Ford 6.7L Power Stroke Diesel :: Optimum Gear Ratio For DRW - 3.73 Or 3.55?
Sep 25, 2014
I got burned with a smoker back in the mid 1980's and have been hesitant to come back. I am currently pulling my 5er and my enclosed gooseneck with a 6.2 gasser SRW. It has the 3.73 gears in it...not the best for towing.
I am thinking about ordering a new SD DRW 2wd with the 6.7 PSD.
Both my trailers are rated at 18000 GVW, what would be the best ratio to order? 3.73's?? 3.55? Fuel mileage will be what it will be with what ever ratio I go with. The truck will be mainly a puller. Not a daily driver.
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Have a 2003 F350 srw 4x4, 107,000 miles on it. Driving it last night tow/haul light started flashing, hooked up AE got a P0730 Incorrect gear ratio. Truck seem to do ok, cut it off went back out a little while later and the tow/haul didn't flash.... Only issues I've had is when shifting from P to R, it takes a second or two longer than it should and shifts hard when it does but it doesn't do it every time.
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I have 2007 6.0, rough idle starts, rough and no power till engine reaches running temperature, runs great after that. If the engine is off for half hour, and restarted, runs rough again till engine temp is back again.
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The oil and water readings on my SG have been gradually climbing for the last few year to where they are about 15* above the ambient temperature after sitting over night. My question is could the values for the other readings be getting high. For instance going down the road at 65mph my ICP was 1250 and my IPR was 62.
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Was doing some errands this morning and on the way home the transmission shifted a little strangely into 2nd. I had to let off the throttle for it to shift.
Fluid levels are correct and not burnt with no residue floating with a pinkish red color. Using Schaeffer's All-Trans Supreme.
I have read all of the threads related to the P0732 and the mechanical diode issue. Does the e99 4R100 have the mechanical diode? If not, what else could it be?
I also have the P0500 VSS sensor circuit fault which an old Ford mechanic stated could be related to a bad fuel sending unit which is definitely bad on this truck.
Am planning to go out and clean the sensor on the differential. Speedometer is working properly. I have also noticed what appeared to be a small slip when in reverse a couple of times that I initially attributed to tire spin. Is any of this related? Should I be prepared to rebuild/replace the transmission?
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What are the most favorable low-side/high-side pressure readings for the AC when fully charged?
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Well, last night I took my F-350 up a wheeling trail. I'd been up quite a few times in my old Rover, so I knew I could go a ways in without damage. Just uphill, muddy, and ruts / rock steps.
One thing I notice is that when you engage low range in the diesel, the transmission starts in 2nd gear. My previous gas Super Duties always started in 1st. I'm assuming this is to protect the transfer case from torque overload. Also, the throttle response seems to change when low is engaged (the pedal becomes less responsive, which is nice).
I've had the gas Super Duties off road before, and all of mine have had the locking rear diff. The diesel lugged along perfectly. My biggest fear was crunching the DPF / SCR / DOC canister on a rock step. In that respect, I'd rather wheel a gas. The manual shift function makes a lot of sense in low range - you can force a start in 1st, 2nd, or 3rd. And prevent meaningless up / down shifts since the grade can change quickly.
These trucks' biggest hindrance is their size. However, if you have the trail room, they are actually excellent off road. Many people look at a Super Duty and see a vehicle good only for pulling or hauling. Not so, these trucks are as good as a Jeep off road, again with trail room being the only concern. The locking rear diff was never really needed, but I engaged and disengaged a few times to keep the mechanism free. I really love this feature.
One thing that happens frequently for me in north-east wheeling is water crossings. Could be a simple brook but mostly it is mud holes encountered on tight trails. In some cases these are only a foot or so deep; in other cases they are 4 feet deep. Ford states to "try" to keep the water below the level of the hubs, which amounts to about 15". Aside from possible front axle contamination, my biggest concern would be the electronics on the diesel which are mounted to the frame or floor pan (transmission module, NOx module, etc.) The gas Super Duties don't have these concerns. In the old days, as long as a diesel had air, the engine would run under water. This engine requires electronic control of many things, including the injectors...so it won't. There are also some axle / transmission breathers which run about floor pan high to be concerned about, but these can be easily extended.
Maybe it's due to the twisty frame which GM loves to insult Ford about, but these trucks have excellent wheel articulation. I'd be surprised if a coil sprung power wagon flexed more, at least in the rear. I'm impressed.
Finally, the traction control. I experimented a bit on a slippery rock step. This was the only step which required the rear locker - sort of. The front wheels climbed the step, but the back flexed to the point of one rear wheel basically almost off the ground and severely unloaded. With 4x4 Low engaged, and traction control "off" as much as Ford will allow, the truck could not pull itself up. Turning traction control on allowed the truck to very nearly pull itself up. A little more throttle / finesse probably would have gotten the truck over, but lots of ETC operation glazes the brakes and spews brake dust everywhere. Being able to start in a higher gear manually really adjusts the torque control. Locking the rear end and the loaded wheel bit right in and she went up and over.
