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Old 11-19-2003, 02:10 PM   #1
crackajacka
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set these guys straight on a th350c plz

im tryin to get help and everyone thinks a a complete idiot or something along those lines. http://67-72chevytrucks.com/vboard/s...223#post603223
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Old 11-19-2003, 04:21 PM   #2
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Did that help?

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Old 11-19-2003, 05:20 PM   #3
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a little im still trying to find a diagram of how the wireing is, i mean hell i even bought a book over the d**n trans and it doesnt say crap bout it cept it locks up. but otherwise yes it helped clear that up lol. but yea mine originaly came with the th350c on it, i got the heavy duty package originally on my truck also.
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Old 11-19-2003, 06:42 PM   #4
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What kind of truck and what year?

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Old 11-19-2003, 06:56 PM   #5
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1986 gmc 1500 sierra classic(4x2), originally had 305/th350c in it replaced the 305 with a 350
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Old 11-19-2003, 07:37 PM   #6
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I'll ask around and see if anyone has a factory repair manual for an '86. It's pretty new for my gang, though.

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Old 11-19-2003, 08:02 PM   #7
swervin ervin
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You should still have the brake cancel switch above the brake pedal. The 12 volt wire went though this switch to the low vac switch on the firewall beside the brake booster, then to the tranny. This is basically it, but more than likely there is a ton of other crap related to the lockup, such as the EGR bleed solenoid. There is no computer involved in the lock up. Didn't have one.

Now after saying this, after you get it working, you'll probably unhook it again. I know when these things first come out, they were real irritating. It's like you could feel it locking and unlocking all the time while driving. This is why everyone unhooked them in the first place.
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Old 11-19-2003, 08:25 PM   #8
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well b&m has a torque coverter lockup control for the th350c so would that work?
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Old 11-19-2003, 09:01 PM   #9
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yes it would, but Mike is right, you'll probably end up disconnecting it anyways. i did with mine, and that trans has 80,000 miles on it since i had it rebuilt.
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Old 11-19-2003, 09:02 PM   #10
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Quote:
Originally posted by swervin ervin
Now after saying this, after you get it working, you'll probably unhook it again.
That is almost a definite. you only drop about 200-400 rpms from what I remember, that is why we toggled it. It was irritating when it was hooked up and deciding on it own. We fixed it though, Through a built BBC in front of it.
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Old 11-19-2003, 09:26 PM   #11
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ok would it do anygood to drop those 200-400 rpms?
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Old 11-19-2003, 09:59 PM   #12
swervin ervin
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I never could figure out the point of it. I think it was GM's feeble way of trying to get better mileage or something. With the converter locked, the tranny is like a manual in a way. It has a direct drive function, with no slippage like a normal TH350 has.

From all the vehicles I've drove with TH350C's, I would leave it unhooked. If you are like me, it will drive you nuts. Sort of feels like it is surging and not running quite right or something.
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