07-01-2007, 12:08 AM | #1 |
Texas Big Wig
Join Date: Jan 2007
Location: Mineola, Texas
Posts: 5,620
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Need info ASAP !!!
Ok guys,
I have a turbo 400 in my truck & it has started to shift late, so I assume that it is the vacuum mod. I need to know what it takes to adjust the mod. Tools / what to do Thanks, Matt |
07-01-2007, 01:11 AM | #2 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
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Re: Need info ASAP !!!
itty bitty screwdriver.
Remove the vac line, stick screwdriver in, and turn counter clockwise if i remember right. before that, inspect all the hose to the mod for cracks and rips or pinces. |
07-01-2007, 01:53 AM | #4 |
KEEP ON TRUCKIN'
Join Date: Jun 2005
Location: Sterling, Va.
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Re: Need info ASAP !!!
Flat Head. They don't cost much and are simple to change.
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07-01-2007, 05:13 AM | #5 |
blood type; Retumbo
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Re: Need info ASAP !!!
did the engine mysteriously start smoking lately? may be a bad diaphram in the vac. modulator.
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07-01-2007, 08:09 AM | #6 |
Registered User
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Re: Need info ASAP !!!
I don't think most stock modulators are adjustable, but 1st, make sure the vacuum line's in good shape. No sense fiddling/replacing the modulator if it's a bad vacuum line. Also, put a vacuum gauge on the intake and make sure you've got decent manifold vacuum. If it's very low it'll affect shifting too.
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07-01-2007, 08:56 AM | #7 |
Msgt USAF Ret
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Re: Need info ASAP !!!
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07-01-2007, 10:04 AM | #8 | |
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Re: Need info ASAP !!!
Quote:
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07-01-2007, 01:08 PM | #9 |
Registered User
Join Date: Apr 2004
Location: The Other Maine!
Posts: 2,236
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Re: Need info ASAP !!!
All the 400 turbo's I have seen are all adjustable. As the longhorn dude sugg.
Very easy to fix. I adj. mine to shift into 3rd at 30 MPH with a 500 Caddy engine. I also ran a toggle swith to the electrical hook-up to shut power off when I wanted a delayed shifting point. With no power to the tranny, it will shift much later at a higher rpm and MPH. Much like a economy mode and a rip your head off balls to the walls mode. |
07-01-2007, 01:30 PM | #10 |
It's the air up here
Join Date: Mar 2007
Location: Western Colorado
Posts: 710
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Re: Need info ASAP !!!
If my younger days are remebered correctly, you can adjust the 400 to shift at about 6000 rpm if you want out of first gear. Alot of fun when your young, dumb and full of huyee!! The point being that the modulator is very adjustable. Check those vacuum lines first!!! Seen a lot of problems solved by replacing them even when they look good. A vacuum leak will cause the tranny to shift late.
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07-01-2007, 03:40 PM | #12 | |
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Re: Need info ASAP !!!
Quote:
If you want full huyee, ( I never heard that term before so thanks for that! ) And gas milage the toggle really works great! Just remember to have in the right position for the type of driving you really want to do. Hasn't anyone else done this??? |
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07-01-2007, 10:27 PM | #13 |
Texas Big Wig
Join Date: Jan 2007
Location: Mineola, Texas
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Re: Need info ASAP !!!
My kick-down switch is just a push button, funny when somebody rides with & I press it they think I have NOS... lol
I trouble shot it & it was the mod. So I'm glad it was something simple |
07-01-2007, 11:31 PM | #14 |
Designated A-hole!
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Re: Need info ASAP !!!
Glad to hear it was easily fixed.
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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" |
07-02-2007, 06:23 AM | #15 |
Special Order
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Re: Need info ASAP !!!
I learned goog info here.I never liked the low 1st in a TH400 and prefered to build TH 350s for that reason.At least in a sporty truck.I appreciate the extra beef in a HD truck.
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07-02-2007, 09:07 AM | #16 |
On the fast track to nowhere..
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Re: Need info ASAP !!!
Glad you got her fixed, I'd hate to have to tow ya to the meet
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07-02-2007, 11:31 AM | #17 |
Texas Big Wig
Join Date: Jan 2007
Location: Mineola, Texas
Posts: 5,620
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Re: Need info ASAP !!!
Well at least I'd be ride'n with somebody cool... lol
Well it's raining cows outside, so it'll be really fun getting up to the shop in my truck (road goes from thin gravel to dirt) I think today I'm gonna try and fix my oil leak, but if not then I have a whole list of stuff to fix... lol |
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