is this y my trans doesnt shift right - The 1947 - Present Chevrolet & GMC Truck Message Board Network

crackajacka · 10-19-2003, 08:21 PM

ok ive been looking at stuff to remove cause im bored and certain things were stressing me out so i went and started on the project. but is this why there is hardly any vaccum. it shifts into 3rd anywhere from 20 when its cold to 30 even when its warmed up and i floor it? any recomendations as to what i do?

bpmcgee · 10-19-2003, 08:35 PM

Not sure if it's why your tranny is shifting too fast. I know on my TH350, it wouldn't shift OUT of first when the hose wasn't hooked up.

By all means, though, fix that. It can't be doing your carb any good.

Brian

crackajacka · 10-19-2003, 09:31 PM

it shifted just fine before the engine swap, and the guy put that in there the 2 vaccum lines that run off it goto the a/c that im ripping out btw lol

NoLegs · 10-20-2003, 07:03 PM

Is it even screwed into the manifold? Looks like it's just sitting on there to me.

86SILVERADO · 10-20-2003, 07:13 PM

The line to your vacuum modulator should be plumbed into the manifold. It sounds like the hose was routed incorrectly when the engine was replaced and you have no vacuum to the tranny anymore.

76HighSierra · 10-20-2003, 08:13 PM

Quote:

Originally posted by NoLegs
Is it even screwed into the manifold? Looks like it's just sitting on there to me.

To me, it looks horribly cross-threaded. When you have someone behind the wrenches who's a bit "ham handed"

it can happen...especially in alluminum. Get the vacuum tee fixed and reconnect the modulator valve line.

phantom dually · 10-20-2003, 09:17 PM

If the threads are stripped you will have to retapp it. I would not do it on the truck as scraps of metal may get into the intake.

MylilBowTie · 10-20-2003, 10:34 PM

The rubber hose for the modulator valve looks pinched in half and not getting any vacuum. If the threads are stripped I would let the person that installed the engine know about it. Hopefully its not stripped and will thread like its supposed to and fix the problem.

If you rethread it its going to be like 30.00 to fix it. Thats for the drill bit size, heil coils, tap, installer. If you have to pull the intake you will need those gaskets a distributor wrench and a timing light. Compressed air would be nice but a shop vac will work and if nothing else rinse it out a couple of times with water.

ps: Take a wire brush or wire wheel to the vacuum adaptor threads to clean all the crud out of the treads. Make sure to use some type of lightweight oil or wd-40 when you tap the threads if need be.

10-19-2003, 08:21 PM	#1
crackajacka Stylin Join Date: Sep 2001 Location: Tuttle, OK Posts: 620	is this y my trans doesnt shift right ok ive been looking at stuff to remove cause im bored and certain things were stressing me out so i went and started on the project. but is this why there is hardly any vaccum. it shifts into 3rd anywhere from 20 when its cold to 30 even when its warmed up and i floor it? any recomendations as to what i do? Attached Images __________________ 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/

10-19-2003, 09:31 PM	#3
crackajacka Stylin Join Date: Sep 2001 Location: Tuttle, OK Posts: 620	it shifted just fine before the engine swap, and the guy put that in there the 2 vaccum lines that run off it goto the a/c that im ripping out btw lol __________________ 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/

10-20-2003, 07:13 PM	#5
86SILVERADO Registered User Join Date: Dec 2002 Location: Hills of Western Mass Posts: 626	The line to your vacuum modulator should be plumbed into the manifold. It sounds like the hose was routed incorrectly when the engine was replaced and you have no vacuum to the tranny anymore. __________________ 86 Silverado C10 back to 305 power! 67 C30 Dually Dump, with 350 transplant, Rockhauler 05 Duramax 3500 "If at first you don't succeed, try a bigger hammer" Member of the 1-Ton club!

10-20-2003, 09:17 PM	#7
phantom dually Project92 SWB stepside Join Date: Feb 2003 Location: Louisville KY Posts: 4,792	If the threads are stripped you will have to retapp it. I would not do it on the truck as scraps of metal may get into the intake. __________________ 92 C1500 stepside 496 Stroker Competiton Engineering Ladder bars/QA1 coilovers. Dana 60 rear with 4.10 gear and posi. Bonspeed Palisade 20x12 in rear w/335/30/20 and 20x8.5 front w/245/40/20. 5/8 drop with Belltech springs/DJM spindles/drop shocks. WWS Progress thread http://67-72chevytrucks.com/vboard/s...d.php?t=140448

10-20-2003, 10:34 PM	#8
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	The rubber hose for the modulator valve looks pinched in half and not getting any vacuum. If the threads are stripped I would let the person that installed the engine know about it. Hopefully its not stripped and will thread like its supposed to and fix the problem. If you rethread it its going to be like 30.00 to fix it. Thats for the drill bit size, heil coils, tap, installer. If you have to pull the intake you will need those gaskets a distributor wrench and a timing light. Compressed air would be nice but a shop vac will work and if nothing else rinse it out a couple of times with water. ps: Take a wire brush or wire wheel to the vacuum adaptor threads to clean all the crud out of the treads. Make sure to use some type of lightweight oil or wd-40 when you tap the threads if need be. Last edited by MylilBowTie; 10-20-2003 at 10:39 PM.

10-19-2003, 08:35 PM	#2
bpmcgee Registered User Join Date: Mar 2003 Location: Northern Illinois Posts: 2,181	Not sure if it's why your tranny is shifting too fast. I know on my TH350, it wouldn't shift OUT of first when the hose wasn't hooked up. By all means, though, fix that. It can't be doing your carb any good. Brian

10-20-2003, 07:03 PM	#4
NoLegs Registered User Join Date: Oct 2003 Location: Rapid City, SD Posts: 14	Is it even screwed into the manifold? Looks like it's just sitting on there to me.



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.