I had a 1999 Chevy Suburban 2 wheel drive with the 4L60 and a 5.7 (350) and 3.73 gears. I was pulling trailers that weigh up to 7000 pounds several times a month. I change the trans oil once a year. I did not flush the system out.
First trans held up for 104000 miles.
Replacement trans didn't back Suburban out of bay where the trans was replace (company that replace trans said they ran it on their machine).
Next trans you could watch the tach jump 300 to 500 rpm when the 1-2 and 2-3 shift happen.
Next trans you could watch the tach jump 300 to 500 rpm when the 2-3 shift happen. when pulling a 4000 plus trailer. You had to watch how you pass someone......hit rev limiter when passing.
Next trans did the same thing as last trans did. Shop that put trans in knew someone that had this style trans in their race car. Suggested to bump trans pressure up 20 pounds. Fix the rprm jump problem....now have hard shifts.
Every trans was suppose to be tested at the shop that rebuild it.
I did contact the company that rebuilt the trans. He said I was pulling too big of a trailer. Suburban was rated to pull a 7000 pound trailer.
I had a 3 year 36000 mile warrenty on the trans. Sounds good-warrenty started and ended 3 years after the first trans was installed. I finally traded the Suburban with a 175000 miles on it. The trans was acting up again and I got a good deal on a new Chevy 2500 HD pick up.
The 4L60 is a good trans if you take care of it. I went to the wrong shop to get a rebuilt trans.
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