S400 Replacement Turbo Cross-Reference: S467 to S488
If you are replacing an S400-frame turbocharger, this page tells you which True North Turbos unit drops into its place. Every TNT4R turbo is built on the 400 frame, which means the mounting hardware you already have — manifold, downpipe flange, clamp, compressor discharge, and oil drain — carries straight over.
True North Turbos are designed, machined, assembled, and balanced in Canada by Black Sheep Industries. They are not rebadged imports, and they are not BorgWarner products. They are purpose-built replacements engineered to the same frame standard.
Cross-Reference Table
Match your existing turbo on the left, find the TNT equivalent on the right.
| Replacing | Compressor | TNT Equivalent | Flange | Approx. Power |
|---|---|---|---|---|
| S467 | 67mm (2.64") | TNT467 67mm T4 | T4 | 750–850 WHP |
| S472 | 72mm (2.83") | TNT472 72mm T4 | T4 | 850–950 WHP |
| S475 / S476 | 76mm (2.99") | TNT476 76mm T4 · TNT476 76mm T6 | T4 or T6 | 950–1,050 WHP |
| S480 | 80mm (3.15") | TNT480 80mm T4 · TNT480 80mm T6 | T4 or T6 | 1,050–1,200 WHP |
| S483 / S485 | 85mm (3.35") | TNT485 85mm T4 · TNT485 85mm T6 | T4 or T6 | 1,200–1,300 WHP |
| S488 | 88mm (3.46") | TNT488 88mm T4 · TNT488 88mm T6 | T4 or T6 | 1,200–1,300 WHP |
| S492 | 92mm (3.62") | TNT492 92mm T6 | T6 | 1,500+ WHP |
Browse the full range: TNT4R T4 · TNT4R T6
What "Direct Replacement" Actually Means
Because a TNT4R is built on the same 400 frame, the interfaces around it are unchanged. In practice:
- Turbine inlet. T4 or T6, matching your existing manifold. No manifold change if you stay on the same flange.
- Turbine discharge. 5.75" (146mm) marmon on T6, 4.62" (117mm) half marmon on T4 — the same flanges and clamps you are already running.
- Compressor discharge. V-band sized to your charge pipe, unchanged.
- Oil drain. Large-frame 50.8mm (2.00") bolt centre with a 12AN port, unchanged.
- Oil feed. Same feed arrangement; confirm your restrictor matches the bearing type you are moving to.
Detail on each interface: S400 Flange Guide and S400 Oil Drain Guide.
What Is Not Identical
Being honest about this matters more than a marketing claim would.
- Wheel design differs. TNT compressor and turbine wheels are our own designs, not copies. The 12-blade billet compressor on the TNT485 and TNT492 and the 96x88 and 103x92 turbine options were developed specifically to reduce restrictions we found in standard offerings. Expect the airflow character to differ somewhat from the unit you are replacing, generally in your favour.
- A/R options may differ. Check the housing options against what you are running — see the A/R guide.
- Built to order. Most TNT4R turbos are assembled to your spec rather than pulled from a shelf, so lead time applies.
- Tuning. Any turbo change on a tuned truck warrants a look at boost control and fuelling.
Choosing If You Are Not Replacing Like for Like
If you are stepping up rather than swapping the same size, the sizing guide walks through the trade between airflow and spool:
Not sure which unit replaces yours? Send your current turbo details and build goals through the Turbo Spec Form and we will confirm the match before you order.
Frequently Asked Questions
Is a True North turbo a direct replacement for an S400?
Yes. TNT4R turbochargers are built on the 400 frame, so the manifold, downpipe flange, clamp, compressor discharge, and oil drain from an existing S400-frame installation all carry over. Match the compressor size and turbine flange and it bolts into the same place.
Which True North turbo replaces an S476?
The TNT476, available in both T4 and T6 flange configurations with a 76mm compressor. It covers S475 and S476 applications and supports roughly 950 to 1,050 wheel horsepower.
Which True North turbo replaces an S488?
The TNT488, in T4 or T6, with an 88mm compressor and a choice of 96x88 or 103x92 turbine wheels. It supports roughly 1,200 to 1,300 wheel horsepower.
Do I need new flanges or a new drain to switch?
No, provided you stay on the same turbine flange. The 400 frame uses the same 5.75" marmon discharge on T6, 4.62" half marmon on T4, and a 50.8mm bolt centre 12AN oil drain. If you are moving between T4 and T6 you will need the matching downpipe flange and clamp.
Are True North turbos made by BorgWarner?
No. True North Turbos are designed, machined, assembled, and balanced in Canada by Black Sheep Industries. They are independent products built to the same frame standard, not rebadged or licensed units.
Will a TNT turbo perform the same as the unit it replaces?
Not identically. Compressor and turbine wheels are our own designs, developed to reduce restrictions found in standard offerings. Fitment is equivalent; airflow character will differ, generally with more capability at the same frame size.
Trademark Notice
BorgWarner, S400, S400SX, and S400SX-E are trademarks of BorgWarner Inc. Black Sheep Industries Inc. and True North Turbos are not affiliated with, endorsed by, sponsored by, or otherwise connected to BorgWarner Inc. All product names, model designations, and part numbers referenced on this page are used solely for identification and fitment reference, to describe the applications our products are designed to replace. True North Turbos products are independently designed and manufactured by Black Sheep Industries Inc. in Canada.