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Author Topic: th400 to th350??  (Read 3084 times)

Offline smoke

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th400 to th350??
« on: January 24, 2008, 07:22:00 pm »
hi.this is my first post.just found this site.and it is sweet.i have had many 73-87 chev's.my question is.i have a 85 blazer.and somebody put a th400 in it was in there when i bought it.well it has gone south.found a th350 with a 203 behind it.what do i need to put the 350 in there?or is it a waist of my time?i would like to put a 350 in it.but they are all 70's that i find.also i would like to stay with the 208 that is in it now.thanks for any help
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Offline VileZambonie

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Re: th400 to th350??
« Reply #1 on: January 24, 2008, 07:28:45 pm »
Welcome to the site... What exactly went wrong with the TH400? That's a really good trans vs the TH350 and if you killed a 400 I'm curious what you use the truck for? You can rebuild a 400 for a few hundred bucks which might be a good idea if you have the ability. You have a 208 behind your 400 now?
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline smoke

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Re: th400 to th350??
« Reply #2 on: January 24, 2008, 07:51:20 pm »
it's used just to beat up.kind of a shame cause it's nicer than some i see on the road.but it was way cheap.don't like the kick down stuff on it.so thought maybe a th350.plus it just has the 305 in it still.so thought it would run a little better with a th350.and yes it has the 208 in it.any ideas what to look for to put a 350 with the 208?will the 70's work that have a 203?
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Offline VileZambonie

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Re: th400 to th350??
« Reply #3 on: January 24, 2008, 08:00:07 pm »
So you have the TH400 bolted to an NP208 that someone retrofitted in there? Do you have an adapter for the 208?
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,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline smoke

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Re: th400 to th350??
« Reply #4 on: January 24, 2008, 08:07:15 pm »
ya it's a 400 to a 208.still in the truck.
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Offline Monzter

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    • Monzter Kuztomz
Re: th400 to th350??
« Reply #5 on: January 26, 2008, 09:24:36 pm »
Yup, GM used NP208 behind the TH400s. The same NP208 could be used behind the 465 manual transmissions with 32 spline out put shafts too. NP208s are not a very good t-case though. If you get a real smookin' deal on the TH350 / 203 you could add a doubler kit & a 205. This would cost more money, about $1,000 roughly, but is a great set up if you do any crawling in your truck.
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