I asked a question about the E40D a while back about a hard 1-2 shift. Mark helped me, however I never got back to him (sorry Mark), as I needed to replace the shift lever to get my OD light operational again. I fixed it and the issue seemed to stop for a while, so I just forgot about it.

It's back again, last time it did it, it was hard enough to make the whole truck almost buck. It was a real good bang. So, could this be the 1-2 accumulator piston or the bore it resides in?

The next question I had is how long should an E40D take to shift from second to third? I've noticed on a steep onramp with some throttle, mine can have around 2.5-3 seconds of rev before it finally shifts (unloaded). I could of sworn I watched the tach climb a hundred revs or so during this once (real steep onramp), however maybe I was just dreaming, as I've never replicated it. Just wanted some opinion on this, wondering if I need to start putting some funds aside.

The truck has about 139K and the transmission looks to be original. It was used to haul a camper and a boat most of it's life, or at least that's what I was told.

Dan

 

It could be the 1-2 accumulator sticking. If there is an error code and the OD light is flashing the PCM will set pressure high and the shifts will slam.

A 2.5-3 second shift will usually destroy the clutch that is making that shift. It should also turn the fluid brown or black, especially if it happens more than once.

 

Thank you for your help, once again. There is no OD light flashing, however it does work now.

Is there anything to do about the slow shift? The fluid is still pinkish-red and looks fresh, so I guess it isn't gone yet.

Dan

 

You might want to check line pressures. There is a port on the driver's side of the trans, just above the pan, towards the front of the trans. It has a black hex head plug from the factory. Remove the plug and install a 0-350 PSI gauge.