Rough Country 7594 vs TeraFlex 1905122: TJ Coil Spring Spacers

Published 10 September 2026

These two parts solve the same problem on a TJ, a nose that sits lower than the tail. They go about it a little differently. Rough Country sells a matched front pair, and TeraFlex sells one spacer at a time for either axle.

TeraFlex's spacer is also a quarter inch taller on paper. That extra height depends on one detail, the factory rubber isolator. It's covered below.

At a glance

What each part is, and the problem it solves

TeraFlex's own instruction sheet names the problem: "The rear of many TJs sits higher than the front." A spacer on top of each front coil raises the nose and brings the body closer to level. That is the whole job.

Rough Country 7594 is a pair of spacers sold for the front only. Rough Country calls it a "Precision 1.75-Inch Front Lift" that "Levels the stance."

TeraFlex 1905122 is a single spacer that "Fits front or rear coil springs." TeraFlex pitches it to "level out a loaded vehicle," and says it suits a Jeep at stock height or already lifted. Because you buy them one at a time, you can fix one low corner without touching the others.

Fitment, side by side

Neither maker publishes a "will not fit" note for any TJ or LJ trim. TeraFlex's only fitment condition is the isolator. Rough Country's only note is to read the product page.

TeraFlex does print a warning about combining parts. Its sheet says adverse handling and driveline angles "may result when combining 1.25 or 1.5-inch spring spacers with aftermarket lifts." It adds that any spacer used with a TeraFlex suspension system voids the warranty on TeraFlex springs.

Specs and construction

Neither maker names its material on its own page. The distributors name different plastics for each part, so treat material claims as unconfirmed on both.

What's in the box

Rough Country 7594: two spacers, no hardware. RC confirmed "a pair of 2 spacers" in its product Q&A.

TeraFlex 1905122: one spacer. Quadratec lists the contents as "1 Coil Spacer."

Don't be misled by the TeraFlex install sheet. It is written for the TJ 1.5-inch Budget Boost kit, part 001341200, with four spring spacers, bump stop extensions (1.5 in. tall front, 2 in. tall rear) and bolts. None of that ships with a single 1905122.

Install compared

The work is the same for both. You support the Jeep on the frame, drop the axle, pull the coil, fit the spacer above it, and reassemble. No drilling, cutting or welding is needed for either.

TeraFlex publishes steps, but for the kit. Sheet 999117 has you remove the shocks and pull the rubber bump stops, then remove the bolt inside each bump stop cup with a 15mm socket. The springs come out and go back "placing black spring spacers above the springs."

Rough Country publishes no steps at all for 7594. It gives only the time: "1-3 hours," described on its 2013 page as the average for "a professional shop or mechanic."

The time figures disagree a lot. TeraFlex does not explain why its figure is higher than the distributors' figures.

What it changes on the Jeep, and what else you'll need

Neither maker calls for a track bar, shock extensions or longer sway bar links with these spacers. At this height the stock parts stay. The geometry still shifts.

The front axle ends up further from the frame. That steepens the track bar and nudges the axle sideways, and the TeraFlex spacer's extra quarter inch moves things slightly more (what a lift actually breaks has the full list).

Bump stops are the part TeraFlex quietly acknowledges. Its own kit pairs spacers with bump stop extensions. If you buy 1905122 or 7594 alone, you get none, so the axle can travel further before it stops.

For tires, only Rough Country publishes a limit: 30x9.5, and its Q&A declined 31x10.5. TeraFlex publishes no tire size for 1905122.

Warranty and support

TeraFlex: its current warranty page gives lifetime coverage to "coil springs, bump stops, control arms, track bars, sway bars & links and IR bushings." It does not name spacers. ExtremeTerrain lists a twelve-month warranty.

TeraFlex's older 999117 sheet warrants "TeraFlex Suspension products" for as long as the original buyer owns the vehicle. It excludes finish, racing, abuse, and failures from larger tire and wheel combinations. TeraFlex support is 801-713-3314.

