This is the clutch pack assembly that's ready to be installed into its housing. Each assembly will have a different gear-reduction ratio that determines where on the transmission it will fit.This is the clutch pack assembly that's ready to be installed into its housing. Each assem On the track, however, the low 48 percent first gear should be enough to launch any powerful car hard, and the transmission's history of performance won't let anyone down. The biggest benefit to Pro Streeters is that you don't have to worry about overheating, flashing the torque converter or other maintenance costs-as there are none. The only exception is replacing the pressure plate and resurfacing the flywheel after a long period of use, and frequently changing the transmission fluid about every 400-500 miles. Although the initial cost is more than a well-built TH400, the longer durability and low-maintenance cost of the Lenco will pay for itself in the long run. Furthermore the Lenco allows you to achieve 3,000-rpm launches at the track and 1,000-rpm take-offs from the stoplight, depending on how long you leave your foot on the clutch. To demonstrate the inner workings of the Lenco ST-1200 transmission, we followed along as one was being assembled for use in Truckin' Magazine's World's Fastest Street Legal Pickup. Our sister publication is attempting to build an 8-second quarter-mile, '68 Chevy pickup which will also embark on a 450-plus mile trek from Los Angeles to Phoenix without any other changes. The truck runs a big-block Chevy that makes 1,100 horsepower on pump gas and lots of nitrous oxide. They opted to use the Lenco ST-1200 as it would be a great opportunity to show the tranny's durability and strength by running the truck on both the track and street. The sprag ring and sprag assembly are what keep the sun gear spinning in one direction until it is shifted.The sprag ring and sprag assembly are what keep the sun gear spinning in one direction unt The intermediate shaft is the connection to the other assemblies and is also made from hardened steel.The intermediate shaft is the connection to the other assemblies and is also made from har Part of the magic that allows the Lenco transmission to be shifted manually, is the radial plate. When the transmission's shift lever is moved the radial plate rotates and pushes against the pressure plate, actuating the clutch pack.Part of the magic that allows the Lenco transmission to be shifted manually, is the radial The ring is made from billet steel and sits over the entire planetary assembly. Shown is what a complete planetary gear assembly looks like in the housing. Note the hardened steel intermediate shaft that is on every assembly.Shown is what a complete planetary gear assembly looks like in the housing. Note the harde With the intermediate shaft in place, the sprag is installed between the shaft and sprag ring.With the intermediate shaft in place, the sprag is installed between the shaft and sprag r A sprag lock, washer, and cover are then installed over the assembly. The radial plate rides on this cam plate that pushes back against the pressure plate and clutch pack. Note the indentations in which the roller bearings of the radial plate ride in when it is not engaged.The radial plate rides on this cam plate that pushes back against the pressure plate and c Once everything is buttoned-up, the entire planetary assembly is bolted in place, behind other assemblies with different gear reduction ratios.Once everything is buttoned-up, the entire planetary assembly is bolted in place, behind o « | 1 | 2 | 3 | 4 | 5 | » | View Full Article By Dan Sanchez Enjoyed this Post? Subscribe to our RSS Feed, or use your favorite social media to recommend us to friends and colleagues!
