![]() ![]() When we say that this kit is everything you need to make the change, we mean everything. Keisler Engineering realized this, and produced the Perfect Fit Kit, which changes the process from a one-off custom swap job into something easily accomplished by any home mechanic. Thanks to it’s overdrive gear, we can also get the off-the-line performance we want with a low (numerically high) final drive ratio while keeping good fuel economy on the freeway.īut while the TKO is a great transmission, it was not designed to be bolted under the floor of an older musclecar like our Nova. Rated at 600 horsepower and 600 foot pounds of torque capacity, this gearbox would be capable of living happily with the power of the LS engine even if we decide to make some performance upgrades later. To that end, we knew we wanted to back our LS with a Tremec Transmissions TKO-600. This 480 horse Gen IV small block is going to provide all the power we want for this street/pro touring Nova, but to properly harness it we need an appropriately modern transmission to match. The powerplant selected for this project is a GM Performance Parts LS376/480 crate engine. The Nova in question is a non-console car that has been completely stripped down, ready for the installation of a modern drivetrain. Fortunately, that’s no longer the case, and to prove it we installed a brand-new TKO behind the fresh GM LS crate motor in our Project Swinger ’71 Nova using the Keisler Engineering Perfect Fit Kit, a ‘transmission swap in a box’ that makes it almost easy. In the recent past, doing that kind of a swap could be an exercise in frustration, though matching block to bellhousing, tunnel to trans, and crossmember to frame and exhaust took patience and more than a little fabrication skill. Going from a tired factory automatic or three-speed stick to an up-to-date five- or six-speed overdrive transmission totally changes the character of any classic for the better. ![]() As modern engine swaps into classic musclecars become more and more popular, so does swapping in newer transmissions to match. ![]()
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