RUF front leaf setup & ride tuning

Rear-Up-Front (RUF) leaf springs are a budget-friendly way to get longer front springs, more flex, and a few inches of lift on an older Toyota. This page covers how you approached RUF on your ·85 4Runner, why you did it, and what it took to get the ride height and comfort dialed in.

Why RUF instead of custom springs?

Using rear leaf springs up front on Toyotas is a common mod to allow a longer front spring while keeping costs low. One of the big advantages is that it opens up almost unlimited options for spring combinations using factory or junkyard packs. The trade-off is that it usually takes a few tries before you get the ride height and spring rate where you want them.

A fresh set of custom front springs from a reputable manufacturer will almost always perform better straight out of the box · but they·re also far more expensive. With a limited budget, cost is a major factor in your modifications, so RUF was a way to gain performance without dropping custom-spring money.

Where the springs came from

RUF often starts after you upgrade the rear to a longer spring. In your case you swapped the rear to a 58" F-150 pack, which freed up the original rear 4Runner packs as ·spare parts.· Those became the foundation for the front.

On your rig you used the original spring packs from an ·85 4Runner and mixed in a few leaves from a third-gen pack. This combo gained a few inches of lift and, thanks to the longer overall length, noticeably more flex up front.

What has to move: hangers & shackles

Running RUF up front isn·t just a simple bolt-in. The longer spring means:

The front spring hanger needs to move forward several inches to keep the axle in the right spot.
Shackles usually need to be longer to get the correct shackle angle and droop.

The exact measurements will vary from build to build depending on:

Desired ride height
How much up-travel vs. down-travel you want
Weight of bumpers, winch, cage, and other front-end gear

Trial-and-error tuning

RUF tuning is very much a trial-and-error process. Individual leaves may need to be added or removed from the pack to get the spring rate and height where you like them. On your 4Runner this took several iterations before you were happy with both ride height and comfort.

Once dialed, the setup flexes well on trail and soaks up bumps decently for your driving style · not as perfect as a high-dollar custom spring pack, but ·good enough for the moment given the cost invested.·

Shocks & flex travel

Longer springs and more droop almost always mean your old shocks are going to be too short. Plan on:

Selecting shocks with enough travel to match the new flex
Checking for binding or topping out at full droop and bump
Possibly relocating mounts to get the most from the new spring length

Trail behavior & comfort

In real use the front RUF setup on your 4Runner:

Flexes noticeably better than the original stock-length front leafs
Rides comfortably enough for your preference on trails and backroads
Works well in combination with the long-travel rear suspension

It·s a budget-minded solution that performs well once tuned, and it leaves the door open for custom springs later if you ever decide the cost is worth the improvement.