B7xa Transmission

Honda has long built nearly all of its own automobiletransmissions, unlike many other automobile manufacturers which often source transmissions from external sources.^[1] The most notable exception was in 2014, when Honda decided to forgo an in-house designed transmission and chose the ZF 9HP transmission for their Acura TLX V6 model, later extending the offering of the ZF transmission to the Acura MDX, Odyssey, Pilot and Ridgeline.^[2] However, there have been reports of problems with ZF transmissions and Acura recalled its 2015 TLX models. ZF has attributed most of these problems to software issues.

B7xa Transmission
B7xa Transmission For Sale
Honda B7xa

Honda has long built nearly all of its own automobile transmissions, unlike many other automobile manufacturers which often source transmissions from external sources. The most notable exception was in 2014, when Honda decided to forgo an in-house designed transmission and chose the ZF 9HP transmission for their Acura TLX V6 model, later extending the offering of the ZF transmission. .The H5 transmission was redesigned with a stronger case and four shafts versus three in the earlier H5 transmissions. The four shaft H5 transmissions are much more robust and do not exhibit the same. New automatic transmission rebuild kit. Fits: Honda Accord V6. B7XA transmission code. 1998-2002 4 speed automatic. This transmission overhaul box kit comes with the following rebuild parts.

Automatic/Semi-automatic transmissions[edit]

Most of Honda's automatic transmissions are unusual in that they do not use planetary gears like nearly all other makers, however, Honda has recently introduced (2017) an all-new, in-house designed 10-speed automatic that uses planetary gears. Honda's older transmissions such as the Hondamatic semi-automatic transmission and its successors use traditional, individual gears on parallel axes like a manual transmission, with each gear ratio engaged by a separate hydraulic clutch pack.This design is also noteworthy because it preserves engine braking by eliminating a sprag between first and second gears. Instead of a sprag or roller clutch, Honda's older transmissions rely on pressure circuits to modulate line pressure to change gears.^[3]

Honda was forced to invent their new system due to the vast array of patents on automatic transmission technology held by BorgWarner and others.

Honda initially chose to integrate the transmission and engine block for its first application (in the N600) as in the Mini. The Hondamatic incorporated a lockup function, which Honda called a third ratio, and had manual gear selection. The company's early transmissions also used a patented torque converter which used stator force to reduce hydraulic losses by using a reaction arm to increase the hydraulic pressure when the stator was stalled. The reaction arm acted directly on the regulator valve this meant that increased pressure was available to the clutch plates when torque multiplication was greatest. The stator was equipped with a sprag clutch enabling it to freewheel when required. The N360/N600 controlled gear changes by balancing a throttle valve and a centrifugal valve. These 'opposing' pressures caused the gear changes through the free-floating gear change valves.

On October 18, 1967, the N360 AT model with the lock-up function was unveiled at the London Auto Show.(ref Honda Worldwide) It is not now clear if the lockup function made it into production; it was not fitted to the N600AT for Europe.

The typical torque converter of the time was about 11.5in. long and the torque multiplication ratio was about 1.5 to 1. The N360/N600 torque converter was about 5.5in. long and achieved a torque multiplication of over 2.2 to 1.

The first Civic was equipped with a manually changed hydraulically engaged two-speed transmission with a torque converter. This torque converter was nominally about 7in. and achieved a torque multiplication of c2.7 to 1. It also used the reaction arm on the stator as in the N360/N600 to increase hydraulic pressure. It was initially announced in Europe as an automatic as the staff at Honda in Europe assumed that it would like the N600 to be fully automatic. This was quickly changed to 'Hondamatic'. This gearbox was a separate unit and used ATF - Automatic Transmission Fluid.

The company's naming scheme is also confusing, as it is specific to a single model of the vehicle and some identifiers are reused.

