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I just find it funny that 3 Ford dealers cannot answer this simple question(s). Let alone the local drive train specialist. See what Ford head office tells me. That will reveal how trustworthy they are.
I find it funny that it took less than 10 post for someone to turn this thread into precisely what the original poster asked it not become. :|
 

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Man, I am so glad I found this forum! One of the main things I wished my van came with was the LSD, and now I found that I can get one even better than the factory, albeit at a premium. Is this something I can do in stages, for budget reasons? I want to start with a simpler 3.31 to 3.73 swap, keeping the stock non-LSD for now. Then I can do the LSD later. Or do the parts not interchange? In that case, I might be better off just waiting until I can do it all at once, and not waste parts.
 

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Man, I am so glad I found this forum! One of the main things I wished my van came with was the LSD, and now I found that I can get one even better than the factory, albeit at a premium. Is this something I can do in stages, for budget reasons? I want to start with a simpler 3.31 to 3.73 swap, keeping the stock non-LSD for now. Then I can do the LSD later. Or do the parts not interchange? In that case, I might be better off just waiting until I can do it all at once, and not waste parts.
You can do it in two stages, but you will be paying for labor twice since its almost the same amount of work for each individual think you want.

its a little more labor for the gear install, since they have to pull/switch out the pinion gear and potentially shims/bearing/seal.

If you could do it all at once you will share most of the labor cost.
 

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I have a T-350 wagon, OEM LSD, Ecoboost, 3.31 gearing. Looking to get 3.73 gears for towing and to help compensate for larger tires. Any idea if I can swap my OEM LSD for Truetrac?
 

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I have a T-350 wagon, OEM LSD, Ecoboost, 3.31 gearing. Looking to get 3.73 gears for towing and to help compensate for larger tires. Any idea if I can swap my OEM LSD for Truetrac?
Yes the truetrac works in all of our differentials. Have them do it the same time you are getting the new gears.
 

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Can anybody recommend a shop for installing an Eaton lsd in socal?
Look for driveline/drivetrain/rear end/axle specialty shops in your area.

You can also find a 4x4 jeep/off road type shop or a racecar/performance shop and ask them who they recommend for driveline/gear/differential work.

You absolutely don't want this done at a dealership or 90%+ of general automotive repair shops.

this will get you started down the path of finding a good install shop:

https://www.google.com/maps/search/rear+end+driveline+axle/@33.0251524,-116.8814057,9.75z/data=!4m2!2m1!6e6
 

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LSD swap - Ford dealership can't help with parts

Had a Eaton Detroit Truetrac torsen type differential installed in my 2017 T-350 wagon. Was an open differential and will need the traction for the snow in Michigan.

Took it to a rear end specialty shop that was highly recommended and does many of these (Warren axle and gear in Warren, Michigan)

Cost:$930 total

paid $597 for the unit
$255 labor (3 hours @ $85/hr)
$40 for gear lube and shop supplies

Used normal non synthetic without friction modifier gear lube, as eaton recommends

Shop supplied everything including the truetrac unit

absolutely no driveability or noise difference from the stock open differential but i have only had it a few days
Hi kc8flb,
I'm going through what others have gone through where no techs around here know how to do the work. I have one saying he can do it for 3 hours as a starter if I bring in the part. So here's where I get stuck. Ford dealership/Parts cannot help. I have a sticker on my side door that says my axle is "31" (guessing 31 splines?) and my VIN says my axle ratio is 3.73. My wheelbase is 148" and I have the 3.5L EcoBoost. Eaton needs the axle LENGTH. How do i find this??? If Ford parts guys can't help while looking at their diagrams then how can i solve this mystery? Ugh :|
3stageMotorSports is telling me that since its basically a F150 I have two options for the Eaton Truetrac:
8.8” rear, 31 spline
913A561
9.75" rear, 34 spline
913A477
I'm guessing I need the 913A561 because of my "31" axle? But definitely not sure.
Anyone have a clue? lol
Thanks for your time brother,
Benny
 

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If your sticker on the door says your axle code is 31 you have a 3.31 final with no limited slip. 3L would be 3.31 limited. If your code is 73 you have a 3.73 no limited and 7L would be 3.73 limited.

