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Old 04-07-2013, 11:09 PM   #1
damianbryand
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First time drive

Well I drove my truck for the first time today. After 2 months of this and that tinkering I drove it around the block twice. I noticed the tranny wouldn't shift gears. It felt like it stayed in first the entire drive. Any ideas what it could be? It's a turbo 400. Thanks!
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Old 04-07-2013, 11:50 PM   #2
SS Tim
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Re: First time drive

Well from what I read you have a 68 C10, stuck a used motor in front of an unknown trans. Did you ever get the fluid and filter changed? What did the fluid look like? Is the fluid level correct hot? How fast were you driving the truck (no throttle 1-2 upshift is like 5mph and WOT is about 25-30mph)? Is the vacuum modulator hooked up? Did you download the service manuals?
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Old 04-07-2013, 11:52 PM   #3
o6r1man
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Re: First time drive

You can also try and shift it manually and see if it shifts....
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Old 04-08-2013, 08:40 AM   #4
Tom Vogel
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Re: First time drive

Check your vacume lines from the back of the manifold to the modulator, you could have some cracks/leaks.
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Old 04-08-2013, 09:13 PM   #5
68streetrod
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Re: First time drive

Quote:
Originally Posted by Tom Vogel View Post
Check your vacume lines from the back of the manifold to the modulator, you could have some cracks/leaks.
x2 with out vacume it will not shift on a TB400
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Old 04-08-2013, 10:42 PM   #6
JointTech
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Re: First time drive

i dont see how you got around the block 2 times in 1rst?? mine shifts out at 5mph and sounds like its going to blow if i hold it in first.
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Old 04-09-2013, 12:22 AM   #7
buckskins4ever
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Re: First time drive

Agreed...if you hadnt rechecked your vacuum lines, try starting there first. You really should put the trans and power brake booster on dedicated vacuum ports. everything else can share.
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