Are Jom Coilovers Bolt on in an E34 Bmw? Fit Guide

Yes — are JOM coilovers bolt on in an E34 BMW? In short, they are: JOM builds its E34 kits around the factory strut and rear axle design, so the units install into the original top mounts and lower perches without cutting, welding or fabricating brackets.

But "bolt-on" deserves a closer look. A 25-year-old chassis brings rusted collars, tired top mounts and seized adjuster rings into the job, and the ride you end up with depends heavily on setup rather than the kit itself.

This guide covers exactly what bolts where, which JOM variant suits your E34, a full installation sequence with torque figures, realistic drop numbers, and the mistakes that turn a straightforward weekend job into a week of frustration. Everything here assumes hand tools, a spring compressor and a garage floor — no specialist equipment required.

Are Jom Coilovers Bolt on in an E34 Bmw: The Short Answer

JOM coilovers are a genuine bolt-on fitment for the BMW E34 5 Series. The front units use a threaded sleeve that slides over the factory strut cartridge location and clamps into the original knuckle, reusing the car's upper top mounts. At the rear, the adjustable-height spring assembly drops into the standard rear spring perch on the trailing arm and locates on the stock upper seat. No welding, drilling or bracket fabrication is needed.

There are three honest caveats. First, JOM supplies the kit without top mounts, so you reuse yours or buy new ones — on a car this age, new mounts are strongly recommended. Second, the front struts require the stock cartridge to be removed and the knuckle's lower mount reused, which means compressing nothing but removing a few bolts; the job is mechanical, not creative. Third, "bolt-on" describes the fitment, not the outcome: ride quality depends on damping quality, spring rates and how low you set the car.

So if your question is whether the parts physically install with hand tools in a home garage, the answer is yes. If your question is whether the result will feel like a factory BMW, that depends on the variant you choose and the care you take with setup — both covered in detail below.

What 'bolt-On' Really Means for E34 Suspension

The E34's front suspension is a MacPherson strut design, which is why coilover conversion is so straightforward. The strut cartridge slides into the knuckle, the spring and damper assembly sits between the lower spring seat on the strut body and the upper mount bolted to the strut tower. A coilover simply replaces that entire assembly with a threaded-body damper and an adjustable lower collar.

The rear is different, and this is where people get confused. The E34 uses a multi-link rear axle with separate springs and dampers. A JOM rear coilover is not a true coilover at all — it is a shorter, stiffer spring paired with a height-adjustable perch that sits in the factory spring location, while the original damper position is retained by the supplied rear dampers. Functionally you still get ride-height adjustment, but the rear is a spring-and-perch system, not an integrated coilover unit.

Understanding this distinction saves you from unrealistic expectations. Rear height adjustment on the E34 changes the spring's effective position on the perch; extreme drops at the rear can reduce travel and cause the tyre to contact the inner arch on compression. Front drops are limited by the top mount stack and CV joint angles. Practical, safe lowering on an E34 with any threaded kit is roughly 30–60 mm front and rear; beyond that you trade drivability, tyre wear and driveshaft boot life for looks. (See Also: Are High Powered Bolt Action Rifles Legal)

How Jom E34 Coilovers Mount Front and Rear

Front installation follows the factory layout. The threaded strut body inserts into the knuckle and is clamped by the original pinch bolt or through-bolt depending on year. The supplied lower spring perch and lock ring thread onto the body, and the top of the strut passes through your existing top mount and bearing into the strut tower. JOM includes new nuts and washers where the originals are single-use, but the top mount itself is a reuse item unless you order one.

At the rear, the height-adjustable perch assembly sits on the trailing arm's lower spring seat, and the progressive or linear spring locates in the factory upper cup on the body. The supplied rear damper bolts into the original lower eye and upper stem mount. Check the upper rear damper stem nut and the lower bolt for corrosion before you start — these are the two fasteners most likely to fight you on a northern-climate car.

A few fitment details worth verifying before ordering: JOM's E34 kits are listed for saloon models; the Touring (estate) uses a different rear setup and needs the Touring-specific listing. Cars with self-levelling rear suspension (SLS) need that system deleted or bypassed, which is a modification beyond simple bolt-on. And E34 M5 models use different front struts, so confirm the kit listing covers your exact variant before buying.

