4AGE - J160 and Silvia 6th Gearset Swap

Autohaus_Z
Club4AG Enthusiast
Posts: 94
Joined: Thu Jan 10, 2013 10:45 pm
Location: San Jose, CA

4AGE - J160 and Silvia 6th Gearset Swap

Postby Autohaus_Z » Thu Feb 08, 2018 3:32 pm

Before anything I would like to extend my gratitude to @thank_you_wes for generously trading the J160 you see pictured.
Also thank you to the companies that made this possible.

Battle Garage Racing Service https://shop.battlegarage-rs.com/
SQ Engineering http://www.sq-engineering.com/
EtsuRyu / EP Importers http://www.ep-importers.com/

Support your local community and support companies that support you!

SQ Engineering makes an adapter plate (as well as many other necessary items) to bolt the AZ6/J160 6 speed manual transmission from either the 1GFE or BEAMS (Altezza/IS200) behind a 4AGE engine.

I will be performing this swap using a BEAMS J160 and will be documenting my findings here.

One area that has not been well documented is the 6th gearset swap from the Nissan S15 Silvia AZ6 into a J160 AZ6. The purpose of this gearset swap is to reduce highway RPM's due to the S15 AZ6 having the tallest 6th gear set.

Here are some 5th/6th Gear ratios for comparison.

T50 5th: 0.861
T50 MFactory 5th Ver. 2: 0.737
W58 5th: 0.783
J160 AZ6 6th: 0.869
Silvia AZ6 6th: 0.767

Here are the Nissan PN's. You will need 6th main gear, 6th counter gear, 6th Syncro (optional, buy highly recommend).
Nissan 32604-89f03, 32312-89f00, and 32341-89f00

This will not be a comprehensive guide to the 6th gearset swap (obtain and study the Altezza and S15 manuals respectively!), but rather some insight on what to expect and my personal findings. My goal is to perform the 6th gearset swap by removing the tailshaft only!

Tailshaft removed
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Misc items removed
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Measuring the for the length of puller arms I will need to pull off 6th main gear (10-11" reach).
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OEM 27016 puller set used to pull off hub. (Hub and fork will come off and on together).
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S15 Counter gear and syncro in right bottom corner
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S15 and Altezza Syncros are essentially identical. Pretty big deal depending where you are geographically and how difficult it would be for you to purchase certain foreign market parts.
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S15 6th main gear (top) splines are also correct for J160 output shaft!
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Pictured is the rear output bearing and outside c-clip which 6th main gear presses onto. The service manual wants you to have the entire output shaft removed and press 6th gear on while supporting one of the forward gears. The plan is to pull off the original 6th gear and then heat the S15 6th gear using a hot plate and press it on. Usually you are not supposed to use a bearing's outside race an a supporting surface when using a press, but with the gear heated, there should only be minimal force exerted from the hydraulic press. The ideal scenario would be that the S15 6th presses on by hand once heated (completely possible!)
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Owner. Car Make Autohaus, San Jose CA.
IG @Autohaus_Z for AE86 fun, T50 trans builds, track life, and general automotive/fabrication work!

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oldeskewltoy
Club4AG MASTER
Posts: 1682
Joined: Wed Jan 09, 2013 4:44 pm
Location: Portland, Oregon

Re: 4AGE - J160 and Silvia 6th Gearset Swap

Postby oldeskewltoy » Fri Feb 09, 2018 10:05 am

good to finally see this written up!
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

Autohaus_Z
Club4AG Enthusiast
Posts: 94
Joined: Thu Jan 10, 2013 10:45 pm
Location: San Jose, CA

Re: 4AGE - J160 and Silvia 6th Gearset Swap

Postby Autohaus_Z » Fri Feb 09, 2018 12:58 pm

oldeskewltoy wrote:good to finally see this written up!


In case you haven't seen the thread, Serendipity is doing pretty much the same.

http://www.dorikaze.net/showthread.php? ... -J160-swap

It looks like he is having a few shops do the work for him (not trying to discredit him at all), so I assume the trans tear down may not be documented as thoroughly; although I hope it will be. I'd like to see it done the "correct" way haha.
Owner. Car Make Autohaus, San Jose CA.
IG @Autohaus_Z for AE86 fun, T50 trans builds, track life, and general automotive/fabrication work!

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