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Discussion Starter #1
Hey to all,
I'm building a 1971 chevy c10. I bought the truck in really good running conditions, but definitely needs plenty of body work. The other day I noticed a pretty substantial oil slick under the truck. I thought the engine had a pretty good leak. Finally getting the chance to check it found that the transmission was at fault. It seems like it's leaking from the rear seal. I'm looking into either a rebuild or a new one. How do I find out what tranny is installed in this truck. The previous owner told me that the tranny and engine (350) are original. But I can't find anywhere where it tells me what trannies where installed in these trucks. Some info would be greatly appreciated. Thanks in advance. By the way it's an automatic.
 

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Hey to all,
I'm building a 1971 chevy c10. I bought the truck in really good running conditions, but definitely needs plenty of body work. The other day I noticed a pretty substantial oil slick under the truck. I thought the engine had a pretty good leak. Finally getting the chance to check it found that the transmission was at fault. It seems like it's leaking from the rear seal. I'm looking into either a rebuild or a new one. How do I find out what tranny is installed in this truck. The previous owner told me that the tranny and engine (350) are original. But I can't find anywhere where it tells me what trannies where installed in these trucks. Some info would be greatly appreciated. Thanks in advance. By the way it's an automatic.
gm-transmission-pan-identification-jpg.56520 Try this link..
 

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Hey to all,
I'm building a 1971 chevy c10. I bought the truck in really good running conditions, but definitely needs plenty of body work. The other day I noticed a pretty substantial oil slick under the truck. I thought the engine had a pretty good leak. Finally getting the chance to check it found that the transmission was at fault. It seems like it's leaking from the rear seal. I'm looking into either a rebuild or a new one. How do I find out what tranny is installed in this truck. The previous owner told me that the tranny and engine (350) are original. But I can't find anywhere where it tells me what trannies where installed in these trucks. Some info would be greatly appreciated. Thanks in advance. By the way it's an automatic.
Hmmm - my 69 still has the original tranny, it's a TH400. Thought that was the default for this generation.
 

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Hey to all,
I'm building a 1971 chevy c10. I bought the truck in really good running conditions, but definitely needs plenty of body work. The other day I noticed a pretty substantial oil slick under the truck. I thought the engine had a pretty good leak. Finally getting the chance to check it found that the transmission was at fault. It seems like it's leaking from the rear seal. I'm looking into either a rebuild or a new one. How do I find out what tranny is installed in this truck. The previous owner told me that the tranny and engine (350) are original. But I can't find anywhere where it tells me what trannies where installed in these trucks. Some info would be greatly appreciated. Thanks in advance. By the way it's an automatic.
TH400 was usually a 3/4 ton or HD option. For 1971 C10 the standard V8 engine and trans was a was the a 350 CI/ TH350.
Personally I would go with a 700R4 , not alot involved to adapt to a SBC. I did the swap on my 63 which has a 66 327 in it, makes a awesome freeway cruiser. has 4th gear overdrive, I go down the freeway running 70 at 2200 RPM
 

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Discussion Starter #7
TH400 was usually a 3/4 ton or HD option. For 1971 C10 the standard V8 engine and trans was a was the a 350 CI/ TH350.
Does it make a difference if it's a cheyenne or not? This truck is a cheyenne model, and I know that there's differences in it.
 

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700R4 is a good swap but personally I would go with a 200R4 as they have better gear ratios.I just don't care for the wide 1-2 gearing of the 700,but they do offer a close ratio planet set for the 700,a bit pricey though
 
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