What’s Inside a Helical Limited Slip Differential?

46 thoughts on “What’s Inside a Helical Limited Slip Differential?”

1. U know way too much man.

2. 👍👍

3. Not that great. I like some slippage, but this doesn't look forgiving to tires.

4. Finally, a LS differential video that did NOT confuse me. I've watched other videos about this subject in the past and I was trying to think, but nothing happened. Thanks, ETCG!

5. Glad too see you back Eric.. Take care.

6. That was neat!

7. I have that type of LSD I have in my van. Detroit TrueTrac

8. awesome.

9. How many of us built the rear diff with Legos back in the 80s? 🙂 LOVE THIS RETURN OF ETCG!!

10. Would this be the differential that we would find in a 1996-2004 Acura 3.5RL..?
    Great video,
    Thank you sir.

11. Good to see ya, Eric! Cheers!

12. Very good Eric, i enjoy all of your videos that you put out. Have learned alot from just watching your videos. Keep making more cause i am waiting on them.

13. I wonder how many cars still use this kind of Unique differential.

14. Love the birds chirping! Spring is in the air!

15. Does this mean you have a garage to work out of now??

16. Smashing demo Eric 😀
    A very complex and simple design lol.
    Years ago i watched a 1940's film about the differential on you tube.
    It was really basic and narrated by Jam Handy.
    I imagine you may have watched it for a laugh 😀
    Eric, wear a mask as the new strain of covid spreads faster.
    Stay well.

17. Cool dog!

18. Good design, so nice to see a new video from you 👍

19. The man that taught me everything I know now, miss watching your vids man

20. It's a pleasure to once again hear your voice and profit from your expertise. Thank You Sir.

21. 👍thank you fot sharing

22. Just a suggestion, it might be cool if you post those short video clips you normally post on social media on YouTube Shorts as well.

23. I first understood "what's inside a hellcat limited slip diff"

24. Glad to see you post again, but whats with the vertical video?!?!

25. Nice to see your still out there man, hope your keeping well and looking forward to the day you make a comeback.

26. Good to see you Eric. So that's what one looks like. I'd always wondered. 🙂

27. I’m glad your videos are back. During my automotive training watching these instructive videos has made me the automotive tech I am today. Thank you.

28. Thanks for sharing Eric👍
    We really miss your content, hopefully things will resume to normal soon🤞
    Stay Safe Bro👍

29. The Eaton Trutrac helical gear differential is pretty awesome too. It’s construction is a little different than this but I assume it operates like this Integra Tyle R differential.

30. Heard of those helical differentials but never seen the inside of one. I've been told that with those that if you get into a free wheeling situation that you need to apply a little braking with the gas to give some resistance in order for the diff to lock up. My '74 C20 has an open diff and I'm undecided whether to replace it with a helical, a standard clutch based, or a manual locking diff. Didn't know that these helicals wear out. Now I'm leaning towards a manual. Thanks, Eric!

31. Neat!

32. Brought to you by Keyhole video productions inc. —

33. The best of the bunch for us DYIers IMHO:
    
    Logging: Nor Cal Timber Faller with Dan Leeper
    
    Automotive: ChrisFix and Eric the Car Guy
    
    Small Engine and power equipment: DonyBoy73 with Donny and help
    
    Furnaces, water heaters, and most every appliance: Jay over at Word of Advice TV
    
    What makes these folks stand out from the rest? their knowledge, their communication skills, and they don't spend a lot of time self-promoting or doing goofy stuff to keep ya' watchin'. They patiently explain everything so nothing is missed. There are lottsa' good folks out there, and these really stand out.

34. Thank you Eric I enjoy watching your videos watching from South Africa

35. Eric, I'm sorry, but you've described the internal gears function incorrectly. None of the gears slide side to side, and the dumbell-looking gears definitely do not mesh with both central output gears. If you look down into the housing you can see the short gears and the dumbell-gears sit at different heights. The lower output gear drives the 4 dumbell-gears (up past the upper output gear)……the 4 dumbell-gears then drive the 4 short gears (which reverses the rotation)……finally the 4 short gears then go back down and drive upper output gear.

    Additionally it's not that the helical gears that are forced sideways creating the braking torque. It's actually that the engine is turning the housing which has to physically pushes against those internal gears to drive the wheels. This creates pressure against the face of the short & dumbell gear teeth as shown in the diagram. If you go back and look at the short & dumbell gear teeth, you can see their tips are machined flat into a perfect cylinder. This is the surface that provides the braking friction against the housing. The harder the engine torques the housing, the more braking pressure is created on that cylindrical surface.

    Now, can you please explain why my factory LSD starts knocking when my fluid gets old (05 TL Sport 6-speed w/ factory LSD)? Knocks during tight turns when fluid is old and it's very cold out. Change out fluid and it's been gone since. Noticed a few tiny silver aluminum non-magnetic flakes in my old fluid.

36. Hi Eric. A bit like the diff in semis we had a diff lock switch in the cab in case we got stuck . Would be nice to have it in cars .

37. That acts more like a mechanical locker than an LSD. It looks like once the gears are engaged with the case, there is no slip allowed and the axles are essentially "locked" together. I would be interested to see if there are any drivability issues that come from this after it's installed. Thanks for the video and great to see you posting again!

38. Thanks Eric ❤️

39. Glad to see you're back in some form. Love it. Great video. "Stay Dirty!"😋

40. Who else read this as a Hellcat limited slip differential 😂

41. That is a helical differential but not a torsen differential. Torsen diffs operate differently. For easy reference the helical gears of a torsen diff are perpendicular to the rotating axis.

42. Cool!

43. You're pretty awesome Bro!

44. Videomaking is probably inside your spinal column at this point Eric 😂 I always enjoy your videos but this video more than usual i must say!! Something about the exploratory nature and curiosity of it…

45. Eric I always love how you break things down and show us how it works great job miss your videos dude.

46. Watching this puts me in a meditative state…especially with the background soundscape🌲🕊️…this is like AMSR! 😅
    …I’d be so afraid to take those little gears ⚙️ out from the casing…afraid to not know where everything fits once it were time to put Humpty 🥚 back together again! 😂
    Your confidence is genius!
    😊

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