Jeep KK Front Differential Drop

[Damwan]

Question for the masses,
Does anyone know if the rear mount on the front differential rotates?

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[lfhoward]

I don’t know the answer to your question, but am curious why you want to drop the front differential. If it is because you are worried about CV angles with a lift, you needn’t be concerned. I have been running a 4” lift since 2012 (140,000 miles plus) and my CV’s have been fine. The lifted angle is no worse than the angle in the up direction that the CV’s were at with the sagged stock suspension before I lifted it.

 

[Damwan]

I don’t know the answer to your question, but am curious why you want to drop the front differential. If it is because you are worried about CV angles with a lift, you needn’t be concerned. I have been running a 4” lift since 2012 (140,000 miles plus) and my CV’s have been fine. The lifted angle is no worse than the angle in the up direction that the CV’s were at with the sagged stock suspension before I lifted it.

Full disclosure,
Yes I am worried if I do lift the jeep 3-4". Building a coilover lift system modelled off the KK prerunner setup. Just doing some research.

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[lfhoward]

I have seen the diff dropped on YouTube and such, but the guys on the forum who ran 4” lifts for 10 years or more, and who really wheeled their KJ’s and KK’s, didn’t need to do that.

The coilover setup is nice. I am running one (JBA 4” lift), which unfortunately is not made anymore. It would be good to have a real option for coilovers again. Definitely interested in your project.

 

[lfhoward]

Here’s a thread with info I’ve collected on the JBA coilover lifts:

Rebuilding JBA Adjust a Struts - part numbers

A number of folks (like me) are running Jeepin By Al’s adjust a strut lift kits. JBA stopped supporting or making these a few years ago. The question periodically comes up, what happens if I need to repair one of the units? The coilover shock itself is a Bilstein. A member over on Jeep Forum...

www.jeepkj.com

 

[Damwan]

D

Here’s a thread with info I’ve collected on the JBA coilover lifts:

Rebuilding JBA Adjust a Struts - part numbers

A number of folks (like me) are running Jeepin By Al’s adjust a strut lift kits. JBA stopped supporting or making these a few years ago. The question periodically comes up, what happens if I need to repair one of the units? The coilover shock itself is a Bilstein. A member over on Jeep Forum...

www.jeepkj.com

Did you ever get a chance to measure your rear springs?

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[lfhoward]

D

Did you ever get a chance to measure your rear springs?

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No, I just posted that last night. But I will see what I can do by this weekend.

 

[Damwan]

No, I just posted that last night. But I will see what I can do by this weekend.

This is my Draft Suspension Mod build sheet for 3" + lift. Still need to do a bit of research and calculations.

Front Coilover Mod

Brand: QA1
Manufacturer's Part Number: DD501
Part Type: Coilover Shocks and Struts
Product Line: QA1 Proma Star Coilover Shocks
Summit Racing Part Number: QA1-DD501
Coilover Shock Type: Double-adjustable
Extended Length (in.): 16.88
Collapsed Length (in.): 11.63
Body Diameter (in.): 2.000
Recommended Spring Diameter (in.): 2.50 in.
Recommended Minimum Spring Length (in.): 12.00 in.
Recommended Maximum Spring Length (in.): 12.00 in.

Rear Shock

Brand: Bilstein
Manufacturer's Part Number: 33-185552
Lifted Amount Range (in.): 0.00-2.00 in.
Extended Length (in.): 25.93
Collapsed Length (in.): 15.91
Body Diameter (in.): 2.000


Rear Springs

Brand: Eibach
Manufacturer's Part Number: 1400.300.0250S (tentative)
Coilover Spring Inside Diameter (in.): 3.000 in.
Recommended Minimum Spring Length (in.): 14.00 in.
Recommended Maximum Spring Length (in.): 14.00 in.
Coilover Spring Rate (lbs/in): 250 lbs./in.