4.10'S to 3.55's??
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I've considered going from 3.55 to 4.10 just for the added "Umph". I'm going back to the taller factory 235/85R-16 (load range E) tires for the added capacity/towing and I think the 5.8L would appreciate the added gear reduction. Drive your truck over and we'll swap!, LOL.
When I do my SAS next spring it will have 4:10 for sure.
#6
I switched to P255/70R16's (~30.5" tall) last fall and the truck really seemed to like the smaller diameter tires. They also rode, drove & handled a ton better than the tall, narrow & stiff factory tires, but the load capacity was not quite on par with my 250HD. Unfortunately, the tires are about worn out now and I plan on doing some more towing & hauling, so it's back to the original LT235/85's. I would love to buy a new set of LT245/75's (best of both worlds) but I don't have the money for new tires right now.
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#8
i have a friend who had 2 separate trucks, both with the 460 engine & automatics...one truck had 4.10 gears and the other had 3.55 ratio...He got an honest 7 mpg better with the 3.55 ratio....the 4.10 truck got 10 mpg and the 3.55 ratio ran 17 mpg. I am looking to do this exact thing with my 89 F350 with a powerstroke/auto implant...The donor truck & the F350 both have 4.10.....I want over the road milage.... I have another friend running a 95 F350 crewcab single rear wheel with the powerstroke/auto...&3.55 from factory...He gets 26.3 running form CA to AZ on the open freeway....
#9
i have a friend who had 2 separate trucks, both with the 460 engine & automatics...one truck had 4.10 gears and the other had 3.55 ratio...He got an honest 7 mpg better with the 3.55 ratio....the 4.10 truck got 10 mpg and the 3.55 ratio ran 17 mpg. I am looking to do this exact thing with my 89 F350 with a powerstroke/auto implant...The donor truck & the F350 both have 4.10.....I want over the road milage.... I have another friend running a 95 F350 crewcab single rear wheel with the powerstroke/auto...&3.55 from factory...He gets 26.3 running form CA to AZ on the open freeway....
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Intresting about the 3.55 giving better MPG. I might have to do more thinking about that swap on my E350 RV/bus conversion with a 460/e4od in it. I was getting 8.5mpg up till start of this year and its now down to 6.7mpg.
I think the engine is getting into it's peak torque range with the 3.55 gears, with 4.10's its running over the peak torque hence poorer MPG
I think the engine is getting into it's peak torque range with the 3.55 gears, with 4.10's its running over the peak torque hence poorer MPG
#12
Intresting about the 3.55 giving better MPG. I might have to do more thinking about that swap on my E350 RV/bus conversion with a 460/e4od in it. I was getting 8.5mpg up till start of this year and its now down to 6.7mpg.
I think the engine is getting into it's peak torque range with the 3.55 gears, with 4.10's its running over the peak torque hence poorer MPG
I think the engine is getting into it's peak torque range with the 3.55 gears, with 4.10's its running over the peak torque hence poorer MPG
#13
Then you can just swap the whole rearend and it costs a days labor, some beer and a little money for unexpected problems. Otherwise, I agree. If you went from 10mpg to 13mpg, it would take ~11,000 miles to recoup a $1000 at $3.85/Gal. That's a years worth of driving for some people. The money is better spent on a quality tune-up or on a $800 "beater" Ranger or something that get 2X the MPG.
#14
Having an OD trans seems to help equalize the MPG differences between different gear ratios.............as opposed to older vehicles with only a direct final gear. In the Mustang world, most guys go from 3.27 to 3.73 or 4.10 and only see a 2-3 MPG decrease at highway speeds. A lot of them, however, report the same or even better MPG in city driving.
#15
Having an OD trans seems to help equalize the MPG differences between different gear ratios.............as opposed to older vehicles with only a direct final gear. In the Mustang world, most guys go from 3.27 to 3.73 or 4.10 and only see a 2-3 MPG decrease at highway speeds. A lot of them, however, report the same or even better MPG in city driving.