75 K10 Engine ran in other truck,gets caught up turning in this one. HELP PLEASE

[Hillbillydrums]

Hey guys. I'm getting pretty aggravated at this point, so lets just jump into it.  sbc 350, th350
About a year ago I bought my 75 k10. When being turned over, it would get a little stuck in places, and then free up, then again. My dad and I assumed something in the engine was stuck.
Recently, I bought a 76, for the engine that I know runs, and for some other parts.
Just put the engine in this week, and now it does the same thing! It does do full revolutions, it doesn't just hit a wall.
I even ended up unbolting the torque converter and it still does the same thing.
I have another tranny that i think is good. Do i have to swap them? If so, how do i?
Thanks in advance.
http://youtu.be/wxWudF-dmQ8
http://youtu.be/qqIu3ddgyk8

Videos of it trying to turn.

[Turbostang7]

Looks like the starter is weak or the battery needs charged, if you unhooked the torque converter and it still does it then it's not in he tranny.

[zieg85]

A low CCA battery/weak and/or corroded (inside the insulation) would also cause this assuming your timing is set correctly.

[fitz]

These guys are pointing you in the right direction.
With a fully charged battery try using some jumper cables to go from (+) to you starter and (-) to you engine block. This should let you know if your cables are bad. Like Zieg pointed out, they corode from the inside.

[bake74]

These guys are pointing you in the right direction.
With a fully charged battery try using some jumper cables to go from (+) to you starter and (-) to you engine block. This should let you know if your cables are bad. Like Zieg pointed out, they corode from the inside.

     X2 on what everyone said.

[thefarmboy21]

Is it doing this by hand or from the key? If from key, it could also be a bad switch OR knocked out of time. If it's binding up by hand then you're doing something wrong.

[Hillbillydrums]

Looks like the starter is weak or the battery needs charged, if you unhooked the torque converter and it still does it then it's not in he tranny.

Exactly what I thought. I have 3 different starters, one almost new. Tried them all. Charged the battery to make sure. Even left it on the charger and tried it's few times.

A low CCA battery/weak and/or corroded (inside the insulation) would also cause this assuming your timing is set correctly.

The distributer isn't in. I just put the engine and wanted to turn it over. But it gets caught.

These guys are pointing you in the right direction.
With a fully charged battery try using some jumper cables to go from (+) to you starter and (-) to you engine block. This should let you know if your cables are bad. Like Zieg pointed out, they corode from the inside.

I'll try this when I'm home.

Is it doing this by hand or from the key? If from key, it could also be a bad switch OR knocked out of time. If it's binding up by hand then you're doing something wrong.

it does if from the key, and then I made a starter switch going from the terminal of the starter to the battery to be able to troubleshoot while alone.

[bake74]

     At this point I would try 2 different things, like Zeig said, try to isolate the battery cables themselves to make sure they are good or bad.  Then turn it over by hand to make sure it is not something internal with your engine.
     Keep us posted.

[Hillbillydrums]

     At this point I would try 2 different things, like Zeig said, try to isolate the battery cables themselves to make sure they are good or bad.  Then turn it over by hand to make sure it is not something internal with your engine.
     Keep us posted.

I had the engine in other truck a few weeks ago. Started right up. Ran great. 

And the prior engine that was in it did the same thing. I figured bad engine, so I got this one.

[zieg85]

OK you said you had the engine in the other truck, ran great.  When you put it in this one did you use the same cables from the other truck?

[VileZambonie]

You do not have the ground cable connected to the engine.

[bd]

You do not have the ground cable connected to the engine.

X2 on this.  What gauge are the battery cables and where are they connected?  Do you have a voltmeter?

[Hillbillydrums]

You do not have the ground cable connected to the engine.

Holy shoot.

It was that simple.

[rich weyand]

Yup.  Couple 2-3 times a month, it's bad starter cables or improperly connected grounds.