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M1008 transmission
- Thread starter Chevykev
- Start date
Skinny
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Your post is lacking quite a bit of information. If slow to change up means it is waiting to make the shift till redline you probably have a rotted out vacuum line to the modulator.
Yes it just seems to take too long to change up & does rev quite a bit.
Skinny
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Check the vacuum line coming out of the plastic box attached to the side of the injection pump. That line goes to a metal tube under the intake manifold then down to the modulator on the side of the transmission with a little short piece of rubber in between periods probably rotted out somewhere.
If the line looks ok put a vacuum gauge on the end where it plugs in to the modulator and see if vacuum is there...you can also check at the pump as well...both of mine have a t with one end capped at the pump...I replaced both as one was cracked up and leaking.
MarcusOReallyus
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The word for that is, "shift".
Vacuum lines. Cheap and easy to replace. First place to look.
Give him a break...he's from the UK...they say stuff like fish n chips too...I'm sure if you said soda up the midwest of the US people would correct you and say POP!! lol just giving you a hard time.
MarcusOReallyus
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Oh, my bad. I didn't realize he suffers from that tragic handicap. Those Brits are all messed up. They think chips are crisps, and cookies are biscuits, and all kinds of crazy stuff.
They even pronounce the "L" in "solder"!! Everybody knows it's pronounced, "sodder"! They actually say it like it's written! Can you believe that?
Oh, wait.....
cucvmule
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And be gentle with the plastic-rubber valve Tee on the side of the injector pump in front of the engine as they are not to robust and split the rubber easily after many years. As Skinny has said the vacuum lines will go soft and some brittle. Check all connections to see if it is just a bad end of line and can have the end nipped off and put back on, just to check. The transmission modulator valve is another bad spot with like a 4 inch long vacuum line that goes soft and slips off.
The vacuum pump is easy to check also.
Check into the TM's and go through the trouble shooting section and read about particulars to familiarize yourself with components in the vacuum system.
The vacuum pump is easy to check also.
Check into the TM's and go through the trouble shooting section and read about particulars to familiarize yourself with components in the vacuum system.
MarcusOReallyus
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Yes, be gentle, as in, probably just replace them all, if they are original.
I just did a quick check and found the replacement process instructions start on page 356 of the -20 (TM9-2320-289-20), which makes me think the troubleshooting section is probably in the -10.
If you aren't familiar with the TMs, you might want to check this out.
Yes thats low...I do ask though if the line going to the trans is ok as if it is leaking the vacuum will be low...unless you have it hooked not to the tee but on the actual pump which is what you wrote but just want to make sure.
Yes, straight onto pump.
looks like the pump has let the smoke out...can you get one out your way?
One of our parts suppliers can get one shipped in, in about 2 weeks, I normally use rockauto but they're out of stock
vanaisa
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maybe you can buy pump here if someone in US is willing to send core to Hilbilly?
www.hillbillywizard.com
Or here:
www.accuratediesel.com
GM Diesel Vacuum Pump
Hillbilly Wizard sells the hard-to-find parts you need to build your project vehicle!
www.hillbillywizard.com
Or here:
6.2 Diesel Vacuum Pump POD Replacement | Accurate Diesel
Get your truck back up and running with this 6.2 diesel vacuum pump pod. This brand-new OEM component replaces the upper pod part of your GM's pump.
www.accuratediesel.com
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ezgn
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Amazon vacuum pump pod replacement 90-1008 $87.34 read the reviews it works for the 6.2 cucv diesels.maybe you can buy pump here if someone in US is willing to send core to Hilbilly?
GM Diesel Vacuum Pump
Hillbilly Wizard sells the hard-to-find parts you need to build your project vehicle!
Or here:
6.2 Diesel Vacuum Pump POD Replacement | Accurate Diesel
Get your truck back up and running with this 6.2 diesel vacuum pump pod. This brand-new OEM component replaces the upper pod part of your GM's pump.
Thanks, found one on U.S ebay. On its way over now.
Why doesn't someone make these things with replaceable diaphragms?
I'm wondering if you can just pull the POD off of one of these more readily available ones and use it. It looks like the same POD.
88-95 GM Chevy 6.2 6.5L Vacuum Pump W/AC Dorman 904-804 (2096) | eBay
I'm wondering if you can just pull the POD off of one of these more readily available ones and use it. It looks like the same POD.
88-95 GM Chevy 6.2 6.5L Vacuum Pump W/AC Dorman 904-804 (2096) | eBay
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