Anyone on here rebuild an FM146?

[kodogtwh]

There are pretty obvious big snychros, and little synchros. They are easy to replace. I'm mainly having issues determining which spot the one 'thick" synchronizer ring goes. I didn't pay attention while disassembling, that's my own fault. I ended up using all the small synchronizers and reusing an old one for 5th & rev because the 'thick' one made the gear stack too long to install the retention ball & sleeve on the end of the main shaft. After all was said and done i realized: "That's stupid, i'm stupid, there's somewhere that the 'thick' ring goes, and i need to disassemble this thing again and find it."

So i've come here for answers. It's not specified in the rebuild kit or the service manual.

Addendum: I broke a chunk off the transmission case with my little 1/4in impact, thus rendering the entire transmission as scrap. Now i'm in need of a good condition used FM 146.

 

[Uncle Gump]

@gearfather

 

[Shran]

I'm guessing it's the reverse synchro or 1st? Is it missing teeth in several spots around the edge (reverse?) The 1st gear one pictured below looks thicker, not missing teeth. I don't remember, I should, I built a couple of these recently.

My book shows MIT-14H for reverse

Midwest Truck & Auto Parts MIT-14H - FM146 REVERSE SYNC RING | FinditParts

Midwest Truck & Auto Parts MIT-14H FM146 REVERSE SYNC RING ✓ Order now for same-day shipping on eligible purchases from FinditParts.com, America's online marketplace for heavy duty parts.

www.finditparts.com

MIT-14A for 5th

Midwest Truck & Auto Parts MIT-14A - FM145 FM146 3-4 5TH SYNC RIN | FinditParts

Midwest Truck & Auto Parts MIT-14A FM145 FM146 3-4 5TH SYNC RIN ✓ Order now for same-day shipping on eligible purchases from FinditParts.com, America's online marketplace for heavy duty parts.

www.finditparts.com

MIT-14B for 2nd

Midwest Truck & Auto Parts MIT-14B - FM145 FM146 2ND SYNC RING | FinditParts

Midwest Truck & Auto Parts MIT-14B FM145 FM146 2ND SYNC RING ✓ Order now for same-day shipping on eligible purchases from FinditParts.com, America's online marketplace for heavy duty parts.

www.finditparts.com

MIT-14C for 1st

Midwest Truck & Auto Parts MIT-14C - FM145 FM146 1ST SYNC RING | FinditParts

Midwest Truck & Auto Parts MIT-14C FM145 FM146 1ST SYNC RING ✓ Order now for same-day shipping on eligible purchases from FinditParts.com, America's online marketplace for heavy duty parts.

www.finditparts.com

MIT-14A for 3rd and 4th (above)

 

[kodogtwh]

I'm guessing it's the reverse synchro or 1st? Is it missing teeth in several spots around the edge (reverse?) The 1st gear one pictured below looks thicker, not missing teeth. I don't remember, I should, I built a couple of these recently.

My book shows MIT-14H for reverse

Midwest Truck & Auto Parts MIT-14H - FM146 REVERSE SYNC RING | FinditParts

Midwest Truck & Auto Parts MIT-14H FM146 REVERSE SYNC RING ✓ Order now for same-day shipping on eligible purchases from FinditParts.com, America's online marketplace for heavy duty parts.

www.finditparts.com

MIT-14A for 5th

Midwest Truck & Auto Parts MIT-14A - FM145 FM146 3-4 5TH SYNC RIN | FinditParts

Midwest Truck & Auto Parts MIT-14A FM145 FM146 3-4 5TH SYNC RIN ✓ Order now for same-day shipping on eligible purchases from FinditParts.com, America's online marketplace for heavy duty parts.

www.finditparts.com

MIT-14B for 2nd

Midwest Truck & Auto Parts MIT-14B - FM145 FM146 2ND SYNC RING | FinditParts

Midwest Truck & Auto Parts MIT-14B FM145 FM146 2ND SYNC RING ✓ Order now for same-day shipping on eligible purchases from FinditParts.com, America's online marketplace for heavy duty parts.

www.finditparts.com

MIT-14C for 1st

Midwest Truck & Auto Parts MIT-14C - FM145 FM146 1ST SYNC RING | FinditParts

Midwest Truck & Auto Parts MIT-14C FM145 FM146 1ST SYNC RING ✓ Order now for same-day shipping on eligible purchases from FinditParts.com, America's online marketplace for heavy duty parts.

www.finditparts.com

MIT-14A for 3rd and 4th (above)

You got any for sale? I ended up Totalling out mine by breaking off the boss for the 3-4 detent ball plug.

 

[Shran]

You got any for sale? I ended up Totalling out mine by breaking off the boss for the 3-4 detent ball plug.

Oh dang… you broke that off the main case? I don’t think I have that… maybe you could get tig welded back together?

 

[kodogtwh]

Oh dang… you broke that off the main case? I don’t think I have that… maybe you could get tig welded back together?

I'm not gonna put my welder friend through the trouble of gluing some dirty, cast aluminum back together, over a transmission that's not worth that much. And I mean whole transmissions. I'm sick of the crap m5od I put in. Shifter keeps popping out of the gates leaving it stuck in random gears at times. Shifter bushings don't help.

 

[North Idaho 5.oh]

Just a dumb question…. Why not use a better trans? Something like the M5OD?

 

[kodogtwh]

Just a dumb question…. Why not use a better trans? Something like the M5OD?

Ive had all 3 of the most common 4x4 transmissions. 145, 146, and currently have an m5od. The Mitsubishi transmissions are lighter, shift better (IMO) and are no weaker than the Mazda. Plus I have an '87, which has a different floor, causing me to have to chop it up to get the m5od to fit. Not to mention how it's pretty easy to break aluminum shift forks.