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3-4 Shell Recruiting Guide (CFB 27): Who to Recruit and Why

201 plays charted18 positions on the board

3-4 Shell is a two-high match defense. It leans odd, tite-spaced fronts at 51% of snaps.

The snap counts put two interior linemen, two edges, two sub linebackers, and five defensive backs on the field at starter share. Sub packages are the base defense here.

The strip below shows every formation the book calls, grouped the way the play-call screen groups them. Tap any bubble for the recruiting answer at that spot, then use the board for the full read.

The formations, grouped like the play-call screen

BallknowerHQ — ballknowerhq.com — nickel-3-3-over-jackLOSNickel 3-3 Over Jack4 DL / 2 LB / 5 DBFS1SS1CB1CB2CB3SUBLB1SUBLB2RRE1NT1DT1RLE1ballknowerhq.com
Nickel 3-3 Over Jack24 plays · 11.8%
BallknowerHQ — ballknowerhq.com — nickel-3-3-mintLOSNickel 3-3 Mint4 DL / 2 LB / 5 DBFS1SS1CB1CB2CB3SUBLB1SUBLB2DT1NT1DT2RLE1ballknowerhq.com
Nickel 3-3 Mint21 plays · 10.3%
BallknowerHQ — ballknowerhq.com — nickel-3-3-wide-jackLOSNickel 3-3 Wide Jack4 DL / 2 LB / 5 DBFS1SS1CB1CB2CB3SUBLB1SUBLB2RRE1NT1DT1RLE1ballknowerhq.com
Nickel 3-3 Wide Jack21 plays · 10.3%
BallknowerHQ — ballknowerhq.com — nickel-2-4-single-mugLOSNickel 2-4 Single Mug4 DL / 2 LB / 5 DBFS1SS1CB1CB2CB3SUBLB2RRE1NT1SUBLB1DT1RLE1ballknowerhq.com
Nickel 2-4 Single Mug15 plays · 7.3%
BallknowerHQ — ballknowerhq.com — nickel-2-4-load-dbl-mugLOSNickel 2-4 Load Dbl Mug4 DL / 2 LB / 5 DBFS1SS1CB1CB2CB3RRE1NT1DT1SUBLB1SUBLB2RLE1ballknowerhq.com
Nickel 2-4 Load Dbl Mug12 plays · 5.9%

Tap a bubble for the recruiting answer at that spot. Snap shares under each formation are that call's slice of the book.

The sign plan

Counts cover positions at 5% of the book's snaps or more. Bodies per snap decides how many each group needs. Each card jumps to its group on the board.

The board, by position group

Edges Sign 4: 2 starter, 2 rotation Speed Rusher, Power Rusher 4 spots
RLE1Edge 61.8%Starter Speed Rusher AccelerationFinesse MovesPower MovesBlock Shedding

69% of snaps ask for the even_4down RRE_RLE job, 31% ask for the odd_tite RRE_RLE job. Designated pass rushers in the sub-package fronts. The pair aligns outside in Nickel and Dime spacing and wins with get-off, because a four-man rush has to create pressure while everyone else covers. Contain duty against scrambling quarterbacks comes with the job. Rushes from width in the three-down sub fronts. Dime 3-2 and Nickel 3-3 Mint supply most of these snaps, so he attacks long edges with only one or two interior bodies beside him and has to win without much help. Twist games off his rush are part of the deal.

Physical 6'2 to 6'5, 245 to 270. Get-off outranks everything else.

In even, four-down fronts (69% of this spot's snaps)

Archetype Speed Rusher

Physical 6'2 to 6'5, 245 to 270. Get-off outranks everything else.

Attributes to scout AccelerationFinesse MovesPower MovesBlock Shedding

In odd, tite-spaced fronts (31% of this spot's snaps)

Archetype Speed Rusher

Physical 6'2 to 6'5, 245 to 270. Get-off outranks everything else.

Attributes to scout AccelerationFinesse MovesPower Moves

RRE1Edge 51.5%Starter Speed Rusher AccelerationFinesse MovesPower MovesBlock Shedding

Designated pass rushers in the sub-package fronts. The pair aligns outside in Nickel and Dime spacing and wins with get-off, because a four-man rush has to create pressure while everyone else covers. Contain duty against scrambling quarterbacks comes with the job.

