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Fixed...

I have the faint tick noise at high R's when dropping gear with the exhaust brake. Still use it in all gears even with R's as high as 3K on the tach and drop the exhaust brake on it. The tick noise with disappear as the R's fall off below 2K.As for usage you can use the exhaust brake in all gears and all R's of the tach... Even the owner manual says that the best hold back power is near 3K R's...

I use it in 6th all the time!As for the noise, could it be the vacuum pump under load?

my EB makes no abnormal sounds and is a awesome tool to safely slow you down in snow whilat in 4wd! stops faster with more control than regular brakes!

makes no sense to me. obviously, the higher the engine rpm, the more braking HP is created.In my 4500 I'd use it in just about every gear..Now, do keep in mind that high hp engine-braking in lower gear is "reverse-loading" the gear sets, but still, never had an issue with the 4500. I don't have an EB on my 5600 (yet) but plan to do so, as soon as funds are available.