Need a new tranny... any ideas?

[metal_man_xl]

Hi guys, im new to the site and was wondering if i could get some advice on a new trans for my 84 2wd 1/2 ton gmc on 31's. Its got a new 350 crate thats about to be pushin about 450hp. I currently have a muncie 3 speed (was on the column, but now on the floor). I am having trouble with putting the power to the ground. I have been looking into a new 5 or 6 speed to put into it for a while now. Id like to have a quick truck on the street, but able to pull a descent size trailer every once in a while. I saw that tremec makes a 5 speed kit for around $3400, but read some threads about it not holding up to the weight of a full size truck. Would like to go all out with a 6 speed. Any help with what i should go with would be greatly appreciated. Thanks for your help.
Dave

[VileZambonie]

Have you given any thought to making it an automatic?

[camdenoilchange]

i'm looking for a tranny too, specifically a good price. I'm looking for a t-56. junkyards around here want about $1500 for one though but i may bite the bullet and go for it.

[Captkaos]

I believe you would be fine with either the TREMEC TKO (5 speed) or the T56 (6 speed)
http://www.5speedtransmissions.com/68-87_chev_truck_5sp.html

Keisler also has kits with the TKO 500, 600 or the T56. (you have to chose street rod application:
http://www.keislerauto.com/index.php?option=com_content&task=view&id=235&Itemid=125&starterMake=gm

If you want something other than TREMEC Richmond Gear makes a 5 and 6 speed also.  The use the same stuff your 3 speed does (although if you really expect 450hp, I would recommend getting a blowproof housing)
http://www.richmondgear.com/01fivespeed.html
http://www.richmondgear.com/01sixspeed.html

[Captkaos]

Keep in mind if you get a T56 and retro it to your existing Gen I SBC, there is going to be some hidden "gotchas" that you don't realize.  I posted this before so you can search on it, but it is gonna be cheaper going with a kit if you are wanting a T56.

[metal_man_xl]

So i am leaning for the 6 speed richmond, I really dont need a double OD. How much of a pain is swaping it out with the old three speed? Would i have to get a new bellhousing, clutch and flywheel? Does the cross member get relocated, or is a new one required? Thanks for everyone's help

[Captkaos]

Richmond you don't "have" to get a new bell housing, but as I said above, I would get a blow proof if you plan on abusing it.
It will require a new clutch assembly and in relation to a 3 speed the transmission mount will need to be moved back.