Remanufactured 4WD crate transmissions dyno tested in-house
Advanci Adapters builds and supplies heavy-duty manual and electronic automatic crate gearboxes for 4×4 swaps, rock-crawling rigs, and heavy tow repowers. Every unit undergoes complete teardown, magnaflux casing crack inspection, bearing upgrades, and spin-dyno testing at our Paso Robles shop before freight dispatch.
Pricing depends on transmission make and model, new crate versus remanufactured build, tailhousing pattern, and output shaft spline count. Price strictly excludes freight.
How do you prevent cracked casing webbing under transfer case leverage?
A heavy 4WD transfer case hanging off an unbraced transmission tailhousing acts as a massive torque multiplier over washboard terrain. Salvage yard gearboxes frequently conceal micro-fractures along the intermediate plate bolt bosses and countershaft support webs. If you install a core with hairline stress cracks, the casing flexes under load, pushes the cluster gear out of parallel, and shears third-gear teeth within five hundred miles.
We reject any core showing casing fatigue. Every manual and automatic transmission received at our 4320 Aerotech Center Way facility is completely stripped to bare cast aluminum or ductile cast iron shells. Housings are hot-tank degreased and subjected to wet-method magnaflux magnetic particle crack inspection under ultraviolet inspection lamps. If the casting shows any defect across bearing bores, countershaft pockets, or tailhousing flange circles, it is scrapped. We rebuild solely on structurally pristine casings.
Will the input shaft runout destroy my pilot bushing and transfer case seal?
Radial runout exceeding five thousandths of an inch generates catastrophic driveline harmonics at cruising speeds. When an input shaft wobbles inside the pilot bushing, it side-loads the front countershaft bearing, ovalizes the front seal retainer, and permits oil contamination on the clutch disc. At the rear, an out-of-true output shaft destroys the transfer case input seal and rattles the adapter coupler sleeve.
Every remanufactured crate transmission from Advanci is verified on our inspection table with a magnetic-base Mitutoyo dial indicator. Total indicated radial runout across the input shaft pilot snout and output shaft splines is measured directly against the casing register face and held to four thousandths of an inch (0.004″) or tighter. If a shaft fails this tolerance, it is rejected and replaced with a new heat-treated 4140 chromoly shaft.
Following mechanical assembly, each unit is mounted on our spin-dyno stand. We drive the input shaft through every forward gear and reverse under simulated hydraulic head pressure, verifying synchro engagement, shift rail detent firmness, pump pressure in automatics, and zero seal weepage before the unit is sealed for crate dispatch.
What determines the exact price between $2,348 and $3,930 USD?
We do not issue vague flat-rate quotes. Drivetrain conversions require exact specifications because spline counts, gear ratios, and tailhousing castings directly change material and labor costs.
Five concrete factors decide your final transmission quote:
- Transmission Make & Model: A standard manual 5-speed crate unit sits near the $2,348–$2,890 floor; heavy-duty 6-speed electronic overdrive automatics reach the $3,120–$3,930 ceiling.
- Transfer Case Spline Count: Standard 23-spline, 27-spline, 31-spline, or heavy 32-spline output shafts match specific transfer case input gears.
- New Crate vs. Remanufactured: Brand-new OEM crate castings carry higher base materials cost than factory-remanufactured cores.
- Housing Material & Pilot Register: Ductile iron rear adapter extensions versus heat-treated A356-T6 cast aluminum tailhousings.
- Hardware & Bushing Pack: Inclusion of tailored bronze pilot bushings, sealed roller bearings, and grade-8 mounting studs.
Lead time is based strictly on current warehouse inventory in Paso Robles. In-stock units crate within two business days; custom splined configurations ship according to the current bench build schedule.
| Gearbox Model | Transmission Type | Output Splines | Casing Material | Indicative Price |
|---|---|---|---|---|
| NV4500 HD | 5-Speed HD Manual | 29-spline Dodge / 32-spline GM | Cast Iron / Aluminum Top | $2,580–$3,290 USD |
| GM 4L80E | 4-Speed HD Automatic Overdrive | 32-spline 4WD Crate | A356-T6 Heat-Treated Aluminum | $2,640–$3,480 USD |
| GM 6L80E | 6-Speed Heavy Automatic | 32-spline 4WD Configuration | Reinforced Aluminum Housing | $3,120–$3,930 USD |
| Ford ZF5 | 5-Speed Heavy Manual | 31-spline 4×4 Output | One-Piece Aluminum Bellhousing | $2,490–$3,180 USD |
| Jeep AX15 | 5-Speed Medium Manual | 23-spline 4WD Crate | Lightweight Ribbed Aluminum | $2,348–$2,890 USD |
Four steps from bare casing to freight crate
Our drivetrain engineering lead has directed conversions in Paso Robles since 2018. We do not skip inspection steps or reuse suspect wear components.
Step 1: Complete Teardown & Magnaflux Testing
The core is stripped of all seals, bearings, snap rings, and shafts. Bare casings are pressure washed in hot solvent and inspected under ultraviolet light with magnetic particle powder to expose concealed stress cracks in webbing.
Step 2: Hard-Part Replacement & Upgrades
All friction plates, synchronizer rings, needle rollers, and main bearings are discarded. We install premium carbon-composite or high-tin bronze synchros, Torrington thrust bearings, and heavy-duty shift fork pads.
Step 3: Dial Indicator Runout & End-Play Shimming
Shafts are installed into the casing and clamped to torque specifications. Technicians set countershaft and mainshaft end-play using precision ground steel shims, holding runout to 0.004 inches maximum.
Step 4: Spin-Dyno Validation & Timber Crating
The transmission is coupled to our electric test bench, filled with break-in fluid, and run through every gear under load. We check hydraulic line pressure and acoustic gear mesh pattern, drain fluid, install transit plugs, and bolt the unit into a timber crate.
Straight answers on fitment limits and swap constraints
Will an NV4500 bolt directly to my factory transfer case?
Rarely without an adapter plate. The GM NV4500 uses a 32-spline output shaft with a round 6-bolt or circular 4-bolt pattern, whereas Dodge configurations use 23 or 29 splines. If you are mating to a Dana 300, NP205, or NP241, you need our indexable conversion adapter and spud shaft.
Do you sell uninspected cores or partial reseal kits?
No. We refuse to sell uninspected salvage units or cosmetic “reseal” gearboxes. A transmission with good external paint and worn internal synchro hubs will drop out of gear under compression braking. Every unit leaving our shop is fully remanufactured.
Who is this service not for?
This is not for builders seeking sub-$500 budget wrecking yard units or light-duty passenger car front-wheel-drive gearboxes. We only build heavy-duty rear-wheel and four-wheel-drive truck and SUV gearboxes capable of sustaining 400+ foot-pounds of input torque over rough terrain.
Advanci Adapters holds official business registration in Paso Robles, California (ZIP 93446). All machining, magnaflux testing, and crating operations are performed at 4320 Aerotech Center Way under the direction of our Transmission Engineer.
Request transmission build verification & quote
Because transmission conversions involve critical input shaft lengths, spline profiles, and bellhousing depths, our engineering desk reviews every inquiry before quoting.
Inquiry Policy: Quotes are valid for 30 calendar days and depend on warehouse stock in Paso Robles. No credit card or automated checkout required.
Call directly: 800-350-2223 • [email protected]