Inconsistent shifting: any ideas?

d55dave said

So it isnt the shift point that changes, just the shift quality. I dont believe that this is related to governor weights or kickdown linkage.

I would suspect that it could be related to fluid temp. Did it shift best early in the day when the fluid was cooler? Do you have a good cooler installed?

Do you have a deep pan? If so is the filter extension installed?

Type F fluid causes firmer shifts if you wanted to try changing it.

Click to expand...

Yes, but... The shift quality on most runs was my problem. However, on one run when I shifted Low to 2 at 5500, it actually allowed the engine to continue to rev to nearly 6000 before settling in on 2.

The first run of the day was not the most crisp, it was just okay. The second run was the best, shift-wise, after 45 minutes of sitting. The third was after nearly an hour of sitting and the temperature was dropping fast, it was much sloppier!

I recently installed a new radiator (which is actually keeping the engine a little too cool!) and also a transmission cooler. I kept the electric fan on while warming up the car through staging through the run to try to keep the transmission cool.

Stock 904 pan. Can certainly try the Type F fluid.