If you set the transmission to pre-select 4th instead of 5th when the jake is engaged, you need to be careful that you don't overrev the engine. Max rpm under full load is 2100 rpm; max rpm under no load is 2225 rpm. Jake brake isn't quite full load but at 350 braking hp, it's not no load either. Having the transmission pre-select 4th can easily push the rpm's beyond 2225.
David Brady
'02 Blue Bird, Wanderlodge LXi
Series 60 equipped.
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