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2004 - 2008 F150 2004, 2005, 2006, 2007 and 2008 Ford F150's with 5.4 V8, 4.6 V8 or 4.2 V6 engine
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  #1  
Old 10-05-2004, 08:13 PM
fanfare fanfare is offline
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differences in 355 vs 373 rear?

I got the 355 rear end ... I was wondering if anyone tows with this ratio. Because I don't plan on towing more than 7000 lbs I figured I would try to get better MPG under highway conditions (not when I'm towing of course) and was wondering if those who have 355's are happy with them. The dealership I bought from says he mostly gets 355's now (he may have gotten more 373's on earlier shipments) Can't seem to figure out why his later build inventory is mostly 355. He says he orders 355's now ... but who knows what the real rason may be.
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Old 10-05-2004, 09:11 PM
FX4dude FX4dude is offline
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I don't have a 3.55 but I like to tell all of you what happened to me regarding this choice.

I wanted to order my truck with a 3.55 because I thought it would get better gas mileage and have lower RPM's while crusing on the highway.

To make a long story short, I had to take the 3.73 when I purchased my truck. Now, I'm glad I got the 3.73.

Highway crusing with 3.73: The stock truck cruised under 2,000 RPM. Great!

Gas mileage comparision between the 2 rearends: I don't know? The number might be small. Driving habits may affect gas mileage more.

Ok, on to the good news. I have taller tires now and the 3.73 is quicker off-the-line than the 3.55. I have heard of some guys wanting to re-gear their rearends to 4.10's or higher after a lift and tire change.

I think my truck is great with a 3.73 rear, 315/70/17 tires, and a Superchips programer.

Just my 2 cents.
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Last edited by FX4dude; 10-05-2004 at 09:21 PM.
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Old 10-05-2004, 09:19 PM
DirtyDiesel DirtyDiesel is offline
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i am in thwe market for a 04 150 and this is good to know thanks
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  #4  
Old 10-05-2004, 09:50 PM
bigdavewilson bigdavewilson is offline
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Gear ratio

Quote:
Originally Posted by fanfare
I got the 355 rear end ... I was wondering if anyone tows with this ratio. Because I don't plan on towing more than 7000 lbs I figured I would try to get better MPG under highway conditions (not when I'm towing of course) and was wondering if those who have 355's are happy with them. The dealership I bought from says he mostly gets 355's now (he may have gotten more 373's on earlier shipments) Can't seem to figure out why his later build inventory is mostly 355. He says he orders 355's now ... but who knows what the real rason may be.
My 02 with 5.4 had the 3.73 rear end and I did use it a bit for towing a relatively heavy trailer. Seems to me most of the time I locked out the O/D anyway. My 04 has the 3.55 with 265/17 tires replacing the factory 255/17's.Although I haven't towed anything bigger than a 14' boat my guess is that the new truck would be better overall in that it runs at lower rpm with O/D locked out. The new 3 valve motor does seem appreciably stronger and it gets better fuel economy by about 10 to 15%. I'm more that happy with the 3.55's (which because of the bigger tires is more like 3.50).
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Old 10-06-2004, 02:11 AM
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Birdhunter1 Birdhunter1 is offline
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Quote:
Originally Posted by FX4dude

Highway crusing with 3.73: The stock truck cruised under 2,000 RPM. Great!
What kind of speed are you rrunning, 70-80 mph?
On my 3.55 rear with a 4.6 engine I can run 80 at just a hair under 2000 rpm's. 55-60 is the sweet spot for gas mileage though. 70 mph is about 1800 rpms.
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Old 10-06-2004, 06:42 AM
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scottb1014 scottb1014 is offline
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I have 3.55 now, and will be upgrading to 4.10 once my suspension lift goes on next week. I also have 315/70/17's on there now.

Just with a leveling kit and the bigger tires, my get up and go is less than desirable. So im looking for best deal to do gears after my lift goes on.
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Old 10-06-2004, 11:14 AM
dentexman dentexman is offline
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FANFARE, I have a Lariat SCrew with the 3.55. I towed my 4,000 lb. camping trailer with five of us in the cab and five bicycles in the bed to Yellowstone this summer (from TX). It towed fine. I turn OFF the overdrive unless I have a tailwind and level or downsloping terrain. I averaged about 11 MPG and used the air conditioning occasionally.
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Old 10-06-2004, 06:02 PM
FX4dude FX4dude is offline
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Quote:
Originally Posted by Birdhunter1
What kind of speed are you rrunning, 70-80 mph?
On my 3.55 rear with a 4.6 engine I can run 80 at just a hair under 2000 rpm's. 55-60 is the sweet spot for gas mileage though. 70 mph is about 1800 rpms.

I believe it was 75 MPH.
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Old 10-06-2004, 06:02 PM
 
 
 
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