Ford 9" 31 Spline Full Spool HD Diff Center Section 3rd Member [3.89 Ratio]
|Part Type:||Third Member Complete Assembly|
|Case Style:||Ford 9"|
|Main Cap Material:||Aluminum|
|Main Cap Retention Style:||Bolt|
|Carrier Bearing Diameter (in):||3.250 in.|
|Pinion Support Bolt Quantity:||10|
|Standard Pinion Location:||Yes|
|Ring Gear Load Bolt:||No|
|Ring and Pinion Included:||Yes|
|Ring and Pinion Ratio:||3.89:1|
|Yoke Style:||1350 Series|
|Carrier Type:||Full Spool|
|Notes:||Rated at 850HP, Limited to 700HP due to Factory 31 spline Axles.|
|Calculator||Gear Ratio Calculator|
CASE: The aluminium available today is vastly different from that of years past. Technology has made aluminium products stronger and more durable. Knowing this, we at Traction Drive Systems decided to have an aluminium Ford 9" dropout case built. You may say to yourself, "That's nothing new, other companies have been making them for years," and that's true; but as in every Speedmaster Traction Drive Systems product, we look closely at what's out in the marketplace and how it can be improved. Our aluminium cases are made from A356-T6 aluminium, our bearing caps are one-piece billet, with a through bolt design and extra material is added to the bearing caps. These cases are offered in 3.250" bearing diameter to accommodate 28, 31 with the use of PCE207.1002 and 35-spline carriers and spools. These extras truly make this Aluminium case the ultimate Ford 9" case, rated to 850 horse power. All Traction Drive System Aluminium third members come with 12 point through bolts and a Daytona style pinion support, which gives us an advantage over our competition.
Speedmaster TDS lightweight FULL SPOOLS give you the traction you need by locking the axle shafts together, forcing your rear tires to turn at the same speed. They're CNC-machined from forged chromoly steel to provide a more rigid ring gear mounting. This eliminates gear failure caused by case deflection or differential side-gear failure.
The GEARSETS used are HI-PERFORMANCE 8620 Chrome-Nickel-Moly Steel. CNC machined from high quality forgings to our exacting specifications and then heat treated to obtain high impact and durability. Then lapped to allow for correct tooth contact and smoothness and for use in the performance market. The 8620 Gearset has proven itself in all forms of motorsport over the past 30 years Ratios available 3.25, 3.5, 3.7, 3.89 and 4.11 other ratios on request.
YOKE: Speedmaster TDS Billet yokes are a long style unit fully CNC machined to our specifications.
ASSEMBLY: Assembly has been carried out by the TDS Head differential technician. Quality is assured with 40 years experience in the Differential Repair Industry and full involvement in all forms of motorsport from V8 SUPERCAR To Group 1 Drag Racing. Our Technician is on hand to discuss your differential requirements, questions and upgraades.
NOTE: These 3rd members are to be used with a mineral based oil of a range of EP140 Extreme pressure at a minimum, NO split grades eg. 85/140 (These are not recommended), failure to use the correct oil can result in gear damage, noise and may void your warranty.