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2021 Ford F-150 Tremor 401A Vs Tremor 402A

400A, 401A, and 402A Window Stickers — I like having 4 Auto as an option, so 402A for me.

400A
C9555CA2-ACBC-47DC-BD07-D6915537F98E.jpeg


401A
45D23184-228A-404A-9008-9C6455280B16.jpeg


402A
A212CD0D-4301-45ED-8300-7F2EEBEABFAC.jpeg
 
I'm another fan of the 4 auto. I use it all the time in my Raptor when it rains. If not the back end is all over the place with the BFG KO2s.
 
I really like the 4A too. I use it in the heavy rain or when I expect heavy acceleration on wet pavement, like turning out into a busy highway. I was playing around with it on a steep hill climb in the mud to see how well it would do. My Raptor actually switched into 4H on it's own when it lost too much traction and went back to 4A when enough traction came back.

I'm surprised the lower end packages don't have it as it's part of the Raptor transfer case that I thought all Tremors got.
 
I believe the “4A” is due to the Raptor transfer case — packages 400A and 401A do not have the Raptor Transfer Case:

The rear axle is equipped with a locking differential (Ford says a Torsen front limited-slip differential will be available later), and its four-wheel-drive transfer case is borrowed from the F-150 Raptor.
Click to expand...
www.caranddriver.com

2021 Ford F-150 Tremor Has Raptor's Transfer Case, Costs $51,200

Tremors have an upgraded suspension and are powered by a 400-hp 3.5-liter EcoBoost V-6. They will arrive this summer.
www.caranddriver.com www.caranddriver.com

Here is some background on the development of the Raptor transfer case (MUST READ):

www.sae.org

Ford Raptor unique front driveline

Ford Raptor unique front driveline BorgWarner Torsen Mark Lecrone
www.sae.org
 
Last edited:
P0H0 said:
I believe the “4A” is due to the Raptor transfer case — packages 400A and 401A do not have the Raptor Transfer Case:


www.caranddriver.com

2021 Ford F-150 Tremor Has Raptor's Transfer Case, Costs $51,200

Tremors have an upgraded suspension and are powered by a 400-hp 3.5-liter EcoBoost V-6. They will arrive this summer.
www.caranddriver.com www.caranddriver.com

Here is some background on the development of the Raptor transfer case:

www.sae.org

Ford Raptor unique front driveline

Ford Raptor unique front driveline BorgWarner Torsen Mark Lecrone
www.sae.org
Click to expand...
I didn't realize that. I thought they all did. The Raptor transfer case also provides mechanically locking 4WD where the normal F150 transfer case uses clutch systems for 4WD.
 
RotorHead695 said:
I didn't realize that. I thought they all did. The Raptor transfer case also provides mechanically locking 4WD where the normal F150 transfer case uses clutch systems for 4WD.
Click to expand...

My logic is based on the 4A option — if the truck has the Raptor transfer case, you have 4A — I don’t believe packages 400A and 401A have 4A.

I could be wrong… maybe there is Raptor transfer case lite — no 4A. LOL.

Sport Mode goes straight to 4A for extra grip should you slip in the rear.

The article above describes the Raptor transfer case possessing TOD (torque on Demand) for those wet pavement scenarios where you need some forward grip — we know it as 4A.

Unique transfer case
The Raptor’s transfer case features both a TOD, clutch-based system to dynamically apportion power to the front axle for pavement-based scenarios, as well as a dog-clutch-type setup to mechanically connect the front and rear drivelines for low-traction, off-road duty. According to Pritish Khale of BorgWarner’s Program Engineering, the transfer case was developed for the Raptor after the OEM requested a “mechanical lock/torque-on-demand transfer case.” BorgWarner’s PowerDrive Systems Team worked with Ford over a three-year span (2014-16) for the transfer case’s launch on the 2017 Raptor.
According to Khale, the biggest challenge was packaging the two typically separate systems in a single case. “Due to the mechanical lock, it’s an ‘active’ transfer case that can also act as a ‘part-time’ transfer case,” he said. Beyond packaging, there was the goal of maximizing component commonality to keep the bill-of-material and manufacturing costs down. “Also,” Khale added, “it goes in a truck which is known for its off-roading abilities.”
To shift from the clutch-based TOD mode (“4Auto”) to a mechanically locked mode (“4Hi”; “4Lo”), a servo motor rotates a shift cam, which moves a mode fork that drives a locking collar rearward via a locking hub. “The locking collar engages with the upper drive sprocket and transfers torque to the lower-driven sprocket through a chain,” Khale explained. “The lower sprocket is splined to the front output shaft, and as a result the torque is split between front and rear shafts.”
Click to expand...
 
