Lacking Power
I purchased a 1998 Gulf Stream Sun Voyager today. It has a 5.9 liter Cummins Diesel with Allison 4 speed transmission. The test drive the owner took me on was about 20 miles, since I didn't drive I...
Forum Discussion
The 5.9 is good on fuel and reliable and you can definitely get more power out of it but I think your weak link is going to be the 4 speed Allison. Having a Cummins center take a look is a good idea and you might also check into a Banks kit although I don't think Banks will install a kit using anything less than a 6 speed tranny.
I have the 24 Valve 5.9 mated to a 6 speed Allison and while I can't compete with the big boys as long as I watch my weight I'm not far behind.
I have the 24 Valve 5.9 mated to a 6 speed Allison and while I can't compete with the big boys as long as I watch my weight I'm not far behind.