Your axle is a 9.75.
 

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LSD swap - Ford dealership can't help with parts

Wait, wha?~* :|
So does Ford pop out a sheet on that stuff that I can show my dealership?
Because check out this pic of the door sticker! (in my forum garage pics)
The dealership I just bought it from is telling me the axle is a 3.73 ratio! I suppose a 3.31 would be better on gas so its probably a good thing right?
So am I understanding you right that my RATIO is 3.31 NOT 3.73?
Looks like I'll be ordering the 913A477! Woohooo!
.
One last question for all the Transit peeps out there that have done this:
Do I need to order new bearings and shims for this swap out?
.
Thanks for your time with helping me on this brother!!!
 

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Wait, wha?~* :|
So does Ford pop out a sheet on that stuff that I can show my dealership?
Because check out this pic of the door sticker! (in my garage)
The dealership I just bought if from is telling me the axle is a 3.73 ratio! I suppose a 3.31 would be better on gas so its probably a good thing right?
So am I understanding you right that my RATIO is 3.31 NOT 3.73?
Looks like I'll be ordering the 913A477!
Yes you're ratio is 3.31.

It's published in the Trailer Tow Selector document from Ford.
 

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Hey guys,
I have a 2017 Ford Transit 350 XLT, 148” wheel base, 3.5L eco, 3.31 axle ratio. I’m wanting to swap out the slip differential with the Eaton Truetrac 913A477. Has anyone made this swap? Do I need to buy bearings and shims? Or are no additional parts needed?
(I’ve found a pro tranny tech here that is willing to take this on. He said I can bring in the parts and he’ll install. Ford dealership couldn’t even tell me axle info even when looking at their diagrams!)
 

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Had a Eaton Detroit Truetrac torsen type differential installed in my 2017 T-350 wagon. Was an open differential and will need the traction for the snow in Michigan.

Took it to a rear end specialty shop that was highly recommended and does many of these (Warren axle and gear in Warren, Michigan)

Cost:$930 total

paid $597 for the unit
$255 labor (3 hours @ $85/hr)
$40 for gear lube and shop supplies

Used normal non synthetic without friction modifier gear lube, as eaton recommends

Shop supplied everything including the truetrac unit

absolutely no driveability or noise difference from the stock open differential but i have only had it a few days
Hey kc8flb
Did your shop have to use a shim kit? And is finding the kit online simple?
Thanks brother
 

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Hey kc8flb
Did your shop have to use a shim kit? And is finding the kit online simple?
Thanks brother
Hi Benny,

My shop had everything already. They were a big shop that does rear ends all day/every day, so they already had everything in stock. I would probably ask them and it might make sense to order bearings and shim kit and if they don't use them, return them.

I don't think you really know if you need bearings or shims until you get into the job. If your van has a decent amount of miles, It might be worth replacing the bearings while they are in there. My van had 13k miles when mine were done and I told the rear end shop i had no problem paying to replace bearings if they thought better bearings would be better becasue I plan to keep the van long term. they said the bearings looked great and to leave them alone.

I see you are from the "Tri cities area in WA" looking up in google maps, here is a place that I would contact that is close to you:

http://madmechanicsllc.com/custom-off-road-truck/3252522
 

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Thanks KC! Our van only has 19k miles on it so it sounds like we could keep the bearings that are in there. I was concerned about them fitting on the Truetrac but it sounds like the Truetrac will work with the stock bearings? And shims....no one so far can tell me if they’re even needed with this swap. If they MIGHT be needed, what kit would I need to go with? Is the shim kit ordered based on an axle size or the Truetrac part or what? Where do these specialty shops first learn these things?
Thanks for your time!! ?
 

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Thanks KC! Our van only has 19k miles on it so it sounds like we could keep the bearings that are in there. I was concerned about them fitting on the Truetrac but it sounds like the Truetrac will work with the stock bearings? And shims....no one so far can tell me if they’re even needed with this swap. If they MIGHT be needed, what kit would I need to go with? Is the shim kit ordered based on an axle size or the Truetrac part or what? Where do these specialty shops first learn these things?
Thanks for your time!! ?

