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Sorry youre right. it drops 200 rpm. your calcs are pretty good. I do have egt and running 15psi boost. I am off to see my auto guy and get him to do a high speed drive so we can nut out a plan....

my box drops nearly 700 rpm when it goes from the 4th gear into lockup. at 85 kph that means it drops from about 2600. rpm to 1900 and it then becomes a slug when towing 2400kg.

If I can prevent...

thanks.
maybe the simpler question is "what is the easiest way to keep it in 4th gear so it wont shift up at all?"
mine is a 91 ST with the "Power" button on the shifter. no O/D to speak of

I...

Forgot. I want to cruise at about 90 kph with the van only. The truck gearbox is just perfect when its not towing.
Cheers

First I wanto to say thanks to all who have posted about Nissan auto gearboxes. The info has been a real help.
I tow a van and my auto box drops in from 4th to lockup at about 85kph.
I want to...

As it says - mine has "slipped" and is jury rigged at the moment.
Prefer a new one if I can get it, but a known working used unit is ok.

Thanks
Rick

Thanks in advance. I have had good value from the forum and its done Frank a power of good.
He's a 1991 TD42 with turbo + auto trans (which gives us both grief every now and again.)

Hopefully I...