--- a/taskcluster/ci/b2g-device/kind.yml
+++ b/taskcluster/ci/b2g-device/kind.yml
@@ -39,60 +39,56 @@ job-defaults:
 
 
 jobs:
     aries-eng/opt:
         description: "B2G Aries Opt"
         index:
             product: b2g
             job-name:
-                gecko-v1: aries-eng.opt
                 gecko-v2: aries-eng-opt
         treeherder:
             platform: b2g-device-image/opt
             symbol: Aries(Be)
         run:
             using: phone-builder
             target: aries
 
     aries-eng/debug:
         description: "B2G Aries Debug"
         index:
             product: b2g
             job-name:
-                gecko-v1: aries.debug
                 gecko-v2: aries-debug
         treeherder:
             platform: b2g-device-image/debug
             symbol: Aries(Bd)
         run:
             using: phone-builder
             target: aries
             debug: true
 
     nexus-5l-eng/opt:
         description: "B2G Nexus 5-L Opt"
         index:
             product: b2g
             job-name:
-                gecko-v1: nexus-5-l-eng.opt
                 gecko-v2: nexus-5-l-eng-opt
         treeherder:
             platform: b2g-device-image/opt
             symbol: Nexus 5-L(Be)
         run:
             using: phone-builder
             target: nexus-5-l
 
     nexus-5l-eng/debug:
         description: "B2G Nexus 5-L Debug"
         index:
             product: b2g
             job-name:
-                gecko-v1: nexus-5-l-eng.debug
                 gecko-v2: nexus-5-l-eng-debug
         treeherder:
             platform: b2g-device-image/debug
             symbol: Nexus 5-L(Bd)
         run:
             using: phone-builder
             target: nexus-5-l
             debug: true

--- a/taskcluster/ci/build/android.yml
+++ b/taskcluster/ci/build/android.yml
@@ -1,15 +1,14 @@
 android-api-15/debug:
     description: "Android 4.0 API15+ Debug"
     index:
         product: mobile
         job-name:
             buildbot: android-api-15-debug
-            gecko-v1: android-api-15.debug
             gecko-v2: android-api-15-debug
     treeherder:
         platform: android-4-0-armv7-api15/debug
         symbol: tc(B)
     worker-type: aws-provisioner-v1/android-api-15
     worker:
         implementation: docker-worker
         max-run-time: 7200

--- a/taskcluster/ci/build/linux.yml
+++ b/taskcluster/ci/build/linux.yml
@@ -49,17 +49,16 @@ linux64/pgo:
         need-xvfb: true
 
 linux64/debug:
     description: "Linux64 Debug"
     index:
         product: firefox
         job-name:
             buildbot: linux64-debug
-            gecko-v1: linux64.debug
             gecko-v2: linux64-debug
     treeherder:
         platform: linux64/debug
         symbol: tc(B)
     worker-type: aws-provisioner-v1/gecko-{level}-b-linux
     worker:
         implementation: docker-worker
         max-run-time: 36000

--- a/taskcluster/ci/build/mulet.yml
+++ b/taskcluster/ci/build/mulet.yml
@@ -1,15 +1,14 @@
 linux64-mulet/debug:
     description: "Linux64 Mulet Debug"
     index:
         product: b2g
         job-name:
             buildbot: linux64-mulet
-            gecko-v1: mulet.dbg
             gecko-v2: mulet-dbg
     treeherder:
         platform: mulet-linux64/debug  # See bug 1286086
         symbol: B
         tier: 3
     worker-type: aws-provisioner-v1/mulet-debug
     worker:
         implementation: docker-worker
@@ -20,17 +19,16 @@ linux64-mulet/debug:
         tooltool-manifest: b2g/dev/config/tooltool-manifests/linux64/releng.manifest
 
 linux64-mulet/opt:
     description: "Linux64 Mulet Opt"
     index:
         product: b2g
         job-name:
             buildbot: linux64-mulet
-            gecko-v1: mulet.opt
             gecko-v2: mulet-opt
     treeherder:
         platform: mulet-linux64/opt # ?!?%
         symbol: B
         tier: 3
     worker-type: aws-provisioner-v1/mulet-opt
     worker:
         implementation: docker-worker

