set these guys straight on a th350c plz - The 1947 - Present Chevrolet & GMC Truck Message Board Network

crackajacka · 11-19-2003, 02:10 PM

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

bpmcgee · 11-19-2003, 04:21 PM

Did that help?

Brian

crackajacka · 11-19-2003, 05:20 PM

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.

bpmcgee · 11-19-2003, 06:42 PM

What kind of truck and what year?

Brian

crackajacka · 11-19-2003, 06:56 PM

1986 gmc 1500 sierra classic(4x2), originally had 305/th350c in it replaced the 305 with a 350

bpmcgee · 11-19-2003, 07:37 PM

I'll ask around and see if anyone has a factory repair manual for an '86. It's pretty new for my gang, though.

Brian

**swervin ervin** · 11-19-2003, 08:02 PM

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.

crackajacka · 11-19-2003, 08:25 PM

well b&m has a torque coverter lockup control for the th350c so would that work?

*1FaastC10* · 11-19-2003, 09:01 PM

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.

**Captkaos** · 11-19-2003, 09:02 PM

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.

crackajacka · 11-19-2003, 09:26 PM

ok would it do anygood to drop those 200-400 rpms?

**swervin ervin** · 11-19-2003, 09:59 PM

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.

11-19-2003, 02:10 PM	#1
crackajacka Stylin Join Date: Sep 2001 Location: Tuttle, OK Posts: 620	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 __________________ Ive been traveling for some time, with my fishin pole and my bottle of shyne. Most Girls like finished products and just dont understand what a good addiction does for you http://www.paulwall.us/

11-19-2003, 05:20 PM	#3
crackajacka Stylin Join Date: Sep 2001 Location: Tuttle, OK Posts: 620	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. __________________ Ive been traveling for some time, with my fishin pole and my bottle of shyne. Most Girls like finished products and just dont understand what a good addiction does for you http://www.paulwall.us/

11-19-2003, 06:56 PM	#5
crackajacka Stylin Join Date: Sep 2001 Location: Tuttle, OK Posts: 620	1986 gmc 1500 sierra classic(4x2), originally had 305/th350c in it replaced the 305 with a 350 __________________ Ive been traveling for some time, with my fishin pole and my bottle of shyne. Most Girls like finished products and just dont understand what a good addiction does for you http://www.paulwall.us/

11-19-2003, 08:02 PM	#7
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	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. __________________ Mike 1985 Chevy C-10

11-19-2003, 08:25 PM	#8
crackajacka Stylin Join Date: Sep 2001 Location: Tuttle, OK Posts: 620	well b&m has a torque coverter lockup control for the th350c so would that work? __________________ Ive been traveling for some time, with my fishin pole and my bottle of shyne. Most Girls like finished products and just dont understand what a good addiction does for you http://www.paulwall.us/

11-19-2003, 04:21 PM	#2
bpmcgee Registered User Join Date: Mar 2003 Location: Northern Illinois Posts: 2,181	Did that help? Brian

11-19-2003, 06:42 PM	#4
bpmcgee Registered User Join Date: Mar 2003 Location: Northern Illinois Posts: 2,181	What kind of truck and what year? Brian

11-19-2003, 07:37 PM	#6
bpmcgee Registered User Join Date: Mar 2003 Location: Northern Illinois Posts: 2,181	I'll ask around and see if anyone has a factory repair manual for an '86. It's pretty new for my gang, though. Brian

11-19-2003, 09:01 PM	#9
1FaastC10 Account Suspended Join Date: Oct 2002 Location: Elkhart, IN Posts: 6,399	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.

11-19-2003, 09:26 PM	#11
crackajacka Stylin Join Date: Sep 2001 Location: Tuttle, OK Posts: 620	ok would it do anygood to drop those 200-400 rpms? __________________ Ive been traveling for some time, with my fishin pole and my bottle of shyne. Most Girls like finished products and just dont understand what a good addiction does for you http://www.paulwall.us/

11-19-2003, 09:59 PM	#12
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	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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