The local tranny shop said " thats suposed to spin free look at every other gear. it dosent make since that it would be pressed on." I just re read the TM and it says to press it on to the main shaft. Stupid tranny shop.
So they are the stupid ones... aha, really...?
Get THE tranny book: TM9-2520-246-34. Go to table 3-2 on page 59.
There you will find all size and fit dimensions / wear limits & tolerances for the mainshaft assembly... Line 19 shows L - P = 0.0035L to 0.0045L. That is 2nd gear I.D. less shaft journal diameter, min. and max. dims. respectively.
That in fact IS a
loose fit; not snug, not tight, not pressed on!
And if there wasn't (at least) that much play the new gear would very soon weld to the shaft again!
Disassemble that MS and sure enough you will find what is wrong.
G.