. If you have a car with a posi or limited slip rear, jack up the car and get both rear tires off the ground. go on the 2 series carrier 2.73 and lower ("lower" gears = higher numbers, like 3.08, 3.23, etc.) . This chart provides values that represent a 1:1 ratio on a manual transmission. . So the set up is not the same for each gear category. What Ford Manual Transmission is in my vehicle? Unfortunately, unless you have the two units side by side, it is nearly impossible to tell them apart. While they may look similar from the outside, the internal components, including ring and pinion gears are not interchangeable so make sure that you know which model you have before ordering parts. 10 Bolt: Chrysler 8.25″ Chrysler. Gear oil is nasty stuff, mostly in smell. Click “Calculate Gear Ratio”. Most 8.2 factory covers also have the strange protrusion at the top. Date and location of manufacture are stamped in the axle tube, and this table deciphers the code. What rear end ratio do I have in my Ford is it posi! Many in the automotive industry have found it easier to refer to an GM 10 Bolt 8.625 axle as an 8.6 axle, consequently just 8.6 is the term most often used. The 8.5-inch and 8.6-inch 10-bolt rears are stout and effective differentials that can handle more power than either the 7.5 or 8.2-inch rears. . . A number of factors must be considered when selecting a rear-end gear ratio (ring & pinion set). While the 10-bolt rearend’s lineage can be identified by the code stamps, which are usually on the passenger’s side axle tube, there are literally hundreds of potential codes for the three different 10-bolt rearend housings. The 8.5-inch 10-bolt also shares the same pinion shaft diameter as the more expensive 12-bolt. . The axle shafts are also held in place by four-bolt retainer plates at the outer bearing, not C-clips. Ring and Pinion Installation Instructions, Spanish Ring & Pinion Installation Instructions, Ring Gear and Pinion American Axle 7.25 inch Front, Chevy & GM 3 Speed Automatic Transmission, Mounts AMC, Buick, Cadillac, Chevrolet and GMC, Jeep Steering and Suspension Repair Parts, Import Vehicles Rebuilt Transfer Case Replacements, Manual Transmission Ratio & Size Information, Axle Rear, 21000 LBS, EATON 21065S, SINGLE SPEED. The 350 v8 cars got 8.5" 10 bolts, auto trans/350 engine got 2.73 ratio, 4speed man trans and 350 engine got 3.08 ratio Larger tires on lifted truck suffer from loss of power, changing the ring gear and pinion to a lower ratio is the answer. also on the ring gear. That being said, limited gear sets are offered for the carriers, especially if you plan to change gear ratios. In bad road conditions like mud, ice or snow, power to one wheel is bound to get you stuck. When it comes to Chevrolet rearends, it’s the 12-bolt that seems to get all the accolades. BOP stands for Buick/Oldsmobile/Pontiac. . . Many times, if you locate a 10-bolt rearend, it’s usually a 7.5-inch unit. If You’re Ready For A Really Big Big-Block, Here’s Your, Proform Parts: Carb Or EFI? When looking at the housing from the rear, an 8.5 will have two squared off chunks of casting hanging on each side near the bottom of the differential. The straight 6 cyl and 305 v8 got 7.5" 10 bolt rears with 2.73 ratio The 350 v8 cars got 8.5" 10 bolts, auto trans/350 engine got 2.73 ratio, 4speed man trans and 350 engine got 3.08 ratio The 8.2-inch 10-bolt has a smooth, round, lower-case area (no cast-in protrusions), with an 11-inch cover that has a diagonal protrusion at the top. 8.2 10-bolt: ED 21118: 2: 2.73:1 and down : EDB 30116: 3: 3.08:1 and up . Greetings all; I'm changing out the ring and pinion from my factory JM stamped axle tube 2.73 and want to lower the ratio to 3.42. side cover Overhaul Kits. Randy Bolig has been working on cars and has been involved in the hobby ever since he bought his first car when he was only 14 years old. .41-42 gm® 8.875" 12 bolt style car . The easiest way to tell the difference is by looking at the brakes. One is the small, 7.5-inch, another is the 8.2-inch, and yet two more are the 8.5 and 8.6-inch. This page is a Differential Gear Ratio Chart for comparing tire size to axle gear ratio and the combined effect on power and fuel economy. That way, you don’t unknowingly spend money on something you really do not want. . The numbers should let you know what gear-ratio came from the factory, the date of production, where the unit was assembled, and whether the carrier is Positraction or not (see charts… .43 There is an anomaly to the “corporate” 8.5-inch axle assembly that was used in some 1971 and 1972 Buick, Oldsmobile, a few 1969 through 1972 Pontiac vehicles, as well as the 1970 through 1972 Monte Carlo. 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