Transmission Digest

09/22/2025

Don't miss the digital edition of the September issue of TD! It includes:

- 10R80 Stuck in Park After Rebuild (pg. 4);
- GM 10L1000 Casting Identification and Clutch Application (pg. 8);
- The Hidden Cost of Corrosion: Diagnosing Electrical Faults in Modern Transmissions (pg. 14 and on the cover);
- Three Rules for Transmission Diagnosis (pg. 17);
- Jeep Renegade 948TE: No movement and no park (pg. 20)
- Nissan RE0F10A no first gear or throttle response (pg 21); and
- Old Equipment, New Life (pg. 22).

Read it here: https://bit.ly/3yIz5ku

09/19/2025

The complaint: A 2012 Ram 3500 with a 6.7 liter diesel engine and a 4×4 AS68RC transmission has a complaint of transmission fluid leaking from the transfer case vent. The transfer case was found to be over-full and the transmission fluid level was low.

For the cause and the correction, read our story here:

A 2012 Ram 3500 with a 6.7 liter diesel engine and a 4x4 AS68RC transmission has a complaint of transmission fluid leaking from the transfer case vent.

09/18/2025

In today’s episode of the Builder’s Bench, we’ve got a classic American muscle car as the topic: the Chevy Camaro. More specifically: the 2018 Camaro SS with a 6.2-liter engine and an 8L90 transmission. There’s an issue that’s specific to this year and engine we get into on this episode.

Watch the full episode here:

In today's episode of the Builder's Bench, we've got a classic American muscle car as the topic: the Chevy Camaro. More specifically: the 2018 Camaro SS with...

09/15/2025

The 10L series has seen substantial changes over the years. For instance, with the 10L1000 and those Gen. 2 units, there was a different clutch application, no latch valves and a few other new features.

Read our 10L1000 Casting Identification and Clutch Application guide here:

With the GM 10L1000 and those Gen. 2 units, there was a different clutch application, no latch valves and a few other new features.

09/12/2025

When the vehicle was checked for codes, the following DTCs were set:

P0756: Shift Solenoid “B” Performance
P0766: Shift Solenoid “D” Performance
P0868: Low Line Pressure”
P02701: Friction Element “B” Apply Time
P2703: Friction Element “B” Apply Time

Believe it or not, these codes are pointing to the cause of this transmission being stuck in Park.

For the rest of this story, read our article here:

Believe it or not, this laundry list of diagnostic codes are pointing to the cause of this 10R80 being stuck in Park.

09/11/2025

Transmission specialists, your expertise matters. Take the survey and tell us what Transmission Digest content you want more of:
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09/08/2025

Preview of coming attractions 🎬 : here's what you can expect in the next issue of Transmission Digest, in mailboxes soon!

09/04/2025

It's important to understand the possibilities and the limitations of generative AI, especially if we start to see it attempt to produce vehicle service information.

For more, read our column here:

It's important to understand the possibilities and the limitations of generative AI if it's going to start offering car service information.

09/02/2025

The latest entry in our monthly TASC Force Tips series, in partnership with Sonnax, is a guide on critical wear areas and vacuum test locations for the ZF 8HP50, ZF 8HP75, and Chrysler 850RE.

Take a look at the guide:

Sonnax has provided the following guide on critical wear areas and vacuum test locations for the ZF 8HP50, ZF 8HP75, and Chrysler 850RE.

08/28/2025

After a severe storm soaked its town, a 2006 Volvo S80 arrived at the local shop with a troubling list of symptoms: failure to start, erratic drivability, a whining noise, and enough dashboard warnings to light up Times Square. The customer mentioned that the car had sat in roughly seven inches of water—never a good omen for any modern vehicle. As with every car that rolls into our shop needing an evaluation, I grabbed my scan tool and documentation and headed out to begin the process.

Here's what the techs found:

After a severe storm soaked its town, a 2006 Volvo S80 arrived at the local shop with a strange set of Volvo diagnostic codes.

08/27/2025

Don't miss our August digital edition! It includes:

🚗 Code P1776: Why it appears and how to fix it (pg. 4);
🚗 Critical wear areas and vacuum test locations: ZF 8HP, Chrysler (pg. 8);
🚙 Finding the cause behind a strange set of diagnostic codes (pg. 14);
🚙 EVT Transmission Parts: Growing on the Move (pg. 18 and on the cover);
🚕 Servicing the Hyundai/Kia Dual Clutch Transmission (pg. 21); and
🚕 Company profiles for the upcoming fall trade show season (pg. 23).

Check it out here: https://bit.ly/4oZ8S90

08/25/2025

The Ram ProMaster using the 62TE transmission is known for a common issue with water damage throughout the engine compartment. This is due to the design of the vehicle.

Read more in Wayne Colonna's latest Technically Speaking column:

When the transmission was disassembled, it was obvious that there was water intrusion. But there was also glycol.