87 Ram

Had a few different combos in this Ram.
Started with the original 318, 904, 2.76 gear. Low 20's but extremely gutless and could not tow.

Swap to a carbed 360 Magnum. 518 auto and 3.55.
16-18 and a best of 19 straight highway.

Lost OD on the 518. Still getting 18mpg but had to drive 100km/hr. With OD I was cruising at 120km/hr.

Best move was a swap to a NV3500 5 spd manual. Big gains in mpg. The OD ratio was similar but it was way more efficient. 23mpg straight hiway.

On the Skyway bridge here. I used to switch of the OD on the 518. With the manual trans, I could easily climb it in 5th. I also gain mph in the 1/4. 90 with the 518, 93 with the manual.