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Author Topic: besy tranny for 350?  (Read 7334 times)

Offline lpapa15

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besy tranny for 350?
« on: August 14, 2010, 12:41:57 am »
Can someone tell me what transmission I should convert to for my 1979 chevy 350 4x4?  I want to go automatic.  Right now it is a manual 3 speed.   
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Offline beastie_3

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Re: besy tranny for 350?
« Reply #1 on: August 14, 2010, 01:08:38 am »
350, 400, or 700r4
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Offline Irish_Alley

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Re: besy tranny for 350?
« Reply #2 on: August 14, 2010, 02:15:56 am »
whats your plans ? mud, lift or just street
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Offline lpapa15

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Re: besy tranny for 350?
« Reply #3 on: August 14, 2010, 10:06:47 am »
4 inch lift, street, and a little off road. 
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Offline 78 Chevyrado

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Re: besy tranny for 350?
« Reply #4 on: August 14, 2010, 12:11:52 pm »
Quote from: lpapa15 on August 14, 2010, 10:06:47 am
4 inch lift, street, and a little off road.  

400 is strongest, but non-OD and has a (2.48) 1st gear ratio.

350 is just a light duty 3 speed, but doesn't sap as much engine power as a 400 does and has a (2.52) 1st gear ratio.

700R4 is OD, and has a lower 1st gear (3.06)-(better torque multiplication) saps less power then a 400, but for it to be strong enough, no STOCK version will do for what you want.  have a mildly built one made for you and it'll work well.  they're not much more expensive than a stock rebuild.

Though any of them can be built plenty strong, I'd probably go with a 350 or 700.  depends on if you want or need OD.  I like OD myself.
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Kenny

1978 C-20, 350/400, 3.73, Graystone Metallic, Raceline Renegade 8 Wheels - 18x8.5, 275/70R18 BFG KO's

Offline eventhorizon66

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Re: besy tranny for 350?
« Reply #5 on: August 14, 2010, 12:24:59 pm »
No brainer.  A properly rebuilt 700R4 with Transgo reprogram kit.
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'85 C10 SWB 350 700R4 TKO600

Offline Irish_Alley

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Re: besy tranny for 350?
« Reply #6 on: August 14, 2010, 11:54:59 pm »
iv always heard that bigger tires will kill an od trans fast so maybe with the mods done to it it could i guess hold up
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Offline Captkaos

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Re: besy tranny for 350?
« Reply #7 on: August 16, 2010, 05:36:03 pm »
700R4
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Offline VileZambonie

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Re: besy tranny for 350?
« Reply #8 on: August 16, 2010, 06:28:23 pm »
4L80E best option, 4L60 (700R4) second best option, 400 (3L80) thrid best option
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Offline frickenbored

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Re: besy tranny for 350?
« Reply #9 on: August 16, 2010, 10:17:53 pm »
700R4's are garbage, I had one bolted to a 305 and that thing exploded.  Get a th350.  Personally I went with a built th400 but they do take a lot of power up.
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Offline TexasRed

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Re: besy tranny for 350?
« Reply #10 on: August 17, 2010, 12:05:25 am »
who built your 700r4? What do you mean exploded? Was it setup properly? I agree, a poorly built, improperly setup 700r4 is a time bomb, but they can take many a mile in a lot of vehicles.
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Offline beastie_3

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Re: besy tranny for 350?
« Reply #11 on: August 17, 2010, 12:25:55 am »
Stock, early 700r4 are weaker than later years. But they can be built tough, especially for your application. What is your price range?
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