How much carrier bearing spacer for a 3.5” lift?

[JTL21]

So it seems there are 2 main options for carrier bearing spacers. There’s the Rockjock @ roughly 3/4” and Rock Krawler @ over 2”. I see a lot of people recommend installing one to help with pinion angles post lift but my question is which one is the best option for a 3.5” lift?
I haven’t installed the lift yet so I’m trying to accumulate as much of the things I’ll need to make everything work as it should before I start installing it all. I’m not sure how much spacer is needed for this much lift. Does anyone have a scientific method to figure this out?

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[kevman65]

I have a Rock Krawler 3" lift, I went with their big spacer.
Set their rear upper arms to the length they specified (lowers are a fixed length) and when I was done and all the tires on the ground the pinion was where it was supposed to be.

 

[RodRecket]

I spoke to a rock krawler tech when ordering the 3" silverback system as i have a 3/4" spacer on now and this was his response:

Our drop bracket is not required until 4.5" of lift. A smaller drop bracket can be beneficial for 3" kits. Our drop is too much for the 3". Our drop is 2 3/16 inch so if yours is a little less I would leave it.

 

[Camaroboi13]

I’m somewhere near 4” in the rear and I did the rock jock spacer.

 

[Sikjeep2]

I have a 3.5" lift and running the Rockjock spacer.

 

[Rusty PW]

I have the Clayton 3.5" springs in the rear. Got about 4" of lift. Using the Rock Jock spacer. With the control arms adjusted to the Clayton specs. Everything looks fine.

 

[smlobx]

I have the AEV full suspension upgrade with about a 3” lift. I went this route because everything was designed to go together.

The kit included 3 shims which amounted to about 1, 1/8” total

 

[JTL21]

Thanks for everyone’s responses. Now I’m wondering how do you know if you have too much spacer?
I’m going with the Clayton Overland+ 3.5” and given that I won’t have a bunch of added weight I’ll likely get a little more than 3.5”. I saw both spacers on sale at Northridge this morning. Is it bad if I go with the larger Rock Krawler one?

 

[Escape.idiocracy]

Thanks for everyone’s responses. Now I’m wondering how do you know if you have too much spacer?
I’m going with the Clayton Overland+ 3.5” and given that I won’t have a bunch of added weight I’ll likely get a little more than 3.5”. I saw both spacers on sale at Northridge this morning. Is it bad if I go with the larger Rock Krawler one?

Non issue- gotta think some dudes ditch the two piece rear driveshaft in favor of a single…. Which to me if you are flexing enough to justify a single piece your in the big leagues anyway….

Im at 3” rear and have the rockjock. No noise before or after- just thought the spacer couldent hurt anything, and might help with the bearing life

 

[GladiatorPilot23]

I just bought a billet full width Spicer spacer new from an ebay seller.

https://danaproparts.com/i-30497779-spicer10149071driveshaft-center-support-bearing-spacer.html?ref=search:https://danaproparts.com/search.html?q=spicer+spacer&go=Search#wsm-prod-tab-docs

It says 2" or more and Ill go with them on the info as they are the OEM supplier. In my case I ordered the Accuair Suspension and it can go as high as 5.5" at 25MPH or -X.X" .

Also worth noting is I rear shocks also play a roll. I forgot the number but around 28" or more so overall length.

 

[JTL21]

I just bought a billet full width Spicer spacer new from an ebay seller.

https://danaproparts.com/i-30497779-spicer10149071driveshaft-center-support-bearing-spacer.html?ref=search:https://danaproparts.com/search.html?q=spicer+spacer&go=Search#wsm-prod-tab-docs

It says 2" or more and Ill go with them on the info as they are the OEM supplier. In my case I ordered the Accuair Suspension and it can go as high as 5.5" at 25MPH or -X.X" .

Also worth noting is I rear shocks also play a roll. I forgot the number but around 28" or more so overall length.

Thanks, that is very helpful.
One question though, how thick is the Spicer? I didn’t see dimensions in the description.

 

[Vtur]

Thanks, that is very helpful.
One question though, how thick is the Spicer? I didn’t see dimensions in the description.

I have the the Spicer and it's 1" inch thick.

Edit: It's also pretty easy to make one out of some square T6 aluminum stock. Just cut to length and drills 2 holes.

 

[JTL21]

I have the the Spicer and it's 1" inch thick.

Thank you!

 

[GladiatorPilot23]

Thanks, that is very helpful.
One question though, how thick is the Spicer? I didn’t see dimensions in the description.

Glad someone mentioned the 1" I would have posted as soon as I received.

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