Weight of rear diff
 

Does anyone have a good approximation of what the rear diff weighs?

Trying to decide if I want to tackle installing my new lsd myself or just take it to a shop.

All I can say is that it is f4rking heavy .... I can lift it myself off the floor (just) but you will require a transmission jack and the car in the air to do anything with it.

Forget any idea of holding it above you head yourself.

Unless you have a hoist and transmission jack, forget it - not worth the hernia !!

i'll weigh mine tomorrow-still have it out....i lowered it down onto my chest & rolled it off/ heavier than i thought;but i will post weight tomorrow.

Attachment 112715
80lbs. Without cover


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Yep :iagree: that's about what mine weighed when I shipped it to it's new home.

To the OP as mentioned, they have these things called floor jacks that make it easier to manipulate. ;)

85lbs. with rear cover bolted on & oem front mounts attached (no oil)
that is with a Quaife ATB (QDF10L) installed for an A/T ~Z~
Did not weigh it with open diff. (carrier w/spider gears & cross pin)

Thanks for the numbers.

Think I'll just take it to a shop based on the weights.

I'm 62 and I had no problem R&R this.

i'd take it to a shop, if you drop it out yourself and bring it in they'll only charge you $150-$250 for the install

A shop? I am my shop; with the cost of upgrades for this thing/ would never consider letting anyone else do it.


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I did mine by hand. By myself. It was terrifying lol.

A couple years ago I bought a transmission jack on sale at Harbor Freight for barely $100. Might be a good option now and could be useful in the future :twocents:

Yea i pulled it out on my chest but had to use a motorcycle jack to install it. But i also had the quaife and oil in it.

haha yeah i had it at 87lbs with fluid, and i won a bet against a coworker once, he didn't think it was possible to pick it up, lift over your head, position it on the car on a lift and start a front bolt by hand. I got pics somewhere.

I use my floor jack. to take the Differential off and put it back on. When removing it, I removed the bolts 1/2 way then placed the jack under her. Jacked the diff up a little and twisted the rest of the bolt out by hand. All that was left is to gently pry the rear out and she is free. I think I used a strap on her to keep her secured to the jack too.

When I put here back up, I had a 2nd hand instead of strapping her down to keep the differential steady as I slid the rear in and put te 2 front bolts in.

Yeah it's heavy but not impossible. I made a youtube video on how to remove the old junk and install some Whiteline Poly bushings in a while back.

Here is the first video. There are 9 in total. It really was not that bad of a job. It's just a little messy and took like 4 hours or so. I had to stop and record a few times. Then watch the vid to see if it was any good and record again or proceed. I had another video recorded but never uploaded it. It showed where I used a paddle bit to drill the rear bushing multiple times all the way way round. I had used a spiral type and it caught and then snapped in half on the first attempt. I then proceeded to the a 8 ton bottle jack. The jack was wedged between the bushing and the main frame.Wood was used to get the jack piston to touch the rear diff bushing where I then used it to force the middle rubber part out giving me plenty of space to fit a saw blade to cut the metal ring.

https://www.youtube.com/watch?v=AAtgvAYw-8Q

YzGyz

Does anyone have the oem diff weight with the VLSD with or without oil?

I think I may have taken a pic when we tossed the oem on the scale. Let me look thorugh the albums

Sorry, was the wavetrac unit we weighed.

Last page I posted that filled with fluid a manual vlsd with oil is 87lbs.

Hey guys yes I did see that. So a question about that, are the wavetrac and quaife units about the same weight? I don't really need the whole assembly weight although I'm looking to see what the oem weight is for comparison. Even with just the lsd themselves then I can see roughly how much heavier the wavetrac lsd is over the oem VLSD.

Who cares? The best money spent on a 370z is to upgrade the diff. Who cares about how much it weighs? Some folks just way over think things.

Not everyone pursues the same aspects or qualities in their build. I respect that it wouldn't make a difference to another individual but I am asking for reasons that are important to me. I am upgrading the diff to a wavetrac unit and was looking to see the secondary benefit of how much weight would be added to rear to offset the weight of an SC up front. There was an entire mega thread where people discussed weight reduction, distribution, etc. because it was of interest to them so there are definitely people out there who care. Perhaps you have something else to contribute other than frustration? :tiphat:

I can't tell you the weight of the diff but when my car was supercharged with an OS Giken diff, I had my car corner balanced and the front weight was 2025 and rear was 1684 for a 54.5% front and 45.5% rear. That was with driver weight of 195#.

It's because any weight difference will be negligible due to the added performance of the corner exit speed you will gain with the diff. The best option is an OS Giken but you will need to add a diff cooler for it to keep it from overheating and puking diff fluid out the vent tube. When and if you get an upgraded diff installed you will see what I am talking about. It is the best money you can spend on a 370z to improve track times. As far as my frustrations, Sounds like you need a date with AOC. LMAO!!!!

Thanks for the input, you definitely have quite the heavy car. I think I would only need about 20lbs in the rear to stay at the same factory F/R distribution which I believe the difference is between diffs.

I have considered many options but after researching all my options I decided the wavetrac was what I was looking for as I was looking for something streetable and quiet.

OS Giken is streetable and quiet as long as you use the OS Giken diff fluid.

You haven't really stated what your actual goal is, other than to keep the balance of the car the same as OEM. It that is the case then just stick with the factory diff if you aren't doing any performance driving. The Z is not bad from the factory but it is not great.

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^^^^This. My OS Giken doesn't make any noise

A little bit over 3500 pounds without driver. The supercharger set up is heavy.

Mine is dead quite.

The weight difference between different LSD units is ounces. Maybe a pound at the most.

My goal with the diff itself is to improve traction of course. Mostly spirited driving with some track use. The OS Giken might be better for cornering performance and handling characteristics but I am not looking to install a diff cooler at the moment. The reason I am asking about weight is the notion that the mechanical lsd could be heavier than the factory VLSD. The weight added could be a secondary effect and not a decision maker in upgrading my diff. I just wanted to know how big that difference was. I have to keep the power planted after all. :tiphat:

Cool, that said and what has been said the difference is negligible. Even if it heavier the extra weight in the back and down low would be a positive gain. Wavetrac is an outstanding rear diff and will do what you want. I ran one in my Z and have it on the shelf a back up. What is funny about the Wavetrac is that it never overheated on the track but I got it to puke fluid on the tail of the Dragon.

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Wavetrac is definitely my choice, it is a proven outstanding unit and if I am pushing the car that hard and I see the need in the future for something better I can always upgrade my diff setup to something else down the line.

If you want to balance the car out. You have to add weight to the rear. This is done with lots of race cars. Common practice.

Wavetrac:
http://www.the370z.com/members/madwi...0-img-9900.jpg

Thanks man! This was dry weight correct?

Yes, that is the plan. I was already looking to see where I can attach some extra weight. The diff was just going to be a bonus.

yeah, dry weight.

Thanks man :tup:

I don't run a diff cooler on mine because my car isn't a track car. A diff cooler isn't needed for street use

I see, I was mainly responding to Spooler's statement. I haven't really touched the subject in a while. It seemed like a lot of members enjoyed wavetrac and quaife for street use, not sure currently. It is a bit more expensive though from what I see. Will have to do some searching.