# Monroe 58643 Sensa-Trac Rear Load-Adjusting Shock Absorber

The Monroe 58643 Sensa-Trac is a rear load-adjusting shock absorber listed for trucks. Its gas charge and application-tuned valving are intended to support ride control across changing road and load conditions, so confirm exact vehicle fitment before ordering.

- [Original product page](https://loonieperks.com/product/monroe-58643-sensa-trac-rear-load-adjusting-shock-absorber)
- [View offer](https://loonieperks.com/visit/monroe-58643-sensa-trac-rear-load-adjusting-shock-absorber)
- Market: CA
- Language: en-CA
- Currency: CAD
- Brand: Monroe
- Model: 58643
- Category: Cars & Motorcycles > Auto Parts & Maintenance > Mechanical Parts
- Price: 202.90 CAD
- Previous price: 267.45 CAD
- Discount: 24%
- Price checked: 2026-11-13T12:13:09.189Z
- Rating: 4.6 / 5
- Reviews: 718

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## At a glance

- Load-adjusting design is positioned for light trucks carrying varying loads or towing.
- The listing describes application-tuned valving and precision-tapered grooves for adapting damping response to road conditions.
- Nitrogen gas charge is claimed to reduce aeration and help maintain tire-to-road contact.

## Pros

- Load-adjusting design is aimed at truck use with varying loads or towing.
- The listed valving and groove-tube features provide a specific ride-control rationale rather than a basic shock-only description.
- Customer feedback reports positive fit and straightforward installation, though vehicle compatibility still needs confirmation.

## Specifications

### Identity
- Brand: Monroe
- Model: 58643
- Position: Rear
- Vehicle type: Truck
- Number of items: 1
### Dimensions and installation
- Dimensions listed: 64.77 x 18.29 x 9.4 cm; 5 kg
- Weight listed: 5000 g
### Materials and protection
- Material listed: Polytetrafluoroethylene
### Listed design features
- Fluid: All Weather Fluid: Contains special modifiers to reduce friction and ensure smooth rod reaction
- Valving: Full Displaced Valving: Tuned specifically for each application, this valving automatically adjusts to road extremes to provide consistency and ride comfort
- Piston: Fluon Banded Piston: Works with the existing groove tube technology to provide responsiveness to changing road conditions
- Tube design: Unique Groove Tube - PSD: Precision tapered grooves help provide added control without sacrificing comfort
- Gas charge: Nitrogen Gas Charged: For improved ride and handling, helps maintain tire to road contact by reducing aeration

## Before you buy

- Confirm that model 58643 matches the vehicle, axle position and suspension configuration. The listing gives only a general truck type and rear position, not a complete vehicle fitment list. Monroe also advises inspecting worn coil or air springs and checking alignment when replacing ride-control parts.

## A good fit for

- Truck owners seeking a rear load-adjusting shock for varying loads or towing, after confirming exact fitment.
- Buyers who want a shock with listed gas charging and application-tuned valving.

## Less suited to

- Buyers who need a confirmed fitment for a particular vehicle without checking application details.
- Buyers who need a multi-shock set, since the listing specifies one item.

## Customer feedback

Customer feedback highlights perceived quality, fit and relatively straightforward installation, with some customers saying performance exceeded their OEM parts. These reports may matter to buyers replacing a rear truck shock, but they do not confirm fit for a specific vehicle. Stability and durability experiences are mixed, so customer praise should not be read as assurance of long-term results.
- Positive themes: Customers describe the shock as good quality and report easy installation or replacement.
- Positive themes: Feedback reports good fit on some trucks and positive impressions of ride or shock performance.
- Positive themes: Some customers consider it worthwhile for the price.
- Mixed feedback: Customer opinions on stability and durability are mixed.

## Frequently asked questions

### Does this shock fit my truck?
The listing identifies it as a rear shock for trucks but does not provide a complete vehicle fitment list. Match model 58643 to your exact vehicle and suspension before purchase.
### Is this sold as a pair?
The listing states one item. It does not indicate a pair.
### What features are described?
The listing specifies nitrogen gas charging, application-tuned valving, a Fluon banded piston and a groove-tube design. These are manufacturer claims, not independently verified performance results.
### What do customers report?
Feedback describes quality, fit and installation positively, while stability and durability opinions are mixed. These reports do not establish fitment for a particular vehicle.

## Alternative options

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## Add-ons

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## Images

![Monroe 58643 Sensa-Trac Rear Load-Adjusting Shock Absorber — 1](https://loonieperks.com/i/0dWpfyk3uuivrgrGmntKVh0V-dESUJ3gWJ8nBmaW2Kr2Z2_EVlapCKS0J2c8hMhzYNMCM95qPBjM0j3C2u70O7PHJBm6MLd3unqwTYrxWrolRWD-Pxn85Rhq.jpg)

![Monroe 58643 Sensa-Trac Rear Load-Adjusting Shock Absorber — 2](https://loonieperks.com/i/WK-OpSRztPuHkx2Ela1-ohetnMyo27ORITslG_NucHzSdc5N0yBNdAi0svk2L-yts2a-wwZhZue7qUfvjCpOTi8xScki8mFQZlmKhNGKpa-BIBRZ7qXCZWa4.jpg)

![Monroe 58643 Sensa-Trac Rear Load-Adjusting Shock Absorber — 3](https://loonieperks.com/i/zBGPrDaRUgxMA1BxCdnxkmDq5tIZ7l-Ta12f06RfARbayY3uQmOOKbsP3WQqsNAlI66xcca-zQbYofd10892Aw4dBi3mLwGzew6ICX34BObz_EmrJVbqBG3D.jpg)

![Monroe 58643 Sensa-Trac Rear Load-Adjusting Shock Absorber — 4](https://loonieperks.com/i/e-UNnWWrc8NYaUa7gUQt0G77Hfn-Vn90nduO6WX6K4vPPr1xtE1tWrwWZQEJY4mjvHC89-lI7oqsyKxxeXSUWKLGxxeybT35v9rLwBX6GCxMYoHpfZ20ufBK.jpg)

![Monroe 58643 Sensa-Trac Rear Load-Adjusting Shock Absorber — 5](https://loonieperks.com/i/ehYlAvxe4ZlXr12AVVmBpzXka3wJK7tX9BYjFuIdvpVW6N2U8TtozuYGaTbHHkToPXcIF8ZwgmvVBLMj5-vFovM_kmyjsYB6muCiippICvEsCK6hAhVgRJ4n.jpg)