5VZ 3.4L Rear Sump Oil Pan Conversion Kit

Product Overview

The Off Road Solutions rear-sump oil pan conversion kit is engineered specifically for 5VZ-FE 3.4L V6 engine swaps into 1979–1995 Toyota trucks, 4Runners, and T100 applications. The factory oil pan on Tacoma, 4Runner, and Tundra donor engines positions the sump at the front of the block, directly interfering with the steering linkage, front suspension crossmember, and differential housing of earlier-generation Toyota trucks and 4Runners. This conversion kit relocates the sump, dipstick, and oil level tube to the rear of the block, solving the single most common installation obstacle in any first- or second-generation 5VZ-FE swap. Every component in this kit is a genuine new Toyota OEM part sourced from the correct T100 application, ensuring factory fit and seal integrity on your conversion build.

Available in two application-specific variants: the '79–'85 4WD, 2WD Truck, and SAS kit for solid-axle front suspension vehicles and solid-axle swap (SAS) builds, and the '86–'95 4WD IFS kit for trucks and 4Runners with independent front suspension. Note: for '79–'85 4WD vehicles retaining the original steering system with 0–3" of lift, the IFS oil pan kit may provide better clearance for steering components. Verify your application before ordering.

Key Features & Benefits

• Eliminates the #1 swap obstacle: Moves the oil sump from the front to the rear of the 5VZ-FE block, clearing suspension, steering, and axle housing components that would otherwise make installation impossible in 1979–1995 trucks and 4Runners.
• Complete kit — nothing left to source: Includes oil pan, sump, sump gasket, Toyota FIPG pan gasket maker, dipstick, dipstick tube, tube adapter, tube O-ring, plus a tap and plug to seal the original front dipstick hole — the most complete rear-sump kit available for this application.
• Genuine new Toyota OEM parts throughout: Every component is sourced from the correct T100 application, not remanufactured or aftermarket substitutes. Factory tolerances, factory sealing, factory durability.
• Two application-specific variants: The SAS/2WD kit and the '86–'95 IFS kit are each engineered for their respective chassis, ensuring correct pan geometry, sump placement, and dipstick tube routing for your specific swap configuration.
• Also solves the SAS Tacoma problem: This kit is the correct solution when performing a solid-axle swap (SAS) on a 1995–2004 Tacoma or 4Runner with the 5VZ-FE engine — the factory front-sump pan will contact the new axle housing and must be replaced for proper clearance and articulation.

 

Technical Specifications

Part Type: Complete Rear-Sump Oil Pan Conversion Kit
Engine Compatibility: 5VZ-FE 3.4L V6 (all years — Tacoma, T100, 4Runner, Tundra donor engines)
Kit Contents: Oil pan, oil sump, sump gasket, Toyota FIPG pan sealer, dipstick, dipstick tube, dipstick tube adapter, tube O-ring, ¼" NPT tap, ¼" NPT pipe plug
Variants Available: '79–'85 4WD / 2WD / SAS; '86–'95 4WD IFS
OEM Source Application: 1993–1998 Toyota T100
Sump Pan Bolt Torque: 66 in-lb (6mm sump nuts); 52 in-lb (oil pan mounting bolts) — criss-cross pattern required

Fitment

Year	Model	Engine
1979–1985	Toyota Pickup 4WD / 2WD (Solid Axle)	5VZ-FE 3.4L V6 Swap (SAS/2WD kit)
1984–1985	Toyota 4Runner (Solid Axle)	5VZ-FE 3.4L V6 Swap (SAS/2WD kit)
1986–1995	Toyota Pickup 4WD (IFS)	5VZ-FE 3.4L V6 Swap (IFS kit)
1986–1995	Toyota 4Runner 4WD (IFS)	5VZ-FE 3.4L V6 Swap (IFS kit)
1993–1998	Toyota T100 (all models)	5VZ-FE 3.4L V6 (OEM pan sourced from this application)
1995–2004	Toyota Tacoma (post-SAS)	5VZ-FE 3.4L V6 (SAS/2WD kit — required for solid-axle swap clearance)
1996–2002	Toyota 4Runner (post-SAS)	5VZ-FE 3.4L V6 (SAS/2WD kit — required for solid-axle swap clearance)