--- a/taskcluster/ci/hazard/kind.yml
+++ b/taskcluster/ci/hazard/kind.yml
@@ -20,17 +20,16 @@ job-defaults:
         docker-image: {in-tree: desktop-build}
 
 jobs:
     linux64-shell-haz/debug:
         description: "JS Shell Hazard Analysis Linux"
         index:
             product: firefox
             job-name:
-                gecko-v1: shell-haz.debug
                 gecko-v2: shell-haz-debug
         treeherder:
             platform: linux64/debug
             symbol: SM-tc(H)
         run:
             using: hazard
             tooltool-manifest: "browser/config/tooltool-manifests/linux64/hazard.manifest"
             command: >
@@ -42,17 +41,16 @@ jobs:
                 - js/public/**
                 - js/src/**
 
     linux64-haz/debug:
         description: "Browser Hazard Analysis Linux"
         index:
             product: firefox
             job-name:
-                gecko-v1: browser-haz.debug
                 gecko-v2: browser-haz-debug
         treeherder:
             platform: linux64/debug
             symbol: tc(H)
         run:
             using: hazard
             tooltool-manifest: "browser/config/tooltool-manifests/linux64/hazard.manifest"
             mozconfig: "browser/config/mozconfigs/linux64/hazards"
@@ -62,17 +60,16 @@ jobs:
                 && ./build-haz-linux.sh --project browser $HOME/workspace
 
     linux64-mulet-haz/debug:
         description: "Mulet Hazard Analysis Linux"
         index:
             product: b2g
             job-name:
                 buildbot: linux64-haz-mulet
-                gecko-v1: mulet-haz.debug
                 gecko-v2: mulet-haz-debug
         treeherder:
             platform: mulet-linux64/opt
             symbol: tc(H)
             tier: 3
         # don't run anywhere by default, but still available via try: -b d -p linux64-mulet-haz
         run-on-projects: []
         worker:

--- a/taskcluster/ci/nightly-fennec/docker_build.yml
+++ b/taskcluster/ci/nightly-fennec/docker_build.yml
@@ -1,19 +1,15 @@
 $inherits:
   from: 'build.yml'
 
 
 task:
   workerType: b2gbuild
 
-  routes:
-    - 'index.gecko.v1.{{project}}.revision.linux.{{head_rev}}.{{build_name}}.{{build_type}}'
-    - 'index.gecko.v1.{{project}}.latest.linux.{{build_name}}.{{build_type}}'
-
   scopes:
     # docker build tasks use tc-vcs so include the scope.
     - 'docker-worker:cache:level-{{level}}-{{project}}-tc-vcs'
 
   payload:
 
     cache:
       level-{{level}}-{{project}}-tc-vcs: '/home/worker/.tc-vcs'

--- a/taskcluster/ci/spidermonkey/kind.yml
+++ b/taskcluster/ci/spidermonkey/kind.yml
@@ -31,17 +31,16 @@ job-defaults:
             - js/src/**
 
 jobs:
     sm-package/opt:
         description: "Spidermonkey source package and test"
         index:
             job-name:
                 buildbot: sm-plain
-                gecko-v1: sm-package.opt
                 gecko-v2: sm-package-opt
         treeherder:
             symbol: SM-tc(pkg)
         run:
             using: spidermonkey-package
             spidermonkey-variant: plain
         run-on-projects:
             - integration
@@ -69,17 +68,16 @@ jobs:
                 - toolkit/mozapps/installer/package-name.mk
                 - toolkit/mozapps/installer/upload-files.mk
 
     sm-plain/debug:
         description: "Spidermonkey Plain"
         index:
             job-name:
                 buildbot: sm-plain
-                gecko-v1: sm-plaindebug.debug
                 gecko-v2: sm-plaindebug-debug
         treeherder:
             platform: linux64/debug
             symbol: SM-tc(p)
         run:
             spidermonkey-variant: plaindebug
         run-on-projects:
             - integration
@@ -97,124 +95,116 @@ jobs:
             - integration
             - release
 
