The automatic transmission began shifting at unusually high RPMs, so I got the throttle rod adjusted for a temporary fix. However, I think that the transmission is probably on the way out very soon, so I'm trying to get rid of this truck. Other than that, though, there have been no major problems with it.
This is not a fast vehicle by any means, even though it has a V-8.
It sucks down gasoline like it's free, which is not good for teenagers with no money.
Bad points aside, it would make a good work truck, since you can fit a large quantity of stuff in the back.
Your trans shifts at "unusually high RPM" because your transmission cooler is clogged. All the adjustments in the world won't fix it. I hope you figured that one out by now.
How do you know the transmission cooler is clogged? To me, that would not necessarily suggest that the transmission would shift at a high RPM. I am not familiar with this particular transmission (I have a D-150 with a 4 speed manual), but just in general, I would not not rule out a vacuum modulator valve (if the '87 was still vacuum controlled), a mis adjusted band or actuator assembly, or a plugged up valve body. I do not think you can make that diagnosis, of that symptom, right off the top of your head, and you certainly do not need to chew the guy's head off.
I put a shift kit in my truck. It never had any major problems with it. I removed all the EGR and emissions. I picked up 3mpg and a lot more horsepower.
Truck runs very well, 0-60 in about 6 seconds. I do race mine. Of course it has the 360 in it.
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