diff --git a/docs/reference/migrations.rst b/docs/reference/migrations.rst
index 7d33ebad3..eb97fba2d 100644
--- a/docs/reference/migrations.rst
+++ b/docs/reference/migrations.rst
@@ -3,6 +3,17 @@ Migration Guide
 
 This page can help when migrating Taskgraph across major versions.
 
+23.x -> 24.x
+------------
+
+* You must now pass in `--allow-parameter-override` into Decision tasks that
+  need to load the `try_task_config.json` file at the root of the repo.
+* `taskgraph.parameters.Parameters.is_try()` is removed. Either in-line the old
+  method to a utility or use alternative logic.
+* Level 1 artifacts' default expiry changed from "1 year" to "28 days". If
+  needed, set `task-expires-after` in `taskcluster/config.yml` to adjust the
+  default back.
+
 22.x -> 23.x
 ------------
 
diff --git a/packages/pytest-taskgraph/src/pytest_taskgraph/fixtures/gen.py b/packages/pytest-taskgraph/src/pytest_taskgraph/fixtures/gen.py
index ac1bee702..53d762943 100644
--- a/packages/pytest-taskgraph/src/pytest_taskgraph/fixtures/gen.py
+++ b/packages/pytest-taskgraph/src/pytest_taskgraph/fixtures/gen.py
@@ -123,9 +123,6 @@ def graph_config(datadir):
 class FakeParameters(dict):
     strict = True
 
-    def is_try(self):
-        return self["level"] != 3
-
     def file_url(self, path, pretty=False):
         return path
 
diff --git a/src/taskgraph/decision.py b/src/taskgraph/decision.py
index 4a35ca2d1..a27eda672 100644
--- a/src/taskgraph/decision.py
+++ b/src/taskgraph/decision.py
@@ -252,31 +252,27 @@ def get_decision_parameters(graph_config, options):
         assert callable(decision_params)
         decision_params(graph_config, parameters)
 
-    if options.get("try_task_config_file"):
-        task_config_file = os.path.abspath(options.get("try_task_config_file"))
-    else:
-        # if try_task_config.json is present, load it
-        task_config_file = os.path.join(os.getcwd(), "try_task_config.json")
-
-    # load try settings
-    if ("try" in project and options["tasks_for"] == "hg-push") or options[
-        "tasks_for"
-    ] == "github-pull-request":
-        set_try_config(parameters, task_config_file)
-
-    # load extra parameters from vcs note if able
-    note_ref = "refs/notes/decision-parameters"
-    if options.get("allow_parameter_override") and (
-        note_params := repo.get_note(note_ref, parameters["head_repository"])
-    ):
-        try:
-            note_params = json.loads(note_params)
-            logger.info(
-                f"Overriding parameters from {note_ref}:\n{json.dumps(note_params, indent=2)}"
-            )
-            parameters.update(note_params)
-        except ValueError as e:
-            raise Exception(f"Failed to parse {note_ref} as JSON: {e}") from e
+    # load extra parameters from file or vcs note if able
+    if options.get("allow_parameter_override"):
+        note_ref = "refs/notes/decision-parameters"
+        if options.get("try_task_config_file"):
+            task_config_file = os.path.abspath(options.get("try_task_config_file"))
+        else:
+            # if try_task_config.json is present, load it
+            task_config_file = os.path.join(os.getcwd(), "try_task_config.json")
+
+        if os.path.isfile(task_config_file):
+            set_try_config(parameters, task_config_file)
+
+        elif note_params := repo.get_note(note_ref, parameters["head_repository"]):
+            try:
+                note_params = json.loads(note_params)
+                logger.info(
+                    f"Overriding parameters from {note_ref}:\n{json.dumps(note_params, indent=2)}"
+                )
+                parameters.update(note_params)
+            except ValueError as e:
+                raise Exception(f"Failed to parse {note_ref} as JSON: {e}") from e
 
     result = Parameters(**parameters)
     result.check()
@@ -284,23 +280,22 @@ def get_decision_parameters(graph_config, options):
 