Rough Country: distributors list a "Limited Lifetime Warranty." RC's archived warranty page covers "Hard Suspension Components" for life and wear items for one year, without saying where a spacer fits. It excludes removal and install costs.

Neither warranty is spelled out for a spacer. Keep the receipt, and ask before you buy if coverage matters to you.

Owner reports

These are owner reports, not specs. TJ forum threads on both parts were behind bot walls when we checked, so these come from retailer reviews and owner videos.

• TeraFlex 1905122, death wobble (owner report): "Easy enough to install...But...experienced 'Death Wobble' at about 60 mph." (Robby M., Quadratec, 3 stars, 12/3/2018.) It is one report, and it does not say what else on the Jeep was worn. See death wobble on a TJ.
• TeraFlex 1905122, general: 5.0 stars from 5 reviews on ExtremeTerrain. Quadratec reviews include "Great product" (Mike R., 2023) and "Easy To Install" (2021).
• TeraFlex-style 2 in. spacers on a TJ (owner video): BSK Garage fitted "2" coil spacers to bring the height up in the front" after a spring swap left the TJ nose-low. The brand isn't named in the description.
• RC 7594, overall: 4.5 of 5 stars from 75 ratings on Amazon.
• RC 7594, compression (owner report): "The flat on the one side has already started giving in to the spring after only a short time." (Audrey, Amazon, 2024-05-31.)
• RC 7594, height (owner report): "There's still a slight rake... I would recommend 2 inch spacers." (Cole, Amazon, 2024-03-02, on an RC 4 in. lift.)

That last report points at the real difference between these parts. If 1.75 in. doesn't fully level your TJ, the TeraFlex spacer's extra quarter inch is the fix.

Who should buy which

Buy the Rough Country 7594 for a straightforward front level on a budget. The pair is $49.95 MAP, less than two TeraFlex spacers. It also comes with a published tire limit.

Buy TeraFlex 1905122 if you need to fix one corner, the rear, or a TJ that's more nose-down than usual. Sold each, it lets you correct a single sagging spring. TeraFlex pitches it to "level out a loaded vehicle," which is where the extra quarter inch earns its keep.

Buy neither if you're chasing tire size. Two front spacers won't make room for bigger tires on their own. TJ lift kits compared sets out the real options.

FAQ

How many TeraFlex 1905122 spacers do I need?

Two per axle. TeraFlex sells 1905122 individually at $32.99 each, so a front pair is $65.98 at TeraFlex's September 2026 price. Rough Country 7594 comes as a pair.

Does the TeraFlex spacer really give 2 in. of lift?

Only with the factory rubber isolator left in place. TeraFlex says it must be used with the factory isolator to gain the advertised lift. Quadratec and ExtremeTerrain say it gives 1.5 in. with the isolator removed.

Can either spacer go on the rear of a TJ?

TeraFlex says 1905122 fits front or rear coil springs. Rough Country sells 7594 as a front pair, and Quadratec's listing says rear use is not recommended.

Do the TeraFlex instructions include bump stop extensions?

The instructions TeraFlex links, sheet 999117, are for its TJ 1.5-inch Budget Boost kit, which includes front and rear bump stop extensions. A single 1905122 spacer does not include them.

Sources

1. Rough Country 7594 product page (Wayback capture, 13 May 2026)
2. Rough Country 7594 product page (Wayback capture, 2013)
3. Rough Country warranty page (Wayback capture, October 2025)
4. TeraFlex 1905122 product page
5. TeraFlex 999117 TJ 1.5-inch Budget Boost instructions
6. TeraFlex warranty page
7. Quadratec: TeraFlex 1905122 listing
8. ExtremeTerrain: TeraFlex 1905122 listing
9. Quadratec: Rough Country 7594 listing
10. ExtremeTerrain: Rough Country 7594 listing