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01-27-2005, 08:48 PM | #1 |
Not too old to learn
Join Date: Mar 2004
Location: SoCal
Posts: 617
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Need help with tranny education
I crawled under my truck today and dicovered a tube sticking out of bell housing on top passenger side.
Nothing hooked to it. Looks like a vacum hose should be connede as there is a loose one hanging down net to the tube. What is it?????? The trans is a 350turbo tha engine is a 350 bilt in mid 1970. I attached two pictures to help see what I asking. Also I read you guys talking about TV throttle valve connection from carb. Mine has nothing other than the shift linkage. What is missing??
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1968 C10 a way to long restoration. |
01-27-2005, 09:17 PM | #2 |
68cst_ss490
Join Date: May 2001
Location: edmonton,canada
Posts: 1,363
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Its just a vent hole. you can put a short piece of rubber hose on it to let it hang down slightly farther. I think its 5/16 hose will work
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Dean edmonton,canada a winter wonderland 2005 Chevrolet Avalanche LT cold air intake, performance exhaust, Comp cams cam, jba shorty ceramic headers. http://www.cardomain.com/ride/3090973 |
01-27-2005, 09:27 PM | #3 |
"Ochre Ogre"
Join Date: Apr 2000
Location: Springfield, MN
Posts: 3,558
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I think you have a TH400 there. The vacuum modulator on a th350 is at the back of the trans.
And that is just a vent. You don't need to worry about it. It doesn't make a mess or cause any problems unless you over fill the trans. Further identification is to look at the tranny pan. If it looks like the state of Illinois it is a th400. If it is a square with one corner clipped you have a th350.
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Bowtie Truck Stop Inc. Mid-West GM Truck Restoration Parts Supplier Your Key Parts, Auto Metal Direct, Dynacorn, and Goodmark dealer. like us @ www.facebook.com/BowtieTruckStop 1971 C-10 Suburban (Ochre) 1971 K-10 Suburban (Ochre) 1972 C-10 Suburban (Ochre) 1972 K-20 Suburban (Yellow- that just aint right!) Springfield, Minnesota 56087 Last edited by da-burb; 01-27-2005 at 09:29 PM. |
01-27-2005, 09:37 PM | #4 | |
Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,450
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Quote:
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"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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01-27-2005, 11:43 PM | #5 |
Not too old to learn
Join Date: Mar 2004
Location: SoCal
Posts: 617
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Thanks guys, but the pan on mine is square with a corner clipped. The modulater is on the side next to dip stick tube( see pic) No cable anywere. I did notice a small hole with what looks like a threaded hole for a set screw.But the hole is about 1/2 "in diameter.
Hummmmm!!
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1968 C10 a way to long restoration. |
01-28-2005, 08:10 AM | #6 |
Watch out for your cornhole !
Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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I'm with these guys on this deal. That modulator up on the side, by the cooler lines suggests a TH400.
The TH350 modulator is further back and points towards the rear of the truck rather than straight out the right side like yours does.
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01-28-2005, 10:23 AM | #7 |
Got Light Emitting Diode?
Join Date: Apr 2004
Location: Newberg, OR
Posts: 2,485
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.........
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1968 1/2 ton 2wd lwb 6 lug disc and bags up front. Next c notch and rear bags '02 Chevy Silverado LT ext cab short bed 2WD 5/7 drop on 22's(the family car) 1993 Cherokee work ride/weekend wheeler |
01-28-2005, 01:31 PM | #8 |
Not too old to learn
Join Date: Mar 2004
Location: SoCal
Posts: 617
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Well here is proof this board really works. It got me out in the rain, yes it rains in Southern California,and looked at trans pan again.
It is a TH400.thanks 68W for the Tannyguide.Pictures are worth a thousand words. Da Burb said the pan looks like Illinois, well I was getting ready to get out the USA map, but I thought no I saw the clipped edge.........well know I know. So what next where and how should the kick down TV hook up go? I only drove this truck a little and runs fine, but did not push it untill know more.
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1968 C10 a way to long restoration. |
01-28-2005, 02:57 PM | #9 |
Registered User
Join Date: Feb 2004
Location: Tacoma WA
Posts: 1,365
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Kick down
The T400 has an electric kickdown. On the 67-70 cabs it is mounted on the carb with a pink wire from the fuse block(hot in run) and an orange wire to the trans connector on the drivers side toward the back. The switch is a plunger with a rubber boot. There is an ear that mounts on the carb throttle shaft arm that activates the kickdown when you punch it. The 71/72 models with throttle cable mount the switch in the cab by the gas petal. The wires are the same color.
The 67/70 switch and mounting bracket are quite common. The factory wires often get very brittle from heat over the engine and oily running down to the trans. The carb mounted ear is VERY hard to find. The 71/72 switch carried over to 73 and is readily available. The bracket it mounts to is hard to find. The same problems exist for the orange wire in 71/72. Hope this helps - Bob
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67 C-20 LWB, tilt, speed alert, vac, 454, T400 67 C-10 SWB, factory air with more to follow |
01-28-2005, 03:18 PM | #10 |
Not too old to learn
Join Date: Mar 2004
Location: SoCal
Posts: 617
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Bob Moore. Thanks for reply. I have read alot of articles since I found it is TH400.
My truck is a 68 with a later 350 engine and a Qjet carb, so I will be adding the kick down devices. I am assuming this trans not stock for the 68 unless the original engine was a BB. so it may not have the correct wiring. I'll let you all know how it turns out.I don't have the build sheet nor glove box door sheet so not sure what truck came with.
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1968 C10 a way to long restoration. |
01-28-2005, 06:01 PM | #11 |
Watch out for your cornhole !
Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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If you're not concerned with stockness and don't feel like scouring the world for correct parts, Lokar makes a real nice kickdown kit. It uses a cable that mounts to the carb and an electric box that connects to the transmission.
I used it on my last TH400 truck and was very pleased with the results and quality.
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