Lots of info here. Thanks!
CK5
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How much front driveshaft slip?
- Thread starter Mastiff
- Start date
Flex test. Driveshaft is good. Truckasaurus flexes like a mobster.
@4wheelinfury Oh I see now, you are cheating with a limit strap. 
Are you maxed out on your shock stroke there? If not, what happens if you unbolt the limit strap? Do you use all of your upstroke on the other side during that flex test? Just curious. My shackle gets way more linear with the spring under full droop but I am not limiting it with a strap and have my shocks setup for 9" of droop close to the factory location.
Are you maxed out on your shock stroke there? If not, what happens if you unbolt the limit strap? Do you use all of your upstroke on the other side during that flex test? Just curious. My shackle gets way more linear with the spring under full droop but I am not limiting it with a strap and have my shocks setup for 9" of droop close to the factory location.
Geez can't please you can I. The guy who builds drive lines for a living and is a four wheeler himself was right. Shock!
I don't need more slip than that and I would question if many of us do.
That is great articulation. I actually maxed out the ramp but couldn't get a good pic as I had to stay in the truck.
Yes, the shock was maxed. It is a 14 inch travel shock and was bottomed out on the stuffed side.
The limiting straps are to protect the shock and brake line.
I just post this to prove that the slip didnt extend as much as people thought it would. I was surprised myself but the articulation was great
I don't need more slip than that and I would question if many of us do.
That is great articulation. I actually maxed out the ramp but couldn't get a good pic as I had to stay in the truck.
Yes, the shock was maxed. It is a 14 inch travel shock and was bottomed out on the stuffed side.
The limiting straps are to protect the shock and brake line.
I just post this to prove that the slip didnt extend as much as people thought it would. I was surprised myself but the articulation was great
First off, I like your truck and I think you did a great job. I am not criticizing it or you in any way.
How could any of my above questions offend you? These are legitimate questions. Sorry, I am not just going to take partial information or pictures at face value.
So, just to be clear, you maxed out the ramp but couldn't get out of the truck so you don't know how much spline was engaged when the ramp was maxed out? Also, what if you had a bigger ramp? Since you maxed that one out you didn't necessarily reach the limit of the suspension, right? (Edit: you and I have different definitions of maxing the ramp out. I thought you meant you went all the way up the ramp without lifting a tire)
You also haven't accounted for any pinion rotation or any other non parking lot factors that might happen on the trail.
Nothing wrong with running the limit strap, that is a great fix for you, who knows I might run one myself at some point but not ALL of us run them or need to run them and that is a contributing factor to the amount of slip needed don't you think?
Again, like the truck, like everything you've done with it, and yes I like you too, but I also like to know the complete and total "picture" on something before I make a concrete conclusion.
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Didn't know it was going to be limited with a strap, that obviously plays a role in all of this.
You could very well be ok with that strap & d-shaft setup, some trail time will prove that one way or the other.
How did the CV handle it?
You could very well be ok with that strap & d-shaft setup, some trail time will prove that one way or the other.
How did the CV handle it?
Cv was fine. Something is gonna have to limit the flex and I would rather it be the strap. The brake lines are long and the shock is 14 inches. It was closed to maxed.
Of course you can always go more and get more flex, but I posted this to question the notion that the slip I had was not enough. For those the guy who owned the ramp visualized he splines when I was maxed and he saw I was still fully engaged.
To necessitate an 8 inch slip would require crazy crazy long shocks. I doubt many are approaching the sort of flex that might need it and think the extra money spent of crazy slip shafts could be spent elsewhere.
Bottom line, for our trucks with 52" springs and moderate work the shaft will not need as much slip as you think.
Your results may vary but I consider my truck to be fairly built, the articulation to be high and 4 inch slip was fine for me
Looks great man. Nothing wrong with straps. I wish I had access to a ramp so I could see if I needed some. I was okay with the suspension hanging, but I know that doesn't tell the whole story.
Yep nothing wrong with straps.
I don't have 52s I have 56s so there are lots of differences in your setup and mine.
In all reality if a couple limit straps can cut your driveshaft cost in half and only limit you a small amount they are a great idea.
I have long adhered to the idea you can have too much flex. Especially when your talking leaf springs.
I don't have 52s I have 56s so there are lots of differences in your setup and mine.
In all reality if a couple limit straps can cut your driveshaft cost in half and only limit you a small amount they are a great idea.
I have long adhered to the idea you can have too much flex. Especially when your talking leaf springs.
Here you can see I was maxing the ramp out and my flex. Rear tire staring to come up. If you look closely the slip isn't even showing splines.
Were there just a bunch of posts that got deleted somehow?
Yeah that was weird, lost several posts....
Think site was down for a bit, may have done a restore...
Ok, reposting the lost post now
When I setup my front suspension using 52s it looked like this at simulated "full" droop
Now that was as far down as I could push the one side and it was a full pack, i didn't even strip it down to a single main leaf. I also wasn't pushing up on the other side any and there is no wheel and tire combo (~180lb) pulling down on it at all.
My numbers were as follows. "Full" droop was 43.5", ride height was 39", "full" bump was 37.5", I wanted at least 2" of spline engaged at "full" droop and at least 1" of buffer at "full" bump.
Tell me how much slip I need . . .
When I setup my front suspension using 52s it looked like this at simulated "full" droop
Now that was as far down as I could push the one side and it was a full pack, i didn't even strip it down to a single main leaf. I also wasn't pushing up on the other side any and there is no wheel and tire combo (~180lb) pulling down on it at all.
My numbers were as follows. "Full" droop was 43.5", ride height was 39", "full" bump was 37.5", I wanted at least 2" of spline engaged at "full" droop and at least 1" of buffer at "full" bump.
Tell me how much slip I need . . .
4" is enough
Nah, you could get away with 2 inches. 
. Lol
. Lol
Aw man mine went away too.
Anyway different setups yeild different results.
I have 56s and my shackles at full droop are dang near inline with my springs.
I have 2.5" for up, I use 5" from ride height to full droop, 2" of spline engagement, 1.5" allowed for axle wrap.
Which is why I say measure first. No matter what.
I do like extra though. I have seen pics with my main leaf bending alot. It usually comes out OK but that really causes the axle to move. I could probably get away with 7" of slip. But there would be no room for any problems
Anyway different setups yeild different results.
I have 56s and my shackles at full droop are dang near inline with my springs.
I have 2.5" for up, I use 5" from ride height to full droop, 2" of spline engagement, 1.5" allowed for axle wrap.
Which is why I say measure first. No matter what.
I do like extra though. I have seen pics with my main leaf bending alot. It usually comes out OK but that really causes the axle to move. I could probably get away with 7" of slip. But there would be no room for any problems
Here you can see I was maxing the ramp out and my flex. Rear tire staring to come up. If you look closely the slip isn't even showing splines.
Could you post up the cast numbers on the new shaft....I want to see what they used.
