63 - 79 Differentials & Driveline

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.

63 -79 Differentials
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, a new HD rear 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 and stock rear cover for $895. 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!
Differential Options
Part # D011 $446
 
Add for New Style Eaton Carrier with Carbon Fiber Clutch Pack
 

Part # D013 $67
 
Add for Carbon Fiber  Clutch Pack and Plate Set 
(for the stock carrier)
 
2.72 Part # D001 $1295
3.08 Part # D002 $1,295
3.23 Part # D003 $1,365
3.36 Part # D004 $1,295
3.55 Part # D005 $1,245
3.70 Part # D006 $1,245
3.90 Part # D007 $1,295
4.11 Part # D008 $1,295
4.33 Part # D009 $1,365
4.56 Part # D010 $1,375

 

Racing & High Performance Options
Before REM Treatment
After REM
Treatment

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.

Part # D014 $150

Add for REM Coated
Ring & Pinion
 

Differential School
(CLICK HERE)

Part # D015 $895 
Includes:
•  REM ring & pinion
•  New Eaton Carrier
•  800 LB Preload Kit
•  Steel Clutch Plates		 •  ARP Ring Gear Bolts
•  New Pinion Flange
•  Super-Duty Axles
•  Racing Set-up Specs
Add for Racecar Application
 

Part # D016 $120

Add for Diff Cooling with drain fitting in the case
(not shown)
 
 
Corvette Differential Core Values
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
$60
Rear Cover
$20
Pinion Flange
$35
Stub Axles (pair)*
$20
Posi Carrier
$120
Good Reusable Ring & Pinion Sets
$80
Total:
$335
* we don't reuse stub axles, but they have core value, so we will pay you and pass them on.
Click to Enlarge

63-79 New Loaded Posi Carrier
This is the all new Eaton 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 carbon fiber clutch pack. If you are building a differential for heavy duty applications, this is a good investment.
Free Freight
$499    Part # D017
3 Series Carrier
$524    Part # D018
4 Series Carrier

63-79 New Ring & Pinion Gearsets
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

Part # D014 $150

Add for REM Coated Ring & Pinion
 
$358   Part # D021
Ring & Pinion Sets
for 3 series carrier
Specify Ratio
Ratio:
$266   Part # D022
Popular New Ring & Pinion Set for 3 series carrier
Specify Ratio (3.55 & 3.70)
Ratio:
$358   Part # D023
New 4.11 Ring and Pinion
Set for 4 series carrier

63-79 Differential Overhaul Kit
If you don't need a clutch pack, this should do the job. GM gear lube only with carbon fiber clutch pack. Free Freight

63-79 Differential Exploded View

$194    Part # D034


Lube Type:

 

65-79 Eaton Differential Shim Set
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. Free Freight
$72   Part # D035
Differential Shim Set
HD 63-79 Differential Cover
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
$118   Part # D040
(63 - 77)
$120   Part # D042
(78 - 79)
$18   Part # D044
(Fill Plug)
Stock 63-79 Differential Cover
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
$58   Part # D046
63-77 Stock Cover
$60   Part # D048
78-79 Stock Cover

Rear Cover Machined for Cooling Lines
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
$120   Part # D049
Add for Diff Cooler Fittings

 
HD Carbon Fiber Posi Clutch Kit
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

$206    Part # D052

Steel Posi Clutch Kits
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 on the link for an exploded view of the Eaton Posi unit. Free Freight

View Posi Exploded View
$176   Part # D054
OEM 200 lb.
Posi Clutch Kit
$186   Part # D056
Racing 800 lb.
Posi Clutch Kit

65-79 Pinion Crush Sleeve
Remember, our free freight policy starts with a total order size of $20. For orders less than $20, add $5 for freight to anywhere in the Continental US.

$12    Part # D060

65-79 Differential Pinion Flanges
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. Free Freight
$72   Part # D070
(Big 68 - 79)
$106   Part # D072
(Small 65 - 70)

63-79 Stub Axles
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
$109    Part # D081
(One Threaded Stub Axle)
$109    Part # D082
(One U Bolt Style Stub Axle)

HD Stub Axle Caps
Shown is One Car Set, but priced is One Stub Axle Set! These come with Grade 8 bolts and washers. They fit the original equipment D081 HD stub axle.
Free Freight

$34    Part # D083
1 Stub Axle Set: 2 Caps,
4 bolts & washers

63-79 Super Duty Stub Axles
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

$249    Part # D084
One Super Duty Stub Axle

63-79 Half Shaft Assembly
This assembly is all GM, with Spicer maintenance-free U joints.
Free Freight
$188  Part # D085
One 3 inch Diameter GM Half Shaft Assembly
$199  Part # D086
2-1/2 inch Diameter GM Half Shaft Assembly
63-79 Half Shaft
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.
Free Freight
$78  Part # D087
One 3 inch
Diameter Half Shaft
$84  Part # D088
One 2-1/2 inch
Diameter Half Shaft
63-79 Half Shaft Flange
This is a perfectly straight, reconditioned GM Spicer half shaft flange.
Free Freight
$62  Part # D089

63-79 U Joints
These are the proper style Spicer U joints with no grease fitting, sold in pairs.
Free Freight

(Refer to chart below to determine proper part for your Corvette)
$50  Part # D090
$46   Part # D092
$42   Part # D094
D090
D092
D094
 63-79 Halfshaft
68-70 Auto Driveshaft
63-67 Driveshaft
 
71-79 Driveshaft
68-70 4-speed Driveshaft
63-79 Offset Driveshaft U Joint