84cucv1ton
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never had this problem before. shifts hard too.
whats should i look for? thanks
whats should i look for? thanks
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th400 shifting at high rpm
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nk14zp
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Check the modulator and all the hoses to it also the kick down switch under the dash.
lavarok
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From reading threads on this site and doing work on my own M1009; I would suggest checking the following:
1. Is there vacuum coming out of vac pump?
2. Is there vacuum coming out of the regulator ( side of IP )
3. Vac lines
4. Vac Modulator on side of tranny
1. Is there vacuum coming out of vac pump?
2. Is there vacuum coming out of the regulator ( side of IP )
3. Vac lines
4. Vac Modulator on side of tranny
84cucv1ton
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kick down switch? didnt know that one. can you adjust a modulator? thanks
that truck got it hard! hope everyone is ok
that truck got it hard! hope everyone is ok
nk14zp
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`I am still not at 70% other party killed instantly.
84cucv1ton
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wow sorry to hear that. hope you get better soon.
lavarok
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The new modulator I bought last week was adjustable. The old one I took off was not.
However, I chose to adjust my shift point at the regulator; slightly rotating mine towards the cab to decrease the rpm shift point.
I went from 13 Hg to 14Hg at idle at the regulator output.
However, I chose to adjust my shift point at the regulator; slightly rotating mine towards the cab to decrease the rpm shift point.
I went from 13 Hg to 14Hg at idle at the regulator output.
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84cucv1ton
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that on the side of the injection pump?
nk14zp
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The modulator is on the back of trany.
84cucv1ton
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sorry i meant the regulator
nk14zp
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Yep thats on the ip.
armytruck63
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Mine did that once. I had old and leaky vacuum hoses. An easy fix 
lavarok
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The regulator (where I made my adjustment ) is on the side of the IP.
See attached, #10
See attached, #10
Attachments
nk14zp
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Did this start about the same time as relay sticking?
dunedigger
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I had this problem and adjusted the regulator on the side of the injector pump and it shifts perfect now.
84cucv1ton
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thanks relay sticks on a different truck
jkade72
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where do you adjust the regulator? It is hard to tell in that diagram. Mine likes to get up in the rpms from 1st to 2nd gear and I checked the lines.
Thanks
Thanks
motormayhem
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How do you check for vacuum at the IP? Mine winds out in both shifts and the lines are good.
dunedigger
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You will notice two screws that hold the assembly in place and have obvious slots for play in the adjustment. losten those two screws and the whole thing will rotate back and fouth to adjust. It should be easy to reference where it was before you adjust it from the clean spots where the bolts were.