What axle do I really have?
Thread Starter
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Freshman User
Joined: Jul 2007
Posts: 37
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What axle do I really have?
The question that seems to keep coming up week after week is
" What is the difference between a F250 and a F350"
Here it is:
There are 3 differences between the SRW 250/350...
1) F-250 vs F-350 badges
2) 2" rear spacer block in 250 vs 4" in the 350
3) *most important* GVWR for F350 SRW is 9900 in most states and the F250 8800 in most states.
From 99 to mid 2001 the srw trucks came with a Dana 50, Ford started using the Dana 60's on all F250/350's from mid 01 to present ,the front axle is identical on both trucks, including springs.
Springs in the Source Book are EXACTLY the same:
Front Leaf 250/350
3600lb 1.12"(thickness) 55.63"(length) 3.00"(width) 350(deflection)
4000lb 1.18"(thickness) 55.63"(length) 3.00"(width) 370(deflection)
4400lb 1.18"(thickness) 55.63"(length) 3.00"(width) 390(deflection)
4800lb 1.18"(thickness) 55.63"(length) 3.00"(width) 410(deflection)
5200lb 1.18"(thickness) 55.63"(length) 3.00"(width) 430(deflection)
6000lb 1.25"(thickness) 55.63"(length) 3.00"(width) 470(deflection)
Rear Leaf 250/350
6830lb 6(leaves) 3.86(thickness @ pad) 58.1"(lenght) 3.00"(width) 320/670/1209(deflection lbs/sq") 3603(rating@pad lbs/spring)
Rear leaf DRW
8250lb 6(leaves) 3.95(thickness @ pad) 58.1"(lenght) 3.00"(width) 350/730/1270(deflection lbs/sq") 4187(rating@pad lbs/spring)
I was told that my 2003 F250 4x4 5.4l has a dana 50 front but this post says I have a dana 60. What is the correct answer? I have looked at my axle housing and the diff itself and cannot find where it was stamped in. Somebody please let me know because I am going to be re-gearing and installing a locker soon.
Kevin
" What is the difference between a F250 and a F350"
Here it is:
There are 3 differences between the SRW 250/350...
1) F-250 vs F-350 badges
2) 2" rear spacer block in 250 vs 4" in the 350
3) *most important* GVWR for F350 SRW is 9900 in most states and the F250 8800 in most states.
From 99 to mid 2001 the srw trucks came with a Dana 50, Ford started using the Dana 60's on all F250/350's from mid 01 to present ,the front axle is identical on both trucks, including springs.
Springs in the Source Book are EXACTLY the same:
Front Leaf 250/350
3600lb 1.12"(thickness) 55.63"(length) 3.00"(width) 350(deflection)
4000lb 1.18"(thickness) 55.63"(length) 3.00"(width) 370(deflection)
4400lb 1.18"(thickness) 55.63"(length) 3.00"(width) 390(deflection)
4800lb 1.18"(thickness) 55.63"(length) 3.00"(width) 410(deflection)
5200lb 1.18"(thickness) 55.63"(length) 3.00"(width) 430(deflection)
6000lb 1.25"(thickness) 55.63"(length) 3.00"(width) 470(deflection)
Rear Leaf 250/350
6830lb 6(leaves) 3.86(thickness @ pad) 58.1"(lenght) 3.00"(width) 320/670/1209(deflection lbs/sq") 3603(rating@pad lbs/spring)
Rear leaf DRW
8250lb 6(leaves) 3.95(thickness @ pad) 58.1"(lenght) 3.00"(width) 350/730/1270(deflection lbs/sq") 4187(rating@pad lbs/spring)
I was told that my 2003 F250 4x4 5.4l has a dana 50 front but this post says I have a dana 60. What is the correct answer? I have looked at my axle housing and the diff itself and cannot find where it was stamped in. Somebody please let me know because I am going to be re-gearing and installing a locker soon.
Kevin
Thread Starter
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Freshman User
Joined: Jul 2007
Posts: 37
Likes: 0
Hey, Thanks for the help. Another question I had was what gearing should I go for if I plan to have 37s on the truck soon. It has the 5.4l in it. Right now it has the stock 3.73 gears in it. I am not too worried about fuel economy but I dont rock crawl at all and I wont really ever tow a lot of weight.
Thanks,
Kevin
Thanks,
Kevin
Lead Driver
Joined: Sep 2003
Posts: 5,844
Likes: 6
From: Albuquerque
Recommendations: Go either 4.56's or 4.88's.
If you are not going to tow at all or very little, then go with the 4.56's. Some or a lot of 6000lbs or more towing...and the 4.88's will be your best bet.
TIP: PCM does not need to be reprogrammed for the new gears. Tires...are a different story.
Good luck with it...
biz
If you are not going to tow at all or very little, then go with the 4.56's. Some or a lot of 6000lbs or more towing...and the 4.88's will be your best bet.
TIP: PCM does not need to be reprogrammed for the new gears. Tires...are a different story.
Good luck with it...
biz
