Quelle boîte ZF 8HP choisir ? Le guide de sélection complet
8hp selection · 8hp variants · 8hp45 · 8hp70 · 8hp90 · swap guide · zf 8hp
Picking the wrong 8HP costs you twice: once when you buy it, and again when you discover it will not bolt to your adapter, will not talk to your controller, or will not clear your transmission tunnel.
This guide walks the exact order of decisions that experienced swappers use. It is built around the question that actually matters: which 8HP fits the build you are doing, not which one is "best" in isolation. There is no best 8HP. There is only the 8HP that matches your controller, your bellhousing, and your chassis.
The short answer: choose your controller first, then the 8HP variant it supports, then a donor transmission with the bellhousing pattern your adapter was designed for, then confirm physical fitment. Do it in that order and you avoid nearly every expensive mistake.
Step 1: Choose your controller before you choose a transmission
This is the step almost everyone gets backwards. The transmission is the easy part. The electronics decide which transmissions are even options for you.
Each standalone controller supports a specific list of 8HP variants. If you buy a transmission first, you can end up with a gearbox no controller will run.
Controller to transmission compatibility
| Controller | 8HP variants supported | Notes |
|---|---|---|
| TurboLamik | 8HP45, 8HP50, 8HP70 (electronic shifter), 8HP75, 8HP90 | Beta: 8HP51 (with 8HP50 valve body), 8HP55, 8HP95 |
| CanTCU | BMW F-Series Gen 1 (8HP45/70/90), F-Series Gen 2 (8HP50/75/95), G-Series Gen 2 (8HP50/75), G-Series Gen 3 (8HP51/76) | G-Series Gen 3 needs a third-party immobiliser bypass. VAG 8HP55 requires a bench flash |
| MaxxECU | 8HP45, 8HP70, 8HP90 (Gen 1 only, requires TCU reflash) | Beta: 8HP55 AWD. Not supported: 8HP50 / 8HP75 |
That last line is the one that catches people. If you plan to run a MaxxECU and you have already bought an 8HP50 or 8HP75, you have a problem.
Practical rule: decide your controller, write down its supported variant list, and only then start shopping for a gearbox. Everything downstream depends on this.
Step 2: Understand the variant families and their ratings
Every 8HP number tells you its torque class, and the numbering is genuinely systematic. The figure after "8HP" is broadly the nominal torque capacity in newton metres.
Civilian variants cluster into three families:
| Family | Variants | Nominal torque |
|---|---|---|
| Light to medium duty | 8HP30, 8HP45, 8HP50, 8HP51, 8HP55 | ~300 to 550 Nm |
| Heavy duty | 8HP65, 8HP70, 8HP75, 8HP76 | ~650 to 760 Nm |
| Ultra heavy duty | 8HP80, 8HP90, 8HP95, 8HP100 | ~800 to 1000+ Nm |
Those ratings reflect what ZF signed off for factory warranty in a production car. They are not a hard ceiling on what the hardware survives in a modified application, and plenty of builds run meaningful torque above the number on the case. Treat the rating as the manufacturer's duty cycle, not as the point where the gearbox breaks.
For a modified build, the honest way to choose is to work out what you are actually going to put through it and give yourself margin, then let the controller support list and bellhousing availability constrain the choice from there.
Step 3: The complete variant reference table
This is the table worth bookmarking. Torque figures are ZF's published maximum input torque for factory applications, petrol and diesel where both are listed.
| Variant | Max torque | Generations sold | Notable factory applications |
|---|---|---|---|
| 8HP30 | 300 Nm | 1st gen | BMW 1 Series (F20), BMW X1 (E84) |
| 8HP45 | 450 / 500 Nm | 1st gen | BMW 1,2,3,4,5,6,7 Series; X1, X3, X4, X5, X6; Z4; Jaguar XE, XF, XJ; Range Rover L322 and L405; Range Rover Velar; Lancia Thema V6 |
| Torqueflite 845RE | 450 / 500 Nm | 1st gen | Chrysler 300; Dodge Challenger, Charger, Durango; Jeep Grand Cherokee (WK2); Ram 1500 |
| 8HP50 | 500 Nm | 2nd gen | Alfa Romeo Giulia, Stelvio; BMW 1,2,3,4,5 Series (F-series) |
| Torqueflite 850RE | 500 Nm | 2nd gen | Dodge Durango; Jeep Gladiator (JT), Grand Cherokee (WK2), Wrangler (JL); Ram 1500 (DT) |
| 8HP51 | 500 Nm | 3rd gen | BMW 2 Series (G42), 3 Series (G20), 4 Series (G22), Z4 (G29), X3, X4; Jaguar XE; Morgan Plus Four |
| 8HP55 | 650 Nm | 1st gen | Audi A4, A5, A6, A7, S4, S5 |
