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the manual says not to tow in overdrive but my trucks engine is telling me not a problem. On a flat grade 5th gear almost seems to low.
would'nt it be easier on the truck to put it in OD when not stressing the engine?
Until I get used to this new truck please bare with me and my questions.
thanks for any replies,
JK
Yep - you got it right. Tow using overdrive unless the transmission starts hunting around - then lock it out. The way the manual says it is pretty dumb - yea, like you could tow a trailer on a 4-lane highway without OD?? I think not. It doesn't take long to get used to kicking it out every now and then.
I'm guessing you have a 6 speed manual? since 5th is too low of gear. Cat_man is referring to an automatic, but he's right either way. You should be able to tow in overdrive/6th no problem. Just watch the rpms and be sure not to lug it too hard, but you can usually tell then just by the way the truck feels pulling. The PSD has plenty of power and you could pull some small grades in OD without a problem. Go luck!
I tow in OD all the time unless the engine starts to bog down. I have a 5-speed. Even with an auto it is fine to tow in OD unless the transmission starts seeking.
I am a new guy to Diesels but an old guy to towing RV's (30yrs). I've pulled 12,000 lb fifth wheels, 10,000 lb trailers and this question always comes up, should I pull in OD?
My 12000 lb fifth wheel was pulled with an F250 HD 460 with a 4.10 Axle and it simply did not do well in OD anywhere. But in (always had autos) in third gear at 1 to 1 ratio there wasn't any problems.
My 10,000 trailer I pulled for three years with a V10 F250 SD 4.30 axle and sometimes when I wasn't bucking the wind or going up hill it did ok in OD, but I would say 75% of the time was in third.
I have the same trailer now being pulled with a 7.3L PSD and the change is noticeable that if I maintain a good 60 to 65 mph I can pull in OD about 75% of the time instead of third. The moral of this story is weight of the trailer, power of the engine and keeping speed in a reasonable zone, you can use OD but not all of the time. If she start shifting a lot get it into third gear or whatever ratio is 1 to 1.
When my relatives 4R100 went out while vacationing, the tranny shop disassembled his trans, took one look at the guts and said "Don't tow in overdrive."
When my relatives 4R100 went out while vacationing, the tranny shop disassembled his trans, took one look at the guts and said "Don't tow in overdrive."
My parents tow a 12K# fifth wheel with their PSD auto and use OD unless it starts seeking. No problems yet and they are approaching 100K miles.
I've been towing 9000+lbs with my PSD since I've had it using OD with two exceptions, if the transmission hunts or if I'm pulling in city traffic then OD gets turned off. I'm on my original tranmission with nearly 192,000 miles and no problems yet.
I'll run in OD most of the time when I'm pulling my 24' Coachmen TT. When pulling my 30' Fleetwood OD works well on the flat. But when the road starts to climb I'll drop down to 3rd ( OD off ) and I can see that the engine isn't working as hard as the vacume increases several inches.
My 4R100 runs cooler in OD than in 3rd. It takes alot for the tranny to start to hunt, so if I see a grade or other conditions that warrant I shift into 3rd. I was amazed to see the cooler temps. I tow a 36ft. 5th wheel. Total GVW right at 20,000 lbs.
Judy K,
I tow 10,000 plus with my 99 PSD auto and I take it out of Overdrive only if it starts to lug in high gear. I have a SCMT set at 90 extra hp and I watch my gauges closely when it starts to pull. I have 125,000 miles so far and am not detecting any problems with my tranny. I know my tranny is the weak point in this truck but it's also not made of plastic sooooo... Good Luck!!! Paul
When my relatives 4R100 went out while vacationing, the tranny shop disassembled his trans, took one look at the guts and said "Don't tow in overdrive."
This is the first I have ever heard about an E4OD based tranny being damaged by overdrive. The reason that rule came around is the smaller cars OD gears are physically smaller and weaker than the others. This is not so with the E4OD/4R100. Also smaller motors that are not up to the task may hunt gears more. The diesel does not do this if driven carefully.
My guess is the tranny shop may have had a canned response.
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