It was used in different models by all GM divisions – with the exception of Cadillac. But, did you know there is more than one style of 10-bolt rearend? It first appeared in 1970 production cars as a corporate replacement for the 8.2-inch 10-bolt rearend. Inside, the ring-gear bolts are the same as the 8.5 corporate unit, but the pinion-shaft diameter measures 1.438 inches. There were an untold number of 8.2-inch axle assemblies built, and although it is only marginally stronger than the 7.5-inch rearend, it does have some aftermarket support. Many 400 cubic inch small blocks are only drilled with holes A and C for the 2-bolt staggered starter drive used with 168 tooth flywheels/flexplates. complete engine set Best #RS504S. 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. If you’re looking for a good.economical 10-bolt rearend to rebuild or install into your hot rod, you will need to be able to accurately identify the different units so you don’t accidentally come home with a 7.5 or 8.2-inch differential. That way, you don’t unknowingly spend money on something you really do not want. Since listing them all within this article is impossible, we’ll be focusing only on visual identification. Identical to the originals. You will need to know that there are different series’ of differentials (series two and three). The speedometer drivegear only came as a molded 8-tooth gear. Are Your Hot Rod’s Fluids Ready For Summer Cruising? That being said, it is not recommended for use behind engines that make a serious amount of horsepower. Although the 7.5-inch 10-bolt closely resembles the 8.5-inch housing, you can positively identify the Chevy 7.5-inch rearend by measuring it. Rightfully so, because when comparing the 10 and 12-bolt units, it’s definitely the more durable of the two. 1921-1928 Valve Adjustment Screws with Locking Nuts that use 7/16-20 threaded rocker arms. The push rod ends are case hardened as were the originals. The Dana 20 is generally compatible with the "big hole" Dana 18. Popular. Most rebuilt engines have left these out, endangering both the push rod ends and the adjustment screws. Go To: STARTING SYSTEM-Bendix Drive, Springs and Starter Switches, COOLING SYSTEM-Hose, Clamps, Elbow, Belt, Miscellaneous, FUEL SYSTEM-Fuel Pump Parts, Carburetor Parts. or #RS504C, 1934 or early 1935 with 45� valve seats  Master 207 6 cyl. 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The slot width of .315 inch remained unchanged. 300 hp 350 ci Gm crate motor only 4000 km's on motor. Shifter linkage arms were changed because the drive slot now had to be longer to match the drive portion of the mating shaft. We'll send you the most interesting Chevy Hardcore articles, news, car features, and videos every week. If you find a rearend that uses a large spring perch like this, it is from either an X or F-Body. No modification necessary. 7.5-Inch . Case hardened tappets are ground on the bottom with a shallow cone shape to lengthen operating life. We would like to show you a description here but the site won’t allow us. This unit is becoming popular for its strength and ability to accept multiple ring and pinion ratios. 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. 1925-36 Chevrolet Parts, Reproduction, New Old Stock, or New Old Replacement Stock. Again, this would be okay in a daily driver or cruiser application, but if installed behind an engine with horsepower numbers climbing into the 400 range, you can plan on an eventual failure. It is internally different from the 8.2 Chevy, but has the same external bosses and brackets. Ratchet shifter. These are exactly as the original rods in appearance, but are induction heat treated on the ends (about 3/4") to give longer life. If it takes a 1/2-inch wrench to remove it, it’s an 8.2. The 8.5-inch 10-bolt rearends have ten 3/4-inch hex head bolts with 7/16-20-inch left-hand thread bolts that hold the ring gear to the carrier. Our brochure for these 1916-36 Chevy items is now back and covers more parts than it used to. All rights reserved. The easiest way to identify the 8.2-inch rearend at a glance is by the shape of the housing and the spacing between the lower bolts on the cover. The axles are retained by a set of C-clips on the inner end of the axle shaft inside the carrier. The X and F-body spring perches come in two versions: mono-leaf (left) which is shallower than the multi-leaf (right). Driveline parts for Ford Chevy Dodge Jeep Oldsmobile Pontiac Cadillac GMC 2 WD … Another