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05-29-2005, 07:00 PM | #1 |
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Join Date: Apr 2005
Location: OR
Posts: 235
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TH400 won't shift out of first
Took my '79 C20 with a 454/TH400 for a drive yesterday. The trans would not shift out of first unless I manually shifted into first and then back to drive. When I got the truck a couple months and about 50 miles ago, it shifted OK, but seemed to shift at a pretty high RPM. (don't know if anything was wrong or not, I don't have a tach and have never driven anything else with a TH400)
What might be wrong? The fluid level is ok, it could stand to be changed, but it's not that dirty either. |
05-29-2005, 07:04 PM | #2 |
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Join Date: Dec 2003
Location: Texas
Posts: 2,686
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Check the vaccum line going to the modulator Located on the passenger side of the transmission Sounds like the line may have come unatttached . Has this truck been running long has it worked right in the past? Or is this a trial run on this setup?
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05-29-2005, 07:36 PM | #3 |
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Join Date: Jun 2004
Location: warr acres,oklahoma
Posts: 650
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make sure you have a good strong intake vacuum(off of the intake,not carb)a good line or hose,and a good modulator.sometimes if you pull off the vacuum line and fluid comes out of line or tip of modulator,mod will be bad.go get a filter kit,fluid,k&w trans x,module,and you should be good to go for a while again,especially if you say it`s time to change filter again anyway.
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05-29-2005, 07:45 PM | #4 | |
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Join Date: Apr 2005
Location: OR
Posts: 235
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Quote:
Is this the metal line that hooks up to the manifold near the distributor? That snapped off while I was setting the timing...forgot about it until now. Don't know anything about the past of this truck, though according to the mileage on the title it has gone 40,000 miles in the last two years. It came with 5 bills of sales from people who never put the title in their name, so apparently it has bounced around alot recently. I'm pretty sure the guy I bought it from just wanted some cash for meth... |
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05-29-2005, 07:52 PM | #5 |
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Join Date: Jun 2004
Location: warr acres,oklahoma
Posts: 650
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that`s it!!!!
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05-29-2005, 11:44 PM | #6 |
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Join Date: May 2003
Location: Fort McMurray, Alberta
Posts: 7,915
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Yep, thats what happens when the vac modulator isn't hooked up
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1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap) |
05-29-2005, 11:51 PM | #7 |
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Join Date: Apr 2005
Location: OR
Posts: 235
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Great...easy fix instead of a tranny rebuild.
It's alot of fun going down the highway in first on 7 cylinders though... |
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