When a truck gearbox fails, fleets usually weigh three paths: buy new, buy a specialist reconditioned unit (often on exchange), or try a DIY parts-only rebuild in their own bay. The cheapest invoice line is not always the cheapest downtime. This guide compares those three options the way fleet managers actually decide — cost band, time off the road, warranty, and fitment risk.
A brand-new OEM gearbox is the cleanest technical choice when budget and lead time allow. You pay the top rate and you wait for the correct unit. For many South African operators that wait is measured in weeks, not hours, especially on less common ratios. New is right when the casing is scrap, the duty cycle is extreme, or policy demands an OEM-new replacement — not when a sound housing can be rebuilt to OEM tolerances at a fraction of the price.
| New | Reconditioned | DIY parts | |
|---|---|---|---|
| Cost band | Highest — OEM unit price plus common weeks-to-months lead time. | Typically 40–70% less than new for a fully rebuilt unit (model-dependent). | Parts look cheap upfront; labour, mistakes, and second stripouts often erase the saving. |
| Downtime | Long lead times are common when the correct OEM unit is not on a local shelf. | Typically 24–48 hours for a standard rebuild; faster when exchange stock is available. | Your bay owns the clock — often longer once wear items and fitment issues appear mid-job. |
| Warranty | OEM warranty on a genuine new unit. | 12-month warranty on reconditioned units from Gearbox Centre (terms apply — see warranty.pdf). | Usually none on a DIY assembly — failures sit with the workshop that built it. |
| Fitment risk | Lowest when the exact OEM family and ratio are confirmed. | Low — full strip, inspect, and rebuild to OEM tolerances at our RMI Approved Centurion workshop. | Highest — wrong parts, missed casing damage, and no independent dyno/release gate. |
A reconditioned gearbox from Gearbox Centre is stripped, inspected, and rebuilt at our RMI Approved workshop in Centurion. Worn bearings, seals, synchros, and damaged hard parts are replaced; the unit is released as a complete assembly. Published customer promise: typically 40–70% less than new, typically 24–48 hour turnaround on standard rebuilds, 12-month warranty (terms apply), and nationwide delivery. Where exchange stock allows, we can send a ready recon unit while you return the old core — often the fastest way to get a linehaul or tipper moving again.
DIY parts-only is the path many workshops try first: order a kit, strip in-house, and hope the housing and shafts are healthy. It can work for a simple bearing job with an experienced bench. It fails fleets when the failure mode was misdiagnosed, when gears or casings were already beyond economic repair, or when there is no structured inspection checklist. You own the labour, the second failure, and usually no meaningful warranty. That is why we frame “parts” here as a DIY rebuild — not as a complete exchange unit from a specialist.
How to choose: pick new when lead time and budget allow and policy requires it. Pick recon when you need OEM-tolerant quality, documented rebuild practice, and a warranty path without OEM list price. Pick DIY parts only when your workshop has the tooling, the diagnosis is proven shallow, and downtime risk is acceptable. Unsure? Send the type plate via WhatsApp +27 68 521 4096 or use the quote form below — we will confirm family, stock, and whether exchange or strip-and-quote is the honest next step.
Strip-and-quote applies when damage is unknown before disassembly: we strip, identify failed parts, and quote before rebuild. Exchange applies when a matching recon unit is on the shelf. Neither path invents a fake local branch — one Centurion workshop, clear communication, and a unit you can put back to work.