Toyota R154
Specifications and Details
The R154 is
made by Toyota, Japan. It's a 5 speed gearbox (5 forward gears + reverse).
As with most Toyota driveline components, the R154 is of quality design
and construction. Unfortunately as always seems to be the case with modern
technology, there is always an Achilles heal.
The R154 is a conventional 5-speed gearbox, with 5 forward gears and a
straight-cut reverse gear. The reason for the strength of the gearbox is
plain to see even by the naked eye. The external casing and the gears
themselves are credibly sized for a performance-oriented gearbox.
The weak point, however, is the first gear thrust washer. Being of a cast
construction, this part is prone to failure if the box is maltreated. In
most known cases this is a result of one (or a combination of!) three
things:
* abuse or misuse of the gearbox
* when the gearbox is used with a high-clamp and/or button clutch
* big-horsepower applications
The easiest fix for this weakness is to lighten up on the gearbox and
treat it with respect. For gearbox owners with less self-control, the best
option is to have the gearbox broken down and reassembled with a new
thrust washer made of chromoly for added strength.
The part itself is quite inexpensive (around AUD$26.50), however the damage
it can cause in the event of failure is quite humbling. The first gear
bearing takes the brunt of this failure due to being located in front of
the thrust washer. |
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In more severe failures, or if the car continues to be driven after a
failure, one or more of the gears will need to be replaced. First gear
alone has been priced at AUD$550. Certainly not a cheap
exercise, and one better avoided.
In a perfect world the ideal solution is to replace the R154 with a V16x
gearbox from a Mk4 Supra. These are much stronger and more widely proven
behind big-horsepower 2JZ engine combinations. |
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Manual Transmission
Specifications |
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Gear |
Ratio |
Km Per 1000rpm |
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First |
3.251 |
9.6 |
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Second |
1.955 |
16.0 |
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Third |
1.310 |
24.0 |
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Fourth |
1.000 |
31.4 |
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Fifth |
0.753 |
41.7 |
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Reverse |
3.18 |
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Final Drive |
3.727 (Mechanical LSD) |
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Lubricant Capacity |
3 Litres |
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Oil Specifications |
80W-90 GL4 or 5 Gear Oil |
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Dry Weight |
46kg |
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Length -
Bell housing to Out put shaft |
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Length -
Bell housing to End case |
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Length -
Bell housing to Centre of Shifter |
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Width -
Bell housing |
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Width -
Gear Case (maximum) |
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Height -
Bell housing |
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Height -
Gear Case (maximum) |
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Input Shaft
OD |
30mm |
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Drive Plate
Diameter |
245mm |
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Drive plate
surface area |
40mm |
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