More 9.75" diff talk

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Oct 25, 2018 | 06:59 AM

#121

DeltaNu1142

Flaccid Member

Joined: Sep 2016

Posts: 2,168

Likes: 588

From: Maine

Quote:

Originally Posted by mikeinatlanta

With a 5.0 motor you get a 9.75 with 3.73, and 3.73 is the only way to get a 9.75 with a 5.0 motor.

I can't speak to the availability of any of those configurations rolling off an assembly line... but I find myself suddenly curious about a 4.10 swap (only there doesn't seem to be a matching OEM front ring & pinion set; maybe it's a factory RWD config only)...

I also went into a whole bunch of detail on rear axles in this HDPP thread. The moral of the story is that the 9.75HD axle rating is 4,800 lbs.; the standard 9.75 axle rating is 4,500 lbs.; and in both configurations, the axle rating is the upper limit to rear GAWR.

Last edited by DeltaNu1142; Oct 25, 2018 at 08:44 AM.

Oct 25, 2018 | 08:16 AM

#122

Cuch

Senior Member

Joined: Aug 2017

Posts: 212

Likes: 83

Quote:

Originally Posted by 2015rubyFX4

you don't need the 9.75 rear. I know a guy with an 8.8 rear that runs the quarter mile in low 10's at 125 mph and its stays together fine

Dorian J. at Atco?

Oct 25, 2018 | 01:53 PM

#123

rallyon

Junior Member

Joined: Oct 2013

Posts: 11

Likes: 0

What are people using to get past the 106 speed limiter? I can't find one that will really work with a Roush supercharger. I just want to get down the 1/4 mile without getting locked out for speed.

Oct 25, 2018 | 02:04 PM

#124

Madcap57

5 Year Member

Joined: Oct 2016

Posts: 577

Likes: 121

From: Northern Illinois

Quote:

Originally Posted by DeltaNu1142

I have a 2016 5.0L Platinum with a 9.75", 3.55 ratio e-locker rear end. It has the 7,000 lb GVWR package. I was curious about what Tasca offered for my truck, and these are the configurations I found:

I can't speak to the availability of any of those configurations rolling off an assembly line... but I find myself suddenly curious about a 4.10 swap (only there doesn't seem to be a matching OEM front ring & pinion set; maybe it's a factory RWD config only)...

I also went into a whole bunch of detail on rear axles in this HDPP thread. The moral of the story is that the 9.75HD axle rating is 4,800 lbs.; the standard 9.75 axle rating is 4,500 lbs.; and in both configurations, the axle rating is the upper limit to rear GAWR.

I highly suspect the only factory 4.10 is in the Raptor so you should be able to find the the front ring and pinion, I just don't know if they will fit a non-raptor.

Oct 25, 2018 | 02:44 PM

#125

montanaman

FORD lifer

Joined: Jul 2011

Posts: 1,239

Likes: 255

From: The Quad Cities - relocated from Montana

Quote:

Originally Posted by rallyon

What are people using to get past the 106 speed limiter? I can't find one that will really work with a Roush supercharger. I just want to get down the 1/4 mile without getting locked out for speed.

With a tuner a eco or 5.0 will go North of 130mph anytime.

My '11 was speed limited to 96.

Mar 8, 2020 | 01:06 AM

#126

Thecowtamer

Junior Member

Joined: Mar 2020

Posts: 1

Likes: 0

2013 5.0 3.55 9.75

Recently purchased a 2013 fx4 super crew 5.5ft, it has a 5.0 in it, 3.55 gears and a 9.75 which I have confirmed with the door sticker and counting drift shaft rotations. This truck seems to be kind of a unicorn as well.

Mar 8, 2020 | 12:08 PM

#127

PaulWil

5 Year Member

Joined: Oct 2017

Posts: 304

Likes: 77

From: Durango Co

I wonder who is confused? Me or the rest of you?
My truck came with 3.73 axle ratio and the rear axle housing CODE is 9.75
One thing for sure is I have a 3.73 ratio in both diffs.

Mar 8, 2020 | 12:13 PM

#128

BareBonesXL

Senior Member

Joined: Nov 2017

Posts: 6,637

Likes: 1,292

From: Washington

Quote:

Originally Posted by PaulWil

I wonder who is confused? Me or the rest of you?
My truck came with 3.73 axle ratio and the rear axle housing CODE is 9.75
One thing for sure is I have a 3.73 ratio in both diffs.

If you use the "Quote" button people will know who you are responding to. There are 7 pages in this thread.