The van was a good one. The 4l60e was its down fall though. I built it heavy duty and it held up fine, just had bad gear ratios for towing. Since you are not supposed to use 4th towing and 2nd was way down there it was third and that's about it for towing. I have a 2001 Suburban 8.1L 4l85e now. I don't miss the van much. It was more practical space wise though. Having all that room back there to throw stuff in sort of spoiled me. The Suburban is a lot less work and money so far and does almost everything much better. Read most of Billy Graves posts on Transmissions. It helped me a lot. I like the newer software and Hp tuners a lot better than burning chips with TunerPro also.
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