GMC 2005 T-Series Owner's Manual page 236

Rear Axle – Tandem
DS404 (front)
RS404 (rear)
Rear Axle – Two-Speed
19060T; 21060T
23080T
Transmission Fluid, Automatic
2400 Series; 2500 Series
MD 3060 P; MD 3560 P
*Add 2 pints (1 L) when changing spin-on or remote filter.
See the Allison Automatic Transmission Operator's Manual for fluid check and maintenance information.
Transmission Fluid, Manual
FS5406; FS6406
RT8709B
RT8908LL
All capacities are approximate. When adding, be sure to fill to the approximate level, as recommended in this
manual. Recheck the fluid level after filling.
Engine
7.8L
5-86
Capacities and Specifications (cont'd)
Application
Engine Specifications
RPO
LG4
English
31.0 pints
28.0 pints
34.0 pints
40.0 pints
35.0 pints*
52.0 pints
18.4 pints
25.1 pints
29.1 pints
Type
L6
Capacities
Metric
14.5 L
13.0 L
16.0 L
19.8 L
13.5 L*
24.6 L
8.7 L
11.8 L
13.8 L
Firing Order
1–5–3–6–2–4