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Old 07-22-2009, 02:28 PM   #1 (permalink)
Rock God
 
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Building a turbo 350 on a semi budget, advice please

I've done a lot of searching and havn't gotten what I'm looking for. I'm planning on building a turbo 350 for my next rig (1/2 ton chevy cab/ frame, tons, 40's, tired tbi 350, adventually a doubler) and want a trans that will last but isn't super expensive. I'd like to spend no more than $1000 and perferably under $750 for a decent turbo 350, those figures are not including a shifter or cooler. I'll do the work my self with some help from a buddy. I know the turbo 400 is an option but I want to stay with a turbo 350 because I have one, they are cheaper to find, they weigh less, and they rob less power.

Here's the parts I'm thinking about, let me know if this looks like a decent list

The parts I'm pretty sure on

-Summit performance turbo 350 re-build kit $220
It includes kolene steels, alto red clutches, kevlar bands, new bushings, seals, and thrust washers

-6.2 Diesel torque converter $100

-TCI 321115 Reverse Manual Valve body with compression breaking $220

-Summit aluminum deep trans pan $110

The parts I'm not sure on

-Should I put a new pump in it? The tci stock pump is $84 dollars

-What do I need to upgrade sprag wise? Do I just need a heavy duty outer race or do I need the drum assembly. ATI sells a heavy duty intermediate sprag race for $41 or the upgraded direct drum for $300. I know they are a weak link, anyone have a link to what I should buy.

-Adjustable modulator, I'm thinking I don't need one with the full manual valve body or will it help?

Thanks any other advice would be appriciated. I'm looking for a trans that will handle years of trail riding without giving me a head ache. I've never really had an auto in a trail rig that hasn't given me problems.
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Old 07-22-2009, 04:12 PM   #2 (permalink)
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I am running a Th350 in my buggy that goes between 4,500#s and 5,300#s depending on what it's duty is at the time.

5 1/2 years including this years KOH race on stock rebuild parts with the TCI reverse manual valve body with no issues. I am running TBI 350, doubler.

I don't think you should have much issue with slightly upgraded parts and nothing special.
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Old 07-23-2009, 12:52 AM   #3 (permalink)
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depending on youre gearing i would look at something a bit different then the diesel convertor, with a doubler setup you would probably not be able to stop it and just drive through the brakes. I run a slight stall in mine (4.3v6, t350, 5.44 speed atlas with 4.56 gears and 39" krawlers) and the slight stall really helps with the braking and launching.
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