Tunnel

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Datsun 1200 originally fitted with automatic transmission has a much larger tunnel. It makes it easier to swap in 5-speeds or larger engines.

Overview

manual transmission

• 67300-H1000 ASS'Y-PANEL, dash, lower [manual transmission]
• 74300-H1010 ASS'Y-FLOOR, front [manual transmission]

automatic transmission

• 67300-H1021 ASS'Y-PANEL, dash, lower [automatic transmission]
• 74306-H1020 ASS'Y-PANEL, A/T floor cover, front [automatic transmission]
• 74300-H1021 ASS'Y-FLOOR, front [automatic transmission]

Manual floor cover (normally not a separate piece) vs auto floor cover
Comparo

Manual Tunnel is very small to fit the small stock transmissions and increase space inside the passenger compartment:

Auto Tunnel Swap

Auto tunnel is very large to fit the 71-series Automatic Transmission, but still fits under the heater box.

Auto Tunnel retrofit - can be welded into manual transmission floor & firewall:

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B210/610 Tunnel

Can fit into 1200 under heater:

NOTE: All B210 uses the larger size tunnel. 

However the B210 floor pans differ (where the transmissions mount point are). There were eight different ones used by B210. See Tunnel Comparison.

Shifter Location

Photo showing where to cut the tunnel to fit a standard "short" L-series or CA-series transmission.

Or just move the hole back and weld it back in:

71-series Modifications

S13 gearbox clearance in manual tunnel

Rear of tunnel modification:

Reverse Lamp

To fit a 60-Series Transmission 5-speed, move the mounts 115mm back:

56A Modification

to clear that nasty clutch fork im the later type 56A trans

See Also

Also see: Transmission tunnel Photo Index