J160 Gearbox

TRD gearsets were available for K50 gearboxes. T40/T50 (Toyota Factory 4/5 Speed Manual) The T50 gearbox is a lot stronger than the K50 gearbox and is a split casing design. You can still purchase close ratio gearsets for the T50 gearboxes through TRD and also Quaife. The T40 or T50 gearbox can be adapted to a K series motor with a K-T Bellhousing.

1. Toyota J160 A limited run was produced of custom front cases for Toyota T-50 bellhousing, so with this gearbox a Dellow kit might work to mate it to the A-series engine. Aisin AZ6 with custom front case for T-50 removable bell housing. A custom input shaft is used.
2. See Toyota A transmission for a complete list of Toyota/Aisin models. Aisin AW supplies automatic transmissions to 55 automotive manufacturers around the world, 1 virtually every major OEM. These include General Motors, Ford, Jeep, Mitsubishi, Nissan, Saab, VW, Volvo, Hyundai, MINI among others.
3. The shifter assembly is designed to fit directly onto the J160 without any cutting, grinding or modifications. Just remove the stock hardware and bolt ours on. The shifter bridge will fit both the stock shifter assembly and short throw shifters, (some fitment may be required for short shifter asemblies).

J160 Gearbox

6-speed transmission gives you two (count 'em 2) overdrive gears. Or some have a close ratio direct-5th with overdrive, which is better for performance. 6-speeds can be modified to fit Datsun 1200. Just cut the bellhousing and weld on a fragment of A-series bell housing, then machine the input shaft smaller.

6-speed with A-series bell grafted on
Album click to view

The basic Aisin AZ6 gearbox was made in several versions, with front cases for these engines:

• Nissan FS6R30A (source: Nissan pickup 2004-)
• Nissan FS6R31A for SR20DET (source: S15)
• Nissan FS6R31A for VQ35 (source: Z33)
• Nissan FS6R92A for VQ35 (source: G35) 130 lbs weight
• Nissan FS6R92A for SR20 (source: S15)
• Mazda Renesys (RX8 rotary)
• Mazda Y16M-D F & B (1999-2005 MX-5)
• Toyota J160 for 1G & 3S (E10 Toyota Altezza/Lexus IS200)
• Toyota 86/Scion FR-S
• Subaru BRZ

A limited run was produced of custom front cases for Toyota T-50 bellhousing, so with this gearbox a Dellow kit might work to mate it to the A-series engine.

But other wise, use the Cut-n-Shut method.

Nissan RWD six-speed is plentiful in wrecking yards and inexpensive new ($1800) or used ($900). Use an adapter plate and bob's your uncle. Reportedly 3x stronger than an SR20DET 5-speed. It is a true direct-fifth gearbox + overdrive.

• Z33 '350Z' 2003-
• 2005- six-cylinder Frontier, Xterra, Pathfinder

Album click to view

The 1999-2002 Nissan Silvia S15 Strawberry with SR20DE/SR20DET had an optional close-ratio 5-speed + overdrive (6 forward speeds total). In AUS, the six-speed was in the Nissan 200SX Spec-R model.

S15 modified; A-series bell grafted on
Album click to view

• FS6R92A
• only 16kg heavier than a standard 1200 4spd
• Close ratio 1-5, with overdrive 6th. It is perhaps the best ratios for an A-series engine

Gear Ratio

Comparison with A-series 5-speeds

Comparison with S14 5-speed

Comparision of various Aisin AZ6 models:

Pilot Bushing

S15 5-speed FS6R92A

• 32202-B9500 BUSHING-CRANKSHAFT
• used on L, Z, VG, VQ, SR, KA, and CD engines (same as 71C bushing)
• Pilot Bushing Inside Diameter: 0.626 to .6300' (Length: .689')
• Pilot Bushing Outside Diameter: .814 to .815'

Since this is much larger in diamter than the A-series, machining is needed.

A-series crankshaft bore is for a bushing with 0.671' O.D., length .723'

• The FS6R92A input shaft end can be turned down to ~.671 O.D.
• Could the A-series crank pilot hole be bored out to .814' so the 71-Series bush can be fitted?

Input shaft end turned down to smaller diameter

Clutch Disc

FS6R92A clutch disc [all 240mm]

• 30100-85F00 9901-0011
• 30100-85F14 0011-
• Spline O.D.: 1'
• Spline: 24 teeth

There is an A-series clutch disc that is 1' x 24T: 30100-K0500.

J160 Gearbox Problems

Input Shaft Length

How far does the FS6R92A input shaft extend past the transmission face?

• 5-speed: about 17mm past the flange
• 6-speed: about 10mm inside the flange

Speedometer

S15 6-speed does not have a speedometer gear.

Clutch Release

How to connect up the clutch?

Gearshift Location

Comparision of Nissan 6-speed with long-5-speed and short 4-speed. The location of the shifter is close to the location of stumpy gearbox shifter.

J160 Gearbox To 1uz

Rear Crossmember

Use a generic crossmember to fit a 6-speed.

Propeller Shaft

The 6-speed overall length is greater than a stumpy gearbox, but not as long as a a longtail Nissan transmission.

6-speed vs 71C long vs 71B long vs F4W63 stumpy

A limited run was produced of custom front cases for Toyota T-50 bellhousing, so with this gearbox a Dellow kit might work to mate it to the A-series engine.

Aisin AZ6 with custom front case for T-50 removable bell housing. A custom input shaft is used.

Toyota J160 dimensions

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