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In road racing, you get a lot of practice building rear ends. In thirty years of racing with these differentials, we had only one failure. We sheared the ring gear bolts smooth off at the Detroit Grand Prix. We fed almost 700 HP through stock stub axles and spindles, and they never broke. This is one great piece of equipment.
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 Our remanufactured differentials are sold with no core charge. We will ship freight free within the Continental US in a reusable heavy-duty box. You can use the box to send in your old differential, or you can keep it.
If the exterior of your differential appears OK, and there are no apparent defects, its total core value would fall between $100 and $400. See the core value menu for details. The freight back on your old unit is your responsibility.
All our differentials come with new ring and pinions, as well as new GM stub axles, and a GM cover, Timken bearings, seals, and an Eaton clutch pack. They are shipped complete with fill plug, and are guaranteed to perform perfectly under normal conditions and use for three years. Note: UPS won't let us fill them with oil, so they are shipped with NO OIL.
* If you want to save a few bucks, we may have the used gearset you want in stock. If we have it, we can supply any three series differential equipped just like our standard units, but with a used ring and pinion, stock rear cover and stub axles for $1499. We will not reuse a gearset with more than 1/2 of the pattern showing wear. Check stock for used gearsets.
Remember, No Core Charge, and No Freight
Note: PLEASE SPECIFY MODEL YEAR, PINION FLANGE SIZE AND THREADED OR U-BOLT STUB AXLES IN THE SPECIAL NOTES BOX AT CHECK-OUT!
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D002 |
3.08 63-79 Differential - $2196
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D004 |
3.36 63-79 Differential - $2196
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D005 |
3.55 63-79 Differential - $2196
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D006 |
3.70 63-79 Differential - $2196
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D007 |
3.90 63-79 Differential - $2548
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D008 |
4.11 63-79 Differential - $2298
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D009 |
4.33 63-79 Differential - $2298
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D010 |
4.56 63-79 Differential - $2298
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D011 |
 Add for New Eaton Style Posi Carrier with Composite Clutch Pack
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D012 |
 These ‘heavy duty’ rear covers are a solution looking for a problem. Breaking a cast iron rear cover is very rare. These weigh 21.5 lbs, 5 pounds heavier then stock. We run a stock cover in our racecar, but if you want a heavy rear cover on your new differential from Duntov, click on this.
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D013 |
 Add for Carbon Fiber Clutch Pack and Plate Set
(for the stock carrier)
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| Before REM Treatment |
After REM Treatment |
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The REM treatment shown on the ring and pinion of part #'s D014 & D015 is remarkable. The physicochemical process used to achieve this finish utilizes high density, non abrasive ceramic media and vibratory finishing equipment. The process removes microscopic surface asperities that are inherent in any machining process. The resultant part looks like it is chrome plated, but nothing is added to the part’s surface.
NASCAR engine internals are almost all REM coated, as is every moving part of their transmissions and differentials. We REM coat virtually everything in our racecar’s driveline, and the results have been significant. Gear sets last longer, differential oil temperatures are reduced, and horsepower loss in the driveline is way down.
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D014 |
 Add for REM Treated Ring and Pinion
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D015 |
 Add for
Racing Prep
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Includes:
• REM ring & pinion
• New Eaton Carrier
• 800 LB Preload Kit
• Steel Clutch Plates
• ARP Ring Gear Bolts
• Super-Duty Axles
• Racing Set-up Specs |
D016 |
 Add for Diff Cooling with drain fitting in the case
(not shown)
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| There is no core charge! If you want to send back your old differential in the fine box we send your new one in, this is the guide we will use to determine its value. When we get your core, we will disassemble, inspect and pay you for everything in there that is good enough to use in one of our differentials. |
Case with No Damage |
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$60 |
Rear Cover |
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$20 |
| Pinion Flange |
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$35 |
Sub Axles (pair)* |
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$20 |
Posi Carrier |
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$110 |
Good Reusable Ring and Pinion Sets |
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$55 |
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Total |
$300 |
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we don't reuse stub axles, but they have core
value, so we will pay you and pass them on. |
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This is an all new Eaton Style Posi carrier, and it is a vast improvement over the original equipment Eaton design. This carrier is loaded, meaning it is set up by the factory with new spider gears, heavy duty plates and springs and the new composite clutch pack. If you are building a differential for heavy duty applications, this is a good investment.
Free Freight |
D017 |
3 Series Carrier
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We use Richmond, US Gear and Yukon gearsets, as not all ratios are available from all manufacturers. Specify ratio. 4.11 gearsets are available for either the three series carrier or four series carrier.
Free Freight
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D021 |
3.08 Ring and Pinion Gear Set
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D022 |
3.36 Ring and Pinion Gear Set
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D023 |
3.55 Ring and Pinion Gear Set
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D024 |
3.70 Ring and Pinion Gear Set
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D025 |
3.90 Ring and Pinion Gear Set
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D026 |
4.11 - Thick Ring and Pinion Set
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D027 |
4.33 - Thick Ring and Pinion Set
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D030 |
Add for REM Treated
Ring and Pinion
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Kit includes bearings, seals, shims, LocTite, pattern paint, ring gear bolts and a gasket. There are a few extra parts in the kit (not shown), but rest assured, they are included at no extra charge!
