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It looks to me like the 6R100 will get the trailer rolling faster than the 6R140 and then offer ever so slightly better fuel mileage in 3rd through 6th gears.
I'm going to pair this transmission with the 4.30 diff and 20 inch wheels.
With the 4:30s you’ll be in the torque band no problem. I would bet the mileage difference empty and that axle ratio would be negligible. Second truck, or trading
in the beast?
It looks to me like the 6R100 will get the trailer rolling faster than the 6R140 and then offer ever so slightly better fuel mileage in 3rd through 6th gears.
I'm going to pair this transmission with the 4.30 diff and 20 inch wheels.
Here are the two transmissions’ gear ratio specs. The 6R100’s shorter first gear and higher stall ratio TC should help get things moving from a dead stop. The 6R140’s fifth- and sixth gears are actually a bit longer, which might help a bit with fuel economy.
If the camper package is of interest to you, you can’t get it with 20” wheels.
Another factor in the 250 vs 350 comparison is the rear spring packs, rear GAWR, payload, and GVWR.
Here are the two transmissions’ gear ratio specs. The 6R100’s shorter first gear and higher stall ratio TC should help get things moving from a dead stop. The 6R140’s fifth- and sixth gears are actually a bit longer, which might help a bit with fuel economy.
If the camper package is of interest to you, you can’t get it with 20” wheels.
Another factor in the 250 vs 350 comparison is the rear spring packs, rear GAWR, payload, and GVWR.
HTH,
Jim / crewzer
The chart above is wrong for fluid capacity of the 6r100. It is actually 13.9 quarts.
For durability the 6r140 hands down it's a real truck transmission. The 6r100 is great for quicker shifts but not heavy duty use. The 6r100 is nothing more than a upgraded 6r80 that was used in the F150.
With the 4:30s you’ll be in the torque band no problem. I would bet the mileage difference empty and that axle ratio would be negligible. Second truck, or trading
in the beast?
Truly, I'm not too worried about fuel mileage, but the two models are so close that this is what I'm down to trying to pick one over the other.
I'm getting close to 100,000 miles on my truck, and even though it has been an awesome, completely trouble free truck, I'm wanting to get out of the pulling business, so I'm trading it in.
Originally Posted by SDcrewzer
Q
Here are the two transmissions’ gear ratio specs. The 6R100’s shorter first gear and higher stall ratio TC should help get things moving from a dead stop. The 6R140’s fifth- and sixth gears are actually a bit longer, which might help a bit with fuel economy.
If the camper package is of interest to you, you can’t get it with 20” wheels.
Another factor in the 250 vs 350 comparison is the rear spring packs, rear GAWR, payload, and GVWR.
HTH,
Jim / crewzer
Thanks, that does help. I was unable to locate a chart that laid it out side by side like that.
I have a 9000 lb. travel trailer and a 32 foot boat. That's all this truck is ever going to pull, so I'm avoiding all the suspension "upgrades". No snow plow, no camper certificate, no 5th wheel prep etc.
I am going with the long bed for the larger fuel tank and upfitter switches because I've never had them and want them,
2019 F250 Lariat Ultimate 6.2L
Originally Posted by cattaco
The chart above is wrong for fluid capacity of the 6r100. It is actually 13.9 quarts.
The 250 camper package has the 350 rear springs. I’m sure you’ve seen that. The gas SRW trucks all use the 10.5 rear Ive read.
One other thing I was gonna mention is you can get an aftermarket 55 gallon tank if you want the crew cab short bed; but not sure if they certify it for Gas. Around $1200 in parts. The long bed is a couple hundred more bucks and has 48 gallons so if you don’t mind the length probably a good bet.
I went with the Lariat F350. I wanted a bulletproof combination. The 6R100 may be a great transmission but I feel warm and cozy with the 6R140 I also have the 4.30s and when given the go pedal it's a rocket.... also smooth as silk on the road. Very surprised for a one ton. I'll be pulling a 32 TT with a dry weight of 8400. My old 06 2500HD with 6.0 pulled it fine although a few slowdowns in the hills of VA but totally managable. I expect a lot more from this rig come this summer.
The 250 camper package has the 350 rear springs. I’m sure you’ve seen that. The gas SRW trucks all use the 10.5 rear Ive read.
One other thing I was gonna mention is you can get an aftermarket 55 gallon tank if you want the crew cab short bed; but not sure if they certify it for Gas. Around $1200 in parts. The long bed is a couple hundred more bucks and has 48 gallons so if you don’t mind the length probably a good bet.
Actually the camper package on the F250 only gives an overload. Making it 3 leafs and 1 overload leaf. Total 4. The F350 without 17in rims has 4 std leafs and the overload stock making 5 leafs.
