diff --git a/core/types/arb_types.go b/core/types/arb_types.go
index 5f379c5449..3fc08e67dd 100644
--- a/core/types/arb_types.go
+++ b/core/types/arb_types.go
@@ -347,11 +347,8 @@ func (d *ArbitrumDepositTx) setSignatureValues(chainID, v, r, s *big.Int) {
 }
 
 type ArbitrumInternalTx struct {
-	ChainId       *big.Int
-	SubType       uint8
-	Data          []byte
-	L2BlockNumber uint64
-	TxIndex       uint64
+	ChainId *big.Int
+	Data    []byte
 }
 
 func (t *ArbitrumInternalTx) txType() byte {
@@ -361,10 +358,7 @@ func (t *ArbitrumInternalTx) txType() byte {
 func (t *ArbitrumInternalTx) copy() TxData {
 	return &ArbitrumInternalTx{
 		new(big.Int).Set(t.ChainId),
-		t.SubType,
 		common.CopyBytes(t.Data),
-		t.L2BlockNumber,
-		t.TxIndex,
 	}
 }
 
diff --git a/core/types/transaction.go b/core/types/transaction.go
index aacf3faf65..56deb5d5b1 100644
--- a/core/types/transaction.go
+++ b/core/types/transaction.go
@@ -60,7 +60,8 @@ type Transaction struct {
 	time  time.Time // Time first seen locally (spam avoidance)
 
 	// Arbitrum cache
-	PosterCost *big.Int
+	PosterCost    *big.Int
+	CalldataUnits uint64
 
 	// caches
 	hash atomic.Value
diff --git a/core/types/transaction_marshalling.go b/core/types/transaction_marshalling.go
index 2c44a68732..e4fde624a5 100644
--- a/core/types/transaction_marshalling.go
+++ b/core/types/transaction_marshalling.go
@@ -47,9 +47,6 @@ type txJSON struct {
 	AccessList *AccessList  `json:"accessList,omitempty"`
 
 	// Arbitrum fields:
-	SubType          *hexutil.Uint64 `json:"subType,omitempty"`          // Internal
-	L2BlockNumber    *hexutil.Uint64 `json:"l2BlockNumber,omitempty"`    // Internal
-	TxIndex          *hexutil.Uint64 `json:"txIndex,omitempty"`          // Internal
 	From             *common.Address `json:"from,omitempty"`             // Contract SubmitRetryable Unsigned Retry
 	RequestId        *common.Hash    `json:"requestId,omitempty"`        // Contract SubmitRetryable Deposit
 	TicketId         *common.Hash    `json:"ticketId,omitempty"`         // Retry
@@ -131,10 +128,6 @@ func (t *Transaction) MarshalJSON() ([]byte, error) {
 		enc.R = (*hexutil.Big)(tx.R)
 		enc.S = (*hexutil.Big)(tx.S)
 	case *ArbitrumInternalTx:
-		subType := uint64(tx.SubType)
-		enc.SubType = (*hexutil.Uint64)(&subType)
-		enc.L2BlockNumber = (*hexutil.Uint64)(&tx.L2BlockNumber)
-		enc.TxIndex = (*hexutil.Uint64)(&tx.TxIndex)
 		enc.ChainID = (*hexutil.Big)(tx.ChainId)
 		enc.Data = (*hexutil.Bytes)(&tx.Data)
 	case *ArbitrumDepositTx:
@@ -399,24 +392,12 @@ func (t *Transaction) UnmarshalJSON(input []byte) error {
 		if dec.ChainID == nil {
 			return errors.New("missing required field 'chainId' in transaction")
 		}
-		if dec.SubType == nil {
-			return errors.New("missing required field 'subType' in transaction")
-		}
 		if dec.Data == nil {
 			return errors.New("missing required field 'input' in transaction")
 		}
-		if dec.L2BlockNumber == nil {
-			return errors.New("missing required field 'l2BlockNumber' in transaction")
-		}
-		if dec.TxIndex == nil {
-			return errors.New("missing required field 'txIndex' in transaction")
-		}
 		inner = &ArbitrumInternalTx{
-			ChainId:       (*big.Int)(dec.ChainID),
-			SubType:       uint8(*dec.SubType),
-			Data:          *dec.Data,
-			L2BlockNumber: uint64(*dec.L2BlockNumber),
-			TxIndex:       uint64(*dec.TxIndex),
+			ChainId: (*big.Int)(dec.ChainID),
+			Data:    *dec.Data,
 		}
 
 	case ArbitrumDepositTxType:
diff --git a/internal/ethapi/api.go b/internal/ethapi/api.go
index 51d302e759..c7de73ae50 100644
--- a/internal/ethapi/api.go
+++ b/internal/ethapi/api.go
@@ -1381,9 +1381,6 @@ type RPCTransaction struct {
 	S                *hexutil.Big      `json:"s"`
 
 	// Arbitrum fields:
-	SubType          *hexutil.Uint64 `json:"subType,omitempty"`          // Internal
-	L2BlockNumber    *hexutil.Uint64 `json:"l2BlockNumber,omitempty"`    // Internal
-	TxIndex          *hexutil.Uint64 `json:"txIndex,omitempty"`          // Internal
 	RequestId        *common.Hash    `json:"requestId,omitempty"`        // Contract SubmitRetryable Deposit
 	TicketId         *common.Hash    `json:"ticketId,omitempty"`         // Retry
 	RefundTo         *common.Address `json:"refundTo,omitempty"`         // SubmitRetryable Retry
@@ -1444,10 +1441,6 @@ func newRPCTransaction(tx *types.Transaction, blockHash common.Hash, blockNumber
 	// Arbitrum: support arbitrum-specific transaction types
 	switch inner := tx.GetInner().(type) {
 	case *types.ArbitrumInternalTx:
-		subType := uint64(inner.SubType)
-		result.SubType = (*hexutil.Uint64)(&subType)
-		result.L2BlockNumber = (*hexutil.Uint64)(&inner.L2BlockNumber)
-		result.TxIndex = (*hexutil.Uint64)(&inner.TxIndex)
 		result.ChainID = (*hexutil.Big)(inner.ChainId)
 	case *types.ArbitrumDepositTx:
 		result.RequestId = &inner.L1RequestId