John, put a pressure guage at the shifter pod. 1.566%Uses 18 tooth planet gears, a 45 tooth sun gear and an 81 tooth ring gear. You can expand to 3 or 4 speeds by addition of additional cases. We got to ride along in an ST1200 equipped car, and what a monster of a car it was. This intermediate shaft connects this planetary gear set to subsequent planetary gear sets which make up the modular nature of this transmission. This is a 1971-72 901 transmission converted for use as a side shift 914 gearbox. 1.21%Uses 21/31 tooth planet gears, a 24 tooth sun gear and a 76 tooth ring gear. Pistol Grip Manual Shifter. This change reduced any chance of casting imperfections and it offered more control over the final product. View the whole process and start at the beginning. The CS2 ,CS3, and CS4 LENCO racing transmission is a smaller, lighter and more compact version of our CS1 Standard Design. 1.356%Uses 23 tooth planet gears, a 26 tooth sun gear and a 73 tooth ring gear. Magnesium case is standard. The ST1200 is the same engineering design as the all-out-race New Generation CS2 but with a couple of minor differences. Other refinements are O-ring seals that replaced the the gasket seals between the transmission casings. 1.20%Uses 22/32 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear. A five speed requires four cases, and a six speed requires five cases. The final section is the reverser. The original ST1200 came with a cast aluminum case, gasket seals, and a range of selectable gear ratios. transmissions, 1.405%Uses 23 tooth planet gears, a 32 tooth sun gear and an 79 tooth ring gear. This is our double large sprag assembly and is used primarily in the boat applications, but has found its way into some car applications. 2 Speed + reverser with Std output: 17.500". The Lencodrive does not require a containment blanket unless you use a supercharger or alternative fuels. 1.356% Uses 23 tooth planet gears, a 26 tooth sun gear and a 73 tooth ring gear. For more specific information on any of these Lenco transmissions please refer to the Tabs below, or call our tech line at(909) 673-9080. Clutchless shifting is the practice of changing or shifting your gear without touching the left bar lever. You must multiply each cases underdrive ratio in order to determine the first gear ratio. Likes Received: 180. They only serve to transfer the power of the ring gear to the planetary and to rotate around the sun gear if the sun gear is held stationary by the sprag clutch. The ST1200 is available with all popularbellhousing patterns - Ford, GM, MoPar and our own five-bolt design. I've mounted it where It's most comfortable for me. 1.41% Uses 23 tooth planet gears, a 32 tooth sun gear and a 79 tooth ring gear. (2) it is easier to work on the bruno/lenco . If you have a car that you drive to the store on Monday and to the drag strip on Sunday, the only hard question that you have to ask yourself is: Do you prefer anodized or clear? . With the extensive number of ratios we offer it is possible to choose from over 7,000 first gear combinations in the case of a four-speed for example. Each lever controls one planetary gear set. Burnout's (on all LENCOS): When the transmission is shifted a clutch pack compresses the rotating sun gear assembly to the direct drive central sun gear. Second gear ratio is 1.80 and third gear is a 1.31 ratio. 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. Chevy Pilot Bearing Assembly 1955-2000 Chevrolet (SB & BB), and Lenco transmissions. Here's some fuzzy footage showing the operation. Please call for ordering or technical information. Lenco celebrates over forty-five years of the engineering and manufacturing of the most successful drag racing transmissions ever built. The ST1200 transmission is pure Lenco through and through and is ideally suited for nitrous, blown, injected and carbureted engines producing up to 1200 HP and 900 lb ft of torque. Competition Eliminator, Super classes, Top Dragster and Pro Stock cars are typical classes where you will find the New Generation LENCO. Before you install the transmission you must measure the clearance between the pilot bearing end of the input shaft and the rear face of the pilot bearing. The gearset in the third case alone, 1.31:1, determines the third gear ratio. All Lencodrives come with the following (less converter). Air servos are machined from billet alum. With its larger size and more teeth, it rotates faster, so it spins the output shaft faster, which in turn spins the rear wheels faster. Now rotate tower clockwise until it lightly touches pin on shift fork then rotate tower counter clockwise 2 turns and place hook of scale in top hole of checking lever supplied with transmission (this lever should be about 5 1/2" over all length) and pull scale slowly to shift section, taking note of highest reading this is your shift pressure. 