heaviest you've towed with a 300.

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deere114
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heaviest you've towed with a 300.

Post #1 by deere114 » Wed Dec 13, 2017 11:05 am

Got in a slight argument on another page today about how a 300 will perform in a towing application. Thought it would be cool to start a collective thread on how much weight people would move and their set up. We set my brothers truck up like this: 85 f150 300 np435 9" with 3.50 gear set. Air bags on all 4 corners, brake controller, efi manifolds with walker y pipe and 2.5" exhaust. Unsure how to post pictures from my phone, but tows a loaded double axle trailer every day. Run e rated 235/85r16 tires when we approach the 7500lb give limit of the trailer, pulled a full size k5 blazer up the highway with zero issues. How's everybody else do?

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Re: heaviest you've towed with a 300.

Post #2 by Harte3 » Wed Dec 13, 2017 11:26 am

'83 F150 300, 0.030 over, Offy DP, Holley 4160/1848-1 465 cfm, Comp Cam 260H. P/P head, EFI exhaust manifolds, Walker Y Pipe, Super Cat, Turbo muffler, Recurved DSII, Mallory HyFire 6a, ACCEL Super Stock Coil, Taylor 8mm Wires, EFI plugs.

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Re: heaviest you've towed with a 300.

Post #3 by deere114 » Wed Dec 13, 2017 12:20 pm

I've used that thread as reference a bunch of times. Has me considering a comp 260h for my next engine.

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Re: heaviest you've towed with a 300.

Post #4 by Harte3 » Wed Dec 13, 2017 2:29 pm

With an heavy duty 5 speed and a 2 speed drive axle like some of the bigger trucks came with one can do some 'truckin'...not fast but certainly move some serious weight.
'83 F150 300, 0.030 over, Offy DP, Holley 4160/1848-1 465 cfm, Comp Cam 260H. P/P head, EFI exhaust manifolds, Walker Y Pipe, Super Cat, Turbo muffler, Recurved DSII, Mallory HyFire 6a, ACCEL Super Stock Coil, Taylor 8mm Wires, EFI plugs.

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Re: heaviest you've towed with a 300.

Post #5 by deere114 » Wed Dec 13, 2017 2:36 pm

Funny you should mention that. My brothers truck is getting a gear splitter this winter. Np435 is a good trans but a few in between gears would help in certain situations

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Re: heaviest you've towed with a 300.

Post #6 by Lazy JW » Wed Dec 13, 2017 3:59 pm

22,000 lbs CGVW with the rig in my profile picture. I prefer to not go over 20,000 lbs though. The real problem isn't getting it to go, it's getting it to STOP!
"The White OX" 1974 F-350 300-6, Stock single exhaust, Carter YF, T-18A, Dana70 w/4.11, Flatbed dually w/dump bed. "Where no oxen are, the crib is clean, but much increase is by the strength of the ox" (Proverbs 14:4)
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Re: heaviest you've towed with a 300.

Post #7 by Lazy JW » Wed Dec 13, 2017 4:01 pm

deere114 wrote:Funny you should mention that. My brothers truck is getting a gear splitter this winter. Np435 is a good trans but a few in between gears would help in certain situations


I would dearly love to have a Gear Vendors Overdrive in my White Ox 8) :nod: :thumbup:
"The White OX" 1974 F-350 300-6, Stock single exhaust, Carter YF, T-18A, Dana70 w/4.11, Flatbed dually w/dump bed. "Where no oxen are, the crib is clean, but much increase is by the strength of the ox" (Proverbs 14:4)
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Re: heaviest you've towed with a 300.

Post #8 by Harte3 » Wed Dec 13, 2017 7:43 pm

Getting heavy loaded light weight vehicles to stop is always a challenge. Getting down Lewiston or White Bird with them might get...exciting.
'83 F150 300, 0.030 over, Offy DP, Holley 4160/1848-1 465 cfm, Comp Cam 260H. P/P head, EFI exhaust manifolds, Walker Y Pipe, Super Cat, Turbo muffler, Recurved DSII, Mallory HyFire 6a, ACCEL Super Stock Coil, Taylor 8mm Wires, EFI plugs.

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Re: heaviest you've towed with a 300.

