaf springs sqeak when i bounce the back of the truck,they did not do this before,cant remember if they started to sqeak and the vibration/shake started or not. stock original rear spring,i put in rancho add-a-leaf,new u-bolts,new shocks,back in jan.2010,but did not have this problem then.
could it be my rear leaf springs???? are they weak?? what makes them sqeak?? the weakness would cause the pinion angle to change or no???
thank you

 

Forgive me if you mentioned it already, I just didn't want to go back ... what is it, four pages now. LOL Did your truck always have this vibration since you bought it or did you start to notice it at some point along the build? Just might help pinpoint it.

Also, just trying to think how the post started with the feeling that the vibration was up front and what would need balancing up front such as possibly the torque converter or vibration damper. Has anyone out there had this happen and know what it feels like or look for. Sure would hate for you to buy them just on a hunch. Have you had someone drive beside and behind you when this happens to see if anything looks odd or pinpoint a location.

Man, I know this has to be super frustrating. Hang in there Aje!

 

did the add-a-leaf raise the height at all?
something is starting a vibration at a certain rpm and the only thing it could be is a rotating part of some sort....maybe it was always there and one of your upgrades have magnified it....like Six said...you need to pinpoint it, when was it that is got bad? after all your front end work? after you replaced your tranny mount? (the reason I keep asking about the tranny mount is I changed my soft rubber tranny mount out and put a super hard, barely fit width wise, energy suspension urethane mount and I could feel more engine/trans. vibration in my seat and steering wheel....I had the truck for 10 years...I got to know every sound and feeling it ever made)

Did you take your leaf springs right out to put add-a-leaf in? there is a front and back to the leaf springs, the center bolt is not in the middle, it is off set closer to one end, also there is an "over curl" at one end of the leaf and an "under curl" at the opposite.....I mean where the leaf wraps around the bushing...It would be easy to put your springs in backwards and the "over/under" would change your pinion angle slightly but it would also push or pull your rearend depending on the offset of the centerbolt

 

everything was out of wack,when i bought it in sep 09. i felt a vibration then,and a clunk now and then. it was the trans mount,all the rubber in it was gone was resting on the crossmember. if i remember it had a small shake/vibration to it, i figured something would fix it at some poit in time.
i was going to change everything anyway,and i almost got the entir truck underneath new.
i did not remove the rear leafs,just loosend them disconnected the rear shackle and swung it down.
i was just thinking rear leafs cause they sqeak,could be weak??
im just wondering that for now,i may change them in the future.
someone had asked me about that i thought it was shake/vib. in the front. well it is so bad @65 its sweet spot,that the hood will shake back and forth against its hinges,that is why i thought it was in the front.
thank you

 

just got back from shop,they said to much axle end play,and weak rear springs..now what?? got to figure something out. thank you

 

dodge rear springs are notoriously weak, but they are not causing your vibration, so maybe replace when you can......
But there you have it....the rearend is causing your vibration ! did they say where the endplay was exactly ? do you have a clunk when you put it in reverse or drive at all?
sometimes what will happen is the pinion bearings or crush sleeve become loose and when you put it in gear the pinion gear teeth will "climb" up the teeth on the ring gear pulling or pushing the pinion.......
anyway you need to get the rearend checked out and repaired, you can search how to repair it online, I'm sure you will find some good step by step info if you decide to tackle it yourself....I know I would !

Good luck with the surgery and get well soon.

 

well i bit the bullet,i just came back. i dropped the truck off at one of the local dodge dealerships,let them figure it out.told them everything i did and found out. the shop i went to this morn said it is axle end play and weak spring causing my problem. i talked to another place that all they do is rebuild rears,they said that the end play would not cause my problem.
by the way,the shop i was at this morn said,about 2,800 for a new rear. that is why i took it to the dealer. that is a outrageous price,and other shops say that is not the problem, lots of crooks out there,be careful. about 2 days for the dealer to figure out what it is,and only 100 for a diagnose fee,not bad at all. then i will go from there. thank you

 

What rear end do you have?