Important: Confirm your variant (SAS/2WD vs. IFS) before ordering — the oil pan geometry differs between kits. The '79–'85 SAS kit is correct for solid-axle front suspension vehicles. The '86–'95 IFS kit is correct for IFS trucks retaining factory independent front suspension. Exception: '79–'85 4WD trucks running the original steering system with 0–3" lift may benefit from the IFS oil pan for additional steering clearance. If your donor 5VZ-FE engine is from a 2000 or newer application, a new dipstick hole must be drilled in the block — do not attempt this without the ORS Dipstick Drill Guide.

Installation & Maintenance

Installation Difficulty: Advanced (engine must be removed from vehicle and inverted in an engine stand)
Tools Required: Engine stand, socket set, torque wrench (in-lb rated), ¼" NPT tap (included), drill and 7/16" bit (required for 2000+ blocks), Toyota FIPG sealant (included), punch and hammer
Professional Installation: Recommended — this step is performed with the engine on a stand prior to dropping it into the chassis. Engine inversion and precision tap/drill work require experience to avoid contaminating the crankcase with metal particles.

Maintenance Tips:

• Apply Toyota FIPG sealer (included) in a continuous bead, working it into all pan grooves and around mounting holes before installation — do not reuse old sealant or substitute with RTV not rated for oil immersion.
• Torque pan bolts to 52 in-lb in a criss-cross pattern and make a second verification pass — uneven torque is the most common cause of post-swap oil pan leaks on the 5VZ-FE.
• Take precautions to keep all metal particles out of the crankcase during tap-and-drill operations — cover crankcase components and thoroughly clean the block interior before final pan installation.
• Replace the oil drain plug gasket at every oil change service interval — the T100 pan uses a standard crush-type drain plug gasket that should not be reused.
• Verify that all sump mounting studs in the block are snug before reinstalling the sump — loose studs are a known issue on higher-mileage 5VZ blocks and will cause sump gasket failure.

 

Frequently Asked Questions

Q: Why does the 5VZ-FE engine need a rear-sump oil pan conversion for older Toyota trucks and 4Runners?
A: The 5VZ-FE 3.4L V6 installed in Tacoma, Tundra, and later 4Runner donor vehicles positions the oil sump at the front of the engine block. In 1979–1995 Toyota trucks and 4Runners, this front sump directly interferes with the steering shaft, front suspension components, and differential housing, making engine installation impossible without relocating the sump. Converting to a rear-sump layout with T100 OEM components relocates the oil reservoir to the back of the engine, providing the necessary clearance for a complete, clean swap.

Q: What is the difference between the SAS/2WD kit and the IFS kit?
A: The two kits use different oil pan castings designed for different front suspension configurations. The SAS/2WD kit uses the T100 2WD oil pan (12101-65030) and is correct for vehicles with solid-axle front suspension — including pre-1986 trucks, any vehicle with a solid-axle swap, and SAS Tacoma/4Runner builds. The IFS kit uses the T100 4WD oil pan and is designed for 1986–1995 trucks and 4Runners retaining their factory independent front suspension. Using the wrong pan can result in clearance issues with steering or axle components — always confirm your front suspension configuration before selecting a variant.

Q: Does this kit work on 2000 and newer 5VZ-FE donor engines?
A: Yes, but with an additional required step. Engine blocks from 2000 and newer 5VZ-FE applications do not have a pre-existing auxiliary dipstick hole on the driver-side of the block. A new hole must be drilled using a U-size (or 3/8") bit to accept the included dipstick tube adapter. The Dipstick Drill Guide is strongly recommended to ensure the hole is drilled at the correct angle and position — an off-center hole can result in a poor adapter fit and potential oil leak.

