Description

Transmission Technologies ES65-5, CM50, 60 SERIES, 50 SERIES 2000 Service Manual

If you’ve ever had a transmission job go sideways because you were working off a photocopy of a photocopy, you know the value of a factory manual. I’m Mike Callahan, ASE Master Technician with 28 years turning wrenches in San Antonio. I’ve seen guys lose half a day on a simple shifter housing because they trusted a generic aftermarket guide. This Transmission Technologies ES65-5, CM50, 60 SERIES, 50 SERIES 2000 Service Manual is the real deal – OEM documentation printed by Transmission Technologies Corporation, bulletin number 2342-7. 49 pages, no filler.

Drop this on your workbench and you get the exact same procedures the factory techs used when these units were new. Every torque spec, every clearance, every step in the right order. No guessing which way the snap ring faces.

What This 49-Page Manual Covers

The manual breaks into five major sections. General Service and Maintenance Recommendations (pages 4-5) gives you the fluid specs and inspection intervals. Overhead Control (pages 6-7) walks through disassembly, inspection, and reassembly of the shift tower. Shifter Housing (pages 8-11) covers disassembly, assembly, and mounting to the case. Gears and Case (pages 12-31) is the meat – complete disassembly and reassembly for the CM50 model, including mainshaft and countershaft work. Then Gears and Case for ES65-5 and CM60 (pages 32-42) handles the different internals on those models. You get all four variants: CM50, ES65-5, 60 SERIES, and 50 SERIES.

Overhead Control and Shifter Housing: Step-by-Step Procedures

Page 6 starts the Overhead Control section with a clear disassembly sequence. You need a punch set and a soft-face hammer – no exceptions. The inspection checklist on page 6 calls out wear limits for the shift fingers and detent springs. Skip that step and you’ll be pulling the shifter back off after reassembly. The reassembly on page 7 includes the correct O-ring part numbers and the order for installing the snap rings. Aftermarket manuals often combine the shifter housing and overhead control into one vague procedure. This manual keeps them separate because they require different tools and measurements.

Gears and Case: Mainshaft End Play and Reassembly

Page 29 has the mainshaft end play procedure that most techs screw up. You set the end play with a specific thickness of shim – the manual tells you how to measure the gap with a dial indicator and then select the shim from the factory chart. For the CM50, the mainshaft disassembly starts on page 17 with a detailed breakdown of the gear stack and synchronizers. Reassembly on pages 22-27 includes the correct order for each washer and spacer. I’ve seen guys throw a 0.010-inch shim in because they thought it looked right. That causes brinelling on the bearings within a few thousand miles.

Why OEM Factory Specs Beat Aftermarket Copies

Every spec in this manual came from Transmission Technologies engineering department. Not a third-party vendor who scanned a faded copy and guessed at the torque values. The shifter housing bolt torque, the mainshaft nut torque, the countershaft bearing clearance – all from the OEM. I keep a set of these on my shelf because I don’t trust aftermarket documentation on principle. If you’re rebuilding an ES65-5 or CM50 and you don’t have the factory torque table, you’re gambling with someone’s driveline. Understand the basics of a manual transmission and then apply the specific specs from this manual.

Who Needs This Manual – and Why

If you’re a DIYer pulling a 60 SERIES transmission out of a medium-duty truck, you need this manual. If you’re a shop owner with a CM50 on the bench and a customer waiting, you need this manual. Beginners should not attempt a full gear case rebuild without factory documentation – one misaligned synchronizer ring and the whole box grinds on the test drive. The manual assumes you have basic mechanical skills and a torque wrench, but it holds your hand through the tricky parts like mainshaft end play and countershaft preload. 49 pages is enough to cover everything without wasting your time.

Does this manual cover the ES65-5 model?

Yes. The ES65-5 is covered in the Gears and Case section starting on page 32, with separate disassembly and reassembly procedures for that model.

What torque values are listed for the mainshaft nut?

The manual lists the exact torque specification for the mainshaft nut on page 29 within the end play procedure. It also includes the counter torque needed to hold the shaft. Never guess on these – using the wrong torque can cause the gear stack to shift under load and destroy the transmission. The spec is given in ft-lbs with the proper lubrication note. You’ll need a torque wrench capable of at least 250 ft-lbs for the larger models.

This factory manual eliminates the guesswork. You get the same information the Transmission Technologies field service reps carry. Access the Factory Manual and keep it on your tablet or print it – either way, you’ve got the OEM data that keeps your rebuilds solid.

Related Manuals

• Transmission Technologies PS 140-7A, PS 125-7B Service Manual – OEM
• PS105-7LL, 9505-2A, PS130-6L, 9505-2B Service Manual (2000)
• CM40 Series Transmission Parts Catalog TTC