 
 def set_try_config(parameters, task_config_file):
-    if os.path.isfile(task_config_file):
-        logger.info(f"using try tasks from {task_config_file}")
-        with open(task_config_file) as fh:
-            task_config = json.load(fh)
-        task_config_version = task_config.pop("version")
-        if task_config_version == 2:
-            validate_schema(
-                try_task_config_schema_v2,
-                task_config,
-                "Invalid v2 `try_task_config.json`.",
-            )
-            parameters.update(task_config["parameters"])
-            return
-        else:
-            raise Exception(
-                f"Unknown `try_task_config.json` version: {task_config_version}"
-            )
+    logger.info(f"using try tasks from {task_config_file}")
+    with open(task_config_file) as fh:
+        task_config = json.load(fh)
+    task_config_version = task_config.pop("version")
+    if task_config_version == 2:
+        validate_schema(
+            try_task_config_schema_v2,
+            task_config,
+            "Invalid v2 `try_task_config.json`.",
+        )
+        parameters.update(task_config["parameters"])
+        return
+    else:
+        raise Exception(
+            f"Unknown `try_task_config.json` version: {task_config_version}"
+        )
 
 
 def write_artifact(filename, data):
diff --git a/src/taskgraph/parameters.py b/src/taskgraph/parameters.py
index 64f6065c2..db51e48b2 100644
--- a/src/taskgraph/parameters.py
+++ b/src/taskgraph/parameters.py
@@ -273,13 +273,6 @@ def __getitem__(self, k):
         except KeyError:
             raise KeyError(f"taskgraph parameter {k!r} not found")
 
-    def is_try(self):
-        """
-        Determine whether this graph is being built on a try project or for
-        `mach try fuzzy`.
-        """
-        return "try" in self["project"] or self["tasks_for"] == "github-pull-request"
-
     @property
     def moz_build_date(self):
         # XXX self["moz_build_date"] is left as a string because:
diff --git a/src/taskgraph/transforms/docker_image.py b/src/taskgraph/transforms/docker_image.py
index 643be20e5..9363de2d0 100644
--- a/src/taskgraph/transforms/docker_image.py
+++ b/src/taskgraph/transforms/docker_image.py
@@ -130,7 +130,7 @@ def fill_template(config, tasks):
                 "artifact_prefix": "public",
             },
             "always-target": True,
-            "expires-after": expires if config.params.is_try() else "1 year",
+            "expires-after": expires if config.params["level"] == "1" else "1 year",
             "scopes": [],
             "run-on-projects": [],
             "worker-type": "images",
diff --git a/src/taskgraph/transforms/task.py b/src/taskgraph/transforms/task.py
index 1c3ceb972..28b85e180 100644
--- a/src/taskgraph/transforms/task.py
+++ b/src/taskgraph/transforms/task.py
@@ -457,12 +457,10 @@ def build_docker_worker_payload(config, task, task_def):
         else:
             suffix = cache_version
 
-        skip_untrusted = config.params.is_try() or level == 1
-
         for cache in worker["caches"]:
             # Some caches aren't enabled in environments where we can't
             # guarantee certain behavior. Filter those out.
-            if cache.get("skip-untrusted") and skip_untrusted:
+            if cache.get("skip-untrusted") and level == 1:
                 continue
 
             name = "{trust_domain}-level-{level}-{name}-{suffix}".format(
@@ -484,7 +482,7 @@ def build_docker_worker_payload(config, task, task_def):
     if run_task and worker.get("volumes"):
         payload["env"]["TASKCLUSTER_VOLUMES"] = ";".join(sorted(worker["volumes"]))
 
-    if payload.get("cache") and skip_untrusted:  # type: ignore
+    if payload.get("cache") and level == 1:  # type: ignore
         payload["env"]["TASKCLUSTER_UNTRUSTED_CACHES"] = "1"
 
     if features:
@@ -999,7 +997,7 @@ def build_task(config, tasks):
         if "expires-after" not in task:
             task["expires-after"] = (
                 config.graph_config._config.get("task-expires-after", "28 days")
-                if config.params.is_try()
+                if config.params["level"] == "1"
                 else "1 year"
             )