![]() This gear will give you 11% more torque multiplication and the right rpm when you want instead of the torque converter locking and unlocking repeatedly or lugging the engine. The GEAR VENDORS also gives you an important towing or performance overdrive gear that is between the tall factory overdrive ratio (4th) and Drive (3rd). of torque are easily achieved just by having the close ratios when you need them. Because of these wide factory ratios there is no better example of the difference that can be made with adding a Gear Vendors. The GEAR VENDORS will give you Gear-Splitting to fix those wide ratios with a gear between each of them for tremendous gains in performance. If you try to lock down the clutches without computerized torque management you break the transmission – there is jut no way to work well with stock ratios that are equivalent to skipping a gear (going from 1st to 3rd – skipping 2nd in an M21 manual is only 41%). The vehicle cannot simply increase its vehicle speed 47% (the ratio split of the 1-2 shift) without pulling the motor rpm down a huge amount.Thus the more power you feed the 4L60 the more it converts to heat in its clutches and torque convertor. The intention of the designers (a low starting gear and tall overdrive) was the best possible EPA ratings, which the trans does well but these wide ratios are a big compromise to performance and durability.Įven if you use forced induction (supercharging) on a 4L60 trans equipped vehicle it is hard to overcome the wide ratios. YOKE, T3R-3-9762HP, GM, TH400, 4L80E, MUNCIE, M20, M21, M22 (This part has been discontinued) $ 150.There are two basic GM 4-Speed automatics: The light duty 700R4/4L60E found mainly in half ton and car applications, and the heavy duty 4L80E in the heavier applications.ħ00R4/4L60E’s have a low 3.06 first gear which is good for initial take off but this makes the transmission have the widest ratio changes of all popular makes and is the route of all the 4L60’s reliability and performance issues.Unless driven gears with more than 45 teeth and / or drive gears with fewer than 15 teeth become available, it will be impossible without using a ratio adapter to have an accurate speedometer with rear end gear ratios lower (higher numerically) than 4.10:1, unless 27 inch or larger tires are installed.Ĥ5 will work, but will read about 3 MPH fast at 50 MPH. The number on the driven gear housing must match the number of teeth on the driven gear. Twelve speedometer driven gears are available for the 700R4 / 4L60 transmissions to calibrate the speedometer with various axle ratios and tire diameters. Your speedometer may or may not show a number. These numbers are the number of revolutions the speedometer cable must turn in one mile of travel. Look at the bottom of the speedometer face for the numbers 940, 960, 1000, or 1020. There are two driven gear housings, one for 34 through 39 tooth driven gears and one for 40 through 45 tooth driven gears. Most cars and trucks with low rear end ratios will take a 15 tooth drive gear. The following speedometer drive gears and driven gears are available for the 700R4 / 4L60 transmissions. Variables such as the vehicle’s axle ratio and tire diameter affect the accuracy of the speedometer. To determine your rear end ratio, raise both tires off of the ground, turn both tires at the same time one complete turn, at the same time count the turns of the drive shaft, this is your ratio. The actual run out of the tire can be as much as 2 to 3 inches less than what the circumference of the tire measures. To determine your tires true diameter in relation to determining what speedometer gears you need, measure from the ground up to the center of the axle then multiply by two.
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