Post #9 by deere114 » Wed Dec 13, 2017 9:06 pm

While the gear vendors is nice (my 460 truck had one) your not supposed to engine brake with them. My plan is to take a np435 3rd gear set, which is 1.74 ratio, and flip it around to create a .74 overdrive ratio. 4th gear being 1.00 will be direct. I'm a tool and die maker, so machining anything isn't an issue. If it doesn't work out he'll buy the ranger torque splitter.

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Re: heaviest you've towed with a 300.

Post #10 by Wesman07 » Wed Dec 13, 2017 9:23 pm

Can you elaborate on this idea more?

Would this be an additional shaft? Or modified what's already there to shrink the gap?
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Re: heaviest you've towed with a 300.

Post #11 by 86f250straight6 » Wed Dec 13, 2017 9:34 pm

I have an 86 f250 with solid axle swap from a 99-03 super duty, and matching rear axle with disc brakes. 4.11 ratio with 33's. engine is a 1993 efi 6 bolted to an aod. truck weighs about 8-8500 with the bed and tools, have towed a bobcat /trailer close to 10k with no issues and no trailer brakes lol. have to climb hills in 3rd then shift to OD on the flats, but it gets it going from a dead stop no problem. with modern 4 wheel disc brakes its night and day from the original setup.

I know some farmers that have broken frames and burnt up clutches hauling way too much but never complained about the 6 not being able to pull it
I'm trying to build a truck that I can't break :bang:

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Re: heaviest you've towed with a 300.

Post #12 by deere114 » Thu Dec 14, 2017 8:01 am

Surprised that aod is holding up! My idea with the gear splitter is to take the two gears used for 3rd gear, and swap them into each others shafts. So the smaller gear which is normally driving the larger gear is now the one being driven by the larger gear. Effectively giving me a .74 overdrive ratio. I'll leave 4th as 1.00, and may even leave 2nd gear there to use as a low range if needed (his truck is 2wd) plan is to put this modified np435 in front of the tranny already in the truck, like the ranger torque splitter would be installed. I haven't actually done any measuring to see if those gears will swap shafts, but custom machining isn't any issue. Saves him a decent chunk of money not having to buy the ranger torque splitter.

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Re: heaviest you've towed with a 300.

Post #13 by Wesman07 » Thu Dec 14, 2017 9:59 am

Ah I understand now. That would probably push everything back pretty far
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86 f150 300 efi with advanced stock cam. Np435, Dana 60/ 10.25, 35" BFG's, four link front suspension with 12" travel fox coil overs, custom deaver leaf pack in the rear.

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Re: heaviest you've towed with a 300.

Post #14 by deere114 » Thu Dec 14, 2017 11:12 am

Whatever the length of a np435 is. It's a long bed truck with no transfer case so I'm not too worried about driveshaft length

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Re: heaviest you've towed with a 300.

Post #15 by Fordman75 » Thu Dec 21, 2017 11:17 pm

Lazy JW wrote:22,000 lbs CGVW with the rig in my profile picture. I prefer to not go over 20,000 lbs though. The real problem isn't getting it to go, it's getting it to STOP!


I learned that the hard way! I was hauling a 51 or 52 Ford F6 grain truck on a 20 foot car trailer behind a 2wd 86 F150 with a 300/NP435. It had no problem pulling it. But I was coming down this hill that ended at a busy 4-lane highway. Nothing like locking up 8 tires trying to stop before you plow into a bunch of vehicles doing 65 mph. I got it stopped about a foot into the intersection. That's what made me decide to stick with 3/4 or 1-ton trucks & vans for my work and tow vehicles.




The heaviest load I've hauled with a 300 was around 14,000 pounds ( not counting the truck ) . It was a load of scrap metal on a 20 foot trailer. I kept to the back roads and didn't drive much above 45 mph with it. That was me being a little paranoid and not wanting to loose any of the load.
Ted

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300, NP435 4spd, NP205 transfercase

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Re: heaviest you've towed with a 300.

Post #16 by Wesman07 » Tue Dec 26, 2017 1:58 pm

The heaviest thing Ive towed was a 30' motor home that was stuck in the bottom of a field. I have no idea what it weighed, but I would guess it was 3-4 times my truck.

I aired my 35" tires down to about 8psi, put it in 2nd gear 4 low and gave it a gentle tug.... tires just loaded up, all four tire slowly spun and that motor home didn't budge. I got out and told the driver "you might want to put your windows up, this is going to get messy". I got back in my truck, put it in 3rd 4 low and had at it! It felt like I was an astronaut taking off in NASA's first rocket. We were both painted brown, but I got him out of there!
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Re: heaviest you've towed with a 300.

