I regularly haul my A and 520 on that gooseneck at 10,000 lbs for both tractors + trailer weight. It pulls them pretty good, but you know they are back there. I lose about 5-10 mph on the interstate hills with the turbo putting out about 20 lbs of boost 75% of the time. And on big long hills the boost goes on up and shortly the turbo fan kicks in. I think my problem is the gearing for the 35x12.50x20 tires. I am not sure what it has, but it is either too much or not enough depending on which roads you are on. It wants to run about 2500 rpm in drive at 55 mph in tow haul mode, but not shift into OD until about 63 mph. Makes it a diesel drinker on the 55 mph 2 lane roads. Once I get to about 70 mph on the interstate, it walks on pretty good but takes a little time to get there. Also seems like it has more power once it gets over 60 mph, but getting there is a little slow when pulling a load compared to what I think it should. Most of the time my foot is 3/4 full throttle and on hills I have it on the floor. I have found letting off the pedal and slowly getting back into it seems to help and lets the turbo do more of the work. I think it has the wrong gearing. What is an easy way to see what gearing it has? I don't have the original window sticker that shows it.
I do have a SCT programmer, but don't have it programmed in any mode. It is set to the factory setting. I am afraid to turn up the juice since it is the troubled 6.0 liter. Can't afford to replace the head gaskets. It still has the stock head bolts and egr/oil coolers.
The brakes seem to be fine. The hay load just pushes a little bit. Stopping with the tractors on it is just fine. I have my prodigy p3 set on 6.7v and boost 3 when pulling either.
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