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LSD: Eaton Detroit Truetrac 913A477 Technical only

50185 Views 115 Replies 50 Participants Last post by  kazuo
I would like this thread to stay focused on the installation of an Eaton Truetrac 913A477 differential. If you contribute, please do not speculate about the merits of LSD, or weather one should use a locker or other type differential. I would like this post only to list descriptions, P/Ns, supporting kits and results of forum members who have installed, or are about to install a Torsen type differential. (I read all the postings to date and they are all filled with conjectures, opinions and side-bar discussions, that make if difficult for anyone to quickly determine what they need to install LSD in their transit.)

Ford 9.75" Eaton Detroit TrueTrac | 34 Spline - 2017 street price - $539.99
- P/N 913A477
- Requires: 1.370" diameter 34 spline axles.
- Type LSD: Torsen
- Torque Bias Ratio: 3.5:1
- Cover = 12 bolt
- Pinion nut: 1-1/8

- Fits all OEM Transit gear ratios

This differential is installed the most in 2011-2017 Ford F150s with 9.75 rear ends.

Other rebuild kits that may be needed for installation, depending on mileage of van.
Crush sleeve and Master bearing kit
Example: Yukon Gear Bearing kit BK F9.75-D

To help stiffen up the pumpkin, F-150 forums recommend that you replace the steel cover with an aluminum girdle cover: Such as a Yukon YP C3-F9.75 - Street price around $200.
(This type of cover has bolts in the cover that secure to the bearing caps to add additional stiffiness.)

There is also an "Axle Crush Sleeve Eliminator Kit" available. (Anyone use one of these?)

Enjoy.
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Went to my local rear diff specialist today. Asked about having a TruTrac installed. They called the wholesaler who said they are backordered. Said to call again in a month. specialist shop said budget for $1,500 installed, including new bearings (if needed). I'll check back here after the installation.
 

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Went to my local rear diff specialist today. Asked about having a TruTrac installed. They called the wholesaler who said they are backordered. Said to call again in a month. specialist shop said budget for $1,500 installed, including new bearings (if needed). I'll check back here after the installation.
I just checked and the truetrac that fits our van is available from multiple online retailers including summit, stage 3 motor sports and even Amazon. When I had mine installed I bought it online and brought it to the off-road shop that I had install it. I think a lot of off-road shops prefer when you come with the parts in had, it saves them a lot of the hassle.
Also good luck with the install, you won’t regret, it makes a big improvement when off-road or even just in the snow.
 

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2018 MR 130 Passenger XLT 3.7. Mods: Eaton Truetrac, Yukon 4.11, Cooper Discoverer AT3 245/70/16
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I just checked and the truetrac that fits our van is available from multiple online retailers including summit, stage 3 motor sports and even Amazon. When I had mine installed I bought it online and brought it to the off-road shop that I had install it. I think a lot of off-road shops prefer when you come with the parts in had, it saves them a lot of the hassle.
Also good luck with the install, you won’t regret, it makes a big improvement when off-road or even just in the snow.
+1
That price is about right.
 

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Went to my local rear diff specialist today. Asked about having a TruTrac installed. They called the wholesaler who said they are backordered. Said to call again in a month. specialist shop said budget for $1,500 installed, including new bearings (if needed).
Have them leave the bearings on the factory carrier and keep it so it can be put back in if for some reason you wreck or sell your van and want to re-use the TruTrac in a new van. My open diff is sitting on the shelf in the box the PowerTrax Grip Pro came in (similar to the Eaton, but less $$$).

If you're anxious to get the install done don't wait for their wholesaler fill the backorder, buy one yourself as @dinocarsfast suggests.
 

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After the parts sitting in the garage for a year, I installed the truetrac on Labor Day. Took about 6 hours as others have said. 3 things added time to the install. First I had cleaned out my drawer that had a bunch of bearing races and things I used to press things with (former life as a mechanic) so when I went to smack on the new bearings I didn't have anything the right size. The boss for the bearings is taller than the bearings. So I removed one of the old carrier bearings and used that, add 20 minutes at least. Second, Torqueing the ring gear bolts was difficult using a 3 inch vice clamped to a 2x8 clamped to a table. I had to lean on the diff quite awkwardly to accomplish that. Third, jamming the diff back in was a chore, I did not use a case spreader. What really sucked is when I was still trying to figure out the best way to do that I put the shims in the same spot..... 50/50 chance I'd get it right. I was wrong. The shims were .005 inch different which translated to about .007 more backlash than what it started with. Pulled it out and did it again. I used all new hardware where suggested as I looked at too many pictures of Transits with the axle hanging out. I did install the axle spacer cap and c-clip, but not the spacer.
Can barely notice a slight difference on the pavement in sound/feel, but I'm hyper aware a change has been made. The test that made me happy was one wheel on dirt and one on pavement. Dirt wheel did not spin/throw rocks and the van took off as if it was totally on pavement. Looking forward to a slippery dirt road uphill near me and snow. This van sucked in the snow, I'm now optimistic.
 

