Tejas SteelWorks Square Body GM LS Swap Guide Position The mounting position used in this outline is approximately three inches forward of "stock". This position was derived by mocking up the engine and transmission so that two objectives could be met: 1. retain the LS truck A/C compressor mounting on the lower right Get a solution for your Square-Body today. Clutch selection is the next critical step. If your manual transmission is equipped with a 10 spline input shaft. Modern Driveline will select one of our 26-spline, in-house, handmade clutches matched to your horsepower and use up to 600 Horsepower. Requires firewall modification to allow removal of #6 valve cover Need to bend the pinch weld where the tunnel meets the firewall for bell housing & exhaust clearance Crossmember under oil pan needs to be dropped 2 inches 5 and 6 speed manual transmissions don't fit without additional modifications AUTOMATIC TRANSMISSIONS It seems that 1973 - 1987 GM trucks are a common chassis to base your new creation on. Parts are readily available, and common, and don't forget cheap! Keep in mind that this information applies to any body swap involving putting a body on a chassis it was not originally manufactured for. 1. First and foremost, you want you new ride to be reliable. The DIY kit includes a few extra pieces including the same jig plate we use for welding the engine crossmember together. This kit is made from CNC plasma cut 1/4″ steel. DIY kit requires you clean the small amount of slag left over from the plasma table. 4 inch minimum suspension lift required to for front axle clearance. Engine & Transmission. Engine. 73-91 Squarebody LS Swap Kit. Sort By. Show. 73-91 Squarebody LS Swap Kit. Starting at $78.00. Add to Cart. Show. fury64. I was wondering if anyone on here has done a Cummins swap into an old Chevy. If so what kind of frame modifications were made to accommodate for the power. I'm wanting to do a 12v swap into my square body using the Tennessee Diesel Power crossmember and motor mount kit and I want the engine to make a fair amount of power (500-600hp). Based on the LS engine, this 6.0-liter truck engine was designed to bridge the gap between the new LS small-blocks and big-blocks for the truck applications. The major difference in the LQ4 engine is that they are cast iron instead of aluminum. Bolting a set of LS6 heads to the iron block, the LQ4 was born. Borgeson is now manufacturing all new, OEM Saginaw 525 series manual steering gears for the 1973-1987 2WD Chevy/GMC Squarebody Trucks in their Travelers Rest, South Carolina facility. This is a true OEM gear built to the original specifications and drawings from Saginaw, not an off-shore copy. These kits have mostly used modern Tremec manual gearboxes— TKO-series five-speeds (and now TKX) and T-56 /T-6060 six-speeds. But we were pleasantly surprised to learn of some newer kits aimed squarely at trucks like ours, even with four-wheel drive, using the Tremec TR-4050. From 1973-1987, the Square Body Chevy was one of the best-selling trucks in the industry. Learn how the Square Body evolved through its 14 years of production. A 6.3L 379 diesel became available with a 4-speed overdrive manual transmission. The inside of the trucks also received a refresh with a new instrument panel, seats, dash shape, and Complete chassis conversion kits for vintage pickup trucks. Find Out More. Knowledgeable & Experienced. We have served well over a thousand