Thats wierd.....How did you instal them? are you sure you got all the shims out? You need to make sure you measure properly too. I set them @ .071 and made sure they were the same. I have the 4000gsk in my truck and the stupid 3000gsk hammers down in that 5speed compared to my auto....But he does have a 0 plate and the 215 pump so im sure thats why his goes better than mine.

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Its red line is 3000 With a stock pump. Once you upgrade your pump to push more fuel, then you can turn more rpms ans still be making power. Your truck will perform much better with the springs and even better if you advance your timming....so i hear, but i have not done it yet... thats next

 

If I remember correctly it has been noted to run at least a #10 plate to see great results. The gov spring kit doesn't work as well with a #11. Again if I remeber correctly.