1.22% Uses compound 21 and 30 tooth planet gears, a 24 tooth sun gear and a 75 tooth ring gear. Air or lever shift. The Lencodrive comes as a 2 speed with reverse. The air servo is attached to a rotary shift plate by an adjustable arm which is pre-set by the factory and should NOT be changed. Air or Lever Shift. Run air servo jam nut and o-ring down against the case and tighten with a 1 1/2" wrench. The ST-1200 is not one of their most popular transmissions (they still sell more racing models), but it is the answer to many problems facing high-horsepower street cars and trucks that need a compromise between a stout race and street transmission. Despite its reputation among racers and its many uses today, which include everything from boats to alcohol dragsters, many enthusiasts have not caught on to the fact that there IS a street version available. Checking Shift Pressure(only on CS-1 style or center shift transmissions): To measure the shift pressure install checking lever into tower screw jam nut all the way up the tower so it's out of the way. If you already have a ST1200, you can upgrade your transmission with the new parts, ratios, and even new casing as all of the new upgraded components are compatible with the older units. There are two different size air servos for the New Generation transmissions. Screw air servo counter-clockwise about five or six turns before you reassemble the transmission. The middle case would also contain a 1.37 planet gear set. 1.48% ratio uses 22 tooth planet gears, a 40 tooth sun gear and an 83 tooth ring gear. A five speed requires four cases, and a six speed requires five cases. We acheive more than two speeds by combining multiple cases. View the whole process and start at the beginning. Gear ratios are selected using a mathematical calculation that considers both the number of speeds required, horsepower of the car, and final rearend drive ratio. 1.35% Uses 26 tooth planet gears, a 28 tooth sun gear and a 80 tooth ring gear. 3/4" Gear Set. 1.338%Uses 24 tooth planet gears, a 25 tooth sun gear and a 74 tooth ring gear. Air or manual shift. Lenco, the all time champion and undisputed leader in the drag racing transmissions. Shifters and lockouts can be either style. The tallest to the right is used to shift the transmission from first to second gear. In all instances the transmission is then shifted to a 1:1 direct drive ratio by depression As with the CS1 Standard Design, the New Generation CS2, CS3 and CS4 can be shifted by lever or our CO2 system. 1.28% Uses 32 tooth planet gear, a 25 tooth sun gear and an 89 tooth ring gear. Purpose designed and produced for drag, ski and river boat requirements. Multiply the two rear case gearset ratios to determine the second gear ratio of 1.80:1. Since the 30 wt oil is thicker it takes a . It is bolted to the end of the transmission with a splined output shaft which will await the driveshaft yoke. The internal action of a LENCO is such that when the transmission is in first gear the chosen planet gear assembly provides the launch ratio. 1.22% (1.219) - Uses 30/35 tooth planet gears, a 23 tooth sun gear and a 90 tooth ring gear. All transmissions work by using gear ratios to transfer power to the rear wheels. e30 m52 turbo. Apply a small amount of Red (271) Locktite on the set screw. It makes a powerful and unique street transmission that offers Hot Rodders a gearbox that can handle up to 1200 horsepower reliably, while offering versatility to seamlessly change between an easy drive on the streets to racing hard on the weekend. 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. Small Sprag Assembly -This is a our small Sprag, note the snap ring in the outer race and single brass thrust washer. Typically the CS-1 and CS-3 run the 2.50" piston air servo (150 psi) and the CS-2 and Lenco drive runs the 3.00" piston (250 psi). Each case in succession, with its particular underdrive ratio, determines the immediate drive ratio. 