thewiz
has rocks in the head
"What good is money if you don't spend it"
Member since January 2004
Posts: 735
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Post by thewiz on Oct 30, 2006 12:59:22 GMT -5
my transmission takes a long time to shift when it is cold and it slips a little from second to third. i need to go about a mile before it starts to shift normal. any thoughts from you motor heads. i had the tranny flushed and the screen cleaned, the slipping stoped but it still has a long shift till it warms up.
thanks
the wiz
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Post by sandsman1 on Oct 30, 2006 18:51:29 GMT -5
hey wiz my camaro usta do that and my buddy took the thingy that looks like a flyin saucer with a vacum line on it off and replaced it and it never did it again hahaha=== i have no idea what its called and that was on a 76 camero now adays you need a computer to tell ya whats wrong but i remember him saying it had something to do with vacum
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Post by docone31 on Oct 30, 2006 18:51:30 GMT -5
I am a gearhead, it sounds like it is an older transmission. The seals need replacing, not adding any goop. What you will need to do, is, start the vehicle, put it in drive, and wait untill the transmission pump charges up. With the older seals, air is getting into the pump seals and the pump is running too low to actually work properly. It probably does not have the same symptoms in the afternoon after driving the car.
You will need a total rebuild sooner or later. If you really like the car, it is worth it. I would also check the modulator lines for cracked ends. A vaccum leak will also make the transmission slow to shift. If the ends are cracked, just snip them off and place them back on.
We had to do that wait for gear thing for over two years on our van. The rebuilt transmission did the trick. The seals looked like cracked paper, nothing left. Heat, and time does that to transmissions.
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Post by rhodescabbin on Oct 30, 2006 19:01:40 GMT -5
ok a re-post lol I need to do spellcheck, sorry about that...
I agree with docone, I have a 1967 Suburban, I keep meaning to send pics to earthdog. Anyway I inherited it from my Dad, and the tranny is doing that and has been for a couple years. The rpm's rev up pretty high before it shifts but once it warms up good it shifts smoothly...
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Post by docone31 on Oct 30, 2006 20:16:05 GMT -5
A 67 Burban, way cool! We have an 87 with a now 502 stroker. 635hp. It is still breaking in, and we are averageing 25mpg around town! Of course, that is why I built the engine. Mpg and gobs of it. I rebuilt the transmission adding three clutch plates each clutch, graphite drums, and shift kit. She will still carry, 12,500lbs on the tongue, and tow 45,000lbs rolling.
I do like burbans.
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Post by rhodescabbin on Oct 31, 2006 2:52:18 GMT -5
25 miles to the Gallon??? MAN!!!!!!!!! I get 8 MPG in the mountains and 12 on the hwy...People in Mitchell have named it (TIMEX) Takes a lickin and keeps on tickin lol...The motor a 350 has been in the family since 1972, was in a 72 Chevy PU 1/2 ton that got twisted in half in a horrible 13 car pile up in Walla Walla WA Dad put the motor in this old Suburban Body and got it to running and it hasn't stopped but just briefly for very rare problems since 1993...Well I was gonna post a picture but I can't find one. Ya Burbuns, I am sold on them, very good rigs for our kind of Hobbies, heck I take mine digging all the time when nightfall comes I roll everything out and lay out a mat and snooze lol...But with gas prices I kept her parked alot this summer...TTYL-Dale Rhode
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Post by LCARS on Oct 31, 2006 10:44:55 GMT -5
...the thingy that looks like a flyin saucer with a vacum line on it...  I'll go out on a limb and guess "torque converter". |
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KG1960
has rocks in the head
Member since August 2008
Posts: 512
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Post by KG1960 on Oct 31, 2006 12:33:05 GMT -5
I think he means a vacuum diaphram, what doc called the modulator. Do what doc said, or even just replace the whole vacuum line with a new one - easy and cheap. See if you can test if the modulator holds vacuum or leaks. Although you would think that they checked it when they flushed and cleaned the screen, but you never know.
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Post by docone31 on Oct 31, 2006 14:12:18 GMT -5
No, it is not torque convertor. I am replacing my vaccum line on my TH400 with an all metal line, hard wired to the manifold. The modulator is on the right side of the transmission, it will have a short piece of rubber hose connecting to a steel line. This line goes up the firewall to the manifold, where it has a short piece of rubber connecting it to a white metal fitting on the manifold itself.
It probably isn't the modulator, when they go the transmission stays in first gear. It might be the governor gear but when that goes, it goes fast. You be needing a rebuild sooner or later. When the transmission starts getting slow to respond from park, after sitting overnight, it is all the seals inside the transmission. The only repair is to pull the trans and do an overhaul. The kit with clutches is only 200$ more than the seal kit. When I pull a trans, I do a complete fix. I do not like pulling them twice.
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