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Spool Performance – Mercedes AMG 725 9G FX-RT Upgraded Clutch Kit SP-AMG725-CK

$4,499.00
$3,499.00
(You save $1,000.00 )
SKU:
SP-AMG725-CK
Weight:
18.00 LBS
Shipping:
Calculated at Checkout
Spool Performance – Mercedes AMG 725 9G FX-RT Upgraded Clutch Kit SP-AMG725-CK

Description

Spool Performance – Mercedes 725 9G FX-RT Upgraded Clutch Kit

The Mercedes 725 9G transmission is robust from the factory but begins to show its limits past ~700 Nm of torque. Stock friction packs and limited plate counts can slip under repeated high-load or high-temperature shifts.

Spool Performance’s FX-RT Upgraded Clutch Kit transforms your 725 9G into a competition-ready transmission, rated for up to 1,700 Nm of input torque, using our proven high-coefficient FX-RT friction technology.

Key Features

  • FX-RT High-Coefficient Friction: +20% μ for improved static and dynamic holding power.
  • Increased Clutch Counts Across All Packs: Dramatically improves torque capacity in every gear.
  • Pre-Measured and Packaged: Simplifies assembly, ensures consistent clearances, drop-in compatibility.
  • Custom Pressure Plates: Optimized for clutch apply, reduced shift flare, and smoother engagement.
  • No Machining Required: Compatible with factory drums, pistons, and snap-ring locations.

Clutch Count Upgrade

Clutch Stock Upgraded Increase
A 4 6 +2
B 4 7 +3
C 5 7 +2
D 6 9 +3
E 6 9 +3
F 7 10 +3

Torque Capacity Gains

Gear Engaged Clutches Torque Increase
1st B C E +68%
2nd C D E +68%
3rd B C D +68%
4th B C F +68%
5th B D F +71.4%
6th D E F +71.4%
7th B E F +71.4%
8th A E F +71.4%
9th A B F +71.4%
  • Factory Rating: 1,000 Nm
  • FX-RT Upgraded Rating:
    • 1st–4th: ~1,680 Nm
    • 5th–9th: ~1,714 Nm
    • Overall Capability: ~1,700 Nm

Who This Kit Is For

  • High-power M177 AMG builds
  • GLE63 / GLS63 high-boost setups
  • Tuned E63 / S63 with hybrid turbos
  • Track-driven AMG applications
  • Anyone targeting 1,000+ crank hp

What’s Included

Clutch Packs (Pre-Measured & Packaged):

  • A [B08]: 6 × FX-RT frictions, 6 × steel plates, 1 × custom pressure plate
  • B [B05]: 7 × FX-RT frictions, 7 × steel plates, 1 × custom pressure plate
  • C [B06]: 7 × FX-RT frictions, 7 × steel plates, 1 × custom pressure plate
  • D [K81]: 9 × FX-RT internal spline frictions + steel, 9 × external spline discs, 1 × custom pressure plate
  • E [K38]: 9 × FX-RT frictions, 9 × steel plates, 1 × custom pressure plate
  • F [K27]: 10 × FX-RT frictions, 10 × steel plates, 1 × custom pressure plate

Additional Notes:

  • Pre-packaged by clutch pack for simplified assembly
  • Fully compatible with factory drums, pistons, and snap-ring locations
  • Ideal for high-torque AMG builds pushing past factory limits

This Mercedes 725 9G FX-RT Upgraded Clutch Kit gives your AMG transmission the strength, durability, and torque capacity to handle high-boost, high-RPM builds confidently and reliably.

Note: 'New' merchandise may be returned for exchange or refund within 15 days from the date of shipment. 'New' merchandise must be unused and free from installation or mounting damage. Installation or modification of parts waives your right to returns, refunds, or exchanges.