way to tell the difference between an 8.2 and an 8.5 rearend is to pull the cover and look at the bolt holding the spider gear crosspin. These 2 shafts and 8 bushings appear identical to the originals, but the shafts are heat treated chrome-molybdenum steel, giving exceptional wear resistance with these bushings. The distance between the bottom center bolt in the cover and its adjacent bolts is 3 1/4 inches. The Vega first went on sale in Chevrolet dealerships … 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. There are 7 sections to look at including: STARTING SYSTEM, Cooling System, FUEL SYSTEM, ENGINE PARTS, OIL PUMP, TRANSMISSION and DRIVE LINE, The easiest way to tell the difference is by looking at the brakes. Dennys Driveshaft are high speed high rpm balanced and tested for optimum racing and hot rod performance. 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. Packaged in full engine sets... 1929-1931 or 1932-1936 Main Bearing Shims (set of 2 each for Front, Center and Rear Main Bearings), New Old Stock shims .008 inch thick pack. 1926L-28 these models/series. Denny's Driveshaft and Driveline Parts Specialist custom built high performance steel and aluminum driveshafts for street rod race car van pickup 4x4 truck. The covers on the 8.5-inch rearends are often 11 inches round with a bulge on the driver’s side to accommodate the ring gear. The early (AA) rocker arm shaft bushings have the same outside diameter of .787" as the 1929-31 rocker arm shaft and bushing sets, while the later sets (BB) have an OD of .818 Out of Stock. Like the 8.2-inch 10-bolt, the 8.5 10-bolts use C-clips to retain the axles. If it takes a 5/16-inch wrench to remove it, it’s an 8.5. Most of the original adjusting screws show failure of the threads, often galling in the locking nuts. The 8.5-inch 10-bolt also shares the same pinion shaft diameter as the more expensive 12-bolt. While a carrier-bearing girdle is available for the 8.2-inch rearend – and does give some support to the housing – it doesn’t provide a reliable and suitably strong solution. Most 8.2 factory covers also have the strange protrusion at the top. The 8.5-inch 10-bolt rearend was used in cars and trucks over a wide range of years. These rods are exactly as the original rods in appearance, but are induction heat treated on the ends (about 3/4") to give longer life. complete engine set Best #RS504S. Borg-Warner T-56 N/A 6 N/A Yes 2.97, 1.94, 1.35, 1.00, 0.84, 0.62 N/A Aluminum case Borg-Warner T-56 ... Ford 9 3/4 inch Differential Upgrade Replacements for 8.8 inch ... Bargin Basement Differential Part Save Money! The 8.5 rearend will have a round cover, and part of the cover will extend rearward to make room for the ring gear. However, the gears will not interchange with a Chevy 8.2. For this term of years, valves are usually $20.00 each, subject to change depending upon supply. 1986 Chevy S-10. 355 gears posi. Unfortunately, unless you have the two units side by side, it is nearly impossible to tell them apart. The truck is a Prostreet build but was raced a fair bit in the past with a different engine. These are brand new reproduction made in the USA to the exact specifications as the originals.... We have available in a limited supply NORS valves for these year Chevy. The push rod ends are case hardened. Replaces originals which have enlarged valve stem holes in the caps and edge wear on the keys. 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. 1929-1934 ALL except 1934 Master DA, DB, P Valve Spring Caps & Valve Stem Keys (set of 12 of each). There is a difference, but you can’t see it unless you set both units on their side, and then measure the distance from that surface to the face where the ring gear attaches. Sometimes the nuts cannot be removed at all. The later bushings are slightly different sizes too. Available in two-door hatchback, notchback, wagon, and sedan delivery body styles, all models were powered by an inline four-cylinder engine with a lightweight, aluminum alloy cylinder block. The output for the front drive shaft is on the right side and the rear output is in line with the input. Our old brochure form no longer works so put brochure in the subject line and your address in the content of the e-mail. 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Listed By bhn500. These 2 shafts and 12 bushings appear identical to the originals, but the shafts are heat treated chrome-moly steel, giving exceptional wear resistance with these bushings.