Dually gear options from factory

[texassquarebodies]

On 81-87 2wd chevy duallys, was a 4:10 the standard ratio or an option?
Was 3:73 the only other available from the factory? I know I can get different gears aftermarket. Just wanna know what came from the factory.

I have a 83' single cab 454/400th combo. No sticker in glove box for codes. I know GT4 is 3:73 and GT5 is 4:10. I'm going to pull the cover and count gears tomorrow.

[meatwagon83]

from what i understand with the dana 70 you could get 3.42 3.73 4.10 and 4.56

[Mr.green]

I believe 3.73 were standard, all others were special order.

[Keith Seymore]

Here's a sample powertrain chart from the '87 info packet.

There is no mention of dually (RO5) vs single wheel so it does not appear that was a discriminator in axle ratio availability.

K

[GM72K10]

We had a 2wd C30 with 3.73s and a 4 speed, real dog to drive, from what I remember 4:10s were standard, we ordered the 3:73s

[meatwagon83]

mine has 373s and a th400 its anything but doggy

[GM72K10]

Had an 87 with 4:10s and the 5.7 and a 4 speed, lot easier to drive

[meatwagon83]

ahh, mine has a 454, that would be the difference

[texassquarebodies]

Thanks Keith!! I'm a dually nut!!