Allison 1000 Archives - Transmission Digest
Allison 1000 geartrain bind-up

When the torque converter housing is bolted to the transmission case in an Allison 1000, the geartrain is locked and will not rotate.

Georend introduces Allison 1000 steel flexplate

Georend has introduced a new high-strength steel flexplate for the Allison 1000 transmission. This flexplate fits any 2001 and later Allison 1000 or Allison 10L1000 model with a Duramax engine. According to the company, features of this flexplate include: 50% thicker than OE. Manufactured by metal spinning process for a more durable product. No applied

Transtar highlights cooler flow bypass kit for GM, Allison

Transtar highlights the TransGo cooler flow bypass kit for GM 6L80, 6L90, 8L45 and 8L90 models as well as Allison 1000 transmissions. Years covered range from 2014 to 2022. According to the company, features of this kit include: Provides all-time cooler flow regardless of temperature; Prevents overheating; Reduces transmission fluid temperature; Eliminates thermostatic assembly; Allows

Allison 1000/2000 Series Slipping on Initial Forward Take-Off

With nothing found in the transmission that could be blamed for the slip complaint, the valve body was disassembled for inspection.

Allison 1000/2000/2400, 2000 – 2015

Subject Matter: Allison 1000/2000/2400

Critical Wear Areas & Vacuum Test Locations

Identifying Allison 1000/2000/2400 Valve Bodies

Over the years, the Allison® 1000/2000/2400 valve body has had four versions. This article is written to help identify each version. The first two versions are five-speed and the last two are six-speed valve bodies. The information will explain casting number and separator-plate combinations that work correctly together.

As a Tech, You Must Detect

Occasionally you will have a vehicle come into your shop that takes you down a different path than what you might have expected. The following account tells the story of one of the times that it happened to me. The star of this show is a 2006 Chevrolet Silverado 2500 4×4, equipped with a Duramax diesel engine and an Allison 1000 transmission.

Al Turner

The Technically Speaking article in the June issue of Transmission Digest was an article called A Twist of Fate. The subject matter was the effects produced when an AS68RC transmission’s stator shaft turns in the pump cover. The article briefly mentioned a similar issue with the Allison 1000/2000 transmission. This comment prompted several people to call asking for more information about it.

Allison 1000/2000: TCC Cycling or Surge

In ATSG’s “Shifting Great in 2008” technical-training seminar we covered a complaint of TCC shuttle or surge with GM’s medium-duty trucks using Allison 1000/2000-series transmissions. This complaint usually occurs after converter replacement.

Allison 1000 Converters – the Next Generation

The Allison 1000 converter has evolved considerably throughout its existence. By the end of the 2007 model year there had been five different generations of this converter. The chart in Figure 1 lists the part name, stall torque ratio, part number and color ID code for the first five generations of this converter (Transmission Digest, November 2007, page 47).

Which Generation of Torque Converter?

Since the release of the Allison 1000/2000/2400 series transmission, four basic torque-converter configurations have been used. TC-210, TC-211, TC-221 and TC-222 can be found in Group 21 of the Allison Parts Book, and these four converters all have different stall torque ratios and “K” factors. Over the years several revisions have been made to the torque-converter assembly process for all four converters, and each time a change was made, a new part number was assigned. None of these changes had an effect on the performance or functionality of the torque converter. Different generations of each of the four converters are completely interchangeable with other generations of the same type.

Lockup Surge in Allison 1000s

Have you ever found yourself chasing a “phantom” TCC drivability problem in a GM vehicle that uses the Allison 1000/2000/2400 series of transmissions?

If you have, there’s a good chance that the root of your problem turned out to be the torque converter. No earth-shattering news there, but what is unique is that the problem was likely on the outside of the converter, not the inside.