3020 syncro help?

So I have the top shaft out of this 3020 and was looking for all of the wear points that would cause it to jump out of high range. Dealer does not have a new shifter that I could measure. Part AR77821. Anyone know what it should measure were it fits over the syncro's? Mine is 1.882. Thanks

No need to measure... you can see wear step.
Drums, synchronizers and shifters will need
replacing.
Too many people try to get by with just
replacing a few parts only to have to tear
tear tractors down again.

Like D stated you can tell by looking and chances are strong that you will need them,, if they are worn it will not tuck the shift into place, here is a basic parts list for what you will need,,I used A&I parts where I could it will save you about $300,you should look at the trans pump too while you have it on the bench.this did not transfer well, Darn it



Part No.
Description Availability Comments Unit Price* Total Price* Hold
Delete

A-R31026 Brake Drum - DRUM, LOW/HIGH RANGE ADD 116.67 USD 233.34 USD
A-R52499 Brake Drum - DRUM, REVERSE RANGE ADD 102.08 USD 102.08 USD
A-R27727 Plate - PLATE,PART OF KIT RE37119 ADD 6.25 USD 18.75 USD
A-R33480 Shift Collar - COLLAR, SHIFT ADD 101.04 USD 101.04 USD
A-R33383 Shift Collar - SHIFT COLLAR ADD 81.25 USD 81.25 USD
R59860
Spring - SPRING ADD 1.17 USD 9.36 USD
A4742R
Ball - BALL, STEEL ADD 1.40 USD 11.20 USD
AR77821
Shifter - SHIFTER, LO AND HIGH RANGE,W/ROLLER ADD 432.79 USD 432.79 USD
AR32191
Shifter - SHIFTER REVERSE RANGE WITH PIN AND ADD 440.47 USD 440.47 USD
R33714
Gasket - GASKET,TRANS CASE COVER ADD 16.91 USD 16.91 USD
R98918
Gasket - GASKET, CLUTCH HOUSING View/Update 15.79 USD 15.79

I had at one time the factory drawings for the shifter for the 2510 complete with dimensions. Sorry I have no idea where it is now. I had repaired the top shaft in this tractor replacing all the well worn parts but could not make it shift properly. It was apart and together so many times that I could split it in 20 minutes. I had a couple of older mechanics look at and check my work, no improvement. After obtaining the drawings and measuring I found that the new shifter had been machined incorrectly.
As much as I like the 2510 I can't look at one today without thinking of that work order (#6724).
The good news is that I have done a lot of top shafts since with no issues.