Right Stuff pre-bent th350 transmission vacuum line help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Fakeshemp73 · 01-12-2017, 08:39 PM

Hello all

I'm trying to figure out the correct routing for this Pre-bent transmission vacuum line and every way I try doesn't seem correct. I've triple checked to verify its the correct one for my application and I know I need to add a small rubber piece at the engine but the bending just doesn't line up from the modulator to the engine that I can find.

Shouldn't the line hook up at the modulator and run nice and tight up to the engine where I would then hook up a small piece of hose between the hard line and intake?

If anyone has used these pre-bend lines and has a picture how it goes I would appreciate it.

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**Joesjunk** · 01-12-2017, 10:38 PM

I put a new one of those on a friends truck I built last year, it didn't come close to fitting at all. I ended up having to bend it up to make it fit.

**leddzepp** · 01-12-2017, 10:42 PM

I have never had any pre bent line of any sort come even close to fitting. Fuel lines, brake lines, transmission cooler lines, doesn't matter, they all need to be tweaked or bent again.

Fakeshemp73 · 01-12-2017, 10:56 PM

Thanks guys, I had good luck with my pre-bent brake lines and didn't have to do hardly any reworking to them. Any tricks on bending stainless steel by hand without messing it up? from the looks of it I will need to do some serous reconfiguration of that line.

**Boog** · 01-13-2017, 06:05 AM

There is no nice way of putting it. If that is the right part number for your trans then they totally blew it. I wouldn't stand for it. You paid good money for it and deserve it to fit as designed, not to have to reengineer it too.

yuccales · 01-13-2017, 08:36 AM

Agree with Boog. That's a bummer with such a nice build you have there. The end of your new tube with the tag on it looks like it has the right bend for the vac mod. The stock one on mine has the same bend and a short piece of vac tubing. The tubing & mod darn near plug into each other. Wish I had more help for you.

James the III · 01-13-2017, 08:41 AM

That line looks like it is for a th400 not a th350..
the th400 the modulator valve comes out the side not the back ..

Fakeshemp73 · 01-13-2017, 10:05 AM

After going back out to the garage last night and messing with it for a few minutes I came to the same conclusion as Boog and packed it back up. I will send it back and try and go with a different company and see if I have better luck or I might just call them up today and see what they have to say about it.

Thanks for the help and comments...

Bigdav160 · 01-13-2017, 10:26 AM

Here's the one that came out of my truck for reference

Fakeshemp73 · 01-13-2017, 10:54 AM

Thanks for the picture. That helps.

dfwright · 01-13-2017, 11:07 AM

Here's a shot of how mine was routed before I took it apart.

**Ironangel** · 01-13-2017, 04:52 PM

I think you have it installed upside down?

01-12-2017, 08:39 PM	#1
Fakeshemp73 Registered User Join Date: Jul 2014 Location: Queen Creek AZ Posts: 37	Right Stuff pre-bent th350 transmission vacuum line help Hello all I'm trying to figure out the correct routing for this Pre-bent transmission vacuum line and every way I try doesn't seem correct. I've triple checked to verify its the correct one for my application and I know I need to add a small rubber piece at the engine but the bending just doesn't line up from the modulator to the engine that I can find. Shouldn't the line hook up at the modulator and run nice and tight up to the engine where I would then hook up a small piece of hose between the hard line and intake? If anyone has used these pre-bend lines and has a picture how it goes I would appreciate it. __________________ 1970 C10 4.5/6 drop from ECE Body off restomod that seems to be never ending. Mama Tried...

01-12-2017, 10:38 PM	#2
Joesjunk Senior Member Join Date: May 2001 Location: Independence MO. Posts: 7,705	Re: Right Stuff pre-bent th350 transmission vacuum line help I put a new one of those on a friends truck I built last year, it didn't come close to fitting at all. I ended up having to bend it up to make it fit. __________________ 72 3/4t Custom Deluxe 402/auto 66k Original paint 71 3/4t 4x4 Custom Deluxe 10k original miles Original paint 71 3/4t Cheyenne 402 70k original paint 72 3/4t 4x4 Custom deluxe 72 3/4t 4x4 Custom deluxe 91k original paint 72 Cheyenne/30 Dually 69 Camaro SS396 4-speed 13 GMC 2500HD Duramax I bought new 05 Jeep Wrangler "Willys Edition" 12k miles (I bought new) 85 3/4 ton 4x4 Scottsdale 33k miles original paint 86 1 ton 4x4 SRW Silverado 454 restored 80 1 ton 4x4 SRW Silverado 9,434 original miles!! original paint 95 GMC 1 ton dually 4x4 my dad bought new 95 GMC 3/4 ton 4x4, regular cab 454, 31k original miles 2002 2500HD 4x4 regular cab 6.0L 67k miles 2002 2500HD 4x4 regular cab 8.1L 28k miles 2003 GMC 2500HD 4x4 regular cab Diesel 93k miles 67-72 Parts for sale

