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Spartan Locker Helical LSD Dana 30 27 Spline

mikep said:
The early 3-bolt case version for front of a jeep. There was a group buy. 398 was the last 3 digits of the part number. Then we used the 411 suffix, high pre-load for RWD. Still a softer case with 3 case bolts.
The newest ones have a harder case and 6 (3 pairs) of case bolts.
Click to expand...

I was one of the early buyers with the 398 no preload version. It's now got about 85k miles on it and it's loud and clunky.
 
Be aware that at least one of the suppliers selling these Spartan helical LSD are now listing it as fitting the Volvo 240 rwd. No mention of having to swap the internals around. It is an ebay listing but it's not my listing and it's easy enough to find on ebay if you want to look. Just thought I'd
post a heads up.
 
we have a spartan locker in our rallycross 240. works fine for driving in anger on dirt and gravel, can't really vouch for anything else so far. having installed it, i'm unclear what's meant by swapping or flipping the internals. the two halves are identical in my memory, and you have to insert it all into the carrier one chunk at a time anyway. would like clarification to know if we just got lucky or if this diff doesn't actually have to be flipped/swapped.
 
Quin said:
we have a spartan locker in our rallycross 240. works fine for driving in anger on dirt and gravel, can't really vouch for anything else so far. having installed it, i'm unclear what's meant by swapping or flipping the internals. the two halves are identical in my memory, and you have to insert it all into the carrier one chunk at a time anyway. would like clarification to know if we just got lucky or if this diff doesn't actually have to be flipped/swapped.
Click to expand...

The lockers go in either direction. The helical LSD internals are front/rear specific.
 
What?s different is the angle of the spirals on the internal gearing. They aren?t like ?1.5? clutch types that work different forward/reverse.
 
mikep said:
What?s different is the angle of the spirals on the internal gearing. They aren?t like ?1.5? clutch types that work different forward/reverse.
Click to expand...

I had heard and read that you want swap the gears around internally if using a front diff in a rear application. The drive torque would be like driving in reverse, and this will axially thrust the helical gears in the opposite direction. Usually there is a hardened wear plate or a friction plate in the axial thrust direction on most helical diffs. Using them in the wrong direction wears the softer housing material more than a helical usually does.

I'm not sure if there's an actual TBR difference, but there may be depending on how the cases are machines.

Here's a vid I posted a while back: https://www.youtube.com/watch?v=hJGSsMLaelU

But looks like doing that with the Spartan helical didn't result in any noticeable change: https://forums.turbobricks.com/showpost.php?p=6276126&postcount=568
 
After flipping the gears mine does an ok job in the rain and such, but not with sticky tires and warm asphalt. It's just a one tire fire in that scenario. Honestly, if you drove my car on track you'd think it was open diff.

Also, I have no idea what the other aftermarket offerings are like, but I didn't like how sloppy the axle splines felt in the Spartan compared to the original carrier. You get what you pay for really, and I'd go for the lunchbox locker if it's just a for fun car.
 
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