Physical 6'2 to 6'5, 245 to 270. Get-off outranks everything else.

REDGE1Edge 36.8%Rotation Power Rusheralt: Pure Power Block SheddingStrengthPower MovesFinesse Moves

Sets the edge outside the tite front. With the interior trio eating blocks, he squeezes runs back inside and keeps contain against zone schemes, and his rush wins come off power and length more than pure burst. He carries more run responsibility than an even-front edge.

Physical 6'3 to 6'6, 250 to 280. Length outranks timed speed.

LEDGE1Edge 33.8%Rotation Power Rusheralt: Pure Power Block SheddingStrengthPower MovesFinesse Moves

Sets the edge outside the tite front. With the interior trio eating blocks, he squeezes runs back inside and keeps contain against zone schemes, and his rush wins come off power and length more than pure burst. He carries more run responsibility than an even-front edge.

Physical 6'3 to 6'6, 250 to 280. Length outranks timed speed.

Corners Sign 4: 3 starter, 1 package Zone 4 spots
CB1Corner 95.6%Starter Zonealt: Field Corner Zone CoverageMan Coverage

Matches #1 from a zone start. He plays with zone eyes until the route distribution declares, then locks the vertical like man. Route recognition beats raw speed at this spot, which widens the recruiting pool. He midpoints #1 and #2 until the picture resolves, and the extra grass punishes slow processing more than slow legs.

Physical 5'11 to 6'2, 185 to 200. Recognition outranks timed speed.

CB1/CB2 are the outside pair; boundary vs field is alignment, the depth chart does not split them

CB2Corner 92.7%Starter Zonealt: Field Corner Zone CoverageMan Coverage

Matches #1 from a zone start. He plays with zone eyes until the route distribution declares, then locks the vertical like man. Route recognition beats raw speed at this spot, which widens the recruiting pool. He midpoints #1 and #2 until the picture resolves, and the extra grass punishes slow processing more than slow legs.

Physical 5'11 to 6'2, 185 to 200. Recognition outranks timed speed.

CB1/CB2 are the outside pair; boundary vs field is alignment, the depth chart does not split them

CB3Corner 61.8%Starter Zone Zone CoverageAwareness

Handles #2 in the match count. Seams and out-breakers from the slot are his to carry or pass off, and the pass-off decision is the skill. He funnels vertical stems to safety help and squeezes everything else.

Physical 5'9 to 6'0, 185 to 200. Processing outranks length.

first slot body; CB_slot rows cover CB3 and CB4

CB4Corner 16.2%Package Zone Zone CoverageAwareness

Handles #2 in the match count. Seams and out-breakers from the slot are his to carry or pass off, and the pass-off decision is the skill. He funnels vertical stems to safety help and squeezes everything else.

Physical 5'9 to 6'0, 185 to 200. Processing outranks length.

second slot body, on the field in dime sets

Interior DL Sign 4: 2 starter, 1 rotation, 1 package Pure Power, Gap Specialist 4 spots
DT1Interior DL 98.5%Starter Pure Poweralt: Power Rusher Block SheddingStrengthPower MovesFinesse Moves

51% of snaps ask for the odd_tite DT job, 43% ask for the even_4down DT job. Plays the long end spots of the odd fronts, from a 4i on the tackle's inside shoulder in tite spacing to a head-up or outside 5-technique in base 3-4 looks. He two-gaps with length and keeps the B-gap closed so runs spill to the edge players. Rush production comes from push and hands rather than speed. Penetrates as the 3-technique. He lines up on the guard's outside shoulder and wins the B-gap with his first step, turning run downs into losses behind the line. On passing downs he supplies the interior rush that keeps quarterbacks off their spot. 21% of his snaps come from mugged formations. Protections point extra attention at the mugged threats, which leaves the nose and tackle in more one-on-one blocks they are expected to win.

Physical 6'3 to 6'6, 285 to 315. Arm length outranks burst.

In odd, tite-spaced fronts (51% of this spot's snaps)

Archetype Pure Power (alt: Power Rusher)

Physical 6'3 to 6'6, 285 to 315. Arm length outranks burst.