1.438% Uses 20 tooth planet gears, a 32 tooth sun gear and a 73 tooth ring gear. 1.19%Uses 21/33 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear. Also known as a 'crash' gearbox for the noise it can make with a mis-timed shift, the non-synchromesh transmission is now only usually found in some trucks. In all instances you will require a LENCO reverse unit to achieve reverse movement. Glazed, burned and chipped discs must also be replaced immediately. Once all cases have been shifted the entire transmission assembly is locked in the final 1:1 direct drive ratio. The rear case a 1.31 ratio gearset. Th.. 1.22%Uses 21/30 tooth planet gears, a 24 tooth sun gear and a 75 tooth ring gear. 1.25% - Uses 34 tooth planet gears, a 23 tooth sun gear and a 91 tooth ring gear. In the example of a four speed, the case nearest the engine would 1.16%Uses 21/36 tooth planet gears, a 22 tooth sun gear and a 79 tooth ring gear. Air shifted LENCOS come pre adjusted from the factory. Throwout bearing collar (4 & 5-speed only). You can expand to 3 or 4 speeds by addition of additional cases. The simplicity also makes them easy to repair if something goes wrong . The arm is held into the servo piston by a set screw. Lenco Racing, the all time champion and undisputed leader in the drag racing. 1.73% Uses 14 tooth planet gears, a 76 tooth sun gear and a 104 tooth ring gear. 1.405% Uses 23 tooth planet gears, a 32 tooth sun gear and an 79 tooth ring gear. The CS1 will control up to 3000 HP. Copyright 2020, Lenco Racing. This action compresses an internal clutch pack which results in a final driveratio of 1:1. It has special attachments to help it react quicker between the locked and the overrun position thus extending its service life. Run the air servo jam nut and o-ring up the threads on the servo. The hard-anodized finish is meant to thrive in that environment, requiring no more than a quick wipe down with a damp rag, whereas the bare aluminum transmission would need more work to get it sparkling again. Multiple speed transmissions use multiplication of gears to create different speeds. 1.21%Uses 21/31 tooth planet gears, a 24 tooth sun gear and a 76 tooth ring gear. The shift lever is almost the same height as the standard 5th gear lever. Once all cases have been shifted the entire transmission assembly is locked in the final 1:1 direct drive ratio. Since each case contains one gearset and provides both underdrive and direct drive,multiple cases (gearsets) provide multiple underdrive ratios. Due to the way they are designed and operate, the advantages are clear. On the street five-speed model the ratios start at 3.25 in first gear, 2.26 in second, 1.64 in third, 1.25 in fourth, and fifth gear is 1:1. Building a Lenco ST1200 starts with constructing the soul of the transmission: assembling its planetary gear sets. You can add additional cases and gearsets that will result in 3 or 4 speeds. Planetary transmissions rely on a central sun gear to provide a 1:1 direct drive ratio once shifted from the launch ratio. In order to achieve an underdrive first gear launch ratio the LENCO transmission relies on planet gears which rotate around the sun gear. As with all LENCO transmissions a separate reverse unit is employed. Lenco Racing Transmissions have brought more of their racing technology to the street crowd with a new transmission that is lighter, engineered with new technology, has more efficient components, and has less rotating mass than the previous unit. This is a very extreme duty sprag assembly. 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 rear axle is a Dana 44 with independent half-shafts. Copyright 2020, Lenco Racing. The ST1200 gives you the advantage of Lenco brute strengthat a lesser price than our full race units. 1.38%Uses 23 tooth planet gears, a 28 tooth sun gear and a 74 tooth ring gear. The Lenco Racinggear reduction unit, when used in conjunction with our CS1, CS2, CS3, or CS4 t.. Lenco Racingmachines our input shafts from 300M and Marage stock. I shift it with a timed switch getting its signal from an electric shifter box so that it applies voltage for 17 sec at the shift. Lenco celebrates over forty-five years of the engineering and manufacturing of the most successful drag racing transmissions ever built. LENCO transmissions are shipped with the shift levers removed in order to prevent damage during shipping. 