When doing some off-road driving, the "off-road" screen for those of you with the LCD message center is kind of fun and informative to watch. It's nice to see how far your wheels are turned left or right when spinning in ruts or what crazy angle your truck is on. Howie Long could probably document the exact up / down / left / right slope angle a Super Duty needs to be on in order for the tailgate not to open. I never had an reason to open the tailgate while in these crazy angles, of course.
Overall, very impressed. It's not as good as my old Range Rover, but I would say more talented off road than ALL other Ford vehicles except the Raptor.
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When the truck shifts into 5th gear i instantly feel a constant vibration and noise until it shifts to 6th gear. This happens nearly every time while driving at 40mph. Rpm range 1200 - 2000. I bought the truck new on June 30th and noticed the problem on my way to work on Monday July 2nd. Took it to the dealer on July 5th and the tech said it was the torque converter slipping. I drove it home because they didn't have time to work on it. Took it back on July 12th and the dealer has had it since (currently 30 days) They originally told me it was not the engine or transmission and it was an exhaust problem. Last week they said it was the motor mounts and said they would be done.
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What's too big? I just put 33s on my super duty, is it "too much" for the transmission?
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Having some problems with an e-350 dying when in gear and rough idle. Truck starts up after it dies. Vehicle acts like it is starving for fuel. I have check fuel pressure after fuel pump and getting 55psi. High oil pressure pump with in normal ranges. Cleaned and checked egr and it was in the closed position. Fuel filters have been changed. Injector buzz test ok.
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2011 6.7 with 3.55 gearing. Just got the truck. And it seems when its cold the truck will rev high in 3rd gear and then sort of fall into 4th gear sort of losing power for a split second. If I gas it hard, its not as bad. Usually only happens like I said when its cold. Check the trans fluid its full and looks clean. My guess is some sort of sensor or the computer???
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Sitting at a light. I noticed a slight vibration while in gear. Get home. Put her in park and noticed it again. Took her for a spin again. It seems to do it at low speeds, cruising and goes away once I'm on it? What would be a good starting point to track this down?
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I know that when you are in the manual mode you can see which gear you are in on the right hand side of the small display between the speedo and tach (forget what that display is called). Is there a way to configure that screen so you can see which gear you are in while in "Drive"? With six gears to go through and these things shifting so smooth, I just think it would be nice to be able to tell what gear you are in at any particular time (especially when towing). -Glenn
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What's the best way to access the adjustment nut I can see it through the wheel well but it looks like I would have to take that off the get to it
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2007 F350 138,000 miles
I'm having a small problem. For the past couple of weeks I've started the truck in the morning. I let it run for a few min's as I always do. I jump in it an put into gear and it stalls. Put back in Park , starts right up and then is fine.
knowing that the EGR is due for its monthly cleaning, I went ahead this time around and got a new one for it. Same thing this morning.
I think its kinda odd that it stalls that one time and then is fine. I do run a scan gauge in the truck as well.
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My 2012 f250 is been acting weird, usually the truck is boosting while on gear when I'm at a stop (around 0.40) I think that's normal on a 6.7 because it's always done it, but since yesterday I noticed it sounds different and it's not on boost anymore it just vacuums while on gear at a stop (around -0.25) I'm thinking it's the wastegate solenoid but I'm not 100% sure, and the truck doesn't boost as fast as before but it drives fine and I'm actually getting better gas mileage since it doesn't boost as before, what it could be? It's tuned and deleted....
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I have a 2005 f350 king ranch,I have a kinda weird problem.the truck starts up and runs great as long as I let it get to normal temp.but if the motor is cold it will idle fine but if I goto put it in gear it just dies.sounds like tc is locking but I don't get any codes.
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2004 excursion 6.0, head studs, 4inch straight pipe, egr delete, sct live wire ts running vivians looney wild, so I recently rebuilt the trans (5r110w) just soft parts rebuild frictions and steels, and it has about 5000 miles on it since, but I have ran into the issue of the engine stalling when it's cold when I put it in gear, any gear that is, but once it's warm it's fine, just checked the fluid and it was in the sweet spot, also on my tuner the command gear is going from 2nd, 4th, and 6th completely skipping 1st, 3rd, 5th, trans was shifting normal until about 100 miles ago and my tuner is telling me my icp is 600ish at warm idle and at wot only seeing 1500 psi maybe, any clue as to what this would be? Truck won't start with stock tune, guessing the looney wild is ramping up the icp and is seeing at least 500psi to start. I'm thinking it's possibly the hpop.
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2005 F250 4X4 6.0 .. Why my truck just stopped going when put in gear and the TOW/HAUL light just kept coming on, without pushing it 2 days prior? Now it will not go anywhere, starts great, gas pedal works because RPM's go up when pushing! Just will not go when put in drive or reverse! What else I can do? I replaced cylinoid B in the transmission, speed sensor, and brake switch.
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After doing some hunting/wheeling with my son, got back to town and 2003 Excursion w/ ~145K miles would not budge in any gear. No codes with Scangage. After 30 minutes I finally thought to rev it up and it shifted hard into gear, and drove normal home. What do do now?
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So I replaced ball joints and hub bearings on driver side of the truck today ( passenger side tomorrow). Problem is when I pulled the axle out gear oil started to leak from axle housing not a lot but a leak nonetheless. Is this normal or did I break something.
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