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Ford F-Series Axle and Ratio Questions

17 messages,  Last post on Jul 28, 2008 at 10:30 AM

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What is this discussion about? Ford F-150, Ford F-250, Ford F-350, Truck

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#8 of 17 F-150 vs F250 axle and spring by 4belair Aug 16, 2006 (11:07 am)
I'm needing to change or rebuild the rear axle on my 84 F-150. Since sometimes I carry a 1500 lb slide in camper, I would like to upgrade to a F-250 rear axle and suspension. Does anyone know if this will fit right up to my F-150 frame? Replies to this message: racemech (Aug 16, 2006 2:30 pm)
#9 of 17 Re: F-150 vs F250 axle and spring [4belair] by racemech Aug 16, 2006 (2:30 pm)
Replying to: 4belair (Aug 16, 2006 11:07 am) You should be able to. The one difference will be if you use a heavy duty rear or not. The heavy duty rear may be a floating rear. And 8 lugs vs 5 lug.
#10 of 17 1999 F150 AXLE RATIO by gasa765 Mar 15, 2007 (10:49 am)
I have a 1999 F150, with 4.6L V8, supercab, auto transmission. The code for the axle ratio is H9. When I called a Ford service dept, they told me they could only check back to 2000, but the H9 indicated a 3.55 axle ratio. I checked the owners manual and couldn't find anything. Can anyone verify the H9 is a 3.55 for a 1999? The reason I'm asking is depending on what the axle ratio is help determine how big of a travel trailer we can buy. Replies to this message: wpalkowski (Mar 16, 2007 4:18 am)
#11 of 17 Re: 1999 F150 AXLE RATIO [gasa765] by wpalkowski Mar 16, 2007 (4:18 am)
Replying to: gasa765 (Mar 15, 2007 10:49 am) Get your VIN # and enter it into this Web site.   Should break it down to tell you what all the numbers mean along with the axle ratio:   Ford VIN Decoder
#12 of 17 5.4v8 with 3.31 axle ratio by gregkay Mar 28, 2007 (1:21 pm)
I have a ford 2006 reg cab stx package with a 4.6v8 and 3.55 axle. They are now offering a 5.4v8 with a 3.31 axle. Obviously more horsepower, but better fuel economy? how about towing comparisons? engine life, etc? Comments would be welcome. thx, -g Replies to this message: want2go2 (Jul 17, 2008 8:42 pm)
#13 of 17 5.4 is much better engine than the 4.6 2v by mschmal Mar 30, 2007 (10:47 am)
It has vari-valve timeing, electronic throttle. this gives comparable gas milage.   Mark.
#14 of 17 Rear End Switch for 92 F350 by lphilips Nov 15, 2007 (12:40 pm)
I've got a 92 F350 that needs a new rear end. The axle has the following markings:   B124 D 3.55 10 2 2C02   I've found a junk F250 with the floating rear end (8 lugs) same as my current rear end but markings on the end of the hub are different. The axle markings are:   S125 P 3.55 10 2 7F23   Hub markings for old and new axle are:   old: 5T8 CA / A55 MW new: 5T8 CA / DO DF   Measurements from backing plate to backing plate and leaf spring center to leaf spring center are the same.   It appears the gear ratios are the same. Does anyone know if this axle will work?
#15 of 17 '72 F-350 long wheelbase by cayoterun Jan 21, 2008 (8:44 pm)
Hi, new here and first post:   I'm needing to put the highest differential gear ratio in this truck. Does anyone know the highest ratio available for them. I'd like as close to 3. as I can. Putting a low max rpm, high torque motor in front of it. No heavy use on it tho, just hiway use, with light loads. Thanks, Cayoterun
#16 of 17 Re: 5.4v8 with 3.31 axle ratio [gregkay] by want2go2 Jul 17, 2008 (8:42 pm)
Replying to: gregkay (Mar 28, 2007 1:21 pm) Have you received any reply's on your post. I just took delivery of a 5.4 V8 F-150 and found out it has a 3.31 axle ratio. I don't know if thats good for towing about 4400 lbs Do you know if a 3.55 would be better for all around towing and regular driving. Thanks.
#17 of 17 towing ability of F150 by campman1 Jul 28, 2008 (10:30 am)
Have 2003 F150, 4.6L, rear axle ratio of 3.08...How much can I tow, e.g. a small camping trailer....what about tongue weight? Should I consider changing the axle ratio? Thanks

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