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Re: 4L80E & TH400 Tech.
Excellent thread. Helped me tune up my TH400 really nicely.
Now, how about a stock 2003 Yukon 2500XL with 8.1 and 4L85E. It has 116,000 miles, the trans "works" perfectly and there are no trouble codes... but it shifts so soft I can't stand it. It's a daily driver, so what would I do to just firm up the shifts? I'm about to go in for a filter change... can I just enlarge the feed holes a bit? I'm concerned the 3rd and 4th accumulator mod might be too harsh?
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