Open rear diff???????
Senior User
Joined: Mar 2015
Posts: 326
Likes: 0
From: North Carolina-Foothills
I've got axle code 39. Should be 3.55's. I had a LS in 8.8 in my 2003 Mustang. It would give up a little. Then I changed the 3.23 to 3.73 and re-shimmed and and installed new clutch disks. It would lay 2 very nice black lines down, with I think the drivers side fading barely before the passenger. I know LS diff clutches and springs can wear, but this thing acts like straight open diff. I searched this and a couple other forums, and guys where talking about welding the diff, and buying LS diffs, which led me to believe that open diff's did exist in these trucks.
Why it was a good idea to put an open rear diff in a 3/4ton truck I will never know...but it happens. Unfortunately for me when i bought the truck I didn't realize it was even an option. Live and learn I guess, I am in the process of hopefully getting a Detriot Trutrac put in mine, when I noticed about an hour ago they were for the the full float axle only, now I am hoping someone can tell me if I have the full float or semi float just by checking out my door tag...
Still love my truck,
all the way..but I really hope its a full float axle or I gotta come up with another solution.....
Senior User
Joined: Mar 2015
Posts: 326
Likes: 0
From: North Carolina-Foothills
Plus the cost of having someone install it...ouch..I wanna say I can do it...but you guys have seen my dummy posts...so .....(that and I am still working 70+hrs a week at the job, not including round the 'farm' so time is not on my side)
Senior User
Joined: Mar 2015
Posts: 326
Likes: 0
From: North Carolina-Foothills
Sorry to have hijacked your thread..but this whole will it work in a semi float or does it have to be a full float question is annoying me...that and at 4:44 am I am not going out to the truck to see which I have..so I contacted Eaton support...perhaps they can answer if it works in either axle....
Just noticed the whole full float only thing while looking at prices and a few of the sites said full float axle only for the true trac....that is what took me down this path...that and perhaps lack of sleep...
Just noticed the whole full float only thing while looking at prices and a few of the sites said full float axle only for the true trac....that is what took me down this path...that and perhaps lack of sleep...
Hotshot
Joined: Dec 2005
Posts: 14,377
Likes: 609
From: evansville in
Toby you have a full floater. Luckily ford in this era didn't do that half baked 3/4 ton axle like my dodge has.
Also if not changing ratios and there isn't anything wrong you can prob skip the bearing kit. You would only need the carrier side bearings. Check before buying as some aftermarket carriers take specific special bearings. I have not researched to know if the Detroit does or not.
Also if not changing ratios and there isn't anything wrong you can prob skip the bearing kit. You would only need the carrier side bearings. Check before buying as some aftermarket carriers take specific special bearings. I have not researched to know if the Detroit does or not.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Thread Starter
|
Senior User
Joined: Oct 2015
Posts: 320
Likes: 8
I'm not sure what you mean by full float, or semi- float?
I went to a salvage yard yesterday. I needed the turbo intake boot, and Ford wanted $100. WHATTTT!
Anyways, I'm at the salvage yard and looked at three 250 and 350 trucks, all axle 39, and a fourth axle 35. I'm betting a C9 will be danged near impossible to find.
I went to a salvage yard yesterday. I needed the turbo intake boot, and Ford wanted $100. WHATTTT!
Anyways, I'm at the salvage yard and looked at three 250 and 350 trucks, all axle 39, and a fourth axle 35. I'm betting a C9 will be danged near impossible to find.
Thread Starter
|
Senior User
Joined: Oct 2015
Posts: 320
Likes: 8
So, there is a hub of sorts at the wheel, and the axle shaft just slides into it?
Senior User
Joined: Mar 2015
Posts: 326
Likes: 0
From: North Carolina-Foothills
Toby you have a full floater. Luckily ford in this era didn't do that half baked 3/4 ton axle like my dodge has.
Also if not changing ratios and there isn't anything wrong you can prob skip the bearing kit. You would only need the carrier side bearings. Check before buying as some aftermarket carriers take specific special bearings. I have not researched to know if the Detroit does or not.
Also if not changing ratios and there isn't anything wrong you can prob skip the bearing kit. You would only need the carrier side bearings. Check before buying as some aftermarket carriers take specific special bearings. I have not researched to know if the Detroit does or not.
Read your post Aaron and saw this on Wiki
So I generally take your advice and knowledge and run with it Aaron, but before I drop $500 + bucks is there an easy way I can visually double check that I don't have some rare hardly seen in a F250 semifloat...??
I hope this is one of those Aaron in generally right cases.
Thanks in advance
Logistics Pro
Joined: Oct 2008
Posts: 4,818
Likes: 1
From: Avilla, IN
My white truck, which is the winter beater, has the open diff. Its nice cause if you get on it too hard you only break one tire loose and continue going in the direction that you want. That is the only benefit I know of.
If anyone out there isn't happy with how the LS is functioning I'd suggest changing the fluid and be sure to add the correct amount of the friction modifier.
If anyone out there isn't happy with how the LS is functioning I'd suggest changing the fluid and be sure to add the correct amount of the friction modifier.