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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: michael.shelby.988 on January 17, 2014, 05:01:44 pm

Title: 1987 k10 silverado 305 to 350 questions??
Post by: michael.shelby.988 on January 17, 2014, 05:01:44 pm

Hello,
I have a 1987 silverado with a 305 fuel injected with a 700r4 tranny auto. I have a 350 with a 350 turbo trans coming in about a week. I was wondering if it's just a straight built up as far as putting it in? I'm Farley new to this whole motor/tranny swap but the 305 just isn't doing it for me any more "to expensive to mod and not enough power"


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Title: Re: 1987 k10 silverado 305 to 350 questions??
Post by: Boone83K10 on January 17, 2014, 06:12:44 pm

You will have to move the trans mount and get an adapter for the np208 to hook up to the th 350.

 

Title: Re: 1987 k10 silverado 305 to 350 questions??
Post by: michael.shelby.988 on January 17, 2014, 06:14:10 pm

Do you know off hand what the adapter is called?



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Title: Re: 1987 k10 silverado 305 to 350 questions??
Post by: Captkaos on January 18, 2014, 02:09:48 pm

Why not use the 700R4?

Title: Re: 1987 k10 silverado 305 to 350 questions??
Post by: michael.shelby.988 on January 18, 2014, 02:12:54 pm

My 700r4 wines after it gets warm and all my fluids are full.


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Title: Re: 1987 k10 silverado 305 to 350 questions??
Post by: Captkaos on January 18, 2014, 02:24:54 pm

Why not go through it?  Unless you know the TH350 you are getting is rebuilt I would do the same unless you are strapped for cash.

Title: Re: 1987 k10 silverado 305 to 350 questions??
Post by: michael.shelby.988 on January 18, 2014, 02:26:10 pm

The th350 has a fresh rebuild. I can't afford to rebuild the 700r4


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Title: Re: 1987 k10 silverado 305 to 350 questions??
Post by: Captkaos on January 18, 2014, 02:33:21 pm

Then you will need to find a donor for the TH350 to NP208 unless the TH350 comes with it.  Was it a 4x4 TH350?

Title: Re: 1987 k10 silverado 305 to 350 questions??
Post by: michael.shelby.988 on January 18, 2014, 02:35:27 pm

The TH350 came out of a latter model chevy truck it was a 4x4, does that mean it will be the same length?


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Title: Re: 1987 k10 silverado 305 to 350 questions??
Post by: Captkaos on January 18, 2014, 02:44:00 pm

TH350's were phased out by 1984 and out of trucks in 1982 with the 700R4 replacing it.  So there is no way it came out of a later model unless someone retro'd it in.
Find out what transfer case was bolted to it.

Title: Re: 1987 k10 silverado 305 to 350 questions??
Post by: michael.shelby.988 on January 18, 2014, 02:47:24 pm

Might have been retro'd into it? I'll did out as soon as I can.


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