Transmission Shifting Question.

[stationjj]

I bought my M1009 about 2 years ago. It always got a good solid firm shifting. Hard but not a real hard shift.

Last week I developed a hard very late shifting issue. My vacuum pump seemed good. Pressure around 22. SO I replaced the Modulator, and it helped some.
After some research on SS it was determined that the Vacuum regulator valve was bad, and found one a Amazon. While I waited for shipment I by-passed the regulator valve as suggested on SS. This worked great. It did shift real early and had to manually shift into 2nd for more power.

I got the regulator valve installed, and the transmission seems much better and smoother. I don't have that that solid firm shifting anymore. Normally I wouldn't complain or question how firm the shifting is. Since I have owned my CUCV I was told from research and people I have spoke with you want a good solid firm hard shift of the transmission. I am not a transmission or auto mechanic. Just a guy trying to learn and understand his CUCV.

My question should I be worried or concerned about the smooth shifting of the transmission now? When I say smooth. I can feel it shifting its just not the solid firm shifting I had before. What I have learned tells me this may not be right? I am confused.

I appreciate any input. Thank You!

stationjj

 

[the skull]

Did you check the rubber parts of the vacuum lines?
Just asking, check your fluid level and color, did you change
the fluid/filter lately?

 

[Skinny]

All that good stuff!!! Be sure to check vacuum at the modulator. I don't think the Cuck ever shifts very firm in factory configurations. You could tweak it with an adjustable modulator or a shift kit but I think the way your truck was acting was due to a partial vacuum leak. It now sounds like it operates as usual.

 

[M1009 NEWBEE 2013]

my 86' 009 does not shift hard at all. all shifts are smooth and precise no hard jerking or shard shifting. the only hard shifts I ever have is when I am into the throttle and that is normal.

 

[stationjj]

Thank You everyone for your input. I think I was confused and slightly paranoid.
The vacuum lines and fluid are good. I haven't replaced the fluid or filter. Again I have been told no need to do it, and also read about problem coming up after doing fluid and filter change.

Thank You,

stationjj

 

[cpf240]

I *would* change the fluid and filter... shouldn't cause any issues... What can cause issues is when one of those shops does the fluid flush. Those usually put in a lot of cleaning agents and seal conditioners, and all that can cause great heartache.

 

[MarcusOReallyus]

I *would* change the fluid and filter... shouldn't cause any issues... What can cause issues is when one of those shops does the fluid flush. Those usually put in a lot of cleaning agents and seal conditioners, and all that can cause great heartache.

Yup. The chemicals and it's often a high pressure flush, which can dislodge particles. Not good.

On the other hand, replacing your fluid, ALL of your fluid, isn't going to hurt, and it might help.

A few months ago I brought a "toasted" transmission back from the grave by replacing the fluid. The old stuff was black as used engine oil, smelled burned, and after a long drive the trans started slipping big time. I had to limp it to my destination. No other choice at the time, and yes, I knew that may have been finishing off my trans.

I replaced ALL the fluid by disconnecting the cooler line coming from the trans, and running it into a bucket. I added a short piece of rubber hose on the end just to keep things neat. Then I had one of my boys start the engine while I poured clean fluid down the filler tube. Kept doing that until I had fresh, clean fluid coming out.

I have more than 5,000 mile on that trans since then, including towing a heavy load on a couple of occasions, and no problems since.

Replace your fluid!

 

[stationjj]

Thanks for the advice. I will be replacing my fluid and filter. Now that I know to avoid the flush. Thank You!
I am unable to do proper fluid and filter replacement at my current location. I will have to have someone else do it for me.
Basically drop the pan and replace fluid and filter?

Again thanks everyone for your input. I learned something.

stationjj

 

[Gripy]

Yes dropping the pan and replacing the filter would be a good start. Just remember that you only dump so much fluid only via the pan, lots of it is still in the torque converter. A drain plug in your trans pan may be something to look into.

The TM does recommend tranny fluid changed every 30K miles.

 

[MarcusOReallyus]

Basically drop the pan and replace fluid and filter?

That only gets about a quarter of the fluid. To replace it all, re-read my post.

OR, you can drop the pan and replace the filter, then in a few hundred miles drop it again and replace the fluid, and repeat that cycle until it's looking clean and fresh. You'll probably need to do that 5 or 6 times with that method.