TH400 question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

don t. - 72gmc · 04-29-2002, 08:07 AM

I replaced the pan gasket, noticed an orange wire running to a plug on the dr. side of tranny. Wire was real bad looking, figure it'll replace. Pulled on wire and the whole thing pulls out from tranny, draining about 1qt. of fluid. This plug has the one wire comming in and has 2 posts going out (inside tranny). Looked into tranny, only see 1 wire.
Question....What did I do???
Thanks....don t. ....

------------------
It aint gonna be a trailer queen, its gotta work, just like me.
3/4 ton,350 w/HEI, 79 q-jet, th400, Dana 60.

**COBALT** · 04-29-2002, 03:42 PM

That's the wire that runs to your detent soleniod that's inside the pan. The soleniod is this block shaped little thing with rounded sides. It should have two connections that run to the terminal in the case. The terminal should be a plastic terminal with only one connection to the outside, where that orange lead connects to (there's more than one connection for TH400's earlier than '65).

The leads inside the case I don't know much about. I just know they run to the soleniod. Anyone else? You could try getting a book, or searching on:

www.dejanews.com

Good luck.

------------------
'69 3/4 ton C20 2wd w/ 350ci/400THM and a wood bed!
'69 3/4 ton Custom 20 2wd w/ ORIGINAL 350ci/4sp Manual and a wood bed (parts beast).
Seattle, WA.

*See pics of my trucks and project at www.webshots.com!

don t. - 72gmc · 04-29-2002, 03:49 PM

There should be 2 wires inside the trans connecting to this plug?? Only saw one but couldn't get my fat head up to close. I will look again when I get home.
Thanks...don t. ....

------------------
It aint gonna be a trailer queen, its gotta work, just like me.
3/4 ton,350 w/HEI, 79 q-jet, th400, Dana 60.

**COBALT** · 04-29-2002, 04:10 PM

Hmmm...now I'm wondering...

It's been a while since I've opened my case. I don't have my book with me either...

I can check when I get home. Maybe only one connection to the soleniod, but I assumed it needed to be grounded, so two seemed right. It might be grouned through the actual housing of the solenoid to the valve body or something, so the second pole on the terminal may not even need to be used. If that's the case then you just have to make sure the right terminal on the inside is used.

Just a thought.

------------------
'69 3/4 ton C20 2wd w/ 350ci/400THM and a wood bed!
'69 3/4 ton Custom 20 2wd w/ ORIGINAL 350ci/4sp Manual and a wood bed (parts beast).
Seattle, WA.

*See pics of my trucks and project at www.webshots.com!

*Fast68Chevy* · 04-29-2002, 06:41 PM

i owuld think it would just use ground from case/engine/chassis/body, they all tie together through bolts and cables..

but yeah orange is the electric detent, wtich wil be on carb pass side or on accelerator pedal assembly depending on year of truck

if oyu dont have a switch at all then i have one, i have whole 4 bbl rochester, switch and all for th400, very good working carb

------------------
Randy- Lincoln, IL
randy@ccaonline.com 2177353230
-71 C-10 350/CH465/3.07, assemble it, yeah right, that'll happen in this world,(not)
-84 Z28 Camaro 5.0L 700R4, 3.73, beater, paid way too much for it like an idiot,,
-84 Firebird SE 2.8L T-5, rod knocking, dammit,,
-82 Firebird 350 4bolt (TBL)/TH350, not running, dammit...
buy/sell/hoard/trade most any GM vehicle parts of any kind
-parting out: '81 Cutlass Supreme Brougham
*Paint is overrated
© RSS Enterprises 2000

[This message has been edited by Fast68Chevy (edited April 29, 2002).]

don t. - 72gmc · 04-30-2002, 03:32 AM

Never got a chance to check it out last night, gotta love unpaid overtime!..NOT!!
Hey Fast..."wil be on carb pass side or on accelerator pedal assembly depending on year of truck".....this orange wire goes to a male/female spade connector, which goes to the firewall, a round opening, near the distributor, on the dr. side. It appears to be original but the wire down by the tranny is really bad.
Whats this thing do?
Should there be 2 wires inside the tranny?? If theres only one wire, which post does it go to on the detent plug???
Maybe I'll get lucky and the boss'll let me leave early today (yea, right - oh, well).
Thanks much...don t. ....

------------------
It aint gonna be a trailer queen, its gotta work, just like me.
3/4 ton,350 w/HEI, 79 q-jet, th400, Dana 60.

[This message has been edited by don t. - 72gmc (edited April 30, 2002).]