Attributes to scout Block SheddingStrengthPower MovesFinesse Moves

In even, four-down fronts (43% of this spot's snaps)

Archetype Speed Rusher (alt: Power Rusher)

Physical 6'2 to 6'5, 285 to 310. First-step quickness outranks bulk.

Attributes to scout Finesse MovesPower MovesAccelerationBlock Shedding

NT1Interior DL 89.7%Starter Gap Specialistalt: Pure Power Block SheddingStrength

48% of snaps ask for the even_4down NT job, 46% ask for the odd_tite NT job. Anchors the front as the shade nose. He controls the A-gap against interior runs and holds his ground against double teams so the MIKE can flow. Pocket push on late downs is a bonus on top of the run-down anchor. Two-gaps the center in tite spacing. He absorbs double teams without giving ground and closes both A-gaps so the linebackers can run. There is no help coming, so mass and leverage are the job. 23% of his snaps come from mugged formations. Protections point extra attention at the mugged threats, which leaves the nose and tackle in more one-on-one blocks they are expected to win.

Physical 6'1 to 6'4, 300 to 330. Anchor strength outranks height.

In even, four-down fronts (48% of this spot's snaps)

Archetype Gap Specialist (alt: Pure Power)

Physical 6'1 to 6'4, 300 to 330. Anchor strength outranks height.

Attributes to scout Block SheddingStrength

In odd, tite-spaced fronts (46% of this spot's snaps)

Archetype Pure Power

Physical 6'1 to 6'4, 320 to 350. Anchor against doubles outranks every measurable.

Attributes to scout StrengthBlock Shedding

DT2Interior DL 47.1%Rotation Pure Poweralt: Power Rusher Block SheddingStrengthPower MovesFinesse Moves

Plays the long end spots of the odd fronts, from a 4i on the tackle's inside shoulder in tite spacing to a head-up or outside 5-technique in base 3-4 looks. He two-gaps with length and keeps the B-gap closed so runs spill to the edge players. Rush production comes from push and hands rather than speed.

Physical 6'3 to 6'6, 285 to 315. Arm length outranks burst.

DT3Interior DL 5.9%Package Gap Specialist Block SheddingStrength

Covers the guards in bear looks and multiplies in goal line fronts, where DT3 and RDT tokens add extra interior bodies. Every rep is a single block in a phone booth, so he has to win fast with power because there is no space to recover.

Physical 6'2 to 6'5, 300 to 330. Short-area power outranks any testing number.

Safeties Sign 2: 2 starter Coverage Specialist 2 spots
FS1Safety 98.5%Starter Coverage Specialist Zone CoverageAwarenessTackle

Reads #2 from depth on his half. Match rules make him a two-way player: vertical by #2 is his to carry, anything under it frees him to rob or fit. Once his key blocks, he arrives in the run fit like an extra backer.

Physical 6'0 to 6'2, 195 to 210. Read speed outranks range.

SS1Safety 98.5%Starter Coverage Specialistalt: Hybrid Zone CoverageAwarenessTackle

Mirrors the FS job to his side. Match shells make the safeties interchangeable readers, so both need the same eyes and the same trigger. Whichever one offenses find slower becomes the target, which sets the floor for both spots.

Physical 6'0 to 6'2, 195 to 210. Read speed outranks range.

Sub LBs Sign 2: 2 starter Lurker 2 spots
SUBLB1Sub LB 61.8%Starter Lurker Man CoverageZone CoverageAccelerationHit Power

69% of snaps ask for the even_4down SUBLB job, 31% ask for the odd_tite SUBLB job. Holds the second level of the sub packages that carry most snaps. The job is coverage first, matching backs and tight ends underneath, with a late rush added when the assignment stays in to block. Sub fronts field both SUBLB tokens together, so this is a sign-two position. Covers from the middle of light boxes. Dime 3-2 alone supplies over half of these snaps, so he protects the middle hole and carries verticals from #3 with little help around him. Space tackling is the floor requirement. Coverage demand runs highest here: nearly three quarters of shell-match snaps are sub personnel. 33% of his snaps come from mugged formations. Walked into an A-gap before the snap, he either arrives with the rush or bails into coverage after showing it, and the bail is the hard part. Short-area burst plus coverage recovery is the trait pair that survives the assignment.

