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Old 12-05-2012, 12:57 AM   #1
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Major_Tom321's Avatar
Join Date: Oct 2012
Location: Waco, Tx
Posts: 8
A couple questions...

Hey all,

I currently have a th350, I am wondering if I should keep the th350 and get it built up, or going to a 400 or 700r4. I am swapping in a 383 and it should be around 450HP and I am planning on running a 200 shot. any thoughts on what to do for the transmission?

Also, what should I do about the rear end? spool? Posi? lockers?

( I am on a budget so I can't spend a huge amount of money and I am a newbie so all help is appreciated)

1972 c10
Swapping in 383 around 450HP
planning on running a 200 shot.
gm 12 bolt one legger
coil suspension




2011 Subaru WRX, Hatch- Daily
1972 C10- Project
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Old 12-05-2012, 01:02 AM   #2
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Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,952
Re: A couple questions...

The cheapest way to get strong is a th400. I would remove the thought of a 700r4 from your head now unless you want to spend 3-4grand. A basically race ready th400 can be done for 1/4 of that. Keep in mind your money will be spent on the torque converter. You NEED a good converter with an anti ballooning plate. You need to order from a quality company such as ATI,TCI,COAN etc. Plan to spend at least 600 bucks and more than likely closer to 900-1000 dollars to get a converter that will survive 650hp in a truck.
Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.
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Old 12-05-2012, 05:48 AM   #3
crazy longhorn
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,245
Re: A couple questions...

As far as the rear diff, if you are track only a spool would be the ticket. If you plan any street time at all, a good posi (eaton would be my choice). My bro has an S-10, that is under the "knife"(9" ford diff going in), pretty sure that it will end up with a spool & we will trailor it to the track....crazyL
69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
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12 bolt 5 lug, 383, transmission

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