diff --git a/packages/transaction-controller/src/TransactionController.test.ts b/packages/transaction-controller/src/TransactionController.test.ts
index e597c13e34..f452477844 100644
--- a/packages/transaction-controller/src/TransactionController.test.ts
+++ b/packages/transaction-controller/src/TransactionController.test.ts
@@ -1,6 +1,4 @@
 /* eslint-disable jest/expect-expect */
-
-import { Common } from '@ethereumjs/common';
 import {
   ChainId,
   NetworkType,
@@ -23,7 +21,7 @@ import type {
   TransactionControllerMessenger,
   TransactionConfig,
 } from './TransactionController';
-import { TransactionController, HARDFORK } from './TransactionController';
+import { TransactionController } from './TransactionController';
 import type { TransactionMeta } from './types';
 import { WalletDevice, TransactionStatus } from './types';
 import { ESTIMATE_GAS_ERROR } from './utils';
@@ -1402,7 +1400,9 @@ describe('TransactionController', () => {
 
   describe('stopTransaction', () => {
     it('rejects result promise', async () => {
-      const controller = newController();
+      const controller = newController({
+        network: MOCK_LINEA_GOERLI_NETWORK,
+      });
 
       const { result, transactionMeta } = await controller.addTransaction({
         from: ACCOUNT_MOCK,
@@ -1432,7 +1432,9 @@ describe('TransactionController', () => {
 
   describe('speedUpTransaction', () => {
     it('creates additional transaction with increased gas', async () => {
-      const controller = newController();
+      const controller = newController({
+        network: MOCK_LINEA_MAINNET_NETWORK,
+      });
 
       const { transactionMeta } = await controller.addTransaction({
         from: ACCOUNT_MOCK,
@@ -1498,53 +1500,6 @@ describe('TransactionController', () => {
     });
   });
 
-  describe('getCommonConfiguration', () => {
-    it('should get the common  network configuration for mainnet', async () => {
-      const controller = new TransactionController({
-        getNetworkState: () => MOCK_MAINNET_NETWORK.state,
-        onNetworkStateChange: MOCK_MAINNET_NETWORK.subscribe,
-        provider: MOCK_MAINNET_NETWORK.provider,
-        blockTracker: MOCK_MAINNET_NETWORK.blockTracker,
-        messenger: messengerMock,
-      });
-
-      const config = await controller.getCommonConfiguration();
-      expect(config).toStrictEqual(
-        new Common({ chain: 'mainnet', hardfork: HARDFORK }),
-      );
-    });
-
-    it.each([
-      ['linea-mainnet', MOCK_LINEA_MAINNET_NETWORK, 59144],
-      ['linea-goerli', MOCK_LINEA_GOERLI_NETWORK, 59140],
-    ])(
-      'should get a custom network configuration for %s',
-      async (
-        _,
-        { state, subscribe, provider, blockTracker }: MockNetwork,
-        chainId: number,
-      ) => {
-        const controller = new TransactionController({
-          getNetworkState: () => state,
-          onNetworkStateChange: subscribe,
-          provider,
-          blockTracker,
-          messenger: messengerMock,
-        });
-
-        const config = controller.getCommonConfiguration();
-        expect(config).toStrictEqual(
-          Common.custom({
-            name: undefined,
-            chainId,
-            networkId: chainId,
-            defaultHardfork: HARDFORK,
-          }),
-        );
-      },
-    );
-  });
-
   describe('initApprovals', () => {
     it('creates approvals for all unapproved transaction', async () => {
       const transaction = {
diff --git a/packages/transaction-controller/src/TransactionController.ts b/packages/transaction-controller/src/TransactionController.ts
index 51f018a268..c860083c1a 100644
--- a/packages/transaction-controller/src/TransactionController.ts
+++ b/packages/transaction-controller/src/TransactionController.ts
@@ -393,13 +393,6 @@ export class TransactionController extends BaseController<
     };
   }
 
-  prepareUnsignedEthTx(txParams: Record<string, unknown>): TypedTransaction {
-    return TransactionFactory.fromTxData(txParams, {
-      common: this.getCommonConfiguration(),
-      freeze: false,
-    });
-  }
-
   /**
    * Creates approvals for all unapproved transactions persisted.
    */
@@ -421,40 +414,6 @@ export class TransactionController extends BaseController<
     }
   }
 
-  /**
-   * `@ethereumjs/tx` uses `@ethereumjs/common` as a configuration tool for
-   * specifying which chain, network, hardfork and EIPs to support for
-   * a transaction. By referencing this configuration, and analyzing the fields
-   * specified in txParams, @ethereumjs/tx is able to determine which EIP-2718
-   * transaction type to use.
-   *
-   * @returns {Common} common configuration object
-   */
-
-  getCommonConfiguration(): Common {
-    const {
-      networkId,
-      providerConfig: { type: chain, chainId, nickname: name },
-    } = this.getNetworkState();
-
-    if (
-      chain !== RPC &&
-      chain !== NetworkType['linea-goerli'] &&
-      chain !== NetworkType['linea-mainnet']
-    ) {
-      return new Common({ chain, hardfork: HARDFORK });
-    }
-
-    const customChainParams: Partial<ChainConfig> = {
-      name,
-      chainId: parseInt(chainId, 16),
-      networkId: networkId === null ? NaN : parseInt(networkId, undefined),
-      defaultHardfork: HARDFORK,
-    };
-
-    return Common.custom(customChainParams);
-  }
-
   /**
    * Attempts to cancel a transaction based on its ID by setting its status to "rejected"
    * and emitting a `<tx.id>:finished` hub event.
@@ -1289,9 +1248,50 @@ export class TransactionController extends BaseController<
   } {
     const { networkId, providerConfig } = this.getNetworkState();
     const chainId = providerConfig?.chainId;
-
     return { networkId, chainId };
   }
+
+  private prepareUnsignedEthTx(
+    txParams: Record<string, unknown>,
+  ): TypedTransaction {
+    return TransactionFactory.fromTxData(txParams, {
+      common: this.getCommonConfiguration(),
+      freeze: false,
+    });
+  }
+
+  /**
+   * `@ethereumjs/tx` uses `@ethereumjs/common` as a configuration tool for
+   * specifying which chain, network, hardfork and EIPs to support for
+   * a transaction. By referencing this configuration, and analyzing the fields
+   * specified in txParams, @ethereumjs/tx is able to determine which EIP-2718
+   * transaction type to use.
+   *
+   * @returns common configuration object
+   */
+  private getCommonConfiguration(): Common {
+    const {
+      networkId,
+      providerConfig: { type: chain, chainId, nickname: name },
+    } = this.getNetworkState();
+
+    if (
+      chain !== RPC &&
+      chain !== NetworkType['linea-goerli'] &&
+      chain !== NetworkType['linea-mainnet']
+    ) {
+      return new Common({ chain, hardfork: HARDFORK });
+    }
+
+    const customChainParams: Partial<ChainConfig> = {
+      name,
+      chainId: parseInt(chainId, 16),
+      networkId: networkId === null ? NaN : parseInt(networkId, undefined),
+      defaultHardfork: HARDFORK,
+    };
+
+    return Common.custom(customChainParams);
+  }
 }
 
 export default TransactionController;