1.28% Uses 32 tooth planet gear, a 25 tooth sun gear and an 89 tooth ring gear. This is first gear. Aside from manufacturing benefits, it also gives customers a finished piece that looks more like jewelry than an automotive part. Since internal combustion engines have a short torque band, we utilize transmissions to change the speed that the wheels spin by either using larger or shorter gear ratios. Large Sprag Assembly -This is our large sprag and unlike the small sprag doesn't have a snap ring in the outer race and has two brass thrust washers. 1.31%Uses 27 tooth planet gears, a 25 tooth sun gear and a 80 tooth ring gear. Warning: Do Not over tighten set screw. Those two speeds are (1) the lower underdrive ratio and (2) the direct 1:1 final lock-up drive ratio. Jeff Turner's street driven 600hp on motor/800hp on a 200-shot of nitrous "race for money" license platted 1966 Pontiac GTO took us for a spin. 1.41% Uses 23 tooth planet gears, a 32 tooth sun gear and a 79 tooth ring gear. Then, continue to screw air servo Out (counter-clockwise) one half turn. It is not necessary for the driver to disengage the clutch when shifting from ratio to ratio. Sight through plug hole, where you will see the outer edge of the rotary shift plate. A perfect replacement for expensive breakage prone Powerglides, Turbos, C4, C6 style and Torqueflite transmissions the LENCODRIVE is 100% LENCO and will handle 2500 HP with ease. 1.41%Uses 23 tooth planet gears, a 32 tooth sun gear and an 79 tooth ring gear. In general, all LENCO transmissions are a planetary design. First, the top loader has three levers on the drivers side of the case, 1 is for 1st and 2nd gear, the next is for reverse, and the third is for 3rd and 4th gear. INSTALLATION Lenco transmissions were first made popular in the early '70s when NHRA Pro Stockers needed a gearbox that was up to the task of 9-second elapsed times. 1.68% Uses 15 tooth planet gears, a 62 tooth sun gear and a 91 tooth ring gear. 1.48% ratio uses 22 tooth planet gears, a 40 tooth sun gear and an 83 tooth ring gear. 1.68% - Uses 15 tooth planet gears, a 62 tooth sun gear and a 91 tooth ring gear. For additional information about Lenco products please email us here, or call us at (909) 673-9080. 1.338% Uses 24 tooth planet gears, a 25 tooth sun gear and a 74 tooth ring gear. Changing gears and setting it up is the same for the CS-2 and the Lencodrive. You will need to add a LENCO reverse unit in order to back up. 1.44% ratio uses 22 tooth planet gears, a 35 tooth sun gear and a 79 tooth ring gear. Engineered to handle 3500+ HP the Standard Design LENCO is available with up to 5 speeds and comes in a cast magnesium case. Please click here for CS3 Timing Chart (.pdf). Also, a hp/tq rating on a transmission does not mean it will actually hold that much. The Lenco is basically a planetary transmission where each gear has its own housing and its own shift lever. Final drive ratio is 1:1. Going to high on the pressure shocks the transmission and drive-train. Planetary gear sets have two speeds. 1.313%Uses 27 tooth planet gears, a 25 tooth sun gear and an 80 tooth ring gear. 1.37% - Uses 26 tooth planet gears, a 31 tooth sun gear and a 83 tooth ring gear. transmission, Ourblue,greenandtandisc are supplied new at approximately .058"- .061" thickness. Lever or CO2 shift. To address this, Lenco added more gear ratios, particularly ratios which were half-steps to fill in the gaps so that a customer could fine tune their system without the pesky large leap that used to happen. contain a 1.37 ratio planet gear set. I use an electric over air setup to shift my new B and J transmission. This unique clutch is a very popular replacement for clunky V-drive dog style in-out boxes. This transmission can be used to drive your hot rod to work Monday through Friday and then to the dragstrip and the winner's circle on weekends. A large ring gear surrounds the entire solar system of gears. CS2, CS3, CS4 & Lencodrive or offset shift transmissions: CS1 Standard Design 5.6K views, 84 likes, 1 loves, 13 comments, 17 shares, Facebook Watch Videos from Lenco Racing Transmissions, Inc.: David answers a few FAQ on CS-1 thru CS-4 Transmissions
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