Peek Inside The Legendary Allison 1000 Transmission: Video
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If there’s a name that General Motors truck buyers trust, its Allison.
The Indianapolis-based engineering firm, which was once a owned by GM, introduced its 1000-series transmission in 1999, which has since been used in Duramax diesel powered versions of both the Chevrolet Silverado HD and GMC Sierra HD.
While these transmissions are robust and fairly reliable, they have a ton of moving parts, so something is bound to go wrong in them eventually. That’s where Kodiak Truck in North Prarie, Wisconsin steps in – a diesel truck shop that specializes in rebuilding these wildly complicated five- and six-speed automatics, among other things.
YouTuber Truck Master recently paid a visit to Kodiak Truck, which he hired to rebuild his six-speed Allison 1000 transmission for his Duramax diesel Chevrolet Silverado HD. Truck Master had previously paid to have the transmission rebuilt and to have a different clutch pack and other upgrade parts installed in order to help it handle more torque, but after experiencing issues with it, he knew he needed to take it in to see the professionals at Kodiak.
This video provides a fascinating look at how a professional dismantles an Allison 1000, diagnoses its issues and replaces the necessary parts. It’s also interesting to see him precisely measure the clearances within the transmission as he goes along – obviously a crucial part to ensuring it works as designed.
If you’re a diesel truck fan and want more insight into how the professionals service a high-quality heavy duty transmission like the Allison 1000, you definitely won’t want to miss the video embedded above.
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Source: Truck Master on YouTube
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So sad to see GM not even OFFER the tried and true trans in the new HD’s.
Its the equivalent to RAM dropping Cummins. Sure the new trans MIGHT be as good in terms of reliability, durability and performance…..but does anyone really want to put up 40k and find out??
Should have had Xcalliber build this trans, would have included all the gear train updates.
I’m a regular watcher of “Truck Master”‘s channel on YouTube. This article fails to mention that he had already had another company instal aftermarket, so-called high performance parts and it’s those parts that failed. The builder in this video brought a lot of components back to stock because they work so well and are indeed durable. Truck master is extremely hard on his truck as so many are that play in the aftermarket tuner game. Leave it stock and with normal maintenance it’ll last a long, long time. This article is quite misleading.