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YJ
YJ Wrangler
1987–1995
The square-headlight Wrangler, purpose-built for the power it deserved from the factory.
The YJ Wrangler shares much of its drivetrain architecture with the earlier CJ series, making it a natural candidate for the LS swap. Body-on-frame construction and a well-understood chassis mean the engineering work is solved — it's just a matter of having the right parts. Novak's YJ kit gives you exactly that.
Transmission: 4L60E
The core mechanical components - engine mounts, transmission adapter, and the structural hardware that makes the LS engine fit correctly. Everything here must be right before the rest of the swap can happen.
A broader configured kit focused on the systems that make the swap driveable: cooling support, wiring integration, and transmission ancillaries selected for this application.
The fullest configured kit for this application, adding the electronics, tachometer solutions, and finishing components chosen for a more comprehensive conversion.
Click any part name or photo to view its product page. A checkmark means the part is explicitly included in that kit configuration.
| Part | Foundation | Essential | Complete |
|---|---|---|---|
| Adapters | |||
4L61-23
4L60E/4L65/4L70 to NP207/NP231/NP241/NP241OR/NP242/NP249 Adapter, 23-Spline
|
✓ | ✓ | ✓ |
| Cooling | |||
OT6082
Radiator Overflow Tank, 3" x 10", Polished Stainless
|
— | ✓ | ✓ |
K-OC-H7B-N
Auxiliary Transmission Cooler, 30,000 BTU (With Fittings) Northern
|
— | ✓ | ✓ |
TR-FLX
Braided Stainless Auto Trans Cooler Lines, Dual -6AN, 74" OAL
|
— | ✓ | ✓ |
FX3300-T
Jeep YJ/TJ Electric Fan & Shroud Assembly, Max Performance (Only fits Novak radiator)
|
— | ✓ | ✓ |
K-YJ30H
Jeep YJ Wrangler Radiator for LS Gen 3/ Gen 4 Engine swap
|
— | ✓ | ✓ |
| Electrical | |||
SGI-100BT
Universal Speedometer & Tachometer Signal Interface Module
|
— | — | ✓ |
| Engine Parts | |||
AI4-K
LS Gen III Cold Air Intake Kit
|
— | ✓ | ✓ |
12558346
Plug, EGR block-off, 1997 C5 LS1, 1998-2000 F-body LS1, 1999-2001 Vortec
|
— | ✓ | ✓ |
G3EV1
GM Gen III Intake EVAP Block-Off Plug
|
— | ✓ | ✓ |
2361
GM Oil Level Sensor Plug w/ Sealing Washer (4.5" x 2.2" x 1")
|
— | ✓ | ✓ |
G3EV2
GM Gen III Intake EVAP Relocation Kit
|
— | — | ✓ |
G3VP
Gen III Manifold Adapter Vacuum Port (Power Brake Hose)
|
— | ✓ | ✓ |
G3TC
GM LS Gen III Engine Top Cover
|
— | — | ✓ |
| Exhaust | |||
EH001
Gen III/IV Block Hugger Headers, Stainless, Ceramic Coated, V-Band
|
— | ✓ | ✓ |
| Mounts | |||
MMYJ-G3
Jeep YJ to LS Gen III/IV Engine Mounts
|
✓ | ✓ | ✓ |
RMU
Jeep Rear Transmission Mount (Polyurethane, Novak Style)
|
✓ | ✓ | ✓ |
MP59
GM P59 ECM Mount Bracket, Steel (Zinc Plated)
|
— | — | ✓ |
| Other | |||
231XS
NP231 Slip Yoke Eliminator, Ultra-Short
|
— | ✓ | ✓ |
5202308
231XS Kit Wiring Harness With Plug
|
— | ✓ | ✓ |
SK2X
Jeep YJ/TJ/XJ/MJ shifter assembly with NP207/NP231/NP242 (cane version)
|
— | ✓ | ✓ |
K100-NP231
NP231 shift knob billet engraved (cylinder styler)
|
— | ✓ | ✓ |
231MR-1
NP231 Transfer Case Master Rebuild Kit (1987-1993)
|
— | — | ✓ |
F-7TTC
CJ/YJ Transmission Tunnel Cover (Customizable)
|
— | — | ✓ |
These items aren't in the discount kits but are commonly needed for a complete YJ LS swap.
TR-4L60EL2
4L60E Transmission, Level II, TurnKey
G3EV1
GM Gen III Intake EVAP Block-Off Plug
G3EV2
GM Gen III Intake EVAP Relocation Kit
Transmission: AX15
The core mechanical components - engine mounts, transmission adapter, and the structural hardware that makes the LS engine fit correctly. Everything here must be right before the rest of the swap can happen.
A broader configured kit focused on the systems that make the swap driveable: cooling support, wiring integration, and transmission ancillaries selected for this application.
The fullest configured kit for this application, adding the electronics, tachometer solutions, and finishing components chosen for a more comprehensive conversion.
