Teraflex Extended Travel Rear Kit

[jnack]

So I'm interested in the Teraflex extended rear kit. What I was hoping to understand is why is it that the rear control arm bracket kit if you have adjustable control arms? If the adjustable rear upper control arms have already set an appropriate pinion angle why is the rear upper control arm bracket needed?

It seems that Teraflex includes this bracket with their Alpine CT3 Short Arm Extended Travel Suspension System which makes me think despite the Alpine arms being adjustable they seem to think there is added benefit to having the rear upper control arm bracket as well. I'm just not quite sure I understand suspension geometry enough to work out why it is needed....it seems odd that Teraflex is the only company to my knowledge that makes a rear upper control arm bracket.

@TeraFlex maybe you can weigh in?

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[Rusty PW]

Rock Jock makes a rear geometry correction brackets. My understanding is on extreme droop. The brackets keep the pinion angle from moving to far and causing a bind at the joint.

https://www.rockjock4x4.com/RJ-151405-103

 

[jnack]

Rock Jock makes a rear geometry correction brackets. My understanding is on extreme droop. The brackets keep the pinion angle from moving to far and causing a bind at the joint.

https://www.rockjock4x4.com/RJ-151405-103

i stand corrected. thank you! very helpful!

 

[CrazyCooter]

I generally steer away from Teraflex, but I do like those rear geometry correction brackets better than the Rockjocks.

Both of manufacturers mention pinion angle rotation as the need for the "correction", but I would think its mainly for the binding that would occur with one wheel stuffed and one wheel dropped out on the rear axle?

I've noted the forward rotation of the axle at full droop, so naturally the opposite is true at full stuff? Rigid control arm bushings will just amplify the binding and eventually break the weakest link......the axle brackets?

 

[TeraFlex]

I generally steer away from Terrajunk

My understanding is on extreme droop. The brackets keep the pinion angle from moving to far and causing a bind at the joint.

This is absolutely correct. The rear axle brackets are to help maintain the best possible driveshaft and pinion angles during suspension down travel. If long shocks/tall coil springs are used without correction brackets, bad things happen to the driveshaft and related parts.

 

[CrazyCooter]

FYI, those Teraflex rear correction brackets are nice and fit well!

Put them on this morning and noted the pinion rotated up 2° with my 3.25" lift to match the transfer case output angle.

Also installed their rear track bar relocate. I cut the top mounting hole off so I didn't need to set my bumps so low giving up wheel travel. Not sure what I'll do should I decide install the rear axle truss later on since the bracket occupies that space on the driver side.

Nice job @TeraFlex on those!

 

[jnack]

FYI, those Teraflex rear correction brackets are nice and fit well!

Put them on this morning and noted the pinion rotated up 2° with my 3.25" lift to match the transfer case output angle.

Also installed their rear track bar relocate. I cut the top mounting hole off so I didn't need to set my bumps so low giving up wheel travel. Not sure what I'll do should I decide install the rear axle truss later on since the bracket occupies that space on the driver side.

Nice job @TeraFlex on those!

so basically no difference between your driveshaft and pinion angle at ride height?

 

[CrazyCooter]

so basically no difference between your driveshaft and pinion angle at ride height?

The driveline angles was tilted upward from where it was without the geometry kit. I can't remember how many degrees, but the vibration I was feeling at 50mph is gone. The suspension also travels more freely. Highly recomend.

Edit.....I see my prior post....2° so maybe I dont understand you question.

 

[vst]

Do you need extended travel shocks for this kit?

 

[CrazyCooter]

Do you need extended travel shocks for this kit?

You don't "Need" them, but the more free moving suspension will allow taking advantage. Prior to the kit, my 28.5" shocks were all that could be utilized due to the binding of the links, but now I could run a much longer shock assuming I had enough brake hose.

 

[jnack]

Do you need extended travel shocks for this kit?

i upgraded to the falcon 3.3s that got to about 32" extended, it really doesn't make sense for you to run the full kit if your shocks are going to limit the travel...it's called extended travel for a reason

 

[jnack]

The driveline angles was tilted upward from where it was without the geometry kit. I can't remember how many degrees, but the vibration I was feeling at 50mph is gone. The suspension also travels more freely. Highly recomend.

Edit.....I see my prior post....2° so maybe I dont understand you question.

i'm more so interested in the angle between the pinion and the drive shaft at the rear axle. i think you had mentioned you were able to match the transfer case to your pinion angle

 

[CrazyCooter]

i'm more so interested in the angle between the pinion and the drive shaft at the rear axle. i think you had mentioned you were able to match the transfer case to your pinion angle

I didn't write the operating angle down as its kind of irrelevant. All I can tell you is that it is probably higher than stock even with my carrier bearing drop and was reduced 2° from before I installed the kit.

 

[CrazyCooter]

i upgraded to the falcon 3.3s that got to about 32" extended, it really doesn't make sense for you to run the full kit if your shocks are going to limit the travel...it's called extended travel for a reason

This kit actually does make a difference whether you have the longer shocks or not. It reduces binding which relieves the twisting loads off of the control arm bushings, brackets, and axle housing. I would prioritize the geometry kit higher than replacement control arms unless you are running an aftermarket CV driveline and need to dial the angle in.

 

[RodRecket]

This kit actually does make a difference whether you have the longer shocks or not. It reduces binding which relieves the twisting loads off of the control arm bushings, brackets, and axle housing. I would prioritize the geometry kit higher than replacement control arms unless you are running an aftermarket CV driveline and need to dial the angle in.

It's the same concept as the geo correction brackets for the front control arms, correct? I understand what you are explaining in your post but I'm wondering if the lowers matter? These brackets don't move the lower rear control arms because the up travel is already limited by bump stop? So moving the rear LCAs isn't as important as changing the geometry for the uppers?

That's a lot of question marks @TeraFlex

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