| 8HP65 | 650 Nm | 2nd gen | Audi A4, A6, A7, Q7, Q8, A8 |
| 8HP70 | 700 Nm | Pilot, 1st gen | Alpina B3, B4, D3, D4; Aston Martin Rapide; wide BMW, Jaguar, Dodge and Ram fitment |
| 8HP75 | 700 / 740 Nm | 2nd gen | Alfa Romeo Giulia, Stelvio; Alpina B5, D5, B6; Aston Martin DB11; Ram |
| 8HP76 | 760 Nm | 3rd gen | Alpina; BMW 3 Series (G20/G21), 4 Series (G22/G23), M3, M5, M8, 730d, 8 Series |
| Torqueflite 880RE | 800 Nm | 3rd gen | Dodge Charger (2024) |
| 8HP80 | 800 Nm | 3rd gen | BMW 7 Series, X5, X6, X7; Alpina; Hongqi Guoya |
| 8HP90 | 900 / 1000 Nm | 1st gen | Audi A8, RS6; Bentley Mulsanne, Continental GT; BMW 760i/Li (F01/F02); Dodge Challenger, Charger; Porsche Cayenne |
| 8HP95 | 900 / 1000 Nm | 2nd gen | Aston Martin DBS Superleggera; Audi S8, RS6, RS7, SQ7, Q8, RS Q8; Bentley Bentayga |
| 8HP100 | 1000 Nm | 4th gen | BMW XM, BMW M5 |
A note on the Torqueflite badge. Chrysler's 845RE, 850RE and 880RE are ZF 8HP units built under licence and badged as Torqueflite. Mechanically they are 8HP-family gearboxes, so 8HP parts knowledge largely carries across, but the case, valve body and electronics are not interchangeable with the equivalent BMW variant.
Step 4: The head-to-head comparisons that actually get asked
8HP45 vs 8HP70
The 8HP45 is the light-duty workhorse: 450 Nm petrol, 500 Nm diesel, and it sits behind naturally aspirated and small-displacement forced induction engines across BMW, Jaguar and Range Rover. The 8HP70 is the heavy-duty step up at 700 Nm, and it is the gearbox behind the torquier sixes and V8s.
Choose the 8HP45 when you have a moderate-torque engine and you want the lightest, most compact option with the widest and cheapest donor supply. Choose the 8HP70 when your torque figure is well north of 500 Nm, when you want the extra internal margin, or when your adapter kit and bellhousing plan are already built around the 70.
The practical trap is bellhousing. An 8HP70 from behind a BMW N57 and an 8HP70 from behind an N63 are not interchangeable for swap purposes even though they share a variant number.
8HP70 vs 8HP75
Same family, close ratings. The 8HP70 is rated 700 Nm, the 8HP75 is rated 700 Nm petrol and 740 Nm diesel. Both are heavy duty and both are well supported.
The difference that matters for a swap is usually generation and electronics, not strength. The 8HP75 is a second-generation unit, so it appears in later vehicles and brings a different TCU generation with it. Check your controller's list. TurboLamik covers both; MaxxECU's support is limited to first-generation hardware, which shuts the 8HP75 out.
8HP50 vs 8HP70
The 8HP50 is a 500 Nm second-generation light-duty unit, common behind BMW's F-series four and six cylinder engines and in the Alfa Giulia and Stelvio. The 8HP70 is the 700 Nm heavy-duty unit.
This is the cleanest "do I need to step up" comparison in the range. If your engine is comfortably under the 500 Nm figure and you want the widest controller support, the 8HP50 is a strong, cheap, plentiful choice. If you are anywhere near 500 Nm, or you intend to add torque later, go straight to the 8HP70 and skip the regret.
Note also that the 8HP50 appears in both BMW F-series fitment and Alfa Romeo fitment. Those are different bellhousings.
8HP90 vs 8HP70
The 8HP90 is the ultra heavy-duty unit at 900 to 1000 Nm, fitted to everything from the Audi RS6 and Bentley Continental GT to the Dodge Hellcat cars and the BMW 760i. The 8HP70 is the 700 Nm heavy-duty unit.
Choose the 8HP90 when you are genuinely building big power, when you want maximum internal margin, or when the 8HP90 is simply what came with your engine package. Choose the 8HP70 when you want a lighter, smaller, cheaper and far more plentiful gearbox that is still rated for a serious amount of torque.
The honest trade is packaging. The 8HP90 and 8HP95 are physically larger and heavier. If your tunnel, crossmember or floor is tight, the 8HP90 can turn a straightforward install into fabrication work.
8HP90 vs 8HP95
Very closely related ultra heavy-duty units with the same published 900 / 1000 Nm band. The 8HP95 is the later second-generation evolution and turns up in the fastest Audi and Bentley product. For swap purposes this is usually a generation and electronics question rather than a strength question, and TurboLamik lists 8HP95 as beta, so confirm support before committing.
