Greig Sneddon was snared during a large scale police probe last September.
Officers seized a huge haul of heroin, cocaine and mixing agents - including some stuffed in a tyre at the Pit Stop garage in Johnstone, Renfrewshire, and in Sneddon's car.
A judge heard how Sneddon played a vital role in a "substantial" drug dealing operation.
The 33-year-old first offender is behind bars after he admitted being concerned in the supply of heroin and cocaine.
Sneddon, of Kilpatrick Avenue, Paisley, faces a lengthy jail-term when he returns to the dock in August.
Police swooped last September 13 after a tip-off.