12-31-2023, 11:33 AM | #76 |
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Re: Shifting at high RPM
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12-31-2023, 11:51 AM | #77 | |
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Re: Shifting at high RPM
Quote:
The only connector is coming from the 4x4 firewall to the top left side, I think it’s for 4x4 engagement and light, See pictures
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
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12-31-2023, 12:05 PM | #78 | |
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Re: Shifting at high RPM
Quote:
Hopefully I can load it
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
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12-31-2023, 12:06 PM | #79 |
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Re: Shifting at high RPM
Pictures are attached,
The website will not allow me to upload more than 2, or it keeps say your message is toooooo short
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
12-31-2023, 12:15 PM | #80 |
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Re: Shifting at high RPM
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12-31-2023, 12:19 PM | #81 |
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Re: Shifting at high RPM
I did disconnected it, as I mentioned before, nothing.
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01-04-2024, 10:24 AM | #82 |
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Re: Shifting at high RPM
Any ideas?
I’m not getting any luck with this trans. I managed to get me a vacuum gauge but I’m not sure what to do or to look for? Any suggestions
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
01-04-2024, 10:27 AM | #83 | |
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Re: Shifting at high RPM
Quote:
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
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01-04-2024, 12:22 PM | #84 | |
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Re: Shifting at high RPM
Quote:
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01-04-2024, 12:24 PM | #85 |
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Re: Shifting at high RPM
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01-04-2024, 12:38 PM | #86 |
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Re: Shifting at high RPM
Yes I did and nothing still will not shift from 1st gear
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
01-04-2024, 12:39 PM | #87 |
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Re: Shifting at high RPM
I see, so to avoid any spillage I should start the truck for few minutes
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01-04-2024, 12:43 PM | #88 |
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Re: Shifting at high RPM
What if anything does the transmission do? What happens when you try to drive it, Forward shifter in D? 2nd? 1st? What happens with shifter in reverse?
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01-04-2024, 12:53 PM | #89 | |
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Re: Shifting at high RPM
Quote:
The only issue is shifting from 1st to 2ed. I’m picking my brain on what happens from before painting the truck and replacing the valve stems, to now. No one worked on the trans, or the manifold, only the valves.
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01-04-2024, 12:56 PM | #90 |
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Re: Shifting at high RPM
When it is in Drive or 2nd when you start out does it ever shift or does it just stay in 1st gear? When in Reverse it moves normally?
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01-04-2024, 12:58 PM | #91 |
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Re: Shifting at high RPM
When you removed vacum modulator did you take the valve out behind the modulator? Did it move freely if you took it out and replaced it?
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01-04-2024, 01:13 PM | #92 | |
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Re: Shifting at high RPM
Quote:
In reverse it’s normal, I did try in 2ed but didn’t notice it shifted I’ll check and see Wow In 2ed it did shift from 1 to 2 so smoothly I barely notice it, I put it in D and I think it shifted from 1 to 2, Tomorrow I’ll do full test and I’ll update you
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 Last edited by Captain J; 01-04-2024 at 01:46 PM. |
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01-04-2024, 01:19 PM | #93 | |
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Re: Shifting at high RPM
Quote:
Unless I’m not doing it correctly ( using a magnet), First time no oil came out just few drops, second time about 2ltr came gushing out.
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
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01-08-2024, 05:26 AM | #94 |
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Re: Shifting at high RPM
Greetings to you all for helping out in my truck gear issue.
Update I test drive the truck last night, and it shifts in all gears, I don’t know what happened, but it’s working fine, Again, thank you all for your suggestions and recommendations, I wish I knew what was wrong with the tranny.
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
01-08-2024, 12:23 PM | #95 |
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Re: Shifting at high RPM
Probably a piece of that silicone
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01-08-2024, 12:39 PM | #96 |
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Re: Shifting at high RPM
I have no clue, but it’s working now and that’s important.
Maybe the gremlins were there
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01-09-2024, 11:08 AM | #97 |
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Re: Shifting at high RPM
I figured it would be something simple lol. It probable was the sticking modulator valve. They are supposed to slide out easily. I didn't think we were going to get any further with the diagnosis without an actual vacuum reading at the modulator. Happy ending anyway.
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01-09-2024, 11:56 AM | #98 | |
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Re: Shifting at high RPM
Quote:
Regarding the vacuum readings, what is the correct reading in psi? Yeah happy ending
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01-09-2024, 02:28 PM | #99 |
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Re: Shifting at high RPM
manifold vacuum at the end of the hose 14-15 inches ----ish
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01-09-2024, 02:40 PM | #100 |
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Re: Shifting at high RPM
Ok, I’ll check
Thanks
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
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