Broken Axle

[MagicMtnDan]

I was reading the Sean Hyland Motorsports webpage on the GT500 motor and new tranny they put into the Raptor when I came across their mentioning they broke their left (rear) axle.

Left rear axle broke at the end of the splines on the last test day.

It was during this testing that we broke the left rear axle shaft, which frankly surprised us, as the HD rear axle in the Raptor has proven durable in other applications. We suspect the additional grip of the general tires, may have caused a flawed part to break, otherwise we will have to investigate some alloy axles for use of this truck.

They were running a LOT of power (600HP) and they went to Grabber tires

Now it's putting out a claimed 750HP thanks to the upgraded the supercharger to Kenne Bell unit, at 15psi on 93 octane!!!

The reason this is here in the Maintenance Forum is because I heard about a stock Raptor that broke a rear axle out in Ocotillo Wells (it wasn't just Sean Hyland that broke one) and I thought I'd post this here and see if the owner wants to comment about any similarities (or differences besides the huge HP gap).

Source: http://www.seanhylandmotorsport.com/raptor_offroad_testing.shtml

 

[SVTRay]

Hey Dan, was that other broken axle on a factory 5.4L Raptor?

 

[BigJ]

Hey Dan, was that other broken axle on a factory 5.4L Raptor?

Yep.

 

[frogslinger]

Yeah... one of the users on Z broke their axle four wheeling...

SVT did some research and I believe made a minor mods to later build trucks...

 

[MagicMtnDan]

Yeah... one of the users on Z broke their axle four wheeling...

Yup. We know whose Raptor it was. He's a member here (used to be a member on the RuinedForumz) and he'll probably show up here since I "called him out" :mrgreen:

SVT did some research and I believe made a minor mods to later build trucks...

How do you know this? Where did you hear it? (Thanks)

 

[frogslinger]

How do you know this? Where did you hear it? (Thanks)

I heard it on the Z, hence the modifier... not sure it is factual (the mod part... the research part was fairly widely commented upon).

 

[pirate air]

Theres been a 3rd reported axle shaft failure. Its over on raptorforumz, happened over the weekend I think. Raptorguy21. Pictures look similar to the SHM break.

 

[SVTRay]

Now is this the same rear end used in the earlier Ford trucks like my 03'?

 

[pirate air]

Now is this the same rear end used in the earlier Ford trucks like my 03'?

It's a 9.75, yours should be the same. The Raptor one is longer/wider, the tube is thicker, and the axle spline count is higher (can't remember 33 spline?). Generally these axles and assemblies are very stout and do great in just a regular F150 application. There must of been a bad batch made......

 

[KaiserM715]

It's a 9.75, yours should be the same. The Raptor one is longer/wider, the tube is thicker, and the axle spline count is higher (can't remember 33 spline?). Generally these axles and assemblies are very stout and do great in just a regular F150 application. There must of been a bad batch made......

I think these maybe 34 spline... Thought I read that somewhere.