M923a2 Transmission

[Crf450x]

I just bought an m923a2 a couple weeks ago. Drove it 250 miles home and have put 100 miles on it since. The transmission has shifted flawlessly. Today I took off in it and it wouldn’t go into 5th gear. So I headed back home in 4th and then lost that one too. It downshifted to 3rd by itself and got me home. Still have reverse. Fluid is clean and full. Temp never got above 160ish. Also now it kinda tries to lunge backwards for a split second when I first start it. I can do that repeatedly and it does the same thing every time. Strange.
Any ideas? Do I need a trans? Haven’t pulled the pan off yet as it’s too muddy to get the pos in the barn.

 

[simp5782]

I just bought an m923a2 a couple weeks ago. Drove it 250 miles home and have put 100 miles on it since. The transmission has shifted flawlessly. Today I took off in it and it wouldn’t go into 5th gear. So I headed back home in 4th and then lost that one too. It downshifted to 3rd by itself and got me home. Still have reverse. Fluid is clean and full. Temp never got above 160ish. Also now it kinda tries to lunge backwards for a split second when I first start it. I can do that repeatedly and it does the same thing every time. Strange.
Any ideas? Do I need a trans? Haven’t pulled the pan off yet as it’s too muddy to get the pos in the barn.

You need to do a pressure test on the transmission thru the ports it has on it to see what pressures you have for each gear.

 

[Crf450x]

You need to do a pressure test on the transmission thru the ports it has on it to see what pressures you have for each gear.

Thank you. I will try to do that next week. I’ll have to bring a pressure gauge home from work. In the meantime I think I’ll pull that governor filter out and have a look. According to that guy, governor pressure is related to road speed so in my mind it would make sense to lose higher gears first right?

I am a diesel mechanic (mostly light duty) but never done much with automatic transmissions besides replace them.

 

[Crf450x]

Pulled the governor filter out. Perfectly clean. Pulled the governor out and didn’t see any obvious problems. But the fluid that came out was drastically different from what’s on the dipstick. Looks and smells expensive. It does have atf in it by the way.

 

[simp5782]

Was going to ask if the transmission would shift thru all gears properly if you put the transfer case in low range. This allows the transmission to pull thru gears with less pressure needed to operate. Sure way to tell of you have a pressure issue.

Where in TN are you?

 

[Crf450x]

Was going to ask if the transmission would shift thru all gears properly if you put the transfer case in low range. This allows the transmission to pull thru gears with less pressure needed to operate. Sure way to tell of you have a pressure issue.

Where in TN are you?

I should be able to try low range tomorrow. Would letting it shift through the gears with the transfer case in neutral first be of any help? I’m kinda afraid to get it back on the road.

I’m in fall branch. Almost as far east as you can go in TN.

 

[simp5782]

I should be able to try low range tomorrow. Would letting it shift through the gears with the transfer case in neutral first be of any help? I’m kinda afraid to get it back on the road.

I’m in fall branch. Almost as far east as you can go in TN.

You wont feel anything in neutral. You need some type of resistance. . low range the max speed is 22mph so you will know the shift, it will roll thru pretty quickly

 

[Crf450x]

You wont feel anything in neutral. You need some type of resistance. . low range the max speed is 22mph so you will know the shift, it will roll thru pretty quickly

I’ll try it tomorrow. What do you think about the backwards jerk when starting?

 

[simp5782]

More than likely the transmission is toast. They tend to do that unfortunately. Act fine and then just nothing.

Ive got one in Memphis that is a good take out if needed.

 

[Crf450x]

More than likely the transmission is toast. They tend to do that unfortunately. Act fine and then just nothing.

Ive got one in Memphis that is a good take out if needed.

That’s what I’m thinking at this point. Any idea on an average cost to rebuild one? I can pull it out myself but I’d have to pay to get it rebuilt.
And thanks for letting me know. Memphis is quite a drive unfortunately.