March 02, 2016
Whether you’re starting from scratch with a heavy-duty/performance build or optimizing a seasoned racing vehicle, key transmission areas MUST be addressed to realize the full potential of 4L60, 4L60-E, 4L65-E and 4L70-E units.
Check out these handy build guides to get maximum results out of your rebuild!
Quick upgrades for big performance without a big price tag.
Best parts for heavy-duty recalibration and durability.
Upgrades for performance recalibration and durability, no trans removal required. Most change in shift feel comes from the servos.
Heavy-duty parts and recalibration allow transmissions to endure power levels beyond what a stock transmission is built to handle.
The ultimate collection of 4L60/E upgrades for maximum strength, durability and quick shifts, including Smart-Tech® parts to ensure trannies stay out of the shop. When installed in a 4L65-E or 4L70-E, a Sonnax Level 3 build delivers a big power tranny that not only exceeds the capabilities of the 650 ft-lb 4L75-E, but is moving well into 4L80-E territory. For those on the fence about swapping transmissions, it's a great way to avoid the complications and inefficiencies of converting to a 4L80-E.
This video breaks down how to transform a 4L60-E, 4L65-E or 4L70-E into a top-tier performance transmission with Sonnax Level 3 build components.
These unique Sonnax valve bodies are optional upgrades that help protect against input sprag and Forward clutch failure in '96–'08 4L60-E and 4L65-E units.
Two Options: How to Choose? Which valve body to install depends on driving habits.
GM053-HD requires a manual downshift to D3 when performing a 4-3 downshift at cruising speed to achieve enhanced input sprag protection.
GM054-HD provides increased protection with the shifter in both D3 and OD without the need to manually downshift when performing a 4-3 downshift at cruising speed.
Duplicated Parts These valve bodies come pre-installed with some parts listed separately on these guides, so you will need to carefully spec out the rest of your build if you choose to use one of them. See product details for a more complete list of what's included with each valve body.
*Due to the overrun clutch being applied in additional ranges, some coast down clunks may be noticed. This can occur when slowing to a stop with the GM053-HD when driving in D3 range only and with the GM054-HD when driving in D3 or OD range.
March 02, 2016
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