Agnem said:
EZ, I think there are a couple out there.
This one comes to mind. I don't know much about them though, although I think Darrin just put one in, so I'd listen to him.
Just was reading through the FAQ on this site Mel...
Here is what they say about using it in overdrive
"Does the exhaust brake work when I’m in overdrive in an automatic transmission?
No one’s exhaust brake will perform when the automatic transmission is in overdrive. This is because of a feature that all four speed automatic transmission with overdrive manufacturers have in fourth gear. It’s called "coast clutch" and it disengages the engine from the rear wheels any time your foot is not on the throttle.
Since an exhaust brake can only be engaged when your foot is not on the throttle, any pressure being developed cannot be transferred to the rear wheels when coast clutch (overdrive) is engaged. Therefore, anytime you want engine braking, the overdrive must be disengaged."
hmm...., is it me or are they a bit mixed up?