Thanks .
Two Speed Diff for F350?
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From: McDonough US
Two Speed Diff for F350?
2002 F350 7.3L PS
Question, does anyone know of a good 2 speed diff for this truck? I'd like something along the lines of a 3.73 / 4.10
I currently have a straight 4.10, if I keep it right at 60MPH on the hwy, I get about 19+MPG, at 70 it drops to 16... beyond that and you can hear the bells as the $$ click off.
With the price of fuel today, every little bit counts.
Thanks,
Robert
Question, does anyone know of a good 2 speed diff for this truck? I'd like something along the lines of a 3.73 / 4.10
I currently have a straight 4.10, if I keep it right at 60MPH on the hwy, I get about 19+MPG, at 70 it drops to 16... beyond that and you can hear the bells as the $$ click off.
With the price of fuel today, every little bit counts.
Thanks,
Robert
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From: Cincinnati, Ohio
GEARVENDORS
US GEAR
Both make what you are after, you can check through and see what they offer.
Dave / Believer45
US GEAR
Both make what you are after, you can check through and see what they offer.
Dave / Believer45
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From: Leesburg , Fl.
RickyBR , one disadvantage is the price , these units are over $2K and if you have a 4x4 you can only use the overdrive while in two wheel drive . But if I had the cash I'd have one in my truck ! As far as two speed rearends I think they were built for larger trucks but not PUs ( that I know of ) There use to be a two speed rear called a Columbian but you had to crawl under the car to change . They were ment mainly for racing . I think I remember reading something about a company that was building or going to build a two speed axle , but it may have been in one of my day dreams ! It does sound like a good idea though . I think it would be cool to have a ten speed Road Ranger ( aka big truck ) but probably not too realistic in the real world .
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From: Cincinnati, Ohio
Blackf3504dr, I beg to differ but the US Gear site states the transmission goes between the primary transmission and the transfer case for both manual and automatic transmissions and requires modification of the floor pan to make it fit so it would work in four wheel drive. You are right about gear vendors , though, they specifically state it bolts to the back of the transfer case and is locked out in 4x4 mode so they cannot be used in four wheel drive.
Dave / Believer45
Dave / Believer45
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From: Leesburg , Fl.
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From: Cincinnati, Ohio
Blackf3504dr, I apologize if I stepped on any toes - that was not my intention at all.
Back to the question at hand, some folks have installed a three or four speed Brownie transmission which would give you underdrive - driect - overdrive (3 speed) or double under - under - direct - over (4 speed). These were auxiliary transmissions available in the past and would probably be found primarily in salvage yards. I rather like the idea of 20 forward and 4 reverse gears to choose from!! If you have a 4x4 this would require either relocating the transfer case or use only in two wheel drive except in direct.
Dave / Believer45
Back to the question at hand, some folks have installed a three or four speed Brownie transmission which would give you underdrive - driect - overdrive (3 speed) or double under - under - direct - over (4 speed). These were auxiliary transmissions available in the past and would probably be found primarily in salvage yards. I rather like the idea of 20 forward and 4 reverse gears to choose from!! If you have a 4x4 this would require either relocating the transfer case or use only in two wheel drive except in direct.
Dave / Believer45
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From: Leesburg , Fl.
That kinda reminds me of the old 5X4s where you had a 5 speed main with a 4 speed auxilary box ( double sticker ) . Some of the "old guys" could really shift them things ! It took both hands , you would shift the main box and almost simultaneosly shift the auxilary box . Oh ... My toes are fine believer45 , no apology needed !
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From: Cincinnati, Ohio
When I started out in trucking I ran across a guy who began with a Mack hauling overloads with a 6 backed by a 4 backed by another 4 - triple sticks. 96 forward gears, 16 reverse. I figure I get confused enough with just one handshaker sticking up out of the floor.
Anyway, back to the question at hand, from what I have read the GearVendors and US Gear units do well, one (but I cannot remember which) has a bit of difficulty with torque from engine braking so an exhaust brake may be a consideration.
Dave / Believer45
Anyway, back to the question at hand, from what I have read the GearVendors and US Gear units do well, one (but I cannot remember which) has a bit of difficulty with torque from engine braking so an exhaust brake may be a consideration.
Dave / Believer45
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From: Leesburg , Fl.
roger on the multiple sticks ! I always liked a 13 dbl over , no thinking involved . By the time I got through 96 gears I'd have to pull over and take myself a nap or do a lot of "skip shifting" !
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