one piece DS

[DougS550]

I have FP axle shafts (which are GT350 axle shafts) installed on my 2015.
Be aware, Ford upgraded the axle shafts on the 2018+ Gen3 cars to GT350 axle shafts on production models.
I’m almost 100% positive if your S550 is a 2018+ it comes standard equipped with the OEM upgraded shafts.
Hopefully another member can chime in and verify this to 100% certainty.

2019 GT PP1: I did not know that but I will ask my service rep to look them up and see. Thanks

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[DougS550]

Being the S550 is an IRS design the lowering of vehicle ride height does not affect pinion angles.
If you decide on .250” cross member shimming Make sure to use a bit longer bolts. The factory bolts have a long tapered lead thread, not a standard square lead starter thread like typical fasteners.

I always look at the thread length of a bolt when ever I might add shims, spacers etc. Thank you for your help.

 

[shadowx]

2019 GT PP1: I did not know that but I will ask my service rep to look them up and see. Thanks

Any news?

 

[DougS550]

Any news?

Sorry totally forgot. I will now send a message to my Ford rep parts person and ask.

 

[DougS550]

Any news?

This is what My Local Ford Rep sent me. My car which is a 2019 GT has newer upgraded axles. What exactly does that indicate? They are not GT350 axle part numbers.

"According to the build list on your car, It has the newer part numbers in it.,

Left side Is a KR3Z-4K139-C (Used from 3/26/2023 – 04/05/2023)

Right side is a KR3Z-4K138-B (Used from 10/01/2023 – 04/05/2023)

The 2019 GT350 (5.2) used the following,

Right side- FR3Z-4K138-F (used from 07/13/2015 – 07/23/2018)

Left side – FR3Z-4K139-H (used from 07/13/2015 – 07/23/2018)

The 2019 5.0’s used the following,

Right side – FR3Z-4K138-E (used from 12/04/2017 – 01/04/2021)

Left side – FR3Z-4K139-F (used from 12/04/2017 – 01/04/2021)

The 2018 5.2’s Used the following,

Right side- FR3Z-4K138-F (used from 07/13/2015 – 07/13/2018)

Left side – FR3Z-4K139-H (used from 07/13/2015 – 04/05/2023)

The 2018 5.0’s used the following,

Right side – FR3Z-4K139-F (used from 12/04/2017 – 01/04/2021)

Left side – FR3Z-4K138-E (used from 10/02/2017-01/04/2021)

The 2017 5.0’s used the following,

Right side – FR3Z-4K138-E (used from 08/18/2014 – 10/02/2017)

Left side – FR3Z-4K139-F (used from 08/18/2014 – 11/03/2016)

The 2017 5.2’s used the following,

Right side -FR3Z-4K138-F (used from 07/13/2015 – 07/23/2018)

Left side – FR3Z-4K139-H (used from 07/13/2015 – 07/23/2018)

 

[m3incorp]

OP, what other mods are you planning to do?

 

[DougS550]

OP, what other mods are you planning to do?

I think I will start with 93 and Boostane and then later add E85. But this is what I am in the process of doing.
ESS G3X with G4 IC and 10 rib pulleys, MMR Pro Billet Timing chain, Sprockets, with ratchet tensioner, MMR CS, QA1 CF DS, Outlaw half shafts, Arcane Fuel rails, ID1050 injectors, Juggernaute Drop in Fuel Hat/Pumps, Boost gauge, LTH Long Tube Headers with high flow cats. My suspension I completed last year. I'm sure I'm missing something, but that's most of my mods.

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