Physical 6'0 to 6'3, 220 to 240. Coverage movement outranks bulk.

In even, four-down fronts (69% of this spot's snaps)

Archetype Lurker

Physical 6'0 to 6'3, 220 to 240. Coverage movement outranks bulk.

Attributes to scout Man CoverageZone CoverageAccelerationHit Power

In odd, tite-spaced fronts (31% of this spot's snaps)

Archetype Lurker

Physical 6'0 to 6'3, 220 to 240. Coverage movement outranks bulk.

Attributes to scout Man CoverageZone CoverageTackle

No blitz attribute exists on the scouting panel. Blitz maps to Acceleration and Hit Power here.

SUBLB2Sub LB 54.4%Starter Lurker Man CoverageZone CoverageAccelerationHit Power

65% of snaps ask for the even_4down SUBLB job, 35% ask for the odd_tite SUBLB job. Holds the second level of the sub packages that carry most snaps. The job is coverage first, matching backs and tight ends underneath, with a late rush added when the assignment stays in to block. Sub fronts field both SUBLB tokens together, so this is a sign-two position. Covers from the middle of light boxes. Dime 3-2 alone supplies over half of these snaps, so he protects the middle hole and carries verticals from #3 with little help around him. Space tackling is the floor requirement. Coverage demand runs highest here: nearly three quarters of shell-match snaps are sub personnel. 24% of his snaps come from mugged formations. Walked into an A-gap before the snap, he either arrives with the rush or bails into coverage after showing it, and the bail is the hard part. Short-area burst plus coverage recovery is the trait pair that survives the assignment.

Physical 6'0 to 6'3, 220 to 240. Coverage movement outranks bulk.

In even, four-down fronts (65% of this spot's snaps)

Archetype Lurker

Physical 6'0 to 6'3, 220 to 240. Coverage movement outranks bulk.

Attributes to scout Man CoverageZone CoverageAccelerationHit Power

In odd, tite-spaced fronts (35% of this spot's snaps)

Archetype Lurker

Physical 6'0 to 6'3, 220 to 240. Coverage movement outranks bulk.

Attributes to scout Man CoverageZone CoverageTackle

No blitz attribute exists on the scouting panel. Blitz maps to Acceleration and Hit Power here.

Off-ball LBs Sign 2: 2 rotation Signal Caller 2 spots
MIKE1Off-ball LB 36.8%Rotation Signal Calleralt: Thumper Man CoverageZone CoverageTacklePursuitPlay Recognition

Runs free behind the trio. The front's job is to keep him unblocked, and his job is to make that matter, flowing tackle to tackle and finishing in the open field. On pass downs he owns the middle hook and carries #3 up the seam when the call asks. When it stays on the field the backers become the underneath matchers, taking final #3 and holding the middle hook against layered routes.

Physical 6'0 to 6'3, 235 to 255. Diagnose-and-go outranks size.

WILL1Off-ball LB 36.8%Rotation Signal Calleralt: Lurker Man CoverageZone CoverageSpeedPursuit

Scrapes behind a front built to keep him clean. He presses the line when the trio holds and falls back over the top when it slants, and his tackles come at full speed in pursuit. Flat and hook drops fill the pass downs. When it stays on the field the backers become the underneath matchers, taking final #3 and holding the middle hook against layered routes.

Physical 6'0 to 6'2, 225 to 245. Closing speed outranks size.

Open a row for the full job and the notes behind it. The text is on the page either way, so find-in-page still works.

Below the cutoff

RDT1, 6 snaps (2.94%), ignore tier per schema thresholds.

SS2, 6 snaps (2.94%), ignore tier per schema thresholds.

Prevent 3 Deep: 3 plays could not be mapped to a formation, so they sit outside the counts.

Built from 201 charted plays of 204 in the book. The football is verified against named coaching sources, and the attribute targets are verified against the in-game scouting screens.

Keep reading

See where 3-4 Shell ranks for the concepts you actually call in the CFB 27 Playbook Finder.

Coverage chalk talk that matches this style: how to run Quarters, how to run Palms and every match coverage term.