1973–1979 H2 — 2-speed
- Honda Civic, Honda Accord, Honda Prelude
1979–1985 H3 — 3-speed
- Honda Civic, Honda Accord, Honda Prelude, Honda CRX, Triumph Acclaim
1983–1991 H4 — 4-speed (a.k.a. AS/AK/F4/CA/P1/K4/L4/PY8A/ML4A/MY8A)
- Honda Civic, Honda Accord, Honda Prelude, Honda CRX, Honda/Acura Integra
1986–1990 G4 — 4-speed (a.k.a. L5/PL5X)
1989–1991 Civic AWD — 4-speed (a.k.a. MPSA/S5)
- Honda Civic AWD
1990–1997 H4A — 4-speed (a.k.a. A6VA/AOYA/APX4/APXA/BOYA/MP1A/MP1B/MPJA/MPOA/MPWA/MPXA/PX4B)
- Honda Accord, Honda Prelude, Honda Odyssey/Isuzu Oasis, Acura CL
1990–2000 Integra — 4-speed (a.k.a. MP7A/MPRA/RO/S4XA/SKWA/SP7A)
1991–1998 Vigor — 4-speed (a.k.a. M1WA/MPWA)
- Acura Vigor, Acura TL
1991–2003 MPYA — 4-speed (a.k.a. MPYA/M5DA/M5HA/MPYA)
- Acura Legend, Acura TL, Acura RL
1992–2004 S24A — 4-speed (also A24A/A2YA/A4RA/B46A/B4RA/B7ZA/BDRA/BMXA/M24A/M4RA/M4TA/MCVA/MDLA/MDMA/MRVA/S4RA/SLXA)
- Civic, del Sol, CR-V(up until 2001)
1995–2002 B7XA — 4-speed (a.k.a. B7TA/B7VA/B7YA/M7ZA/MPZA)
- Honda Accord, Acura CL, Honda Odyssey/Isuzu Oasis, Acura TL
2003–2006(some 2007) MZKA — 4-speed, FWD & AWD (a.k.a. BZKA for FWD, MZKA for AWD)
2007–2011 MNZA — 5-speed, FWD & AWD (a.k.a. BZNA for FWD, MNZA for AWD)
1996–2003 Multimatic — CVT (also M4VA/MLYA/SLYA)
- Honda Civic HX CVT, Honda City
1997–2002 M6HA — 4-speed (also B6VA/BAXA/MAXA/MDWA/MGRA)
- Honda Prelude, Acura CL, Honda Accord, Honda Odyssey/Isuzu Oasis
2000–2013 H5 — 5-speed (also B7WA/BAYA/BCLA/BGFA/BGHA/BYBA/BWEA/M7WA/MAYA/MCLA/MDKA/MGFA/MGHA/MRMA)
- Acura TL, Acura CL, Acura MDX, Acura RSX, Acura RDX, Honda Odyssey, Honda Accord, Saturn Vue, Honda Ridgeline
2010– H6 — 6-speed （BYKA）
- Acura MDX, Acura ZDX, Acura RL, Acura TL, Acura RDX, Acura RLX (non-hybrid, 2014-2017), Honda Pilot, Honda Ridgeline
2014– ZF 9HP transmission — 9-speed
- Acura TLX (V6), Honda Pilot, Honda Odyssey, Acura MDX, Honda Passport, Honda Ridgeline (2020)
2017– Honda 10-speed automatic — 10-speed with Sequential SportShift Paddle Shifters
- Honda Odyssey, Honda Accord 2.0 turbo, Acura RDX, Acura TLX (2nd Gen), Acura RLX (non-hybrid, 2018-2020)

Continuous Variable Transmission[edit]

Dual-clutch transmission[edit]

2014– 8-speed dual clutch transmission with torque converter
- Acura TLX (I4), Acura ILX
2014– 7-speed dual clutch automatic transmission
- Acura RLX (Hybrid), Acura MDX (Hybrid)

Manual transmissions[edit]

1986-1987 A2K5/A2K6 — 5 Speed
- Honda Prelude 2.0 Si
1986 A1B2
- Honda Prelude Dx Carb
1986-1987 A2Q5 — 5 Speed
1986-1987 A2Q6 — 5 speed
1988 E2Q5 — 5 speed
1988 E2Q6 — 5 speed
1988-1989 D2J5 — 5 speed
- Honda Prelude Si
1989 E2R5 — 5 speed
1989 E2R6 — 5 speed
1990-1991 D2A4 — 5 speed
- Honda Prelude 2.0Si, Si, SR
1992-1995 S20 A000 — 5 speed
- Honda Civic CX, VX
  - 1—3.250
  - 2—1.761
  - 3—1.066
  - 4—0.852
  - 5—0.702
  - R—3.153
- Honda Civic DX,LX
  - 1—3.250
  - 2—1.761
  - 3—1.172
  - 4—0.909
  - 5—0.702
  - R—3.153
1992-1995 S20 B000 — 5 speed
- Honda Civic EX,Si
  - 1—3.250
  - 2—1.900
  - 3—1.250
  - 4—0.909
  - 5—0.702
  - R—3.153
1996-2006 SEV — 5 speed?
- Honda HR-V
1997 S8G — 5 speed
- Honda Integra (Japanese Domestic Market, ZC)
- Honda CRX del sol Si & ESi (late model with D16Y8 engine)
1997-1999 S20 B000 — 5 speed
- Honda Civic Coupe EX
1998 E5F P4A — 5 speed
- Honda Civic LX

2004-2007 ATC6 — 6-speed
- Honda Accord 3.0L
2007-2008 SMJM — 5 speed
- Honda Fit
2009-2014 SP4M — 5 speed
- Honda Fit
2015-2017 S7A7 — 6 speed
- Honda Fit

References[edit]

^Henry, Ian. 'Shifting priorities'. Automotive Manufacturing Solutions. Retrieved 18 December 2017.
^Duffer, Robert. 'Honda lurches ahead with pesky 9-speed transmission'. Chicago Tribune. Retrieved 18 December 2017.
^[1]

B7xa Transmission

External links[edit]

B7xa Transmission For Sale

'The Hondamatic Transmission'. Honda.Com. Retrieved February 25, 2006.

Honda B7xa

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