Teamster union member employees of the freight operation UPS Freight have overwhelmingly rejected a new contract.

The vote of 4,244 to 1,897 follows negotiators from both the union and the company ironing out a tentative five-year deal in April. The decision sends both sides back to the negotiating table.

The current pact expires on July 31.

The vote is separate from the one covering workers at UPS’ parcel operation. Votes for it are still being counted. However, so far it appears to be headed for approval, though some supplemental agreements have been or are heading toward being rejected.

The contact that was voted down is only the second for workers at UPS Freight. The first was ratified in 2008, when workers voted to join the Teamsters after UPS purchased what used to be Overnite Transportation in 2005.

Neither side has commented on the results. However, the Teamsters dissident group, Teamsters for a Democratic Union, describes the vote at UPS Freight as “an important step by standing together in solidarity.”

It said the contract had “a two-tier deal to create ‘Line Haul’ drivers at essential nonunion wages" and described improvements in wage and pension benefits as “inadequate.”

The new contact for UPS Freight offered a $2.50 per hour wage hike over five years, while those at the UPS parcel operations are voting on a $3.90 per hour wage increase over the same time period.