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To help anyone going down the route of sourcing parts and handing them to the shop:

I ordered the TrueTrac from Jegs, which had an "instant rebate" of $67. Which came to $667.17 after tax.

And after talking with the shop, they recommended buying a "master install kit" and my best guess was to buy a "Yukon Gear & Axle (YK F9.75-D) Master Overhaul Kit" from amazon which came to $307.88 after tax.

($974 in parts so far)

The shop (J&S Gear out of Huntington Beach, found earlier in this post I believe) has quoted me $110/hr and 4 - 6 hours of labor, depending on how sad it is in there.

Update:

Labor was 5 hours and ended up at $588.79

Grand total: $1562
 

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2018 MR 130 Passenger XLT 3.7. Mods: Eaton Truetrac, Yukon 4.11, Cooper Discoverer AT3 245/70/16
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To help anyone going down the route of sourcing parts and handing them to the shop:

I ordered the TrueTrac from Jegs, which had an "instant rebate" of $67. Which came to $667.17 after tax.

And after talking with the shop, they recommended buying a "master install kit" and my best guess was to buy a "Yukon Gear & Axle (YK F9.75-D) Master Overhaul Kit" from amazon which came to $307.88 after tax.

($974 in parts so far)

The shop (J&S Gear out of Huntington Beach, found earlier in this post I believe) has quoted me $110/hr and 4 - 6 hours of labor, depending on how sad it is in there.
That’s very much in the ball park with what I paid. Couple of extras though, you’ll probably have to pay extra for the gear oil (non-synth and no friction modifier, like Lucas 85w140). An extra $30 I’m guessing for 4 quarts. Then, if these guys do what the shop I used did, they’ll want you to get the oil changed again after 500 miles, which was an additional 4 qts plus an hour. Worth it though, not getting stuck is awesome!
 

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Interestingly enough, a local shop sent a quote today and said they like to use the master install kit too. And the kit you listed is the one on the estimate. What's strange though is they don't want to replace the bolts and the kit (TK F9.75-D) doesn't list the Transit 350 as compatible, but it shows the 150 and 250, any ideas why that might be? I compared a parts list for the rear diff between a 250 and 350 and it's the same, so not sure why the discrepancy.

Our estimate was similar to @jayswain.
 

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...And after talking with the shop, they recommended buying a "master install kit" and my best guess was to buy a "Yukon Gear & Axle (YK F9.75-D) Master Overhaul Kit" from amazon which came to $307.88 after tax.
($974 in parts so far)
The shop (J&S Gear out of Huntington Beach, found earlier in this post I believe) has quoted me $110/hr and 4 - 6 hours of labor, depending on how sad it is in there...
fwiw when I installed a similar PowerTrax carrier I only used the bearings and a few shims from the Yukon kit that was about $100.

It was installed in less than 3 hours with a couple buddies, and that included most of an hour fooling with a differential cover that did not line up. If a "professional" shop needs 4-6 hours I smell something bad.
 

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The factory service manual says to replace the 12 ring gear bolts. Also to replace the 5 axle bolts each side, O-rings to be reused if OK. I will replace the O-rings, not very expensive. you would have to replace the bolts again if the o-rings leaked.
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Interestingly enough, a local shop sent a quote today and said they like to use the master install kit too. And the kit you listed is the one on the estimate. What's strange though is they don't want to replace the bolts and the kit (TK F9.75-D) doesn't list the Transit 350 as compatible, but it shows the 150 and 250, any ideas why that might be? I compared a parts list for the rear diff between a 250 and 350 and it's the same, so not sure why the discrepancy.

Our estimate was similar to @jayswain.
The 350HD with a dually axle would probably be different but SRW the axle should be the same. My guess is the catalog is wrong
 

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The factory service manual says to replace the 12 ring gear bolts. Also to replace the 5 axle bolts each side, O-rings to be reused if OK. I will replace the O-rings, not very expensive. you would have to replace the bolts again if the o-rings leaked.
Very happy to have found this thread. If I read correctly, it makes sense to do the rear brakes at the same time, since the axle bolts and O-rings are coming off anyway?

Looking for a reputable Bay Area shop to do this...
 

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Very happy to have found this thread. If I read correctly, it makes sense to do the rear brakes at the same time, since the axle bolts and O-rings are coming off anyway?
If they need to be done or are close to that, yes.

fwiw I am still quite pleased with the lower-priced PowerTrax carrier I installed.
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Very happy to have found this thread. If I read correctly, it makes sense to do the rear brakes at the same time, since the axle bolts and O-rings are coming off anyway?

Looking for a reputable Bay Area shop to do this...
Very happy to have found this thread. If I read correctly, it makes sense to do the rear brakes at the same time, since the axle bolts and O-rings are coming off anyway?

Looking for a reputable Bay Area shop to do this...
Hey RustBeltRefugee, I also just started to look for a shop to do this work in the Bay Area let me know if you find anything. So far the ones I have called disconnected numbers... :(
 
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