S14 Silvia S15 6-Speed Transmission Swap Guide
S14 to S15 6-Speed Swap
Legal in 0
Nissan S14 Silvia
S14 (N/A)
Power
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0-60
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Top Speed
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Current Market Value
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🇺🇸 US Import Information
This vehicle will become legal to import in 0 under the 25-year exemption rule. Check our import guide for details on the process.
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Expert DIY
10-14 hours
S15 6-Speed Manual Transmission Swap (RB-series or stock S15)
Nissan S14 Silvia (S14)
Estimated Cost
$2,600-$4,200
Parts: $1,800-$2,800
Labor: $800-$1,400
Horsepower
0
Torque
0
Response
Closer gear ratios, better acceleration, 6th gear for highway cruising, stronger transmission for higher HP
Prerequisites
- • Transmission jack
- • S15 transmission (used JDM)
- • New clutch kit
- • S15 transmission crossmember
Installation Progress0%
Installation Steps
1
Disconnect battery
5 min
Safety first
2
Remove shifter assembly
30 min
3
Remove driveshaft
30 min
4
Disconnect clutch slave cylinder
15 min
5
Disconnect starter
15 min
6
Support transmission with jack
15 min
7
Unbolt transmission crossmember
20 min
8
Remove bellhousing bolts (10)
1 hour
9
Slide transmission back and lower
30 min
10
Remove stock flywheel and clutch
30 min
11
Install S15 flywheel with new bolts
20 min
12
Install new clutch assembly
30 min
13
Mount S15 6-speed to engine
45 min
14
Install S15 crossmember
20 min
15
Reconnect slave cylinder, starter, driveshaft
45 min
16
Fill transmission fluid
15 min
17
Bleed clutch system
20 min
18
Reinstall shifter, test shift pattern
30 min
Parts Required
All parts needed for this modification
S15 6-speed transmission (used JDM)
Quantity: 1 • $1,400-$2,200
S15 transmission crossmember
Quantity: 1 • $180
S15 shifter assembly
Quantity: 1 • $120
South Bend Clutch OFE-HD
Quantity: 1 • $520
Nissan S15 flywheel (or lightweight)
Quantity: 1 • $380
Transmission mount
Quantity: 1 • $65
Tools Required
Transmission jack
Rental: $30/day
Rental
Clutch alignment tool
Common
Impact wrench
Rental: $20/day
Rental
Supporting Modifications
Additional mods recommended or required for optimal performance
Short shifter kit
optional
Crisper shift action
ACL race engine bearings
optional
While you are in there for bigger hp
Tuning Requirements
ECU Flash Required
Dyno Tune Required
Estimated Tuning Cost
$0
No ECU changes required. New clutch break-in 500 miles. Check transmission fluid after first drive.
Disclosure: We may earn a commission from purchases made through affiliate links on this page. This helps support our comprehensive modification guides. See our full disclosure policy.