anyone with f250 and 3.55 rears? i need info - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 10-08-2012, 06:57 AM Thread Starter
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anyone with f250 and 3.55 rears? i need info

Hi. I have an acquaintance that has an f250 xclb 4wd e4od and stock tires. He has 3.55 rears. Only mods he says he has is a chip and exhaust, no intake mods. He swears he gets 25-29mpg. I have same truck but with 4.10 . I have located a 1996 donor truck that has only 129k. It has psd, zf5 and 3.55 rears. I am thinking about buying it and swapping rears and tranny and have an xtra 7.3.
Anyone have this setup? If so, what mileage do you get and what rpms are you turning while going 65mph. Also, i do 90%that highway driving. Anyone think my acquaintance is not telling the truth? I dont want to spend the time and money for this if it is not going to get me some substantial results. Thanks

1997 f250hd xtra cab 4wd lb. Psd. Ccv mod, superchip.
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post #2 of 13 Old 10-08-2012, 07:37 AM
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I have 3.55 gears in mine and I get around 20 mpg. I'd you do a lot of highway driving they are good doing 65 I'm at roughly 2000 rpms but for towing I would stay with the 4.10 gears. If the truck is 4x4 you will have to swap front ends also

95 f250 eclb 4x4 under construction
96 f250 eclb 4x4 rosewood stage 1 injectors, bully dog 6 position chip, 6637 air filter, idm mod
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post #3 of 13 Old 10-08-2012, 07:46 AM
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16 in town with 355 and 35s

2008 f250 king ranch ccsb: spartan ndash, s&b cold air intake, 4" turbo back flo pro exhaust, amp research steps, 8" rough country lift (atleast front for now), 24x13" fuel hostages ptm on 38" nitto trail graps.
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post #4 of 13 Old 10-08-2012, 08:03 AM
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Originally Posted by blacksmoke powerstroke View Post
16 in town with 355 and 35s
I am in the same boat.

Gerry

'97 CCSB f-250 4x4 auto, 6pos chip w/ canned tunes, AFE intake, 4 in exhaust, 3in dp, 3.55 gears,
Dana 60 rebuilt and waiting to be installed
184k
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post #5 of 13 Old 10-08-2012, 08:29 AM Thread Starter
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Hi. Thanks for responses. I only tow about 3-4 times per year pulling my camper which weighs only 6000. I am just tired of paying 2 insurances and 2 property taxes. I'd like to only have one vehicle that does what i need.

1997 f250hd xtra cab 4wd lb. Psd. Ccv mod, superchip.
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post #6 of 13 Old 10-08-2012, 08:56 AM
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I've got a 350 all stock 355's auto 2wd rolling half highway half city i get about 19-20

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post #7 of 13 Old 10-08-2012, 10:06 AM
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I get 14-16 max.

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post #8 of 13 Old 10-08-2012, 04:10 PM
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I call BS on the 29 MPG, Two F250 4x4 5-speeds, both 3.55s with stock 235/85R16s, both with 6637 intakes and stock exhaust, one ECLB, one RCLB, best we ever got was 23 in the RCLB. Usu. 19-20 mixed driving. With a downpipe and no-kitty exhaust, and a chip on Economy, I could imagine 25-26. But 29? Only if the whole trip is downhill and with the wind, and even that says maybe.
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post #9 of 13 Old 10-08-2012, 04:36 PM
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Ive got 285's chip, intake, exhaust and the best ive ever gotten was 22 unloaded at 65. Rpm's about 1700

tony

1997 F250 4.10's
D60 swap/mag-hytec rear diff. cover
ts 6 pos./Autometers
melling LPOP/T-500 HPOP
D66 w/1.0 housing and WW2
160/80 rosewoods/bellowed up-pipes
08 king ranch seats/center console
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post #10 of 13 Old 10-09-2012, 07:03 AM
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BS he's not getting 29mpg. Closer to 25mpg, MAYBE... if he's driving super light, truck is in tip top shape, and he's going 55mph on the highway.

My 35's/6" truck gets 18mpg city.
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