Q: Can I reuse my original 3VZ-E oil pan baffle with the new T100 sump?
A: No. Do not use a 3VZ-E baffle between the block and the new T100 pan — this is a documented fitment issue in the 5VZ swap community. The 5VZ-FE oil baffle fasteners may also need to be rearranged to clear the new sump geometry. Confirm baffle clearance during the dry fit before applying sealant.

Q: Is this kit also required for solid-axle swaps on 1995–2004 Tacomas and 4Runners?
A: Yes. When performing a solid-axle swap (SAS) on a Tacoma or 4Runner with the factory 5VZ-FE engine, the stock front-sump oil pan will contact the new axle housing and solid-axle steering components at full articulation. The SAS/2WD variant of this kit is the correct solution — it provides the necessary front-end clearance for proper suspension travel and off-road flex on a Tacoma or 4Runner converted to solid axles.

Q: What is included versus what I need to supply?
A: This complete kit includes: genuine Toyota OEM oil pan, oil sump, sump gasket, Toyota FIPG pan gasket maker/sealer, dipstick, dipstick tube, dipstick tube adapter, dipstick tube O-ring, ¼" x 18 NPT tap, and ¼" NPT pipe plug to seal the original front dipstick hole. You will need to supply: engine oil for refill, an engine stand for safe inversion, standard hand tools, a torque wrench (in-lb rated), and, for 2000+ blocks, a drill, 7/16" bit, and the Dipstick Drill Guide.

Common Symptoms That This Conversion Is Required

• 5VZ-FE donor engine will not lower into a 1979–1995 Toyota truck or 4Runner chassis — the front sump contacts the steering shaft or suspension crossmember before the engine reaches the mount position.
• Oil pan contact with solid-axle housing or knuckle assembly during test-fit on an SAS build — the factory Tacoma/4Runner front sump protrudes directly into the axle's path.
• Steering shaft or torsion bar clearance issues on IFS builds where the front sump prevents full engine seating on the mounts.
• Oil pan contact with solid-axle housing at full articulation on a completed SAS Tacoma — the factory front-sump hits the axle under flex, requiring conversion even after the vehicle is on the road.
• Dipstick inaccessible or missing after swap — without the T100 dipstick tube assembly, there is no oil level check point in rear-sump converted 5VZ-FE applications.

 

Why Use Genuine OEM Parts for Your 5VZ-FE Oil Pan Conversion

The oil pan conversion is the first critical step in any 3.4L 5VZ-FE engine swap, and it's performed with the engine fully inverted on a stand before installation. This is not the place to gamble on fitment. The T100 is the only Toyota application that used the 5VZ-FE with a rear-sump oil pan from the factory, which is why T100-sourced OEM parts are the engineering benchmark for this conversion — not aftermarket approximations.

The sealant integrity of the oil pan-to-block joint is especially critical on the 5VZ-FE because the pan must seal against an aluminum block surface that has often been thermally cycled thousands of times on a used donor engine. Toyota FIPG (Formed-In-Place Gasket) sealer — included in this kit — is specifically formulated for this sealing surface. Generic RTV substitutes behave differently at operating temperature and are a known source of early post-swap oil leaks in the Toyota truck community.

T100 oil pans are increasingly difficult to source used, and used pans carry unknown wear history, potential cracks, and thread damage that only reveals itself under pressure. This kit supplies a new, genuine Toyota oil pan, ensuring that the foundation of your 5VZ swap starts clean and sealed — without the calendar-time risk of hunting down a serviceable used oil pan from a salvage yard.

Whether you're dropping a 5VZ-FE into a first-gen pickup, a second-gen 4Runner, or converting a Tacoma to a solid axle, the rear-sump oil pan conversion is the first step and the only permanent one — there is no rework path once the engine is in the chassis. Do it correctly the first time with genuine OEM Toyota components.