Originally Posted by dloudy
My I.D. label on the driver's door indicates an axle code of H9 for my truck. Couple of questions....
1. What size does this mean I have, or can you tell me where I can look to find out?
2. Does this code mean I have the trak-lock axle?
Thanks for the help....am planning to change out the differential fluid and wanted to know this before I proceed. Additionally, when I buy differential fluid....I know I have to buy synthetic. Is the XL-3 modifier neccessary, or do certain brands / types of fluid suffice without adding the modifier?
H9 means you have a 3.55LS. Limited slip is the same as Traction lok, so yes you will need XL3 additive. I don't know if other brands of oil already contain an equivalent. For type of oil, check out page 293 in your owners manual.