tranny question

[psychomidgit]

Hey, I'm quite new to chevys and I'm wondering if the manual trannys have gears that are interchangeable. Right now I have a 4-speed with a granny gear, but I would rather have a 5 or 6 speed yet still retain the extremely low gear. Does anyone know if it's possible to take that first gear out and put it in a 5 speed or if GM ever made a 5-speed with that granny gear?

[DnStClr]

Go to the topics about drivetrains. ( 1st link) There's a similar question being discussed by some of the knowledge-based members that can give you some help. If you like 5 speeds you might look at a Tremac t56 transmission in the 2nd link. Welcome to the forum!
http://forum.73-87chevytrucks.com/smforum/index.php?topic=12605.0
http://www.americanpowertrain.com/

[psychomidgit]

thank you

[frogman68]

You can also get a 3 speed with OD its a A833 / My6
Bad thing is (Thanks Chris for pointing it out) it came with either the Chevy Pattern or the Chrysler Pattern to attach to the Bellhousing.

[Captkaos]

You cant modify the existing 4 speed if that is what you are asking.
You would have to get a NV4500 that is the equivalent with Overdrive.

[psychomidgit]

Thanks guys, after some research I think the NV4500 looks like the way to go. Does anyone happen to know the first gear ratio for the 4 speed I have in it now. I would look it up, but I don't know what it's called. It's the 4-speed with a granny gear.

[DnStClr]

If it's an SM465, the ratios are
1st-  6.56
2nd-  3.58
3rd-  1.70
4th-  1.0
Reverse- 6.09
 

[psychomidgit]

Yup, I think that's the one, thanks.