For our purposes, we’ll use a 26.5-inch-tall tire with a 4.11 rear gear ratio, and a goal of 2,600 cruising rpm. The ST1200 gives you the advantage of Lenco brute strength at a lesser price than our full race units. Drag Performance Calculator By AssassinRacing.com Calculate the theoretical 1/8 Mile ET, 1/4 Mile ET, 1/4 Mile Top End Speed, and Ideal 1/4 Mile Gear Ratio for a given application based on the Vehicle Weight (in pounds), Vehicle Horsepower (at the flywheel), RPM through lights (finish line), and Tire Diameter (Height) in Inches. The 4L80E’s 2.48, when multiplied to the rear axle ratio of 4.10:1, yields a close 10.16:1 – whereas the 4L60E’s gear ratios are harder to work with, even with another rear axle ratio like 3.73:1. At 500HP, the clutches in these units go out and at 700HP you WILL start hurting hard parts. In order to achieve an underdrive first gear launch ratio the LENCO transmission relys on planet gears which rotate around the sun gear. By the end of it, you will have a solid understanding of what goes into defining (and then selecting) the very best possible gear ratios for your racing car. 4-Speed $8,650 5-Speed $9,450. Jerico Drag Racing 4 Speed Revision 4 Transmission * Dog Rings and Sliders for Quick and Easy Shifting * Wide Variety of Gear Ratios Available * Stock and Super Stock Racing Applications * Aluminum Top Loader Case Aircraft Quality A206 * Caged Needle Thrust Bearings between Gears * … A simple flip of the gear lever on the side cover gives the driver the illusion of three normal speeds and a fourth that is overdrive. For our purposes, we’ll use a 26.5-inch-tall tire with a 4.11 rear gear ratio, and a goal of 2,600 cruising rpm. Gearing Your Transmission for the Strip. Our combined first gear ratio would be [3.36 x 2.52 = 8.46], not too bad for a 427 cubic inch engine with plenty of low rpm torque. Choices like this are available for … at a lesser price than our full race units. Standard gear ratio is the OEM 2.48/1.48. 1.48% ratio uses 22 tooth planet gears, a 40 tooth sun gear and an 83 tooth ring gear. The further you get away from 1:1 ( direct ) you in a sense get wider. transmissions, Featuring clutch to clutch shifting, it eliminated the one-way clutches used in earlier transmissions. Whether you have a power adder or just big cubic inches, we know this is … As an example, combining the TCI Six-speed’s 2.97:1 First gear with a 3.50:1 rear gear ratio is equal to a traditional TH-400 (or stock 4L80E) with a 4.19:1 rear gear. Planetary transmissions rely on a central sun gear to provide a 1:1 direct drive ratio once shifted from the launch ratio. 3/4" Gear Set. Our gearboxes can be found in a wide range of international classes, from GT racing right through to cross-country rallying. Whether you’re looking for a manual transmission as an OEM replacement part or looking to add a performance shifter to your speed machine, Summit Racing has all of the 2-, 4-, 5- and 6-speed manual trannys you need to keep charging to the front of the pack. Light weight components. For example, the default figures in the chart are for a stock ratio transmission as fitted to a Type 1, 1303S (3.88 ring and pinion). Using the T-10 design, the two speed has only two forward gears and reverse, making for less rotating weight, which equals more horsepower. That's a little higher than most people want their "cruising gear"!!! Nonetheless, a wide-ratio gearset can be used to provide a First gear ratio that is numerically larger. street transmission, It has appropriately two gears for a given speed. For example, a three speed requires two cases. RSG remans these transmissions for ZF and GM and are … By reducing the 6ths gear ratio you’ll let your car achieve a higher speed (and thus you will beat the computer). 6th gear of H pattern transmission has sequential system which creates the 5-speed sequential transmission with direct gear ratio of 5th gear. 2) 01-06 itr has the same 1-3 gear ratios as the 02-06 rsx-s, euro-r, and 06 si but has different 4-6 gear ratios. Final drive ratio is 1:1. These transmissions are assembled in ATI’s SFI case with an SFI Mopar specific bellhousing. Hours: Monday,Wednesday, Thursday 8:00-4:30 PM. Brek is right When I did my drag car I went with 4.56 with 9 x 28” M/T slicks car started with a 304 w/big cam & auto w/4000 stall. Leading provider of high performance automatic transmissions, torque converters and drivetrain components for race, street/strip, hot rod, street rod and towing TCI Gear Ratios JavaScript seems to be disabled in your browser. This type of transmission is very practical for drag races and drift driving; however, shifting to a final gear is usually a problem to achieve the maximum speed. Engineered for 1200 HP. All Rights Reserved. Shifters and lockouts can be either style. Calculate 1/8 mile ET,MPH and Ideal Gear Ratio using HP - by Wallace Racing Home of Pontiac Powered Firebirds,Trans Ams,Pontiac Powered Dragsters,Pontiac Power Rules! Strut-type synchronizers are provided for longer life and easier shifting. The appropriate flexplate, crank adapter and required bolts are also included so a standard GM converter with a small bolt circle drops right in. 8L90E TRANSMISSION FILTER - OEM REPLACEMENT, 6L80E 6L90E UPGRADE KIT - INLCUDES ALL PART #S BELOW, 6L80E / 6L90E 11 PCS BUSHING KIT - TEFLON COATED DURA BOND, 6L80E EXTENSION BUSHING - TEFLON COATED DURA BOND, 6L90E EXTENSION BUSHING - TEFLON COATED DURA BOND, 6L80E / 6L90E PUMP BUSHING - TEFLON COATED DURA BOND, HDXTREME™ CLUTCH & FRICTION KITS. This article digs into this. Nevertheless, affordable 6-speed options still exist. To stretch the gears in a RWD car such as the Ford GT, raise the final gear ratio to roughly 1.000 higher than the minimum, then slide the top speed slider all the way to the left, then proceed to move the final gear slider back to its minimum. The Lenco Racing ST1200 6 Speed Transmission has been specifically designed and engineered for severe duty street/strip applications. Stay up to date with news and promotions by signing up for our monthlly newsletter. Low drag (angluar contact and needle bearings). Gear & Transmission Calculators. As with all Lenco transmissions the ST1200 is a planetary design and comes with up to 6 forward speeds. Tags: Second gear ratio is 1.80 and third gear is a 1 .31 ratio. 8620 is a premium quality material that will provide excellent service for 1200 HP hot rods. With that in mind G-force manufactures a 6-Speed upgrade kit available for any T-56 variation. Manual Transmission Gear Ratio Charts for GM/Chevy Vehicles Posted by OnAllCylinders Staff on October 27, 2017 at 12:44 pm Gear ratio affects a variety of driveline combinations, so it’s important to know what the gear ratios are for a gearbox you might be swapping into your ride. A simple flip of the gear lever on the side cover gives the driver the illusion of three normal speeds and a fourth that is overdrive. 195/55 x 15 = 24.44 inch tyre diameter. Lenco celebrates over forty-five years of the engineering and manufacturing of the most successful drag racing transmissions ever built. The middle case would also contain a 1.37 planet gear set. 1.44% ratio uses 22 tooth planet gears, a 35 tooth sun gear and a 79 tooth ring gear.