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P0H0 said:
My logic is based on the 4A option — if the truck has the Raptor transfer case, you have 4A — I don’t believe packages 400A and 401A have 4A mode.

I could be wrong… maybe there is Raptor transfer case lite — no 4A. LOL
Click to expand...
Haha...maybe they just removed the switch.
 
P0H0 said:
Read the SAE article I linked above — it dives deep into the the design of the Raptor transfer case. See you on the other side.

Here is its again for ease:

www.sae.org

Ford Raptor unique front driveline

Ford Raptor unique front driveline BorgWarner Torsen Mark Lecrone
www.sae.org
Click to expand...
Oh I've read that one before. And you are right, the "Hi-Lock" transfer case only gets added on the 402A. I just went through the build site again. I'm surprised by that. According to a forum I was reading months ago, it's only like $100 part difference. Some of the guys are putting them in their Lariats.
 
I am going to be adding the front Torsen LSD to my truck — unfortunately that $500 build upgrade will cost me a little bit more to add.
 
P0H0 said:
I am going to be adding the front Torsen LSD to my truck — unfortunately that $500 build upgrade will cost me a little bit more to add.
Click to expand...
It's definitely helped me out. Without the Torsen diff and deflating my tires, I'm not sure I would have made it out of a trail I got on by mistake last hunting trip. There was no backing out and no space to turn around. It was a road that turned into a SxS trail. My brother had to walk as my guide and had my mirrors folded in too. Muddy and boulders.
 
RotorHead695 said:
It's definitely helped me out. Without the Torsen diff and deflating my tires, I'm not sure I would have made it out of a trail I got on by mistake last hunting trip. There was no backing out and no space to turn around. It was a road that turned into a SxS trail. My brother had to walk as my guide and had my mirrors folded in too. Muddy and boulders.
Click to expand...
I am also day dreaming of some new turbos, intercooler, radiator, and tune for ~700HP — I should stop and wait… Raptor in 3-5 years. LOL
 
I believe for 2022, 400A, 401A and 402A have this option . I have been trying to figure out if 402A is worth the extra cost. Definitely want a Tremor. I planned on a Lightning in 2022, but looks like it may be a few years before we start to see those available.
Love the look and features of the Tremor, perfect model ! just Level it and done.
Only thing I noticed was Lead Foot and Velocity blue are no longer a color for 2022

Front-Axle w/Torsen® Differential 61T O O O
 
I must be blind, where does it state 4 auto on the window sticker? My window sticker is a bit different.
 
Jstonk said:
I must be blind, where does it state 4 auto on the window sticker? My window sticker is a bit different.
Click to expand...
As far as I know, you have to get the 402A in order to get 4Auto. I don't see in on my sticker either, but if you go back to the video, (time=7:10) you can see the 401A doesn't have 4A and (time= 9:58) the 402A does have 4A.
I hope this helps.
 
My 401A does not have 4 Auto, and I believe all 401A's are not equiped. My last pickup was '13 F150 Lariat with all the goodies, and my Tremor 401a is missing some things that even my '13 had that I miss. Mainly the HomeLink garage door opener buttons on the sun visor and the folding / retractable mirrors. 402A has these items, but not 401A. So now I have multiple garage door openers (neighborhood gate as well as 3 garage doors, and I had to move my wife to the single garage because without retracting mirrors I can't get in the garage. 1st world problems for sure. I'm probably going to miss the air conditioned seats in the Oklahoma heat this summer as well.
 
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