     sm-arm-sim/debug:
         description: "Spidermonkey ARM sim"
         index:
             job-name:
                 buildbot: sm-plain
-                gecko-v1: sm-arm-sim.debug
                 gecko-v2: sm-arm-sim-debug
         treeherder:
             symbol: SM-tc(arm)
         run:
             spidermonkey-variant: arm-sim
         run-on-projects:
             - integration
             - release
 
     sm-arm64-sim/debug:
         description: "Spidermonkey ARM64 sim"
         index:
             job-name:
                 buildbot: sm-plain
-                gecko-v1: sm-arm64-sim.debug
                 gecko-v2: sm-arm64-sim-debug
         treeherder:
             symbol: SM-tc(arm64)
         run:
             spidermonkey-variant: arm64-sim
         run-on-projects:
             - integration
             - release
 
     sm-asan/opt:
         description: "Spidermonkey Address Sanitizer"
         index:
             job-name:
                 buildbot: sm-plain
-                gecko-v1: sm-asan.opt
                 gecko-v2: sm-asan-opt
         treeherder:
             symbol: SM-tc(asan)
         run:
             spidermonkey-variant: asan
             tooltool-manifest: browser/config/tooltool-manifests/linux64/asan.manifest
         run-on-projects:
             - integration
             - release
 
     sm-compacting/debug:
         description: "Spidermonkey Compacting"
         index:
             job-name:
                 buildbot: sm-plain
-                gecko-v1: sm-compacting.debug
                 gecko-v2: sm-compacting-debug
         treeherder:
             symbol: SM-tc(cgc)
         run:
             spidermonkey-variant: compacting
         run-on-projects:
             - integration
             - release
 
     sm-msan/opt:
         description: "Spidermonkey Memory Sanitizer"
         index:
             job-name:
                 buildbot: sm-plain
-                gecko-v1: sm-msan.opt
                 gecko-v2: sm-msan-opt
         treeherder:
             symbol: SM-tc(msan)
         run:
             spidermonkey-variant: msan
             tooltool-manifest: browser/config/tooltool-manifests/linux64/msan.manifest
         run-on-projects:
             - integration
             - release
 
     sm-tsan/opt:
         description: "Spidermonkey Thread Sanitizer"
         index:
             job-name:
                 buildbot: sm-plain
-                gecko-v1: sm-tsan.opt
                 gecko-v2: sm-tsan-opt
         treeherder:
             symbol: SM-tc(tsan)
             tier: 3
         run-on-projects: []
         run:
             spidermonkey-variant: tsan
             tooltool-manifest: browser/config/tooltool-manifests/linux64/tsan.manifest
 
     sm-rootanalysis/debug:
         description: "Spidermonkey Root Analysis"
         index:
             job-name:
                 buildbot: sm-plain
-                gecko-v1: sm-rootanalysis.debug
                 gecko-v2: sm-rootanalysis-debug
         treeherder:
             symbol: SM-tc(r)
         run:
             spidermonkey-variant: rootanalysis
         run-on-projects:
             - integration
             - release
 
     sm-nonunified/debug:
         description: "Spidermonkey Non-Unified Debug"
         index:
             job-name:
                 buildbot: sm-plain
-                gecko-v1: sm-nonunified.debug
                 gecko-v2: sm-nonunified-debug
         treeherder:
             platform: linux64/debug
             symbol: SM-tc(nu)
         run:
             spidermonkey-variant: nonunified
         run-on-projects:
             - integration

--- a/taskcluster/taskgraph/transforms/job/mulet.py
+++ b/taskcluster/taskgraph/transforms/job/mulet.py
@@ -91,19 +91,15 @@ def docker_worker_mulet_simulator(config
     # assumes the builder image (which contains the gecko checkout command)
     taskdesc['worker']['docker-image'] = {"in-tree": "builder"}
 
     worker['taskcluster-proxy'] = False
 
     docker_worker_add_public_artifacts(config, job, taskdesc)
     docker_worker_add_gecko_vcs_env_vars(config, job, taskdesc)
 
