COST COMPARISONS
A comparison of the 7.625-inch 10-bolt ring and pinion (top-center and right) versus an 8.875-inch 12-bolt car application (bottom-center and left) shows how the 12-bolt components dwarf that of the 10-bolt. Below are charts to help you wade through the choices when it comes to Fourth-Gen rearends.
| 10-BOLT BUILD: COMPLETE |
| Part/Service | Part Number | Price | Vendor |
| Parts, various | See parts list | $1,280.05 | Randy's Ring & Pinion |
| 10-Bolt (used) | N/A | $300.00 | Texas Drivetrain Perf. |
| Powdercoat housing | N/A | $100.00 | Enduro Powder |
| Straighten/weld axle tubes | N/A | $85.00 | Peyton Automotive |
| Rebuild labor and installation | N/A | $325.00 | Texas Drivetrain Perf. |
| Total | $2,090.05 + Shipping |
| Total minus housing/powdercoating | $1,690.05 |
| |
| 10-BOLT BUILD: PARTIAL |
| Part/Service | Part Number | Price | Vendor |
| Yukon axles | YAG 26059962 | $ 175.00 | Randy's Ring & Pinion |
| TA differential cover | YPT3-GM7.5 | $ 148.11 | Randy's Ring & Pinion |
| TA stud kit | 1815 | $24.99 | Randy's Ring & Pinion |
| Fluid/gasket | Various | $25.00 | GM/Auto Store |
| Straighten/weld axle tubes | N/A | $85.00 | Peyton Automotive |
| Labor | N/A | $100.00 | Texas Drivetrain Perf. |
| Total | $558.10 |
| |
| 12-BOLT BUILD: COMPLETE |
| Part/Service | Part Number | Price | Vendor |
| Moser 12-bolt | 96-12B | $2,148.00 | Thunder Racing |
| ABS setup | 96-ABS-3CH | $100.00 | Thunder Racing |
| Fluid/gasket | Various | $25.00 | GM/Auto Store |
| Rearend installation | N/A | $200.00 | Texas Drivetrain Perf. |
| Total | $2,473.00 + Shipping |
| According to Thunder Racing, "The Moser 12-bolt comes stock with 30-spline axles and a posi-traction unit. It can be used on three and four-channel ABS applications. The most popular options are 33-spline axles and an Eaton posi. For an extra $125 over the price listed above, you get stronger axles and a heavy-duty differential." |
| |
| FORD 9-INCH BUILD: COMPLETE |
| Part/Service | Part Number | Price | Vendor |
| Moser 9-inch | Special order | $2,390.00 | Thunder Racing |
| ABS setup (four-channel only) | Special order | $100.00 | Thunder Racing |
| Fluid/gasket | Various | $25.00 | Ford/Auto Store |
| Rearend installation | N/A | $200.00 | Texas Drivetrain Perf. |
| Total | $2,715.00 + Shipping |
| According to Thunder Racing, "The Moser Ford 9 comes stock with 31-spline axles and either a Ford Traction-Lok or Truetrac differential. The most popular configuration is a full-out racing rearend with 40-spline axles, spool, and Pro-Street gears that retails for $2,900. Three-channel-equipped Ford 9-inch rearends are not available, but a four-channel setup can be utilized." |
| REAREND FACTS |
| The largest contributors to how much horsepower and torque a rearend can hold are the size of the ring gear and the axle-spline count. As the size of the ring gear increases, so too does the weight of the housing and the amount of drivetrain power loss. A typical 12-bolt weighs approximately 190 pounds, or over 15 pounds more than the 7.625-inch 10-bolt. A Ford 9-inch clocks in at approximately 200 pounds unless optioned with an aluminum centersection, while the burly Dana 60 is almost 215 pounds. |
| Rearend | Applications | Ring Gear | Axle Splines |
| 10-bolt | F-body ('82-89), G-body ('81-88) | 7.500-in | 26 |
| 10-bolt | F-body ('90-02) | 7.625-in | 28 |
| 10-bolt | A-body ('64-72) | 8.125-in | 28 |
| 10-bolt | A-body ('73-'81), F-body ('71-81) | 8.500-in | 28 |
| 12-bolt | A-body (F-body 1970) | 8.875-in | 30 |
| 9-inch | Ford | 9.000-in | 30 |
| Dana 60 | Chrysler | 9.750-in | 31 |