My 4wd automatic transmission will jump about 150rpms (or less) in OD, usually around 2700 rpms. I took it to a specialist who's diagnosis was 'low power'. He explained that the 3 and OD gears both have a 'fuel saving gear', 1 to 1 to the engine. OD and 3rd really have 2 gear options. Because the Van is 4 cylinders, it doesn't have enough power for the transmission to function properly, but, it works and isn't being damaged (he said). He seemed to be familiar with the transmission and claimed it was used by multiple car companies including Volvo. He said it was a good transmission, functioning as well as possible under the circumstances.

When the rpms are pulsing, I can slow down or speed up and it stops. The rpms tend to drop first, not rise.

I'm posting this here because I believe the 2wd transmissions are similar?

If this is 'normal', there would be a thread about it. I couldn't find one. Has anyone experienced this?

Is my van a 6 speed? HUH?