For example, when we boost line pressure within the unit, we tighten clearances and eliminate the potential for impact stress or impact shock." Follow along as we explore the beefcake internals that make the 700-R4 a truly world-class overdrive. I have been gently persuaded and strongly suggested that I swap out my freshly built 700R4 transmission BEFORE I grenade the tranny to a pile of useless. Most of the unit’s internal components are shared with the ’93-later 4L60-E, which was regularly improved/revised up through 2010.
#Built 700r4 transmission upgrade#
"By balancing every upgrade within the entire transmission, you never create a situation where any single component is stressed excessively. Introduced in 1982, the 4-speed Overdrive GM 700-R4 transmission also known as the 4L60 remains a popular option for street/strip performance applications. These transmissions are tough and built to handle whatever you dish out.
#Built 700r4 transmission pro#
"Since our inception, our approach to building transmissions has been to maintain balance," Pickering says. Description Pro Race Series (Level 2) 700R4 This Transmission has a Core Charge Our Pro Race Series transmission is the finest built street/race automatic transmission in the industry. Just like you wouldn't pair a set of cast pistons up with a big honkin' turbo, PerformaBuilt taps into its vast experience in rebuilding the 700-R4 to match up internal components that play nice with each other. Moreover, superior internals are just part of the equation. The same treatment is available for the 4L60E, 4L65E, and 4L80E automatics as well. It lists for $2,695, and is backed by a two-year warranty. PerformaBuilt's 700-R4 Level 3 transmission includes a modified five-pinion planetary, a heavy-duty input drum, steel pistons, Raybestos frictions and steels, a 29-element sprag assembly, a Beast sunshell, a carbon composite band, extreme-duty servos, a 13-vane pump, and a custom-built shift-improver kit.
The original unit was produced for use in 300hp vehicles, so you can see that this is quite an improvement." GM 4L60E transmissions are rated up to 450. Today we have a myriad of enhancements to choose from that enable us to produce a transmission that will hold up to 800 hp. GM 4L60E transmissions are rated up to 450 horsepower and 425 ft/lb torque, and can be custom built by Gearstar.
"GM continually upgraded and improved the unit, and aftermarket companies jumped on the bandwagon to develop a veritable plethora of replacement components to overcome the shortfalls of the original transmission. "Although the 700-R4 transmission wasn't well received at first, it turned out to be a solid design with a lot of potential," explains Alan Pickering of PerformaBuilt.
The same applies to the 700-R4 automatic. Nevertheless, incessant revisions to the cylinder head architecture and block casting technology of both platforms have enabled them to support massive horsepower and cubic inches. GM played this card to perfection with both the small- and big-block Chevy engines, neither of which had a clear on-paper edge over their contemporaries. Sometimes continually refining a design that's good enough trumps standing pat with an inherently superior product.
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