What The 8300016 Is
The 39MT is a gear-reduction starter, not a straight direct-drive unit. The armature spins fast and light, and a planetary set multiplies torque at the pinion. That means less current draw off the battery bank for the same cranking effort, which matters on a 24V system pulling a cold high-compression diesel over.
Build specs on this unit: 24 volts, 11-tooth pinion, 6/8 pitch, clockwise rotation, SAE 3 mounting flange. Polarity is insulated, so the ground path runs through a cable rather than the housing. The solenoid is sealed for high-cycle service where the truck sees repeated starts through a shift.
Our version is an aftermarket direct replacement built to the same mounting and drive geometry. It is not an OEM part and we are not affiliated with any OEM. The numbers on this page are listed so you can identify the unit you already have.
Why These Numbers Cross
8300016, 8200321 and 41012320 all describe the same physical starter configuration: 39MT frame, 24V, 11-tooth 6/8 pitch pinion, clockwise, SAE 3 mount, insulated ground. Delco Remy 8200321 is a catalog number for that build. J&N 41012320 is the same unit under a rebuilder's numbering system. Different books, same starter on the flywheel housing.
Starter numbers usually split on three things: voltage, pinion tooth count and pitch, and mount pattern. Get any one of those wrong and the unit either will not bolt up or will chew the ring gear. Because all three of these numbers land on identical values for those variables, they interchange in the field.
The trap is the 12V version of the 39MT. It looks nearly identical from six feet away and shares the same mount. Read the voltage tag on the old starter before you order. A 12V unit on a 24V bank will not survive the first crank.
Check Before You Order
Pull the old starter or at least get eyes on the nameplate. Write down the voltage, count the pinion teeth, and confirm the mount is SAE 3. Then verify your engine serial number. This cross-reference is a starting point for identification, not a fitment promise, and final confirmation comes off the number on the unit you removed.
Before you condemn the starter, load-test the batteries and check both the positive feed and the ground cable at the block. A voltage drop test while cranking finds bad cables fast. Slow crank with clean batteries usually means brushes or a dragging bendix. A single loud click with no rotation usually points at the solenoid contacts.
8300016 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 8300016. Use them to identify the part — then confirm the exact fit by VIN or the number stamped on your old unit before you order. An interchange is a starting point, not a fitment guarantee.
| Brand / Line | Cross-Reference Numbers |
|---|---|
| Delco Remy | 8200321 |
| J&N | 41012320 |
Frequently asked questions
Is 8200321 the same starter as 8300016?
They describe the same 39MT build: 24V, 11-tooth 6/8 pitch pinion, clockwise rotation, SAE 3 mount, insulated ground. Delco Remy 8200321 is listed here for identification only. Confirm the voltage and tooth count on your old starter before ordering.
How do I tell a 24V 39MT from a 12V one?
Read the nameplate on the starter body first, since that is the only reliable answer. Then check the truck: count the batteries and how they are wired in series. The two versions share the same frame and SAE 3 mount, so you cannot judge by shape.
My starter clicks once and nothing turns. Bad starter?
Not necessarily. A single click with no rotation is often the solenoid contacts or a poor ground path. Load-test the batteries and run a voltage drop test on the positive cable and the block ground while cranking. If the cables are clean and voltage holds, the starter is the suspect.
Not sure it fits? We check before you pay.
Run your VIN and we’ll match parts to your exact truck, or call the counter — a person who knows trucks verifies fitment by OEM number before the order ships. No wrong-box returns.
More cross-reference guides
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Every part below is a Premium Quality aftermarket Direct Replacement with published OEM cross-reference numbers, a 6+ month warranty and same-business-day shipping from Tacoma, WA. Not sure it fits? Run your VIN — or call and a person who knows trucks will verify fitment before you pay.