Take a look at this diagram:
http://www.differentials.com/wp-content/uploads/2018/04/Differential-and-Axle-Exploded-View-Diagrams.pdf


in the top diagram upper right hand corner you can see these parts: Race, Carrier Bearing, Shims, differential, shims, carrier bearing, race (ignore the ring gear and ring gear bolts)

the differential is the Eaton true trac or your stock unit. They will pull your stock differential out and replace with the true trac differential. the shims on each side space the differential to the bearing and more importantly make sure that your ring gear (which is bolted to the differential) is located side-to-side in the exact spot to mesh correctly with the pinion gear.

when the installer puts the new differential in, they have to check/measure precisely that alignment of the gears and if its not acceptable, they may have to add/remove/change some of those shims(very thin spacers) to achieve and acceptable spacing/mesh of the ring gear/differential side-to-side in order to mesh with the pinion gear correctly.

Those bearings next to the shims are the bearings they would replace if they need to replace them for some reason.

Call your shop and ask if you need the shim/bearing kits. Also I would call the off road shop as well, they may have more experience in installing differentials than the transmission shop as its a very popular mod in the off road world and its the same skill as installing in your van or in a off road truck. The off road shop will mostly already be familiar with the truetrac unit as well and has already probably installed some.

You are really looking for the person that has the most experience installing differentials in your area.
 

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SOLVED! Wooohooo!!!

Eaton passed me to Spencer Fluid Power which passed me to West Coast Differential. Talked to Rusty (Eight00-510-0nine50) who definitely knew what he was talking about with the Ford Transit! Yes! So great to talk to someone who knows their stuff with the Transit differential!
Ok, here's the scoop:
(for the Transit 350, 9.75" axle, 3.31 ratio to swap to the limited slip Eaton TrueTrac 913A477)
Rusty said its an easy swap.
He confirmed the 913A477 is the way to go.
He said you should have spare bearings, race, and shim kit ready just in case anything is damaged during the swap (even if you have low miles).
When you pop in the Truetrac use the factory shims as your base.
You MIGHT have to use a few shims from the kit.
The shims are easy to install - they're installed outboard of the races.
Shim kit part number: SS9.75F
(I went with the Yukon SK SSF9.75 because it was on Amazon ($50))
Backup bearing kit: (standard 9.75 Ford axle) Timken NP343847 ($34)
Race kit: (standard 9.75 Ford axle) Timken NP372019 ($16)
Mobil 1 Synthetic Gear Lube LS 75W-90, 2.6L needed
.
I'll let you guys know how the install goes once I have it done! Thanks again everyone for your input! It will be good to know that we won't be getting stuck in the snow as easily with this Truetrac in our ride! ;)
 

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Thanks KC

Take a look at this diagram:
http://www.differentials.com/wp-content/uploads/2018/04/Differential-and-Axle-Exploded-View-Diagrams.pdf


in the top diagram upper right hand corner you can see these parts: Race, Carrier Bearing, Shims, differential, shims, carrier bearing, race (ignore the ring gear and ring gear bolts)

the differential is the Eaton true trac or your stock unit. They will pull your stock differential out and replace with the true trac differential. the shims on each side space the differential to the bearing and more importantly make sure that your ring gear (which is bolted to the differential) is located side-to-side in the exact spot to mesh correctly with the pinion gear.

when the installer puts the new differential in, they have to check/measure precisely that alignment of the gears and if its not acceptable, they may have to add/remove/change some of those shims(very thin spacers) to achieve and acceptable spacing/mesh of the ring gear/differential side-to-side in order to mesh with the pinion gear correctly.

Those bearings next to the shims are the bearings they would replace if they need to replace them for some reason.

Call your shop and ask if you need the shim/bearing kits. Also I would call the off road shop as well, they may have more experience in installing differentials than the transmission shop as its a very popular mod in the off road world and its the same skill as installing in your van or in a off road truck. The off road shop will mostly already be familiar with the truetrac unit as well and has already probably installed some.

You are really looking for the person that has the most experience installing differentials in your area.
Thanks KC! This was an amazing write-up! Great job! This will help many newbies in the years to come! I've listed part numbers and a little more detail to my post above to add to this. I feel totally confident now with working with someone to get this done. And you're right, I need to find someone who does this all the time. I'll give those guys a call! Thanks again brother!!
 
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