Transmission Jerky

[V8 Muscle]

On my 1999 GMC Dually 4x4 7.4, im having issues with my transmission. It doesnt happen all the time, some days its perfectly smooth through gear changes then other days its really jerky and bangs into gear. I have also noticed on some days that it sticks in 2nd when in drive and wont change up, even if I move the gear shifter down to 3rd and 2nd it doesnt alter anything. The transmission oil is on its right level and there is no leaks. This is driving me crazy as I cant ask no one out here in the UK as they dont have a clue about American trucks. If anyone has any ideas of what I can look at or if they know what the problem is then can they advise me of somewhere to get the parts from. Thanks.

[unusualmind]

On my 1999 GMC Dually 4x4 7.4, im having issues with my transmission. It doesnt happen all the time, some days its perfectly smooth through gear changes then other days its really jerky and bangs into gear. I have also noticed on some days that it sticks in 2nd when in drive and wont change up, even if I move the gear shifter down to 3rd and 2nd it doesnt alter anything. The transmission oil is on its right level and there is no leaks. This is driving me crazy as I cant ask no one out here in the UK as they dont have a clue about American trucks. If anyone has any ideas of what I can look at or if they know what the problem is then can they advise me of somewhere to get the parts from. Thanks.

 

maybe a long shot, but first thing I would do is a fluid and filter change in the transmission...how many miles?

[V8 Muscle]

maybe a long shot, but first thing I would do is a fluid and filter change in the transmission...how many miles?

 

 

Its only done 110,000 miles and the fluid has been replaced already. The thing is if the filter was blocked then it would be a constant problem but its not. I have been told that maybe the shift solenoid or a stuck valve but where do i find these on my transmission?

[Draenor]

How does the fluid look and smell? Are you getting any engine codes?

 

 

 

The soleniods are in the valve body. You would have to drop the pan and dissamble the valve body from the housing.

[V8 Muscle]

Cheers for that info, does anyone know any where I can source a new shift solenoid that can ship worldwide.

[V8 Muscle]

Or can anyone give me a reputable GMC dealers telephone number or a transmission delaers number so I can call them up. Cheers for the help.