cromwell tools do a 360 degree gauge that has a magnetic foot , best way is to make sure the car/chassis is 100% level , set the axle first to 3 degrees up by setting the angle finder on the diff flange. then do the same to the gearbox , but 3 degrees down. pretty simple really.
cromwell tools link to said finder http://www.cromwell.co.uk/quicksearch?search=angle+finder
set car at ride as said, i then take my measurments from the manifold level left to right 3ish degrees down at the back, imo its not that critical as long as its close if anyone saw ancscious arnold id say he's car throws a lot of therorys out the window
it all depends on vehicle ride height too, the engine will usually be 3 degrees as this is the angle most intakes are cast at so carb is horizontal, if you are running a car low then the axle will be any where from horizontal up to 3 degrees, if you are setting up a truck with a lift kit or gasser style high rear end then these angles go out the window, as long as the two ends are not facing down (or both facing up!) then it will be ok . We set 99% of our axles on hotrods with no more than a 1/2 to 1 degree up and never get any vibrations, i think some of the big names in the usa have guides on their websites like strange and bears.
if i remember correctly its not vibration that your trying to eliminate with the correct angles , its to do with the roller bearings in the prop connectors , by putting the axle 3 degrees up and gearbox 3 degrees down , under normal running all the roller bearings or needle bearings in the prop unniversal joint are active under the same loadings and lubricated correctly. vibrations are down to unbalanced props. as stated earlier your vehicla must be at the correct final ride height , stance to be able to set it correctly.
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