198 axle codes
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Tuned
Joined: Feb 2022
Posts: 295
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From: Central Montana
198 axle codes
i recently got a copy of the shop manuals for the 84 model year to match my truck. i was looking at the decoding section and realized my axle code isn't listed. my axle code is 16, which is both not on the list and doesn't make sense since it's 4x4 my understanding is that there should be another digit for the front axle. so my question is 2 fold. what gearing do i have and is my manual or the truck wrong?
FTE Legend
Joined: Nov 2015
Posts: 30,860
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From: Angier, NC
My tin foil hat tells me they never had a 84 4x4 F350 truck and why they dont list 2 numbers.
OH what you dont have a F350?
You telling me my hat lies to me well I'll be who would guess
A little more information goes a long way
What month & year is listed on the door sticker or better yet post a picture of it so we see what you are seeing.
If it was built after sept. it is the next year model in most cases. I got a 12/80 F100 making it a 81 model year truck.
So you may be looking at the wrong year for the decoding.
Dave ----
OH what you dont have a F350?
You telling me my hat lies to me well I'll be who would guess
A little more information goes a long way
What month & year is listed on the door sticker or better yet post a picture of it so we see what you are seeing.
If it was built after sept. it is the next year model in most cases. I got a 12/80 F100 making it a 81 model year truck.
So you may be looking at the wrong year for the decoding.
Dave ----
Trailering
Joined: Aug 2024
Posts: 17
Likes: 8
i recently got a copy of the shop manuals for the 84 model year to match my truck. i was looking at the decoding section and realized my axle code isn't listed. my axle code is 16, which is both not on the list and doesn't make sense since it's 4x4 my understanding is that there should be another digit for the front axle. so my question is 2 fold. what gearing do i have and is my manual or the truck wrong?
Do you have a 9” or an 8.8” (cast iron pumpkin in front of the axle housing or a 10 bolt cover in the rear of the axle housing)? I saw something suggesting a 9” 3.50 open or a 8.8 3.73 open on some forum, but I cannot confirm the reliability of this info.
Last edited by eboos; Aug 30, 2024 at 02:36 PM.
Thread Starter
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Tuned
Joined: Feb 2022
Posts: 295
Likes: 7
From: Central Montana
My tin foil hat tells me they never had a 84 4x4 F350 truck and why they dont list 2 numbers.
OH what you dont have a F350?
You telling me my hat lies to me well I'll be who would guess
A little more information goes a long way
What month & year is listed on the door sticker or better yet post a picture of it so we see what you are seeing.
If it was built after sept. it is the next year model in most cases. I got a 12/80 F100 making it a 81 model year truck.
So you may be looking at the wrong year for the decoding.
Dave ----
OH what you dont have a F350?
You telling me my hat lies to me well I'll be who would guess
A little more information goes a long way
What month & year is listed on the door sticker or better yet post a picture of it so we see what you are seeing.
If it was built after sept. it is the next year model in most cases. I got a 12/80 F100 making it a 81 model year truck.
So you may be looking at the wrong year for the decoding.
Dave ----
Thread Starter
|
Tuned
Joined: Feb 2022
Posts: 295
Likes: 7
From: Central Montana
My 4WD 86 F150 has an axle code of 19 (3.55 gears open diff). There is no code for the front since it must have the same gear ratio for the FWD to work properly. Sorry, I can’t identify code 16. Are you sure that is the correct code?
Do you have a 9” or an 8.8” (cast iron pumpkin in front of the axle housing or a 10 bolt cover in the rear of the axle housing)? I saw something suggesting a 9” 3.50 open or a 8.8 3.73 open on some forum, but I cannot confirm the reliability of this info.
Do you have a 9” or an 8.8” (cast iron pumpkin in front of the axle housing or a 10 bolt cover in the rear of the axle housing)? I saw something suggesting a 9” 3.50 open or a 8.8 3.73 open on some forum, but I cannot confirm the reliability of this info.
Trailering
Joined: Aug 2024
Posts: 17
Likes: 8
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Tuned
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From: Central Montana
Edit figured out the identification yes the transmission code is accurate
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Tuned
Joined: Feb 2022
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From: Central Montana
Here's a new photo taken today that old one is off a Marti report that i forgot i had so i guess this entire post was pointless, sorry everyone
FTE Legend
Joined: Nov 2015
Posts: 30,860
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From: Angier, NC
It's ok we all have brain farts some more than other 
So what dose the Marti report say it has for axles and ratios?
Yea someone could have changed them too but I dont think so like the motor.
Dave ----
So what dose the Marti report say it has for axles and ratios?
Yea someone could have changed them too but I dont think so like the motor.
Dave ----
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Tuned
Joined: Feb 2022
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From: Central Montana
Marti confirms 3.50 but doesn't say anything about weight
Thread Starter
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Tuned
Joined: Feb 2022
Posts: 295
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From: Central Montana
When i get around to pulling the diff I'll count
FTE Legend
Joined: Nov 2015
Posts: 30,860
Likes: 4,106
From: Angier, NC
A easier way is to get a wheel off the ground, both if LS, turn the wheel 1 turn and count the number of times the drive shaft turns.
if you have 3.50 gears the drive shaft should turn 3 1/2 turns to 1 of the wheel.
A little more that 3 could be 3.08 or 3.25, little more than 4 could be 4.10 / 4.11 gears.
Just get a close count and look up on charts for a ratio that is close is good enough just to know what you got.
Dave ----
if you have 3.50 gears the drive shaft should turn 3 1/2 turns to 1 of the wheel.
A little more that 3 could be 3.08 or 3.25, little more than 4 could be 4.10 / 4.11 gears.
Just get a close count and look up on charts for a ratio that is close is good enough just to know what you got.
Dave ----
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Joined: Jan 2001
Posts: 56,966
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From: Virginia
16 80/87 3.50 3.75M Ford Non-locking
3.75M means it's a 3750lb rated axle which is what your tag says also. That is a lighter duty axle which your tag also confirms. Your VIN indicates this is a light duty f250
3.75M means it's a 3750lb rated axle which is what your tag says also. That is a lighter duty axle which your tag also confirms. Your VIN indicates this is a light duty f250