-    taskdesc.setdefault('routes', []).extend([
-        'index.gecko.v1.{project}.latest.simulator.opt'.format(**config.params),
-    ])
-
     shell_command = run['shell-command'].format(**config.params)
 
     worker['command'] = [
         "/bin/bash",
         "-exc",
         {'task-reference': shell_command},
     ]

--- a/taskcluster/taskgraph/transforms/task.py
+++ b/taskcluster/taskgraph/transforms/task.py
@@ -95,17 +95,16 @@ task_description_schema = Schema({
             basestring,
 
             # otherwise, give separate names for each of the legacy index
             # routes; if a name is omitted, no corresponding route will be
             # created.
             {
                 # the name as it appears in buildbot routes
                 Optional('buildbot'): basestring,
-                Optional('gecko-v1'): basestring,
                 Required('gecko-v2'): basestring,
             }
         ),
     },
 
     # The `run_on_projects` attribute, defaulting to "all".  This dictates the
     # projects on which this task should be included in the target task set.
     # See the attributes documentation for details.
@@ -251,21 +250,16 @@ GROUP_NAMES = {
 }
 UNKNOWN_GROUP_NAME = "Treeherder group {} has no name; add it to " + __file__
 
 BUILDBOT_ROUTE_TEMPLATES = [
     "index.buildbot.branches.{project}.{job-name-buildbot}",
     "index.buildbot.revisions.{head_rev}.{project}.{job-name-buildbot}",
 ]
 
-V1_ROUTE_TEMPLATES = [
-    "index.gecko.v1.{project}.latest.linux.{job-name-gecko-v1}",
-    "index.gecko.v1.{project}.revision.linux.{head_rev}.{job-name-gecko-v1}",
-]
-
 V2_ROUTE_TEMPLATES = [
     "index.gecko.v2.{project}.latest.{product}.{job-name-gecko-v2}",
     "index.gecko.v2.{project}.pushdate.{pushdate_long}.{product}.{job-name-gecko-v2}",
     "index.gecko.v2.{project}.revision.{head_rev}.{product}.{job-name-gecko-v2}",
 ]
 
 # the roots of the treeherder routes, keyed by treeherder environment
 TREEHERDER_ROUTE_ROOTS = {
@@ -403,17 +397,16 @@ def add_index_routes(config, tasks):
             continue
 
         job_name = index['job-name']
         # unpack the v2 name to v1 and buildbot names
         if isinstance(job_name, basestring):
             base_name, type_name = job_name.rsplit('-', 1)
             job_name = {
                 'buildbot': base_name,
-                'gecko-v1': '{}.{}'.format(base_name, type_name),
                 'gecko-v2': '{}-{}'.format(base_name, type_name),
             }
 
         if job_name['gecko-v2'] not in JOB_NAME_WHITELIST:
             raise Exception(JOB_NAME_WHITELIST_ERROR.format(job_name['gecko-v2']))
 
         subs = config.params.copy()
         for n in job_name:
@@ -421,19 +414,16 @@ def add_index_routes(config, tasks):
         subs['pushdate_long'] = time.strftime(
             "%Y.%m.%d.%Y%m%d%H%M%S",
             time.gmtime(config.params['pushdate']))
         subs['product'] = index['product']
 
         if 'buildbot' in job_name:
             for tpl in BUILDBOT_ROUTE_TEMPLATES:
                 routes.append(tpl.format(**subs))
-        if 'gecko-v1' in job_name:
-            for tpl in V1_ROUTE_TEMPLATES:
-                routes.append(tpl.format(**subs))
         if 'gecko-v2' in job_name:
             for tpl in V2_ROUTE_TEMPLATES:
                 routes.append(tpl.format(**subs))
 
         # rank is zero for non-tier-1 tasks and based on pushid for others;
         # this sorts tier-{2,3} builds below tier-1 in the index
         tier = task.get('treeherder', {}).get('tier', 3)
         task.setdefault('extra', {})['index'] = {