Is my Transmssion good. Shep trans

[AWDfrank]

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I put a used transmission into my car ( 1990 plymouth laser rs-t ). The transmission was said to be in perfect condition. When i installed it right away 1st was totally out, 3rd popped out of gear and 5th would grind and pop out when it wasn't put in gear perfectly. It is also really loud when i shift gears, not a grind but a noise of like parts moving around, maybe shift linkage.

Question: Is it possible that the shift linkage on the transmission is just set up wrong as in missing a washer somewhere? or Is the transmission just crap, or could it be that i need a different gear oil?

Is it worth buying a shepard racing stage 1 rebuild or should i just find a used transmission?

 

[93GSX4me]

Did you make sure it not only bolted up , but was the correct spline ? There's quite a few different DSM trannys

 

[AWDfrank]

no i didn't check, the new transmssion looks different on the top part.