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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.

1 Overview
2 Tunnel Swaps
3 Shifter Location
4 71-series Modifications
5 Reverse Lamp
6 56A Modification
7 See Also

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:

The Auto body has seperate tunnel and floor. The tunnel is spot welded in. The seam is clearly noticeable on the firewall at the back of the engine.

By contrast the manual body has one piece floor and tunnel, no joins whatsoever - the bellhousing part of tunnel is one piece with firewall.
auto std

NOTE: Unlike a B110, the B210 has a uniform floorpan between auto and manual - the stick and slushbox tunnels are the same on a B210.

Swapping Tunnel panels

The standard B110 tunnel is one piece.

The Auto tunnel is two pieces.

Modified Tunnel

Just take a big hammer and bang the tunnel sheet metal ("massage it")to get more clearance.

"massaged" floor

Or cut part of the tunnel and weld on a bigger section.

Custom Tunnels

Others have successfully bolted or welded in tunnels from:

B210
Stanza (1980 510)
180B (610)
Custom fabricated tunnels

Tunnel Swaps

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:

click

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.

A10 Tunnel

Several club members have fitted an A10 Stanza tunnel to the 1200.

unfamilia:

the satnza tunnel in- looks ok, but i wouldnt recomend it as an easy swap(my first one but piggys 3rd or 4th one). 120y was most stright forward he said, but heaps of room around this one

A10 tunnel in 1200