Description

Dana Spicer C320 1999 Service Manual – Factory Torque Converter Rebuild Specs

If you’ve ever torn down a torque converter only to find the aftermarket guide had the wrong ring gear torque, you know the feeling. That’s why this 1999 factory service manual—the original Dana Spicer C320 1999 Service Manual—exists. 42 pages of specs written by the engineers who built the unit. Not some third-party reprint. This is the same document BTI reprinted with permission from Dana Corporation back in 1999, document number 150-7124. Every oil pressure spec, every clearance, every step is what the factory intended.

I’ve been turning wrenches since before most of you were born. The C320 torque converter appears on rockbreaker equipment, off-highway machinery, and industrial power units. When that converter starts slipping or leaking, you don’t need guesswork. You need the page that tells you the charge pump priming procedure, the converter drive plate bolt pattern, and the exact oil flow path. That’s what this service manual delivers.

Let me walk you through what’s inside these 42 pages so you know exactly what you’re buying.

C320 Torque Converter: 42 Pages of Factory Specs

The manual opens with a foreword on page 1 that includes a warning about towing or push-starting vehicles with this transmission. Page 3 specifically says you have to lift the rear wheels off the ground or disconnect the driveline to avoid transmission damage. That’s the kind of detail aftermarket PDFs skip. The Table of Contents then lists every chapter you need for a full overhaul: How the Units Operate, Torque Converter Assembly, Internal Oil Flow, Assembly Instructions, Disassembly of Torque Converter, Cleaning and Inspection, Reassembly of Torque Converter, and Oil Pressure and Lubrications Specifications. No fluff. Just procedures.

How the Units Operate – Internal Oil Flow Explained

Before you start wrenching, you need to understand how the converter works. The manual’s section on How the Units Operate walks through the hydraulic circuit. Then Internal Oil Flow diagrams show you where pressure goes during lockup and stall. If you’re chasing a low-charge-pressure complaint, you start here. The factory does not assume you know the system. They explain it. Then they give you the Oil Pressure and Lubrications Specifications chapter with the exact numbers. Page numbers aren’t printed in the TOC, but the spec section is easy to find after the reassembly steps.

Disassembly of the Torque Converter – Step-by-Step

This is where the real work happens. The manual splits it into Disassembly of the Torque Converter and then Overhaul Instructions for Torque Converter. It tells you to clean and inspect every part—the stator, the turbine, the cover. It then gives the 16 Screw Ring Gear Installation Procedure specifically for non-asbestos ring gears. That procedure is not in generic manuals. It’s unique to the C320. The reassembly section includes Converter Installation and Converter Drive Plate Installation Instructions. Each step expects you to have the correct tooling. This is not a light reading manual. It’s a workbench document.

Oil Pressure and Lubrication Specifications – Critical Numbers

You want to know charge pressure? It’s in the Oil Pressure and Lubrications Specifications section. The manual also covers Converter Charge Pump Replacement and Priming Procedure—a step many skip and then wonder why the converter burns up. Without the right prime, you’ll starve the bearings. The manual explicitly lists the priming steps. Torque specs for the converter drive plate and ring gear bolts are part of the assembly chapters. These are Dana Spicer’s numbers, not some aftermarket translation. Use them or risk leaks and converter separation.

3 Reasons to Choose Factory Dana Spicer Documentation

First, the source. This manual was published by Dana Corporation in 1999 and reprinted by BTI for their rockbreaker equipment. The document number 150-7124 matches the original Dana Spicer C320 manual. It has not been scanned, OCR’d badly, or re-typeset. You’re looking at the genuine factory layout. Second, the content covers the entire service lifecycle: disassembly, cleaning, inspection, reassembly, and installation. You also get the Servicing Machine After Torque Converter Overhaul procedure and the Speed Sensor Installation steps. Third, the torque values are factory-original. No one guessed them. They came from Dana’s engineering department. If you want to rebuild a C320 correctly, this is the document.

The manual also includes a chapter on Irregularities in Performance—a troubleshooting section that diagnoses common converter complaints. It’s short but direct. Pair this with the Dana Spicer C320, C2000, C270, C330, C5000 Technical Manual for broader coverage of the Spicer off-highway product line. If you’re working on other Dana transmissions, also check the Dana Spicer 1372-A Service Manual – Factory Specs & Rebuild Guide and the Dana Spicer ES60-5, CM59, ES60-5A, ES60-5C, ES60-5D Service Manual. For general theory on torque converters, reference the Manual Transmission category on Wikipedia for understanding the differences between converter types.

Does this manual cover the converter charge pump replacement?

Yes, the manual includes a dedicated Converter Charge Pump Replacement and Priming Procedure section.

What torque specifications are included in the Dana Spicer C320 manual?

The manual contains torque values for the 16 screw ring gear installation, converter drive plate bolts, and transmission-to-engine mounting fasteners. The reassembly chapters list torque specs step-by-step, not in a generic table. You also get the oil pressure specifications for the charge pump and lubrication circuit. Aftermarket manuals often omit these numbers or copy them from different models. Using factory-specified torque here prevents stripped threads in aluminum housings, converter separation at high RPM, and oil leaks at the ring gear joint. The manual also warns about proper lubrication on threads where specified. If you are rebuilding a C320, you need those exact numbers.

After 28 years in the shop, I can tell you the difference between a rebuild that lasts and one that fails in six months is whether you had the factory specs in front of you. The Dana Spicer C320 Service Manual gives you those specs. Don’t waste time on reprints that leave out the priming procedure or the speed sensor gap. Get the real document. Access the Factory Manual now and put it on your workbench.