After that me w/a jerico, then after that Dave Baker (dart into the 8s) w/gforce 5speed. One of the secrets to Drag Week victory is running a Gear Vendors overdrive behind the transmission. About 1/2 way through you see a duster with an 833 (but has broken it a few times that I know of), but still good. Drag Slash: All-New Pro-Series Magnum 272R High-Performance Transmission FEATURES: Hardened steel input shaft with press-fit top gear Tunable sealed. The fastest UMTR car (Roger Blile) runs a liberty equalizer, but just about all of the transmissions are used in this vid. First pull the car into the water, with a 3 speed transmission, put the car in 2nd gear, get the tires spinning then shift. Doing so Will cause serous damage to Engine and Transmission. However, when dyno testing in the direct drive (1:1) gear, power is delivered directly through the main shaft of the transmission, so the only loss sources are windage, friction and drag. Its interesting to see how quick each of them shift (if you can put up with the music). You are trying to set the pinion angle to be parallel with the centerline of the engine & transmission on hard acceleration. Not a big difference but compounded through whatever the rear gear ratio is, it does make a very slight difference. Cheap and commonly available, easy to fit in most cars. Its my understanding that the lenco is the strongest.Īll in car. Very slightly lower 1st and 2nd gear ratio. I have friends running jerico, gforce 4 and 5 speeds, lencos, and liberty equalizers and I haven't heard anyone complain about any of them. If going with a jerico, then I'd suggest the dr4 Revision 4 which I think the only version that they sell now (stronger case, wider gears). ![]() I've heard that the gforce 4spd shifts quicker. The average price of a transmission repair and replacement can vary depending on location. You can up your chance of wining by having the ability to change gear ratios.I can't tell you what's best, but my jerico has well over a thousand passes and I bought used from a fellow running deep nines in a cough, cough fairlane. This is made to Mark Williams’ specs by Torco (the highly respected lubricant manufacturer that’s been in business since 1950) and has proven to work great under the most rigorous racing conditions. As a final touch, M-W includes a specially formulated gear lube with each Thirdmember. Multiply that by the available gear ratios and there’s quite a selection. There are a dozen or so different combinations of carriers and spools (or Posi units). Mark Williams Enterprises endeavors to make things easier for racers by offering compete ready-to-use thirdmembers that have been set up by experienced technicians. And how does that relate to your engine’s power curve? There are many important questions that can be answered by the M-W calculator. When you’re in high gear (assuming it is 1:1) approaching the lights the lower gear will obviously be eating up more RPM. Will the track hold it? Can it take more? To be able to withstand the enormous torque forces, every automatic gearbox has to have a high-performance clutch system fitted. Change the rear end gears to a 4.29 and the torque ramps up to3,903 ft. For example, a 1.82 low gear Powerglide mated to a 4:11 rear end would multiply the base torque to 3,740 ft. ![]() At the hit, you’ve got a transmission gear as a multiplier and also the ring & pinion. Let’s take a hypothetical engine with 500 ft. But if you are having trouble in your drag racing car with failed parts or inconsistent performance, a few adjustments to your setup can make the difference between a broken car and a winning car. Get your tranny in full manual, automatic/manual, or. That includes popular transmission types such as Powerglide, TH350, TH400, C-4, C-6, 700R4, 4L80E, AOD, E4OD, Torqueflite 727, and more. Racing heavily stresses the transmission and causes it to heat very rapidly. No matter what you drivestreet machine, drag race or oval track car, tractor puller, or whateverwe’ve got an automatic transmission for you. With this info in hand along with the tire size being used and the speed you are looking to run, MW can pinpoint the gear ratio.Īs the rear end gear is a multiplier of torque relative to what’s delivered to the rear wheels, some interesting calculations can come into play. Excessive heat kills transmission and torque converter components. If the RPM is too high and goes past peak power, acceleration will drop off so knowing your peak horsepower and the RPM where it happens is critical. Ideally you want your engine RPM at the finish line to be somewhere close to the point of peak power. Probably the most important of the three variables required to calculate the gear ratio is engine RPM. ![]() Although gear ratios will vary with each application and the altitude of the race track, the key to optimizing the ring and pinion ratio is knowing what your engine is capable of.
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