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Old 07-13-2007, 11:18 AM
Im trying to have an idea!
 
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700r4 or is it

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Well Im in the process of installing this trans in my truck. I came across this little bugger (see attached pic), I had no clue what it does. Went thru my caprice manual, it does not show. Then I noticed that the pics in my manual are a bit different from what my trans looks.

Am I mistaken this trans for a 700r4? the closest trans that it looks like is a 250c! What is a 250c? I have never heard of this kinda trans, but my book has one called out in 84 (the trans i have is from an 85 caprice with OD).

What is that little electrical connection for???
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Old 07-13-2007, 12:06 PM
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Don't take this as fact, but to me it looks like a TH350C trans. It has a modulator so it's not a 700R4. The angled corner on the pan the the 2-3 accumulator cover and pressure tap look just like the TH350. Add the plug to all of that and my GUESS is the lock-up version of the TH350.

Mark
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Old 07-13-2007, 12:18 PM
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700r4

This is a THM350. The switch you can see is not for lockup, but as far as I can remember was tied into a/c or vacuum advance[for timing].

This switch was famous for leaking, so if you use this trans remove the switch and install an 1/8 inch pipe tap plug.
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Old 07-13-2007, 01:05 PM
Im trying to have an idea!
 
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Quote:
Originally Posted by Jmark
Don't take this as fact, but to me it looks like a TH350C trans. It has a modulator so it's not a 700R4. The angled corner on the pan the the 2-3 accumulator cover and pressure tap look just like the TH350. Add the plug to all of that and my GUESS is the lock-up version of the TH350.

Mark
I pulled this trans and motor from a 4sp caprice...I still have the 1985 caprice.
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Old 07-13-2007, 01:15 PM
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I think the 350c would have the computer plug on the linkage side?

I talked with a friend recently who used to build custom use automatics. I asked him if a 350c could be set up to lock & unlock without a hand switch or computer. First, he said why?, then, why not a 700r4? So I explained I already went to a 2.76 rear and on the highway I just need a little extra drop in rpm. (plus I never liked the wicked low 1st gear in the 700)

He said it could be done, but I don't recall what he said about the mods. Sounded easy though.

I didn't want a manual switch.

IMO, the 350c would work slick in certain vehicles with the right gear & motor.
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Old 07-13-2007, 02:38 PM
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Quote:
Originally Posted by briscoe
This is a THM350. The switch you can see is not for lockup, but as far as I can remember was tied into a/c or vacuum advance[for timing].

This switch was famous for leaking, so if you use this trans remove the switch and install an 1/8 inch pipe tap plug.
And the words from the experts are always welcome! LOL Glad I qualified my reply with "Guess" and "don't take this as fact"!
But I was atleast close!

Mark
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