01-12-2017, 10:42 PM	#3
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 20,031	Re: Right Stuff pre-bent th350 transmission vacuum line help I have never had any pre bent line of any sort come even close to fitting. Fuel lines, brake lines, transmission cooler lines, doesn't matter, they all need to be tweaked or bent again. __________________ 1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man RIP FleetsidePaul

01-12-2017, 10:56 PM	#4
Fakeshemp73 Registered User Join Date: Jul 2014 Location: Queen Creek AZ Posts: 37	Re: Right Stuff pre-bent th350 transmission vacuum line help Thanks guys, I had good luck with my pre-bent brake lines and didn't have to do hardly any reworking to them. Any tricks on bending stainless steel by hand without messing it up? from the looks of it I will need to do some serous reconfiguration of that line. __________________ 1970 C10 4.5/6 drop from ECE Body off restomod that seems to be never ending. Mama Tried...

01-13-2017, 06:05 AM	#5
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,514	Re: Right Stuff pre-bent th350 transmission vacuum line help There is no nice way of putting it. If that is the right part number for your trans then they totally blew it. I wouldn't stand for it. You paid good money for it and deserve it to fit as designed, not to have to reengineer it too. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

01-13-2017, 08:36 AM	#6
yuccales Registered User Join Date: May 2011 Location: Northern Calif. Posts: 3,771	Re: Right Stuff pre-bent th350 transmission vacuum line help Agree with Boog. That's a bummer with such a nice build you have there. The end of your new tube with the tag on it looks like it has the right bend for the vac mod. The stock one on mine has the same bend and a short piece of vac tubing. The tubing & mod darn near plug into each other. Wish I had more help for you.

01-13-2017, 08:41 AM	#7
James the III Registered User Join Date: Nov 2016 Location: lowell ma Posts: 750	Re: Right Stuff pre-bent th350 transmission vacuum line help That line looks like it is for a th400 not a th350.. the th400 the modulator valve comes out the side not the back ..

01-13-2017, 10:05 AM	#8
Fakeshemp73 Registered User Join Date: Jul 2014 Location: Queen Creek AZ Posts: 37	Re: Right Stuff pre-bent th350 transmission vacuum line help After going back out to the garage last night and messing with it for a few minutes I came to the same conclusion as Boog and packed it back up. I will send it back and try and go with a different company and see if I have better luck or I might just call them up today and see what they have to say about it. Thanks for the help and comments... __________________ 1970 C10 4.5/6 drop from ECE Body off restomod that seems to be never ending. Mama Tried...

01-13-2017, 10:26 AM	#9
Bigdav160 Registered User Join Date: Apr 2011 Location: Klein Texas Posts: 3,852	Re: Right Stuff pre-bent th350 transmission vacuum line help Here's the one that came out of my truck for reference __________________ My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe

01-13-2017, 10:54 AM	#10
Fakeshemp73 Registered User Join Date: Jul 2014 Location: Queen Creek AZ Posts: 37	Re: Right Stuff pre-bent th350 transmission vacuum line help Thanks for the picture. That helps. __________________ 1970 C10 4.5/6 drop from ECE Body off restomod that seems to be never ending. Mama Tried...

01-13-2017, 11:07 AM	#11
dfwright Registered User Join Date: Jan 2009 Location: San Antonio, Texas Posts: 1,374	Re: Right Stuff pre-bent th350 transmission vacuum line help Here's a shot of how mine was routed before I took it apart. Attached Images __________________ 1972 C10 LWB, 350/350 Deconstruction began 5/2009, mostly completed restoration, 5/2017

01-13-2017, 04:52 PM	#12
Ironangel Senior Member Join Date: Feb 2010 Location: Falls City, Nebraska "100 Miles From Nowhere" Posts: 2,219	Re: Right Stuff pre-bent th350 transmission vacuum line help I think you have it installed upside down? __________________ Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American"



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