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7 3 diesel vs 6 0
Dave, a couple of more points.
A 1997 is a couple gnerations older than the last PSD's, my 1999 (see picture # 19) is the last gen. they made before going to the new 6.0 PSD's.
I don't know about Turbo's mileage estimates, mine is similarly equipped except for having a 6 speed instead of an auto.
If my truck dropped below 16 mpg (under any circumstances) I'd be checking it over closely, maybe the auto makes a bigger difference than I thought. General driving I get about 18mpg (US gallons of course) and about 21-22 mpg on the highway empty, if I keep my right foot under control.
The only real weak spot on those trucks was the auto. tranny. They are fully electrically controlled and will hand grenade from the least electrical fault. The most common cause I'm told is the trailer plug. The TX senses electricity in the brake light circuit and uses that as a trigger to unlock the torque converter. Any corrosion or bad wiring will put a trickle of electricity in the brake light circuit and cause the converter stay unlocked, or constantly lock & unlock. Either way the TX is a goner. We had one of these trucks back then, it had 6 TX's done under warranty. When the warranty expired I dealt the truck on the same thing with a 5 speed.
Best of luck.
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7 3 diesel vs 6 0
Dave, it's a 5 speed, not 6.
The 6 speed wasn't available until the 1999 model. That was also the first year there was a choise of rear-end gear sets in a dually. Up to that point you could only get 4.10's.
The 6 speed is just a 5 gear with a bull-low added in. The difference though is huge.
With 3.54 gears in the back, and a 6 speed TX, (which is what mine is) the bottom end is actually a smidge lower than 4.10's with 1st gear of a 5 speed. The real differnce though is at the top end. At 60 mph in 6th gear that PSD is only turning 1350 rpm.
I'm not sure at what speed it hits the governor, I've never been brave enough to try spinning those 6 big 10 ply Goodyear Wranglers at anything faster than 110 mph, but there was still lot's of rev's and pedal left.
Sounds like it would be a good truck all the same.
Best of luck.
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06-10-2005, 10:18 
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