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09-18-2006, 03:55 PM
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#1 |
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Registered User
Join Date: Nov 2005
Location: Kansas
Posts: 3
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Transmission Questions
I have an 88 350 3/4 ton suburban with an ailing 3spd. turbo 400 transmision. What all would be involved in the swap to a 4spd. overdrive 700r4? I no longer tow with it and would like the mileage benifits of the extra gear. I know half tons of this era were equiped with the auto 4spd. Are the transfer cases and related linkage the same? I am kind of hoping this is a bolt in deal.
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09-18-2006, 04:14 PM
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#2 |
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67-72 parts finder
Join Date: Aug 2006
Location: southeast mo
Posts: 788
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Re: Transmission Questions
well on a 4x4 i'm unsure i know the 700r4 has a different length to it but i'm not sure what all is involved i see it done but in reverse to how your doing it you will have to setup the kickdown cable on it since the 400 is electric kickdown
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  1969 chevy shortstep 2wd (under construction)1981 chevy scottsdale lwb 2wd (parts chaser) 2004 pontiac gto (daily driver) 2004 pontiac grand prix gt (the ol ladys car) 1985 chevy short wide 1970 chevy c10 lwb (another parts rig) 1969 gmc lwb (rainy day project) 1968 chevy lwb c10 250 I6 3 spd (soon to be swb) |
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09-19-2006, 12:26 AM
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#3 |
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Registered User
Join Date: Sep 2000
Location: Gold Bar, WA
Posts: 1,216
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Re: Transmission Questions
You will have to change the input gear to your transfer case. The t-cases that were behind th-350's and 700R4's have a 27 spline input and the t-cases behind th-400 & SM-465 have a 32 spline input. I'm not 100% sure, but you may also need a different trnasfer case adapter too.
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My Projects: 1960 GMC 1/2ton with 305 V6 (daily driver) 1963 Chevy 1/2ton 2wd...converting to 4x4 1967 Suburban 1/2ton 2wd My Girlfriends Projects 1985 Chevy Suburban 3/4ton 4x4 with 6.2L diesel, 4" lift, converted to TH-400, Warn Premium manual hubs, & Wildcat 315/75/R16 tires. (daily driver) 1978 Camaro Type LT with a Marine 350 & vortec heads, Rochester Carb, & roller cam 1978 Camaro Z28 |
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09-19-2006, 05:57 PM
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#4 |
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Registered User
Join Date: Nov 2005
Location: Kansas
Posts: 3
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Re: Transmission Questions
Thanks for info guys. I really need to find a half ton equiped with a 700r4 and do some investigating. I don't really want to spend a fortune because my suburban is rusty. The trans. does have to come out and while it was out I thought I would upgrade. I really like this body style and don't really want to buy anything else at the moment. I might be better off finding a less rusty half ton with the 700r4 already in it.
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