Transmission wont mate with engine

[Prof_Finesser]

Hi everyone I recently built my r32 rb25de and was putting on the transmission and cant seem to get it on all the way.  I'm using an action clutch kit and flywheel.  I had the alignment tool in when installing as well.  I put the trans on and it feels like its in also when I spin the crank it does spin the trans so I'm not too sure what to do.  Going to try and take off the PP and reinstall it.  Maybe the clutch isn't aligned right.  Any suggestions help.  Also its a normal single disk clutch.

[GTSBoy]

Have you tried the simple expedient of rotating* the whole gearbox a little to engage the splines properly?

* a little clockwise, a little anti-clockwise, wiggle and jiggle at the same time.

[The Bogan]

Some clutch alignment tools are better than others

Start to tighten down the plate until it just holds, then wobble the alignment tool to center the plate, clutch and flywheel, then tighten it up to spec

If you just put the alignment tool in and tighten it up they sometimes don't align correctly because the plate is hanging a little low creating an angle

[Neostead2000]

I had issue with this also the other day when I was attaching the gearbox to the motor. What did the trick was a bit of grease (not much) on the tip of the input shaft so it goes in nice into the pilot bushing, after the tranny was slightly in and making contact with the clutch plate (confirmed by rotating everything), I took a big block of wood, positioned it at the tail end and started whacking it with a big hammer. Surely enough, it started going in. Then I threaded in the 4 long bolts just a bit and kept hitting it and threading the bolts until the trans went flush with the dowel pins. Of course had to make sure the gearbox was aligned good when hitting it from the back, it was 2 of us doing it.

[Prof_Finesser]

I got it mated and the engine is back in the car what helped me was i had the trans sort of connected and it was on the ground so I sat down and put the feet on both sides of the trans and pushed it in.  Thank you guys for the info and suggestions.