1984 k10 transmission questions?

[johnboy3927]

Was there ever a 3 spd automatic made by gm with overdrive? I am looking at buying a truck on craigslist and the owner says it has a 6 cylinder with a 3 speed with overdrive. Never heard of an overdrive tranny until the 700r4! Any help would be appreciated to see wether this guy just doesn't know what he is talking about or is a scammer!

[Irish_Alley]

some miscount the gears like the sm465 some say 3 speed with granny some say 4 speed and they both are right in a way just depends on how old you are. 3 speed+OD would be 4 speed (700r4)

[zieg85]

3 speed with overdrive could be the elusive NP 833 manual transmission.  A rare find indeed.

[Irish_Alley]

forgot about the manual lol

[enaberif]

While not necessarily overdrive you could get a TH350C with a lockup converter.

[LTZ C20]

While not necessarily overdrive you could get a TH350C with a lockup converter.

This, there was the TH350C, no its not an actual extra gear, it's a lock up converter but that's still in over drive. Saying the 350C doesn't count as over drive would be like saying that the 700 R4 has 5 gears not 4. The converter isn't a gear, it does however drop the rpm's, allowing for better mpg and blah blah blah.

If it's an auto 3 speed with OD, it's either a 350C or a misidentified 700R4. If it's a manual 3 speed with OD, it's a 4 speed. (Whether you prefer 3 speed with granny low or 3 speed with OD like Zieg mentioned.)

Like Irish said, depends how old you are haha.

[Irish_Alley]

maybe its my ignorance but i dont follow how the th350c could have OD. if its really a gear over drive (1:1) then locking up the tc would just be 1:1 since the 3rd gear is 1:1.

[Jason S]

For an 80's GM truck with an automatic 3-speed with overdrive, I'm thinking 700R4...