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#1 |
Registered User
Join Date: Mar 2006
Location: Norman, Oklahoma
Posts: 553
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Factory Transmission?
What did a factory 87 swb 4.3 liter tbi v6 come with for a tranny? i know some where standard and some were automatics... but mine was swapped from a 4.3 to a 305 tbi and i noticed i have a th400 transmission... did they come with these or was this added when they put in the 305 motor? arent th400s stronger than th350s??
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1973 Chevrolet C20 (Under Construction) |
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#2 |
Registered User
Join Date: Feb 2007
Location: Austin, TX
Posts: 3,930
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Re: Factory Transmission?
A 4.3 would most likely have come with a Turbo 350 or a 700R4. Same for the 305. Turbo 400's usually came with big blocks.
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#3 |
Right turn Clyde
Join Date: Nov 2002
Location: Cincinnati, Ohio
Posts: 2,911
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Re: Factory Transmission?
87 Was the odd year that I've seen alot of th375s. It looks like a th400 but it has a longer tailshaft and smaller size output shaft of a th350/700r4. I've got two of them one was a 5.0 and the other 4.3. Some also have HD cast into the bellhousing. Not to be confused for a th475 with strait cut planetary gears.
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1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI |
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#4 |
Registered User
Join Date: Mar 2006
Location: Norman, Oklahoma
Posts: 553
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Re: Factory Transmission?
so it could be a turbo 375? it has the same pan style?
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1973 Chevrolet C20 (Under Construction) |
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#5 |
Right turn Clyde
Join Date: Nov 2002
Location: Cincinnati, Ohio
Posts: 2,911
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Re: Factory Transmission?
Same pan style as a th400 or th350? Where is the modulator valve located on it? Is it on the passenger side or on the rear by the tailshaft housing?
If you could post a picture of it that would be alot easier to id (not absolutely necessary though).
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1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI |
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#6 |
Registered User
Join Date: Mar 2006
Location: Norman, Oklahoma
Posts: 553
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Re: Factory Transmission?
th400 style pan
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1973 Chevrolet C20 (Under Construction) |
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#7 |
Registered User
Join Date: Feb 2004
Location: northern, in
Posts: 350
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Re: Factory Transmission?
the TH350 was killed off in 86, so no chance of a TH350 (actually a TH350C after 81). i've seen 700s behind 4.3s, as well as the TH375 and the TH400.
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#8 |
Right turn Clyde
Join Date: Nov 2002
Location: Cincinnati, Ohio
Posts: 2,911
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Re: Factory Transmission?
The th350c was made after 81, my 84 had one. The book I have covers the th350c from 1979-1984. I'm sure a few more have went out the door after 84 also. Though the greater major started shifting to the 700r4 by then.
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1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI |
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#9 |
Registered User
Join Date: Mar 2006
Location: Norman, Oklahoma
Posts: 553
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Re: Factory Transmission?
so th375 and th400 have the same style pan?? are they stronger than a th350?
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1973 Chevrolet C20 (Under Construction) |
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#10 |
Right turn Clyde
Join Date: Nov 2002
Location: Cincinnati, Ohio
Posts: 2,911
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Re: Factory Transmission?
The pans are the same but a few parts are different. Yes it is rated higher and can hold more power than th350. Its like how they "detune" engines in a way. They are still pretty good but don't have the heavier duty parts that the short tail th400s have.
There should be an id tag on your transmission. Should be on the passenger side. Look for a sheet metal tag that has Letters and numbers. If you can get those I can lookup the id for it.
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1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI |
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#11 |
Registered User
Join Date: Oct 2006
Location: iowa
Posts: 722
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Re: Factory Transmission?
i bought an '87 350 tbi truck last summer that has a 400th in it...thought it was kinda odd to see it in that new of a truck...but it is a true 400th
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"Horsepower is how fast you hit the wall, torque is how far you carry the wall with you." '84 chevy half ton short box 2wd, 67,000 actual miles ![]() '03 chevy 1500 HD crew cab 4x4 standard box, 6.0L ![]() ![]() ![]() |
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#12 |
Registered User
Join Date: Feb 2004
Location: northern, in
Posts: 350
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Re: Factory Transmission?
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