850RE vs 8HP50, and 845RE vs 8HP70
These comparisons come up because the numbers do not line up neatly. The Torqueflite 850RE is a 500 Nm unit, which puts it against the 8HP50. The Torqueflite 845RE is a 450 / 500 Nm unit, so it sits closer to the 8HP45 than the 8HP70.
If you are shopping a Chrysler, Jeep or Ram donor, you are buying a licence-built 8HP with a Torqueflite badge. Buy it as what it is, check which controller supports that specific TCU, and do not assume it will swap with a BMW variant of a similar number.
Step 5: Bellhousing and adapter compatibility
Once electronics and variant class are decided, the adapter decides the rest.
Bellhousing patterns are OEM-specific, and differences exist within a single variant number. Even two 8HP70s can differ in bolt pattern, starter location and torque converter pilot depth depending on which engine they originally sat behind.
Common OEM bellhousing families:
- BMW: N, S and B series engines, each with their own fitment
- Dodge / Jeep: Gen 3 HEMI and Pentastar families
- VAG / Audi: longitudinal turbo fours and V6/V8 units
- Jaguar / Land Rover: AJ-V8 and diesel V6 units
If you are not using a native fit, your solution usually needs all of:
- Adapter plate between engine block and bellhousing
- Crank spacer or custom flexplate to reach the converter
- Pilot bushing or custom converter hub to centre the converter
The single most expensive mistake in this whole process is buying an adapter kit for one bellhousing pattern and a donor transmission from a different one. A BMW N57 8HP70 adapter will not bolt to a BMW N63 8HP70. Always confirm the adapter was designed for your exact engine-and-8HP combination, not just "an 8HP70".
Step 6: Confirm physical fitment before you commit
Even with electronics and bellhousing sorted, the gearbox has to physically live in the car.
| Check | Why it bites |
|---|---|
| Tunnel clearance | 8HP90 and 8HP95 are larger and frequently need clearance work |
| Mounting bosses | Rear mount patterns vary between variants and donors |
| Shifter location | May need a bracket or loom relocation |
| Output flange | BMW uses a 3-bolt flange with different PCDs; Dodge uses a slip yoke or large flange; Audi and Jaguar use a large offset flange |
| Overall length and tailshaft | Affects driveshaft length and angle |
Output flange adapters are available to convert to standard universal joints or slip-yoke driveshafts, so this is a solvable problem, but it is a problem you want to know about before the gearbox is on the bench.
Step 7: The selection sequence, in order
- Choose the controller (TurboLamik, CanTCU, MaxxECU). This defines your supported 8HP list.
- Pick the variant from that list using the torque family you actually need.
- Match the adapter to the specific bellhousing pattern of your chosen donor.
- Verify physical fitment in your chassis: tunnel, mounts, shifter, output flange.
- Order the supporting parts as one plan: controller, adapter, converter solution, shifter, cooling, driveshaft.
Work in that sequence and every decision is constrained by the one before it. Work in any other sequence and you will buy something twice.
Frequently asked questions
What is the strongest ZF 8HP transmission? The 8HP100 is the highest-rated civilian variant at 1000 Nm, fitted to the BMW XM and M5.
What cars have the 8HP70 transmission? The 8HP70 appears across BMW, Jaguar, Dodge and Ram applications, along with Alpina models and the Aston Martin Rapide.
What is the maximum torque an 8HP70 can take? ZF rates the 8HP70 at 700 Nm for factory applications. Modified builds commonly run above that figure, but the rating is the manufacturer's duty cycle rather than a break point.
Which 8HP transmissions does TurboLamik support? 8HP45, 8HP50, 8HP70 (electronic shifter only), 8HP75 and 8HP90, with 8HP51, 8HP55 and 8HP95 listed as beta.
Which 8HP transmissions does MaxxECU not support? The 8HP50 and 8HP75. MaxxECU's 8HP support is limited to first-generation hardware, and specific TCU hardware numbers are required.
Can I use an N63 8HP70 with an N57 adapter kit? No. They are both 8HP70s but the bellhousing pattern, starter location and converter pilot depth differ. The adapter must match the specific engine and transmission combination.
Is an 850RE the same as an 8HP50? It is from the same family and carries a similar 500 Nm rating, but it is a Chrysler licence-built unit with its own case, valve body and electronics. Do not assume interchangeability.
Next step
If you are working out which gearbox, controller, adapter and shifter combination actually fits your build, talk to us before you buy. We stock 8HP conversion parts built around real swap combinations, and we would rather spec it correctly once than sell you a part twice.
Specifications in this guide are drawn from ZF's published maximum input torque ratings for factory applications and manufacturer application lists. Torque figures describe factory warranty duty cycles, not the point of mechanical failure.
Related guides
- 8HP51 vs 8HP70 vs 8HP76: Which ZF 8HP Should You Buy?
- 8HP Swap Buyer's Checklist: Gearbox, Adapter, TCU and Wiring
Ready to compare donors? The ZF 8HP gearboxes for sale in Australia lists the current 8HP45 and 8HP76 units with mileage and prices.