Jom Coilover Options for the E34 Compared

JOM offers its E34 kits in several damping tiers, and choosing between them matters more than any other decision in the process. All share the same bolt-on fitment and height adjustment range; the differences are damper quality, spring rate, adjustability and warranty length.

For most E34 owners, the Euro Height Adjustable kit is the sensible pick. The Blueline suits cars driven daily over poor roads where the softest damping preserves what's left of the ride. The adjustable-damping option is worth the extra money only if you genuinely plan to use the adjuster — many owners set it once and never touch it again.

Note that JOM sits at the budget end of the coilover market. Compared with KW, Bilstein or BC Racing, the dampers are simpler and the valving less refined. For a weekend car or a modest drop, that trade-off is reasonable; for a high-mileage daily or a car you track, budget for a mid-tier brand instead.

How to Install Jom Coilovers on an E34: Step-by-Step

The job takes a competent home mechanic 4–6 hours with basic tools. Work one corner at a time so you always have a reference for orientation and hardware.

1. Prepare the car. Loosen wheel bolts while it's on the ground, then lift and support on stands at the jacking points. Remove the wheels.
2. Front struts: disconnect the anti-roll bar end link and brake hose bracket from the strut, then remove the three top mount nuts in the engine bay tower.
3. Unbolt the knuckle clamp and withdraw the complete strut assembly downward. A gentle tap with a rubber mallet usually frees a corroded knuckle clamp.
4. Remove the top mount, then transfer it (or fit a new mount) onto the JOM strut with the supplied nut. Set initial ride height roughly mid-thread before installation.
5. Refit in reverse order. Torque the top mount nuts, the knuckle clamp bolt and the wheel bolts to BMW's factory specifications — the knuckle clamp in particular must be fully torqued with the car's weight on the wheel to avoid preloading the bushing.
6. Rear: support the trailing arm with a jack, remove the lower damper bolt and the upper stem nut, then compress and remove the original spring. Fit the JOM perch assembly and spring, then the new damper.
7. Set all four corners to the same measured drop — measure from arch lip to wheel centre on each corner rather than eyeballing thread height.
8. Get a full four-wheel alignment immediately. The E34's camber and toe change noticeably with any drop.

Ride Height, Damping and Real-World Numbers

JOM's E34 kits are typically advertised with a lowering range of roughly 30–80 mm, but the usable window is narrower than the brochure suggests. Below about 60 mm of drop, the front top mount stack runs out of travel, the CV joints operate at sharp angles, and the front tyres begin scrubbing the inner arch on full lock and compression. (See Also: Are Head Studs Better Than Bolts)

The sweet spot for a street-driven E34 is 35–50 mm. At this height the car sits noticeably lower with a purposeful stance, the alignment can be brought back within reasonable camber tolerance, and the dampers still control the springs rather than being overwhelmed by them. JOM's spring rates on the E34 kits run firmer than stock — expect a noticeably harsher ride over sharp expansion joints, especially on the fixed-damping Blueline and Euro kits.

Height adjustment works via threaded collars: the front perch raises and lowers the spring seat on the strut body, and the rear perch does the same on the trailing arm. Adjust with the supplied C-spanner with the weight off that corner. Make changes in small, even steps across all four corners, then re-measure after driving 50–100 km, because new springs settle slightly. Keep at least a few turns of thread engaged on every collar and lock the rings against each other properly — a loose collar grinding against the threads is the most common self-inflicted failure on budget coilovers.

Common Mistakes When Fitting Coilovers to an E34

Most problems with this installation come from the chassis, not the kit. An E34 is old enough that the fasteners and mounts you're reusing have decades of corrosion behind them, and skipping preparation is what turns a bolt-on job into a struggle.

• Reusing tired top mounts. Worn front top mounts and bearings cause knocking and uneven height readings. Replace them while the struts are out — the parts are inexpensive relative to the labour of doing it twice.
• Skipping the alignment. Even a 30 mm drop pulls the front camber negative enough to chew the inner shoulder off a tyre within a few thousand miles. Book the alignment for the same week.
• Setting extreme rear height. Dropping the rear to the bottom of the perch range removes bump travel and can let the tyre contact the arch on loaded Touring-model boot or hard compression.
• Under-torquing the knuckle clamp. A loose front strut in the knuckle produces clunks and, in the worst case, allows the strut to slide under braking. Torque it properly with the car on its wheels.
• Ignoring seized adjuster collars. Clean the threads, apply anti-seize lightly, and cycle the collars before final assembly. A collar seized by road salt makes future height changes impossible without stripping the strut again.
• Forgetting brake hose and ABS line slack. Lowering the car reduces the distance between body and hub. Confirm the lines aren't stretched at full droop and full lock before driving.

