An automatic transmission with 300,000 miles on it should be in some kind of record book it's unheard of !!! It seems counterintuitive but changing the fluid on a tranny with this many miles can be the death knell. I have seen it many times but if you got that many miles out of it was on deaths door anyway. If you are really attached to it don't even think about a junk yard tranny, they will be just a little less worn out that the original in you car now. FYI it's going to be at least 2G's to have it rebuilt.
Testimonial: "Bummer! Well, thanks for your info! I felt it was time to sound the bugle and play Taps. I'll miss the old girl!"
SOURCE: 2001 4WD Automatic 6 Cyl transmission problems
The transmission in your vehicle is a 4L30E model,manufactured by General Motors,and used in vehicles from BMW's to Cadillacs,Isuzu's and Honda's.The transmission is BASED on the old Chevette Turbo Hydramatic 180 model.The 4L30E is basically a TH180 with an overdrive unit added on.I rebuild transmissions for a living,and have seen the 4L30E over and over with the same failures,inherent weaknesses,and every transmission model has them,just in different areas.The 4L30E failures are nothing new,so don't despair.Hopefully the trans currently in your truck will be problem free.
SOURCE: 2000 ISUZU TROOPER WITH AUTO TRANSMISSION. CHECK
If the fluid is up -
it could be a vacume loss or the shifting module..
The shifting module is what tells it to shift - and it is controled by vacume pressure..
SOURCE: 2001 Isuzu Rodeo Check Engine Light flashes when accelerating.
I would change the trans flter, trans fluid, and have the linkage on the trans adjusted.
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Rpms....not rims
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