JHZR2
Staff member
cant really expect something to go without service for 150k (if its specced for PR before then), and then get worked on and have flying credentials. Youve got to expect some pretty bad conditions, and thus $$$ expenditure to get it right. Just the way it goes in the automotive world.
that said, its a pretty good trans, and at some time around 95, they started putting in '100k mile fluid' in some GM trucks. So he MAY have some saving grace from that...
I like castrol dexron III, available at autozone.
I have a car that has always had its service, and some places will refuse to change fluid because of the mileage (200k+). But some places are stocked with idiots too. I have read situations where transmissions were severely undermaintained (this one may be undermaintained from 50k-120k, depending on specified fluid service life), and had the fluid changed, got all sorts of problems, had it changed, with filter a few more times, and then it was OK.
I would advise against any sort of flush, or even any special additives. Make the services very gradual... first change fluid and filter, with just dexron. Repeat after a few hundred miles. repeat again after a thousand, then drain just the fluid in the pan after another thousand. drive 1000 more, then replace fluid and filter, add the LC, lubrigard, etc.
This of course assumes not real issues. If problems arise, then I would waste no time to find a good shop and get it repaired. poor maintenance has its costs.
JMH
that said, its a pretty good trans, and at some time around 95, they started putting in '100k mile fluid' in some GM trucks. So he MAY have some saving grace from that...
I like castrol dexron III, available at autozone.
I have a car that has always had its service, and some places will refuse to change fluid because of the mileage (200k+). But some places are stocked with idiots too. I have read situations where transmissions were severely undermaintained (this one may be undermaintained from 50k-120k, depending on specified fluid service life), and had the fluid changed, got all sorts of problems, had it changed, with filter a few more times, and then it was OK.
I would advise against any sort of flush, or even any special additives. Make the services very gradual... first change fluid and filter, with just dexron. Repeat after a few hundred miles. repeat again after a thousand, then drain just the fluid in the pan after another thousand. drive 1000 more, then replace fluid and filter, add the LC, lubrigard, etc.
This of course assumes not real issues. If problems arise, then I would waste no time to find a good shop and get it repaired. poor maintenance has its costs.
JMH