which rear axle - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 06-23-2007, 04:26 PM Thread Starter
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which rear axle

my truck is a 2004 350 cc dually with 60000 miles and i need a pinion seal already. i know its a dana but which one. is it the 80 and what ring gear is it.

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post #2 of 13 Old 06-23-2007, 08:18 PM
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I suggest finding the axle code on the drivers door frame and then posting or google'ing the code. That should tell you what you need to know.

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post #3 of 13 Old 06-23-2007, 08:21 PM
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I am pretty sure its an 80 but the gearing could be 3.73 or 4.10 I agree you would have to check the axle code or the door sticker

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post #4 of 13 Old 06-23-2007, 08:28 PM
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it should be a 4.10 but look at the lil tab on the axle and it will tell you

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post #5 of 13 Old 06-23-2007, 09:36 PM
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It's a Dana 80. Should be 4:10. I think my axle code is C5 but I cant remember and mine is D80 with 4:10 gears.

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post #6 of 13 Old 06-23-2007, 10:02 PM
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ok I don't know where I got that code from cause I checked mine and it is not listed on the sticker, but you can check this site out and it shows the code/ratio plus where to look on the rearend if it is not listed

Automotive What is my Ford rear end ratio, do I have positraction

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post #7 of 13 Old 06-24-2007, 05:59 AM
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that dually should be a 4"10 rear for sure.

im still alive and kickin...find me on FB..."StrokerX1"
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post #8 of 13 Old 06-24-2007, 06:03 AM
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not all the duallies are 4.10s we had two at work that had 3.73 rears an early 99 and an 01

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post #9 of 13 Old 06-25-2007, 06:08 PM Thread Starter
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ok so i found out that i have the dana 80 4.10 with 11.25 inch ring gear. im going to try and install a new pinion seal this week. all the fords ive ever seen have a leak at the pinion seal. anyone tried this and who's seal did you use. i got one from napa for 19 bucks. i hope it lasts longer than the factory one did. oh i found out that i need to get some real tools for this job. the baby tools i have are not going to cut it for this truck. what size is that pinion nut anyway. looks like a 2 inch to me.

2004 Ford King Ranch
Crew Cab Dually
Chestnut Metallic
6.0 Diesel
PS2 with Customized Caddy
MBRP 4" Dual Exhausts
Zoodad Mod
Cat Delete Pipe
ARP Headstuds
Muffler Delete Pipe
ISSPRO Enhanced Visibility White Faced Blue Pointers
Boost, Pyro, Trans, Rear Diff
SCT LIVEWIRE(custom tunes later)
Mismatched Camper Top
:burnout
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post #10 of 13 Old 06-25-2007, 06:13 PM
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I think it is 1 15/16. I've done it on my F250 and my old F350 but can't remember. On both I've used the napa seals and no problems after. I still need to replace the one on my 350 now.

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