Free Freight
63-79 Differential Exploded View
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D034 |
63-79 Differential Overhaul Kit
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This should be all the shims you will ever need to set up your Corvette differential. There are 4 carrier shims, 10 side shims and 10 pinion shims.
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D035 |
65-79 Eaton Differential Shim Set
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This part is not for preventative maintenance. If your stock cover is OK, don't replace it. This thing is bullet proof, but breaking the stock rear cover is almost unheard of. The Grand Sport got along fine with an aluminum rear cover. This one weighs 20 lbs vs. the stock cover at 16. It comes with a gasket and a new breather, but if you don't want to use your old drain plug, you need to order one of those too.
Free Freight
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D040 |
63-77 HD Rear Cover |
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D041 |
78-79 Differential Cover |
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D042 |
Fill Plug |
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These are selected stock covers, sandblasted and painted with Cast Blast, shipped with a gasket and breather. Some late 77's came with 2-1/2 inch rear springs, and for those cars, select part number D048.
Free Freight |
D046 |
63-77 Stock Cover |
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D048 |
78-79 Stock Cover |
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The best way to plumb your differential for cooling lines is to tap the bottom of the case for the scavenge line, but we ran this setup for years and it worked just fine. This is an OPTION, and unless you get a rear cover, there won't be anything to mount these fittings in! This option includes 3 mounted dash 6 aluminum fittings.
Free Freight
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D049 |
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This part was developed by Eaton to increase hook-up and reduce chatter. The more spring you use the more the unit will transfer power to both wheels. The springs in a standard Posi unit are weak and the end plates are thin. When whale oil was outlawed in the seventies, the spring tension had to be further reduced to eliminate chatter. These end plates are thick and the springs are twice as heavy as the stock units, but with carbon fiber clutch discs, there is no chatter. We package this set with two 40 thousandths shims, so it should be a direct replacement for your old steel clutch pack.
Free Freight |
D052 |
HD Carbon Fiber Posi Clutch Kit |
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These kits comes with new springs, plates, steel clutch discs and stays. The 200 lb. kit is for a stock installation. The 800 lb kit has special heavy duty plates and springs and is intended for racing aplications only.
Check here for an exploded view of the Eaton Posi unit.
Free Freight |
D054
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OEM 200 lb. Posi Clutch Kit
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D056 |
Racing 800 lb. Posi Clutch Kit
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D058
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63-79 Reman Carrier
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D060
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65-79 Pinion Crush Sleeve
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These are reconditioned flanges, guaranteed to be perfect. The 65-70 unit is 3 7/8 inch across, while the 68-79 is the larger size, at just over 4 1/4 inches across.
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D070
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Big 68-79
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D072 |
Small 65-70
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These are NEW GM differential carrier axle yokes. The HD threaded units are
GM part # 3872922, while the U bolt style is GM part # 14016436.
Free Freight |
D081
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One Threaded Stub Axle
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D082
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One U Bolt Style Stub Axle
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These come with Grade 8 bolts and washers. They fit the original equipment D081 HD stub axles. This is enough for one stub axle. You will need to order 2 for a car set!
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D083 |
1 Stub Axle Set: 2 Caps, 4 Bolts and Washers |
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These are for applications north of 600HP. They are sold individually, and are priced EACH. They come as shown with Heavy Duty caps and Grade 8 bolts.
Free Freight |
D084 |
One Super Duty Stub Axle
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This assembly is all GM, with Spicer maintenance-free U joints.
Free Freight |
D085 |
One 3 Inch Diameter Half Shaft Assembly
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D086
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One 2.5 Inch Diameter Half Shaft Assembly
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These are reconditioned GM parts. You have your choice of the later model 3 inch diameter tubes, or the early model 2 1/2 inch shafts.
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D087
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One 3 Inch Diameter Half Shaft
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D088
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One 2.5 Inch Diameter Half Shaft
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This is a perfectly straight, reconditioned GM Spicer half shaft flange.
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D089 |
63-79 Half Shaft Flange
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These are the proper style Spicer U joints with no grease fitting,
sold in pairs.
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D090 |
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D092 |
68-70 Auto Driveshaft or 71-79 Driveshaft
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D094 |
63-67 Driveshaft or 68-70 4-Speed Driveshaft
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If you are trying to match up a small driveshaft with a large differential pinion yoke, or vice versa, this little offset U Joint will save you a big headache.
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D098
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63-79 Offset Driveshaft U Joint
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Original molded OEM upper and lower Rubber Bushings fused to steel, with bolt, nut and washers, or choose the harder Poly Bushing.
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D100 |
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D101 |
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These are sold by the Pair, as shown.
Free Freight |
D102 |
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If your differential crossmember is rusted out, you may want to go with one of these. They are rust free reconditioned units with new bushings installed. Free Freight |
D105 |
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D106 |
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D114
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3 Quarts of Royal Purple
Gear Lube
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65-79 Eaton Differential Shim Set
HD 63-79 Differential Cover
Stock 63-79 Differential Cover
HD Carbon Fiber Posi Clutch Kit
Steel Posi Clutch Kits
65-79 Pinion Crush Sleeve