Click any part name or photo to view its product page. A checkmark means the part is explicitly included in that kit configuration.
| Part | Foundation | Essential | Complete |
|---|---|---|---|
| Adapters | |||
GM621-LS-K
GM Gen III/IV to Muncie/Saginaw Bellhousing, 4-1/16" Bore, 12" Clutch
|
✓ | ✓ | ✓ |
GMAX15
AX15 to GM Bellhousing Adapter (Small Block Chevy & LS)
|
✓ | ✓ | ✓ |
LS400-35X
GM LS Gen III/IV Flywheel, 168T, Offset, 35 lb, for up to 12" Clutch (6 bolt)
|
✓ | ✓ | ✓ |
330-2802
LS Crank Bolts, Extended Length, 11mm x 1.5, Qty 6
|
✓ | ✓ | ✓ |
04-049
GM/Chevy V8 Clutch Kit 11", 10 Spline x 1-1/8"
|
✓ | ✓ | ✓ |
|
910
Bolts, 3/8-16 x 1, hex head, grade 8, black, GM pressure plate, set of 6
|
✓ | ✓ | ✓ |
TB1
Novak Adjustable Throwout Bearing, GM Version
|
✓ | ✓ | ✓ |
PB-6071357
Pilot Bushing, GM Gen III (2001-) to Jeep T14/T15/T18 & AX15 (1992-1999) / NV3550
|
✓ | ✓ | ✓ |
HCRC-34
GM Bellhousing Hydraulic Slave Cylinder Retrofit, 3/4" Bore (Small Block Chevy & LS style)
|
✓ | ✓ | ✓ |
HCR9-K
Stainless Braided Clutch Line, 3AN Female Ends, With Fittings
|
✓ | ✓ | ✓ |
K-HCA-2
Hydraulic Clutch Line Adapter Fitting, Late Style Long (Typ. YJ)
|
✓ | ✓ | — |
53004466
1987-1990 Jeep YJ Clutch Master Cylinder
|
— | — | ✓ |
| Cooling | |||
|
OT6082
Radiator Overflow Tank, 3" x 10", Polished Stainless
|
— | ✓ | ✓ |
|
FX3300-T
Jeep YJ/TJ Electric Fan & Shroud Assembly, Max Performance (Only fits Novak radiator)
|
— | ✓ | ✓ |
|
K-YJ30H
Jeep YJ Wrangler Radiator for LS Gen 3/ Gen 4 Engine swap
|
— | ✓ | ✓ |
| Electrical | |||
|
SGI-100BT
Universal Speedometer & Tachometer Signal Interface Module
|
— | ✓ | ✓ |
| Engine Parts | |||
|
AI4-K
LS Gen III Cold Air Intake Kit
|
— | ✓ | ✓ |
|
2361
GM Oil Level Sensor Plug w/ Sealing Washer (4.5" x 2.2" x 1")
|
— | ✓ | ✓ |
|
G3VP
Gen III Manifold Adapter Vacuum Port (Power Brake Hose)
|
— | ✓ | ✓ |
|
G3TC
GM LS Gen III Engine Top Cover
|
— | — | ✓ |
|
12558346-K
GM LS EGR Block-Off Kit (1997 C5 LS1, 1998-2000 F-Body LS1, 1999-2001 Vortec)
|
— | — | ✓ |
|
G3EV1
GM Gen III Intake EVAP Block-Off Plug
|
— | — | ✓ |
|
G3EV2
GM Gen III Intake EVAP Relocation Kit
|
— | — | ✓ |
| Exhaust | |||
|
EH001
Gen III/IV Block Hugger Headers, Stainless, Ceramic Coated, V-Band
|
— | ✓ | ✓ |
| Fuel | |||
|
5003861AA
Module, pump, fuel sender assembly, 1991-1995 YJ Wrangler
|
— | — | ✓ |
|
FSK-YJLR
YJ GM Fuel Pump Integration Kit (1991-1995, Regulated)
|
— | — | ✓ |
| Mounts | |||
|
MMYJ-G3
Jeep YJ to LS Gen III/IV Engine Mounts
|
✓ | ✓ | ✓ |
RMAX15
AX15/NV3550 Universal Adjustable Rear Transmission Mount
|
✓ | ✓ | ✓ |
|
MP59
GM P59 ECM Mount Bracket, Steel (Zinc Plated)
|
— | — | ✓ |
| Other | |||
|
SK2X
Jeep YJ/TJ/XJ/MJ shifter assembly with NP207/NP231/NP242 (cane version)
|
— | ✓ | ✓ |
231SYE-1
NP231 Slip Yoke Eliminator, Standard Length (YJ/TJ)
|
— | ✓ | ✓ |
|
F-7TTC
CJ/YJ Transmission Tunnel Cover (Customizable)
|
— | ✓ | ✓ |
|
231MR-1
NP231 Transfer Case Master Rebuild Kit (1987-1993)
|
— | — | ✓ |
|
K100-NP231
NP231 shift knob billet engraved (cylinder styler)
|
— | — | ✓ |
These items aren't in the discount kits but are commonly needed for a complete YJ LS swap.
TR-AX15
AX15 Manual Transmission, TurnKey, New
G3EV1
GM Gen III Intake EVAP Block-Off Plug
G3EV2
GM Gen III Intake EVAP Relocation Kit
K-AX15-ST
AX15 Short Throw Shifter Kit
AX15MR
AX15 Transmission Master Rebuild Kit Deluxe
Built From Actual Swap Experience
The YJ Wrangler LS swap has been done hundreds of times by Novak customers and engineers. The parts in this kit are not assembled from a catalog - they're what works, confirmed by the people who have done it.
The Straightforward Answer
The biggest challenge in an LS swap isn't the fabrication - it's knowing what to buy. This kit removes that obstacle. It's Novak's direct answer to the question every builder eventually asks: "What do I actually need?"
Component Links to Expert Guidance
Every part links to its own product page with detailed specifications, application notes, and engineering documentation. You're not just buying parts - you're buying access to the knowledge behind them.
Three Tiers for Every Budget
Not every builder wants to do the full conversion in one shot. The Foundation tier lets you start with the mechanical core and add systems as your build progresses. The Complete tier ensures nothing is missed on a ground-up swap.