Post #17 by Fordman75 » Tue Dec 26, 2017 4:30 pm

Wesman07 wrote:The heaviest thing Ive towed was a 30' motor home that was stuck in the bottom of a field. I have no idea what it weighed, but I would guess it was 3-4 times my truck.

I aired my 35" tires down to about 8psi, put it in 2nd gear 4 low and gave it a gentle tug.... tires just loaded up, all four tire slowly spun and that motor home didn't budge. I got out and told the driver "you might want to put your windows up, this is going to get messy". I got back in my truck, put it in 3rd 4 low and had at it! It felt like I was an astronaut taking off in NASA's first rocket. We were both painted brown, but I got him out of there!


You just need to be careful when pulling in 4-lo. I was pulling some cars out of a field with my old 83 Bronco. A couple had sat there for a decade or two. I was getting in a rush so I thought it would be a good idea to use grany low & 4-lo to try and get one out of it's hole. I got it out. But I also broke a motor mount and snapped the clutch linkage pivot ball right off the block! :oops: Torque plus gearing can = broken parts if you aren't careful. :D
Ted

54 Ford F100/F150 4x4
300, NP435 4spd, NP205 transfercase

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Re: heaviest you've towed with a 300.

Post #18 by Wesman07 » Tue Dec 26, 2017 6:21 pm

Fordman75 wrote:
Wesman07 wrote:The heaviest thing Ive towed was a 30' motor home that was stuck in the bottom of a field. I have no idea what it weighed, but I would guess it was 3-4 times my truck.

I aired my 35" tires down to about 8psi, put it in 2nd gear 4 low and gave it a gentle tug.... tires just loaded up, all four tire slowly spun and that motor home didn't budge. I got out and told the driver "you might want to put your windows up, this is going to get messy". I got back in my truck, put it in 3rd 4 low and had at it! It felt like I was an astronaut taking off in NASA's first rocket. We were both painted brown, but I got him out of there!


You just need to be careful when pulling in 4-lo. I was pulling some cars out of a field with my old 83 Bronco. A couple had sat there for a decade or two. I was getting in a rush so I thought it would be a good idea to use grany low & 4-lo to try and get one out of it's hole. I got it out. But I also broke a motor mount and snapped the clutch linkage pivot ball right off the block! :oops: Torque plus gearing can = broken parts if you aren't careful. :D


Your absolutly right! I would break a set of motor mounts every six months. It was always the passenger side that would go first. So it wasn't jumping on the throttle, it was the snap back that would do it. I.E. dragging a car with locked up wheels and then disengaging the clutch. I bet an auto trans would save motor mounts. I've changed my driving habits because of this situation, but it's not always easy to avoid.

I tried to replaced the 3/8 alloy pin with a 1/2" carriage bolt. It held up longer, but ripped the plate steel on the bottom of the mount after that motor home.

I forked out the money for the auto fab mounts and haven't had an issue since. But all that means is something else will probably give haha.
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86 f150 300 efi with advanced stock cam. Np435, Dana 60/ 10.25, 35" BFG's, four link front suspension with 12" travel fox coil overs, custom deaver leaf pack in the rear.

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Re: heaviest you've towed with a 300.

Post #19 by Welderhead » Mon Jan 15, 2018 6:29 pm

I got a 92 150 with 5spd 300 6 3.55 gears 8.8 at that i haul a 55b volvo excavator with hyd thumb it weighs 12980 on a 20 ft gooseneck with a 8*8 dumpbox on front of trailer. Factory springs 31.10.50/15 tires i crossed scales at TA truckstop just weighed trailer at 21,358lb

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Re: heaviest you've towed with a 300.

Post #20 by THE FRENCHTOWN FLYER » Mon Jan 15, 2018 7:30 pm

wow!
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Re: heaviest you've towed with a 300.

Post #21 by Rusty_Old_F250 » Mon Jan 15, 2018 7:36 pm

I haven't done any towing lately, but this was my weight with 2 yards of 5/8 minus:

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Re: heaviest you've towed with a 300.

