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On a related note, the socket flange on the drive shaft that fits this transfer case output flange is a bit of a special thing nowadays. It is an old design ford flange that was adopted as an aftermarket part, it used to be really common. However, a couple years ago, Spicer decided to raise the...

We did, but we used slightly different parts than Currie. The seal we used was a 8695S. But the OD on this was slightly larger, 2.690". To make this work we would machine the housing to fit the different seal. All of this was so long ago that I barely even remember what we used to do and don't...

I just re-read the original post and want to answer that post more concisely and directly. 1) Will the HD 1310 rear driveshaft bolt up to the stock yoke on the Dana 44 rear or will I need some sort of adapters? Yes, a 1310 series shaft will bolt directly to your stock rear pinion yoke. 2) I...

First I want to verify that "Stock" in this conversation means no suspension lift, right? That's my assumption but I frequently talk to people who say their vehicle is "stock" even though it is lifted or otherwise modified. This type of shaft, the type posted above by @cpwolf, could indeed be...

We just added a new video to our tech page about diagnosing drive shaft vibrations. Take a look at the tech page, watch the video, check out the RPM calculator, tell me what you think! What if any questions are you left with after reading and watching the info we've provided...

Oh, okay. When I say you need a double cardan shaft I am talking about the rear shaft. The rear shaft is the one that is most affected by the lift, in terms of operating angle, and is the one that would be causing the low speed vibration as a result.

A double cardan on the front shaft or a double cardan at the front end of the rear shaft?

Watch the first 3 minutes of this video. Really you should watch the whole thing, but the first 3 minutes will show you the effect of lift on drive shaft angles. The angles are what are causing the low speed vibration. In the video we are demonstrating how a 3" lift affects angles, I know yours...

@Claybirdd I can tell from the photo that you have an advance adapters SYE housing. Someone definitely swapped the standard yoke for a flange. I don't recognize the flange and can't identify the source of it though. For posterity, for people who are wondering whether or not they have an SYE or...

@pagrey seems to be right about you having a rubicion transfer case. But as far as I can tell from the photos all the joints are 1310 series. 1310 series would not be the stock size on the front output yoke of the transfer case, 1330 would. You for sure should measure things on the front. The...

Post a picture of the whole shaft so I can see the part where it compresses and extends.

I personally like the quality and design of the Advance Adapters SYE over all others. The JB Super Short is high quality and well designed but I think it is overly-complex for most applications. There's the issue with the speedometer being electronically driven instead of mechanically driven...

I agree with everyone else that the drive shaft and death wobble are two separate issues. That's often the case with Jeeps, if the previous owner neglected one thing or did something weird with one thing, the probably neglected and/or did something weird with another thing. I wonder if there is...

Neapco at least lists ultimate strength in newton-meters in their info but there are no numbers! It's just (read in caveman voice) "This graph bigger, this one better". I found the old information that our old Dana/Spicer rep sent me when I asked him for clarification on this topic. In the old...

Yes, I believe that they are stronger. You can easily find 100 people who will tell you that non-greaseable joints are stronger, including me. What you won't find is a single person who can tell you how much stronger they are, including me. Spicer and Neapco has some "information" on this but...

This post also inspired me to start on something that I've wanted to do for a long time. To do a cross section comparison of a greaseable and a non-greaseable joint. Tonight I cut a couple joints in half. I'm going to do a bunch of comparative measurements, take some good pictures, and make it a...

In many ways I do think that the non-greaseable joints are a better option for most people. One thing I don't like about non-greaseable joints though is that they often trick people into thinking that they have a non-greaseable and therefor maintenance-free drive shaft. As a result they will not...

Maybe I'm wrong in my previous post where I said it won't fit. I assume if they sent you a boot for a shaft they made it will fit. I don't recognize the boot though, it looks like a stock replacement to me. When people say it will fill up with mud and water, that is only if you tear the boot...

From our website, XB = Boot, XC = Cap (dust cap, what the OP has now) "With the XB configuration, we will use a heavy rubber boot which is banded down with stainless steel banding to seal all of the contaminates out and keep the grease in. The XC configuration uses the same slip yoke & spline...

I'd like to take a moment to acknowledge how funny it is that the OP asked "4.56 or 4.88?" and now we are 5 pages deep discussing physics/mechanics. It makes me imagine a situation in which someone askes Neil deGrasse Tyson "What time is it?" to which he replies "To answer that question we first...