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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Rear differential type?

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Old Mar 23, 2022 | 04:52 PM
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Rear differential type?

I have a 1989 F150 2wd 5 speed. I have 3.08 gears but when I jack up the rear end and turn one wheel the other does not turn either direction. Is my rear end have an issue or can the brakes be dragging a bit? Thanks!
 
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Old Mar 23, 2022 | 05:26 PM
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Do you have the trans in neutral or in gear? With the trans in neutral the driveshaft will turn and the other wheel may not, but if the trans is in gear the driveshaft cannot move so the other wheel has to.
 
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Old Mar 24, 2022 | 07:55 PM
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Originally Posted by Conanski
Do you have the trans in neutral or in gear? With the trans in neutral the driveshaft will turn and the other wheel may not, but if the trans is in gear the driveshaft cannot move so the other wheel has to.
Thank you much. Diagnosed this one as 30% me being an idiot and 70% trying to get the gear ratio identified and get the truck back down to leave for work. Lol
 
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Old Mar 24, 2022 | 09:55 PM
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... and you probably have an open diff. If you had a limited slip and the trans is in neutral it's most likely that the other tire would turn the same direction and speed as the tire you are turning.
 
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Old Mar 25, 2022 | 07:00 AM
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If you have a rear axle tag you can tell if its limited (from factory) which is a clutch type If Im to be believed, which can wear out. But 3.08 ford 8.8 rear sounds about what you probably have

This is a 96 but this is, presumably, the factory location of my tag and its got 4-5 letters, 8.8 or maybe 8 8, 3 08, and pretty much that.. 3.08 and 8.8 and (julian date?) being what I get from that. It would have an extra letter iirc to be limited slip, but I dont know about your year.

Also I would question your parking brake cables and brakes since a little dragging isnt unheard of. My truck had a kinked cable on one side and that came from not being in the retainers /guides and that applied the brake on one side. I cut them to get home but it was surprisingly driveable however wet grass on flat ground was enough to one wheel peel, so something to look at
 
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Old Mar 25, 2022 | 09:54 AM
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Originally Posted by AuroraGirl
If you have a rear axle tag you can tell if its limited (from factory) which is a clutch type If Im to be believed, which can wear out. But 3.08 ford 8.8 rear sounds about what you probably have

This is a 96 but this is, presumably, the factory location of my tag and its got 4-5 letters, 8.8 or maybe 8 8, 3 08, and pretty much that.. 3.08 and 8.8 and (julian date?) being what I get from that. It would have an extra letter iirc to be limited slip, but I dont know about your year.

Also I would question your parking brake cables and brakes since a little dragging isnt unheard of. My truck had a kinked cable on one side and that came from not being in the retainers /guides and that applied the brake on one side. I cut them to get home but it was surprisingly driveable however wet grass on flat ground was enough to one wheel peel, so something to look at
3 08 88 means an 8.8 with 3.08 gears open diff.
3L08 88 means an 8.8 with 3.08 limited slip. My tag has been long gone but I am fairly confident I have an open diff, baring any broken parts I am not aware of yet, 8.8 with 3.08 gears. Thanks for the help everyone.
 
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Old Mar 25, 2022 | 10:54 AM
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found my tag but you seem to have a grip on the meaning, plus you dont have a tag. Have you verified no brake issues?
 
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Old Mar 25, 2022 | 11:05 AM
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Originally Posted by AuroraGirl
Take a look at this Ford Axle Tag decoder
 
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Old Mar 25, 2022 | 01:13 PM
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Originally Posted by rla2005
Take a look at this Ford Axle Tag decoder
Oh perfect lol, I guess I wasnt in a hurry to find out what it was but appreciate knowledge where can get it lol.

Im still trying to decide what I want to do for rear axle. My leaf is shot, my diff is 3.08 open , my brakes are functional but the thing needs backing plates, realistically its all too much to sink money into since I also want to get out of 3.08 gears. Every day the Dana 60 rear from one of my wood trailers(Older F series) which I have yet to open the cover and see how its looking/decode the ratio and which also would probably need most brake components(plus perches etc...)

