Post
by Anton » Thu Oct 31, 2019 7:36 pm
410 diffs are not interchangable with 413 and Samurai diffs. They're physically smaller. I believe that they will interchange with LJ diffs, but I may be wrong - Donkeychomp or ScottieJ will probably know that.
When Robbie said that 410 and 413 axles are the same but with different diffs, he meant that the 410 axle housing is the same width, but the diff is physically smaller. You can't put a 413 diff in a 410 axle (or vice-versa). The samurai axle is wider than the 410 or 413 axle, but with interchangable diffs.
You need a 413 diff, and it has to be a rear one. The splines for the halfshafts are different from front to rear.
A samurai rear diff will fit, but the ratio will be off. That may be acceptable to you, but be careful how you drive the vehicle if you do that. If you keep it in 2wd (Road car) then it'll probably never be an issue.
I had a 413 with narrow axles, and swapped in the axles from a samurai for better track width and better clearance for my big mud tyres (they rubbed on full articulation).
If you can't find one 413 diff, then a pair of samurai diffs might be a solution. Swapping the whole axle involves cutting off spring perches and welding them back on further inboard, as 413's have springs mounted further in than Samurai's.
Best option is to find a 413 diff though.
*Edit* - 410 diffs are also a very different ratio to 413 diffs.
