2017 Trailblazer Engine Manual
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According to some (possibly dubious) online sources, the Aisin 5-speed manual transmission out of the Pontiac Solstice and Chevy Colorado— which came with four- and five-cylinder cousins of the Vortec 4200, respectively— can be bolted to the, but its innards would be annihilated like pretzel sticks in a garbage disposal by the big motor's torque (especially when I add turbocharging, which I plan to do). So, the ol' adapter-and-custom-flywheel approach would be needed; this involves lots of fabrication but opens up a whole universe of transmission options. Wanting something not too rare/expensive, I considered using a or a, but then a ZF 'Black Tag' 6-speed from a appeared on Craigslist not far from me and for a reasonable price, and I went ahead and bought it. Because a project of this magnitude requires the skills of someone who can do things I'm not so good at— say, do math or work a lathe— I've commissioned to build this car. Rich is that rare combination of real engineer and old-timey hot-rodder, who can listen to this sort of terrible idea— hey, how about an ancient Mopar sedan with GM truck engine and Toyota Soarer suspension?— and find a way to make it happen with not-insanely-expensive hardware. So, the first thing he did after he had the ZF transmission on hand was to pick up a much-abused at a circle-track swap meet. Of course, wrestling a complete truck engine around the garage when you're trying to test-fit a modified bellhousing is a nightmare, so Rich found this cheap Vortec 4200 bare block.
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Mockups of engine mounting have also been a lot easier, thanks to this block being on hand. A couple of the locating dowels on the Vortec 4200 engine block are in the same locations as those on the small-block Chevy engine, so that provided a bit of a starting point for the modifications to the. But there's no point in having a transmission that bolts to the engine if you don't have the stuff that goes between them, so we had to resolve the flywheel and clutch dilemmas. Rich spent many hours searching online sources to find a clutch disc/pressure-plate combination that would mesh with all the variables already in place, and the frustration level kept building and building. He dug through heaps of old parts, asked around, and couldn't get an answer. Finally, he dropped in on an old-fashioned transmission shop in Denver, where they have an honest-to-god parts man behind the counter, and this guy came up with the correct solution in about five minutes.
1960s GM 11' clutch disc, 1970s fine-spline Chrysler 11' pressure plate (the Chrysler pressure plate has a more compact design that fits the custom flywheel). Add a swap-meet hydraulic throwout bearing, a GM LS1 pilot bearing, and, and all the necessary bits and pieces are accounted for. Then it was just a matter of modifying the Lakewood bellhousing to fit everything. This was much, much easier said than done; Rich says if he had to do it over again he'd just make a wood form and have some bellhousings sand-cast. This part of the job took weeks and was maddeningly frustrating.
I'll let Rich describe the whole transmission-engine mating sequence in his own words:. Stare at the the LL8 bell, decide that a 3' thick flywheel isn't a good idea. Stare at stock GM SBC bells of various configurations, decide that hacking and welding an unknown aluminum alloy is a bad idea.
Adapter plate gets back to the thick custom flywheel. Think about building a wood form and have a couple sand cast. DIY sand cast bells won't come close to pleasing a race inspector expecting an SFI tag. Contact Lakewood, they don't make one, won't sell an unmachined blank. Call and a couple others, they'll make a flywheel for a zillion dollars. Bonneville guy comes through. Source a Colorado 5cyl flywheel for the ring gear, transfer.
Chevy Trailblazer Engine
Design around this flywheel. Spend lots of time surfing, etc. Trying to source the right combo of parts.
Walk into an old school shop (Clutch Exchange) and have a solution in about five minutes. Decide to hack up a used Lakewood bell, add flanges and ears, hope to minimize the warping.
Do so, maximize the warping. Spend a bunch of time on the milling machine, spend a bunch of time measuring on the engine, resist urge to throw it away.
2017 Trailblazer Specs
Drill out the indexes, machine new ones, weld in place in situ. Make an adapter ring for the ZF index (it's unique). Slop some red paint on it.