I take it you have never driven a 13 sp, or been around one. a 13 speed, direct, overdrive, or double overdrive, is basically a 9 speed with the top 4 holes being split. I think the only people wanting to stick one of these doesn't know anything about them.

 

and don't forget that IF it's an overdrive unit, OD probably isn't as tall as the one in your truck... so it's not going to really do anything for you anyhow

 

A 13 speed weighs around 600-700 pounds...and is about 34" long, give or take a few.

Just going from memory, but the clutch housings are ~14" diameter. SAE 0, 1, 2 or 3 bellhousings depending on the engine...IIRC the B series uses the SAE #1 but don't quote me.

 

Yup it's a twin countershaft.

 

how 'bout an NV5600 with a GV on it? or you could stack two 5600's for just a little more trouble than getting the 13 speed in and have a 36 speed...

 

man that would be badass if you make it work,
iv got an 06 4x4 auto that i want to make a 6 spd, sounds alot easier than wat ur doin but everybody i talk to says it cant be done for under like 20 grand
does anybody know how i could do it cheaper?

 

welcome to the site. I've heard the 3rd gens are a pain to swap to a manual. I've also driven quite a few 3rd gen/48re's before and after getting GOOD builds and I think I'd rather have an auto built right, it's unbelievable!

 

In the interest of keeping things practical here, you could go with a 15 double overdrive and keep or better your highway mileage. You would probably just use the top five or six when empty and whenever you wanted to pull something really heavy drop it onto the low side. Hell, in that case I would find another way to actuate the high and low sides of the trans and avoid having to have an air supply to shift it.

Really the ideal trans would be a 9 speed with a deeper O/D and tall first

 

I'm going to pull mt. everest of the face of the earth with it!

 

Yeah, I know how you can do it a HELL OF A LOT cheaper. Trade the damn thing,LOL.

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but seriously, I saw a video on Youtube, wish I had the link, of a Chevy dually some offroad shop did. It had a twin turbo 12V and a 10spd hooked up to it, it was pretty damn sweet, and this is comin from somebody that's not much of a fan of GM.