Quote:
Originally Posted by Kobault
My 2004 4x4 has an open 4.10 8.8 rear diff for some stupid reason (axle code 87). My local junkyard has a 220K 2003 Level II with an R7 (4.10, 8.8, LS). That should theoretically be plug and play pretty much, right? Are there any problems I might run into? Any tips?
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When I did this to my truck, there were many setbacks, however most were due to a disc brake swap as well. Swapping in a new axle with high miles, you'll need to check and replace a few things.
U Bolts: when you remove the axle, keep the bolts as you will need new ones and the Level 2 axle is thicker than a regular Ranger axle so it isn't an easy part to find. I went to a local spring and suspension shop who made me U Bolts for next to nothing.
Bearings and seals: the axle bearings and seals at 220k miles are going to be a bit worn out, and it would be a smart idea to replace these before you have to. Just order parts for a "ranger with a 8.8 axle" as that is what these axles are under. The other 8.8 axles use 7.5 axle parts.
Diff fluid: these axles need a different fluid than regular clutch driven LS diffs on Rangers. I believe it is 70W 140 with LS additive.
While changing the fluid inspect the teeth and all moving parts to ensure nothing is in need of replacement.
Keep in mind this is a gear driven Torsen limited slip and not a clutch driven one so it will act differently (sends torque to the wheel with the most traction unless one is in the air, in which case that one will spin freely as if in an open diff)