But on the other hand, I could also commit a crime /treason and 14 bolt full float.... seems overkill but I have one.

Then I have a ford 9 inch under another wood trailer. No idea on ratio but also an older f series (camper special f100 Im pretty sure.)

Choices.
TMI but thinking out loud
 
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Old Mar 25, 2022 | 01:47 PM
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Aurora, grab yourself a Dana out of a late 90s Econoline van. The 250s and 350s are running either d60 or d70, the 60 at least was commonly found with a limited slip. And you get disc brakes too 😇 Actually I'm pretty sure the disc thing happens with the E150s as well, but idk what actual axle those run.
 
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Old Mar 25, 2022 | 02:15 PM
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Originally Posted by Robfinger
Aurora, grab yourself a Dana out of a late 90s Econoline van. The 250s and 350s are running either d60 or d70, the 60 at least was commonly found with a limited slip. And you get disc brakes too 😇 Actually I'm pretty sure the disc thing happens with the E150s as well, but idk what actual axle those run.
How about a 2001 E150,... maybe E250? My dad has a conversion van from 2001, 5.4 and it runs like toast and its old and really not worth the work to fix it anyway..
I forget if its e250 or e150 but he did pull heavy trailers but Then again I learned how to use a machine past its worldy limits from him LOL

He pulled a very large jd skidsteer on a heavy heavy trailer with the hitch bumper ball on a 91 ranger. Bent that sucker back but he did pull it. Disc brakes would be nice. Im thinking about what to do with RABS too since my valve is crusty, and the fluid in the rear half of the lines are icky and the RABS is starting to have electrical issues, plus it doesnt work right anyway. The rust probably traveled up from wheel cylinder and caused issues. So I think when this all happens will see normal brakes to the back, because I know it can be fixed but there is a point where sometimes you just want your base model f150 to have so little to worry about lol. especially with the wiring condition after so much time.
 
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Old Mar 25, 2022 | 03:42 PM
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Originally Posted by AuroraGirl
How about a 2001 E150,... maybe E250?
Well young lady, I cannot possibly tell you what YOUR dad has 🤣

But that vehicle should serve your needs fine.

As for the RABS, you can get a manual valve off Summit for under 50 still hopefully, bypass the rabs and use the aftermarket thing to fine tune your rear brakes. Keep in mind that with rear discs you'll need a different master, what that Econoline your dad has runs should obviously be a thing to start with.
 
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Old Mar 25, 2022 | 04:00 PM
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Originally Posted by Robfinger
Well young lady, I cannot possibly tell you what YOUR dad has 🤣

But that vehicle should serve your needs fine.

As for the RABS, you can get a manual valve off Summit for under 50 still hopefully, bypass the rabs and use the aftermarket thing to fine tune your rear brakes. Keep in mind that with rear discs you'll need a different master, what that Econoline your dad has runs should obviously be a thing to start with.
Even without the residual pressure valve in the current one? Im not married to it so not outrageous just curious.
 
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Old Mar 25, 2022 | 07:14 PM
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Originally Posted by AuroraGirl
Even without the residual pressure valve in the current one? Im not married to it so not outrageous just curious.
Well I did say to use the Econoline master of doing rear discs, that takes care of the RPV in that situation.

If you're just getting rid of the RABS then you don't need with the master at all, you just run the rear line from it to the aftermarket adjuster and then down to the rear brakes. If I remember things right there ain't no RPV inside the RABS HCU, just isolation and dump valves. The RPV is the box hex thing sticking out the rear port of the master, and the line screws into that - ain't that right?
 
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Old Mar 26, 2022 | 06:25 AM
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Originally Posted by Robfinger
Aurora, grab yourself a Dana out of a late 90s Econoline van. The 250s and 350s are running either d60 or d70, the 60 at least was commonly found with a limited slip. And you get disc brakes too 😇 Actually I'm pretty sure the disc thing happens with the E150s as well, but idk what actual axle those run.
Since the thread has already taken a turn. That isn’t a direct “bolt in” swap.
 
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