Post #22 by Shorty » Mon Jan 15, 2018 8:40 pm

I hauled a dead kubota four wheel drive tractor with the loader on the ground down a gravel path last Thursday. Unsure of weight, but my truck runs 35 inch with 3.55 ratios and a c6 with a np 205, so the gearing isn't low at all. The engine has 400 000 and change kms on it. I put it in low, locked both front hubs on my welded dana 44 and barely cracked it above idle. The farmer was quite surprised how smooth and easy it pulled. Not the heaviest thing I have moved, but the most recent...It is nice and flat around here though which makes a difference
85 F150 on 78 bronco frame C6 np205 welded dana44 front, trussed posi nine inch rear. EFI exhaust manifolds into one 2 1/2" rolls on 35x12.5x15 Maxxis Trepador.

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Re: heaviest you've towed with a 300.

Post #23 by Motorboy » Mon Jan 15, 2018 8:51 pm

Not that heavy, but certainly harrowing (Warning Long Story)

My wife and i are horse people. We regularly trail ride at green lane park with friends. Our friend's have an '83 Ramcharger with a 4spd manual, blueprinted 318, msi atomic efi, and it revs to the moon. We don't own a trailer, so they haul our "ponies" in theirs. We are coming back from our ride on PA route 63 and there is a hill that has to be well over 20%. We are following them in my wife's 89 f-250, bone stock, c6 trans, 4.10 gears, 235/85r16 junkyard tires. The Ramcharger looses it's clutch 1/3 of the way up the hill. The cheep Harbor Freight wheel chocks don't hold and we are stuck in a dangerous and bad situation. We got creative with some tow straps and managed to get the trailer hooked up to the old ford. "Hub", as my wife call him, got 6500 lbs of horses and 2500 lbs of trailer up a really steep hill and all the way home. Our friends were flabbergasted that the inline six could pull so well. This is when is realized we didn't own a truck, but a street-legal tractor.

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Re: heaviest you've towed with a 300.

Post #24 by THE FRENCHTOWN FLYER » Tue Jan 16, 2018 9:15 am

Motorboy wrote:...we [don't] own a truck, but a street-legal tractor.

That should be a bumper sticker.
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Re: heaviest you've towed with a 300.

Post #25 by Wesman07 » Tue May 08, 2018 10:05 pm

I just weighed in with a trailer at 12,400 lbs. My truck empty weights 5,000 and I have 500 lbs of motorcycles in the bed.

With over a quarter million miles on this motor, I hope to make it from Philly to Coeur d’Alene. Three things I noticed:

1) I can maintain the same speed with the trailer empty or with 5,000 pounds in it. Wide open 90% of the time. The floor board feels the same either way.

2) I run colder... barley into to normal range with a 195 T stat. It only builds heat when I hold 3,000 rpm or more. * EDIT: that is false, there is a small voltage regulator in the dash cluster that is going wacky. Temp stays exactly where is should even running full tilt.

3) It’s surprisingly pleasant to tow with. I will hit a grade and think “I will need to down shift.... any minute now I will need to down shift... ok, maybe I don’t”

Electric brakes and 8 lugs axles absolutely necessary.
Last edited by Wesman07 on Fri May 11, 2018 11:37 pm, edited 3 times in total.
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86 f150 300 efi with advanced stock cam. Np435, Dana 60/ 10.25, 35" BFG's, four link front suspension with 12" travel fox coil overs, custom deaver leaf pack in the rear.

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Re: heaviest you've towed with a 300.

Post #26 by Lazy JW » Wed May 09, 2018 10:14 am

Wesman07 wrote:... I hope to make it from Philly to Coeur d’Alene...


Good luck and Welcome to Idaho! :D
"The White OX" 1974 F-350 300-6, Stock single exhaust, Carter YF, T-18A, Dana70 w/4.11, Flatbed dually w/dump bed. "Where no oxen are, the crib is clean, but much increase is by the strength of the ox" (Proverbs 14:4)
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Re: heaviest you've towed with a 300.

Post #27 by arse_sidewards » Wed May 09, 2018 2:17 pm

deere114 wrote:While the gear vendors is nice (my 460 truck had one) your not supposed to engine brake with them. My plan is to take a np435 3rd gear set, which is 1.74 ratio, and flip it around to create a .74 overdrive ratio. 4th gear being 1.00 will be direct. I'm a tool and die maker, so machining anything isn't an issue. If it doesn't work out he'll buy the ranger torque splitter.


So what ever happened with that?
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Re: heaviest you've towed with a 300.

Post #28 by THE FRENCHTOWN FLYER » Thu May 10, 2018 12:22 pm

Is the 3rd gear removable from the countershaft cluster?
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