Difference in Off Road vs TRD Pro Springs and when control arms need to be swapped

I have been searching for a few weeks to get the answers to my two questions below. Since these are fairly new trucks, not a lot of info out there compared to older Toyota vehicles where people have worked all kinds of suspension options.

I believe the TRD Pro springs are 2.5" taller in the front and 1" taller in the back than the Offroad springs. Not sure if the Trailhunter is the same as the Pro.

On the Land Cruisers I have had, I have been able to swap springs as I add armor to offset the lift with a little extra lift. It depends on the range of the shocks if those need to be swapped with springs. For example, on my 200 series, I am running the OME BP51 setup. When I added a rear 13 gallon aux fuel tank I swapped the springs from 2" to 3" to offset that along with my storage drawer of tools and carrying two spare tires.

I have Sliders and plan on the full size ARB bumper in the front when it comes out in spring. Later on possibly a rear bumper and who knows what else.

I know there are lots of lift options out there, right now I am only asking about Toyota springs. The other options are well described.

The Wescott lift provides some lift with essentially less spring so the shock travel must be able to handle that. They also don't require new control arms. I don't care for this option is it provides less spring motion.

So two questions here:
Validate the differences between Toyota Off Road and Pro OEM spring heights

And

At what point are new control arms needed? I know it is travel response. Not sure how the Off Road vs Pro control arms perform and what there recommended limits are.

I may swap shocks basedf on performance and travel, but that is a subject for another day

Thanks in Advance.

 

There's 2 part numbers for TRD front springs

PTR63-35320 & PTR63-35310

One could assume that one of these springs is stronger than the other, or maybe one is left and the other is right?

Nobody knows!

And if you want a good laugh, call the parts counter and ask!

Because they don't know either.

Then there's a part number for a TRD Upper Left Control Arm

PT901-35241

Of course, whether that means driver side or passenger side is also anyone's guess.

And then, how many more degrees of articulation the joint makes over the nonTRD UCA is also anyone's guess.

It would be really helpful if Toyota maybe had this info on their sites where you can order them but that would just be the logical approach and nobody does that anymore.

Like, why is there not a part number for a Right Upper Control Arm? Is the thing symmetrical, and we just flip the joint upside down?

For $542.85, you, sir can be the first to find out!

Because of these things, it will be very hard to get answers to questions like this on a forum.

We are all stuck with the same lack of information and these trucks have been out for a year now!

Perhaps looking at Icon or King's information on their kits, one might be able to deduce the OEM stock specs for these items.

Please share if you find out anything!

A lot of people are stuck on the fence with these details

 

i wouldnt doubt that the springs are not interchangeable from OR to pro. the front strut spring seats are prolly different seeing as the pro shocks are so much different than the OR.

 

Historically you've been able to install TRD Pro shocks on any model of the same generation, SR through TRD Offroad. I suspect 4th gen TRD Pro Front Shocks will even fit a 4th gen SR. With the 2.5 inches of lift though, it might be hard to get the alignment perfect with the non TRD Pro upper control arms.

Now for the length of springs/shocks, it's anyone's guess, but generally shocks have a 2 to 1 movement ratio, so maybe TRD Pro shocks are overall 1.25 inches longer? lots of variables.

 

yes i understand that you can put pro fox shocks on any taco.

 

I found one of Tinkers great videos on UCAs. Essentially, he says that if the lift is 2" or less and you get good alignment, there isnt any value in upgrading UCAs.

He discusses lift as net lift and it doesnt matter if it is based on springs, spacers etc.

The Wescott lift gives 2.5" of lift which would imply the stock UCAs are fine or am I missing something here?

I would expect with Sliders and a 100lb front ARB bumper that I will see some droop in the lift. I already have the sliders but will have to measure before and after with the bumper

https://www.youtube.com/watch?v=huMztKaHsUE

 

why dont you just buy higher rate springs? doesnt tinkerer not advocate for any pre load spacers or strut tower spacers?

 

my first thought is to stick with Toyota and have them put them on at the dealer. That way any issues caused by a lift would not impact my warranty (Have 10 year)

I am only looking at springs and agree with Tinker

Not a must do, I can certainly swap aftermarket springs on and see how they go.

Just trying to understand the options within the OEM parts and if the TRD Pro springs would work

Being an engineer I tend to evaluate options, build spreadsheets and then make my choice. The info on aftermarket parts are more avaailable on what they do since they want you to buy them

So researching first with Toyota products and then will look elsewhere. It will be a couple of months until I have the bumper, so in no big hurry.

Also, since the info on Toyota parts isnt easy to find, would be helpful to others I am sure

 

I believe the diameter of the TRD Pro shocks is larger, so the spring diameter is probably larger also- doubt you could install TRD Pro springs on the regular TRD shocks

 

No guessing there at all. The sides of the vehicle are always given with reference to the seated position or the nose of the vehicle as the 12 o’clock.