04-29-2002, 08:07 AM	#1
don t. - 72gmc Registered User Join Date: Dec 2001 Location: harvard, il. USA Posts: 394	TH400 question I replaced the pan gasket, noticed an orange wire running to a plug on the dr. side of tranny. Wire was real bad looking, figure it'll replace. Pulled on wire and the whole thing pulls out from tranny, draining about 1qt. of fluid. This plug has the one wire comming in and has 2 posts going out (inside tranny). Looked into tranny, only see 1 wire. Question....What did I do??? Thanks....don t. .... ------------------ It aint gonna be a trailer queen, its gotta work, just like me. 3/4 ton,350 w/HEI, 79 q-jet, th400, Dana 60.

04-29-2002, 03:42 PM	#2
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	That's the wire that runs to your detent soleniod that's inside the pan. The soleniod is this block shaped little thing with rounded sides. It should have two connections that run to the terminal in the case. The terminal should be a plastic terminal with only one connection to the outside, where that orange lead connects to (there's more than one connection for TH400's earlier than '65). The leads inside the case I don't know much about. I just know they run to the soleniod. Anyone else? You could try getting a book, or searching on: www.dejanews.com Good luck. ------------------ '69 3/4 ton C20 2wd w/ 350ci/400THM and a wood bed! '69 3/4 ton Custom 20 2wd w/ ORIGINAL 350ci/4sp Manual and a wood bed (parts beast). Seattle, WA. *See pics of my trucks and project at www.webshots.com! __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

04-29-2002, 04:10 PM	#4
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	Hmmm...now I'm wondering... It's been a while since I've opened my case. I don't have my book with me either... I can check when I get home. Maybe only one connection to the soleniod, but I assumed it needed to be grounded, so two seemed right. It might be grouned through the actual housing of the solenoid to the valve body or something, so the second pole on the terminal may not even need to be used. If that's the case then you just have to make sure the right terminal on the inside is used. Just a thought. ------------------ '69 3/4 ton C20 2wd w/ 350ci/400THM and a wood bed! '69 3/4 ton Custom 20 2wd w/ ORIGINAL 350ci/4sp Manual and a wood bed (parts beast). Seattle, WA. *See pics of my trucks and project at www.webshots.com! __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

04-29-2002, 03:49 PM	#3
don t. - 72gmc Registered User Join Date: Dec 2001 Location: harvard, il. USA Posts: 394	There should be 2 wires inside the trans connecting to this plug?? Only saw one but couldn't get my fat head up to close. I will look again when I get home. Thanks...don t. .... ------------------ It aint gonna be a trailer queen, its gotta work, just like me. 3/4 ton,350 w/HEI, 79 q-jet, th400, Dana 60.

04-29-2002, 06:41 PM	#5
Fast68Chevy Account Suspended Join Date: May 2000 Location: IL Posts: 0	i owuld think it would just use ground from case/engine/chassis/body, they all tie together through bolts and cables.. but yeah orange is the electric detent, wtich wil be on carb pass side or on accelerator pedal assembly depending on year of truck if oyu dont have a switch at all then i have one, i have whole 4 bbl rochester, switch and all for th400, very good working carb ------------------ Randy- Lincoln, IL randy@ccaonline.com 2177353230 -71 C-10 350/CH465/3.07, assemble it, yeah right, that'll happen in this world,(not) -84 Z28 Camaro 5.0L 700R4, 3.73, beater, paid way too much for it like an idiot,, -84 Firebird SE 2.8L T-5, rod knocking, dammit,, -82 Firebird 350 4bolt (TBL)/TH350, not running, dammit... buy/sell/hoard/trade most any GM vehicle parts of any kind -parting out: '81 Cutlass Supreme Brougham *Paint is overrated © RSS Enterprises 2000 [This message has been edited by Fast68Chevy (edited April 29, 2002).]

04-30-2002, 03:32 AM	#6
don t. - 72gmc Registered User Join Date: Dec 2001 Location: harvard, il. USA Posts: 394	Never got a chance to check it out last night, gotta love unpaid overtime!..NOT!! Hey Fast..."wil be on carb pass side or on accelerator pedal assembly depending on year of truck".....this orange wire goes to a male/female spade connector, which goes to the firewall, a round opening, near the distributor, on the dr. side. It appears to be original but the wire down by the tranny is really bad. Whats this thing do? Should there be 2 wires inside the tranny?? If theres only one wire, which post does it go to on the detent plug??? Maybe I'll get lucky and the boss'll let me leave early today (yea, right - oh, well). Thanks much...don t. .... ------------------ It aint gonna be a trailer queen, its gotta work, just like me. 3/4 ton,350 w/HEI, 79 q-jet, th400, Dana 60. [This message has been edited by don t. - 72gmc (edited April 30, 2002).]



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