Ok. I'm done here. Yall have fun.
why can I just turn the engine or a bit > isn't that same resultCus to wiggle / turn the transmission to align the groves / spline on the input shaft and clutch disk…
It’s way way way way earlier to turn the transmission. Drop the drive line from the rear end. Like I said it’s the angle of the dangle.why can I just turn the engine or a bit > isn't that same result
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Maybe, maybe not...why can I just turn the engine or a bit > isn't that same result
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that is what I was going to do next.I would loosen the PP bolts, realign the disc and try again. The splined alignment tools are short and it's hard to see what you are doing holding the disc up and tightening bolts.

Frustrating, huh? I'm surprised that @RustyRatRod hasn't already signed out on this one.I always put all-thread diagonally into 2 of the bellhousing bolt holes to help align and take pressure off when pushing it forward. Get them through the trans bolt holes. Makes life easier if by yourself.
You have people that have been building and racing stuff for over 40 years making suggestions you have refused to try or accept as potential fixes. Why can't I just turn the engine. >>>>
What does jacking up the rear of the car have to do with this. The driveshaft still attached to the trans and rear end, rolling it all under the car as a unit?. Doesn't make sense. Nothing should be on the trans past the tailshaft/trunion.
PP loosening was another that I was going to suggest that JD has. Alignment tools are a rough shot sometimes. The all thread helps a ton with that too.
Good luck.
Real muscle cars.Real cars have 3 peddles….. some might disagree, well they lazy……
Oh he did like 20 post back…. OP has the trans in the car and is trying to slide the motor onto the trans. Going that route is like 2 monkeys Fing a football…Frustrating, huh? I'm surprised that @RustyRatRod hasn't already signed out on this one.
I see that now. So the OP is trying to install the engine into the engine bay and slide it back onto the transmission that is already in the car??? That is a backwards way to do it. If you read his first post, He says, "install this 273 onto a 4 speed trans". I assumed that it was just poorly written. I assumed he was trying to install a transmission the usual way. He didn't give us much information, did he?Oh he did like 20 post back…. OP has the trans in the car and is trying to slide the motor onto the trans. Going that route is like 2 monkeys Fing a football…
I see that now. So the OP is trying to install the engine into the engine bay and slide it back onto the transmission that is already in the car??? That is a backwards way to do it. If you read his first post, He says, "install this 273 onto a 4 speed trans". I assumed that it was just poorly written. I assumed he was trying to install a transmission the usual way. He didn't give us much information, did he?

not on a '65... that's why he's cornfused. Well, One of the reasons anyway...Both Auto and Manual use a slip yolk…
thanks for your help .. so turning the engine over by hand will not work? vs turning the output shaft in trans . isn't that the same result . not understanding.OK, @stroker402, I may be wrong, but I think you are missing the point of what @RustyRatRod, @Scody21 and others have told you. Let me try.
1. You said you used a clutch alignment tool. Did you install a new clutch and did it come with an alignment tool? If so, did you use that alignment tool? Is it possible that you have a misalignment between the number of splines on the transmission shaft and the clutch disc? That would certainly do it. The point I am trying to make is that you did not give us a lot of information, and we are wondering what is going on.
2 Assuming you have the right clutch disk for the transmission shaft and the alignment tool was correct and used properly, the transmission input shaft should slide in. I have installed a lot of manual transmissions, and they have just slid right in for me maybe 50% of the time. Sometimes it was a real pain. Here is what you need to do:
3. Make sure the transmission is sliding straight into the clutch disk and pilot bearing. If the transmission is tilted up/down or left/right, it will not slide in easily or at all. A transmission jack on wheels would be a big help. You might need a helper for the next step.
4. What the guys are saying is to put the transmission in gear and rotate the output shaft from the back. You could use an old transmission yoke or slide the driveshaft's front yoke into the transmission and wiggle it. This will be a lot easier with a helper. I wish I had a dollar for every time I was having trouble and then after wiggling/rotating the yoke on the back of the transmission a few degrees one way or the other, it slipped right in.
Bottom line is this: IF the splines on the transmission match, and IF you are sliding the transmission in straight (not tilted), and IF you wiggle/rotate the output shaft of the transmission a bit (by whatever method) the transmission WILL slip in.