There are two different terms being used, "clean neutral" & "safety neutral". The Clean Neutral position after 3rd exhausts all bands and clutches. This position has the potential to cause an explosion. There are many companies that offer this option. If you use Aluminum drums you will not have a problem usually. The Safety Neutral position after 3rd exhausts all bands and clutches EXCEPT for the direct clutch (Large clutch drum directly behind the pump used for Reverse and 3rd). Keeping the 3rd gear clutch applied locks to the forward clutch hub and sun shell (exhausts forward clutch allows engine to idle) maintains all the internals spinning safely at engine rpm preventing over speed condition. You must keep the engine running for this to work. The only transbrake I know of that had this option was the Griner 12/22G25 model. This model is more difficult to manufacture and increases cost. Mainly used on high rpm engines with aluminum rods.
