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Ford F-Series Axle and Ratio Questions

21 messages,  Last post on Sep 16, 2010 at 10:24 AM

You are in the Ford F-Series Forum.

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

Messages Page 3 of 3

#12 of 21 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

#13 of 21 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 21 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 21 '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 21 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 21 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

#18 of 21 Rear Axle Rebuild by snowbrdjnky

Apr 04, 2009 (8:53 pm)

Im not sure if this is the correct spot to put my question, but i will try it and hope for the best. I am trying and learning to rebuild my rear axil. This is the first place i thought of for help. Its off of a 1978 F 150. It has a 3rd member. I am having trouble removing the bearing on both (FORGIVE MY TERMINOLOGY) shafts going to each rear tire. there is a press on stop of some sort that i can not remove. Any any information would be greatly appriciated. On any aspect of the rebuild.

#20 of 21 9" Ford Axle spline determination by spartan74

Apr 22, 2010 (12:20 pm)

I've got a older Ford axle with 9" third member in my project car. The current gears are 4:56's and I'm wanting to switch to a 3:50. My axles are the 28 spline style and I'm searching for a salvage yard third member with those gears. My salvage yard sells complete assembled rear end and doesn't break them down just to look at spline count because at that point they can't sell as a complete assembled axle.. They've got several Ford pickups with these older 9" rear ends but don't know which ones have the 28 or 31 splines. Is there anyway to tell, without dissasembly, which axles are in each P U ?
Because of different axle widths and bearing diameters I'm not sure if any would be interchangable with my axle tube..

#21 of 21 2002 f-150 rear end by higinbotham

Sep 16, 2010 (10:24 am)

my rear end locked up on my 02 f150 and it has the 3.08 non-LS gears in it and i was wondering if the rearend would work off of a 2000 f-150 with 3.55 gears in it and would everything bolt up the same

Messages Page 3 of 3

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