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need some ideas on how to aline the engine transmission to the rear end,, i have a couple, but the brain trust here might have some more..( this is for my ecotec w/c t5 transmission build,, getting ready to install soon... thank you
 

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Never done this but you could get a cheap laser and mount it on diff end or vise versa and see if the drive shaft goes strait from diff to box. A degree wheel would also help as far as slope.
 

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make an adapter from the driveshaft output yoke on the gearbox that has hole for a cheap laser (as mentioned above). Can be made from wood, or 3d printed or something like that.
then print a circular target on a piece of paper, glue that to some cardboard and align the center of that target with the center of the diff input yoke.
 

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As above, but add rotate the motor a small amount and make another mark where the laser lands, then repeat several times, and you will likely end up with a circle due to the laser not being perfectly aligned with the shaft centre. The centre of the scribed circle is your current alignment.
 

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Perfect alignment is not needed or wanted. The universals need a 1-2 degree misalignment (movement) to keep the needles lubricated. Typically the differential is pointed down relatively to the drive shaft as the nose will rise when power is applied.
 
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