Special Cases: Touring, M5 and Worn Chassis

Three E34 variants need extra attention before you order. The Touring uses a different rear axle arrangement with different spring seats and damper mounts, so the saloon kit will not fit — JOM lists a separate Touring application, and you must match it exactly. The M5 uses wider, differently mounted front struts and a firmer factory setup; only kits explicitly listed for the M5 are bolt-on, and the standard kit is not a drop-in on those cars.

Cars originally fitted with self-levelling rear suspension (Nivomat or SLS) present a genuine complication. The JOM kit replaces the self-levelling units with conventional springs and dampers, which means the hydraulic or pneumatic self-levelling hardware must be removed and, on some cars, the system's pump and lines dealt with. That's still achievable at home, but it's no longer purely a bolt-on afternoon.

Finally, assess the chassis itself. On a car with tired rear subframe bushings, worn thrust arm bushings or a corroded spring perch, new coilovers will simply expose those faults more loudly. Bumping stops that have collapsed, leaking original dampers and perished top mounts should all be addressed in the same visit. A 30-year-old suspension geometry will never feel sharp on 30-year-old bushings, no matter what you bolt to the knuckles.

Common Questions About Jom Coilovers on the E34

Do Jom Coilovers Fit the E34 Without Any Modifications?

Yes, on saloon models with conventional suspension the kits install into the factory mounting points with hand tools — no cutting or welding. You'll need to reuse or replace the top mounts, and Touring, M5 and self-levelling cars need their specific kit listings. Verify the exact chassis code and model on the listing before ordering.

How Low Can You Safely Go on an E34 with Jom Coilovers?

Practically, 35–50 mm is the safe street range. The kits adjust further, but beyond about 60 mm you risk tyre-to-arch contact, accelerated CV and top mount wear, and alignment angles that eat tyres. Extreme drops also leave the dampers under-travelled, so the ride becomes harsh without handling benefits. (See Also: Are Hardened Bolts Safe to Use on Tractors)

Are Jom Coilovers Good Quality for the Money?

They're a recognised budget option: genuine height adjustability and acceptable street damping at a fraction of premium-brand cost. The trade-offs are simpler damper valving, fixed rates on most versions, and shorter service life under hard use. For a modest drop on a street E34, most owners find the value acceptable.

Do I Need a Wheel Alignment After Installing Coilovers?

Absolutely. Any lowering shifts camber and toe. Skipping the alignment causes inner-shoulder tyre wear within a few thousand kilometres and vague or nervous steering. Book a four-wheel alignment immediately after installation and re-check after the springs settle over the first few hundred kilometres.

Will Jom Coilovers Fit E34 Models with Self-Levelling Suspension?

Not directly. Cars with self-levelling rear suspension need that system removed or bypassed before conventional springs and dampers can be fitted. The conversion is a known job but adds significant time and parts beyond a standard bolt-on installation, so factor it into your budget and plan.

What Tools Do I Need to Install Jom Coilovers on an E34?

Standard hand tools: jack and stands, a spring compressor for the rear springs, a C-spanner (supplied) for the collars, a torque wrench, plus penetrating oil and a breaker bar for corroded fasteners. Budget 4–6 hours. New top mounts, a four-wheel alignment and fresh torque checks complete the job properly.

Verdict

So, are JOM coilovers bolt on in an E34 BMW? Yes — on saloon models with conventional suspension, the kits install into the factory mounting points with hand tools, no fabrication required. Touring, M5 and self-levelling cars need their specific kit listings or extra conversion work.

"Bolt-on" describes the fitment, not the result. New top mounts, a correct torque sequence and an immediate four-wheel alignment determine whether the finished car drives well or simply sits low.

Set your height in the 35–50 mm window, replace worn bushings and mounts while you're in there, and a JOM kit is a reasonable budget route to a lower, better-looking E34. Confirm your exact model variant against the kit listing before ordering, since fitment details vary by year and body style.