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[Datsun 1200 encyclopedia]

Tunnel

Revision as of 21:02, 28 June 2015; view current revision
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Categories: Body | Transmission | Automatic Transmission

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

Contents

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 vs auto floor cover
18963.jpg Comparo

Manual Tunnel is very small to fit the small stock transmissions and increase space inside the passenger compartment:
884.jpg 2133.jpg


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 7476.jpg std

8197.jpg

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.

  • 880.jpg "massaged" floor

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

  • 5008.jpg


438.jpg


Custom Tunnels

Others have successfully bolted or welded in tunnels from:

  • B210
  • Stanza (1980 510)
  • 180B (610)
    4224.jpg
  • Custom fabricated tunnels
    3039.jpg

Tunnel Swaps

Auto Tunnel Swap

Auto tunnel is very large to fit the 71-series Automatic Transmission, but still fits under the heater box.
8539.jpg

Auto Tunnel retrofit - can be welded into manual transmission floor & firewall:
18964.jpg 18965.jpg

click

click

click

18964.jpg th_0015.jpg

click

B210/610 Tunnel

Can fit into 1200 under heater:
8527.jpg 10242.jpg

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

Shifter Location

Photo showing where to cut the tunnel to fit a standard "short" L-series or CA-series transmission.
2118.jpg

12055.jpg

Or just move the hole back and weld it back in:
9582.jpg


71-series Modifications

S13 gearbox clearance in manual tunnel
4696.jpg

Rear of tunnel modification:
5064.jpg


Reverse Lamp

To fit a 60-Series Transmission 5-speed, move the mounts 115mm back:
5009.jpg 5008.jpg


56A Modification

to clear that nasty clutch fork im the later type 56A trans
5843.jpg

See Also

Also see: Transmission tunnel Photo Index