What are normal shift points?

[GFB]

M1009, With light to medium throttle input it shifts at around 21mph and 42mph. Is this normal or do I need to dig further? Shifts aren't overly firm, but it's kinda annoying cruising through town at 35 and you have to to up to 40 to get it to shift and then slow down. Replaced vacuum lines already and will do a filter/fluid change just because it probably hasn't ever been done. The TM shows a special spacer tool for adjusting the valve on the injection pump, of course I don't have it. Which way should I adjust it, or should I even mess with it? I'm under the impression that it's not the modulator because you would have to take it nearly to governed rpm to get it to shift if it was bad, correct?

 

[odonnys]

That's about where mine shifts. Luckily the speed limits are 45 or 50 on the island.

 

[ralbelt]

my M1008 is at about 12 and 24, change your vacume hoses and adj the vac valve if necessary.

 

[isaacucv]

my M1008 is at about 12 and 24, change your vacume hoses and adj the vac valve if necessary.

thats about where mine shifts too. I cant wait until I get the 37's on there though

 

[odonnys]

Don't the 1009's and 1008's have different gearing?

 

[GFB]

my M1008 is at about 12 and 24, change your vacume hoses and adj the vac valve if necessary.

your 1008 has a much higher gear ratio and will shift earlier. My question will only apply to a M1009.

 

[isaacucv]

Don't the 1009's and 1008's have different gearing?

yea the 08 has 4.56:1 and the 09 has 3.08:1 ratios

 

[suggsdr]

CFB- My m1009 is about the same. I don't think you have any issues with the transmission or the vac reg.a while back it was hard to shift to 3 found the vac hose adapter broke done away with the adapter & replaced all vac hoses ran great.look at all your vac hoses.
good luck

 

[USAWEAPON777]

Yes the m1008 has 4.56 gears while I believe the m1009 has 3.08 . So the blazer will shift at much higher speeds. My m1008 shifts to 3rd at 25mph

 

[odonnys]

I changed the hoses fluid and filter when I got my 1009 and that's where mine shifts.

 

[IdahoPlowboy]

I changed the hoses fluid and filter when I got my 1009 and that's where mine shifts.

I did the same and my shifts the same.

 

[GFB]

Status quo says it's ok. Thaks guys.

 

[odonnys]

Yip. Yer very welcome sir!

 

[cmroles]

Status quo says it's ok. Thaks guys.

Try lifting off the throttle a little bit at around 35 and see if it makes it shift.

If I have steady "medium" throttle applied to my M1009 it will shift to 2nd at about 25mph and into 3rd at about 42-43mph.

If I lift off throttle at around 35 it will kick up to 3rd, then I just put my foot back down and putter along at 35mph in 3rd gear.

 

[panzerwillie]

there is a few factors here , i adjusted mine to shift 1-2 15mph ans 2-3 at 20-25mph , you can do that by losing the vacum regulator bolts {3/8 wrench] and pull the regulator back towards the rear fire wall the more you move it back the faster it shifts, now the vacuum pump has to deliver between 22-25 inches of vacuum before the regulator and all hook up you can check he vacuum at the trany vacuum module and it needs to have 12-15 inches at idle for it to shift smooth and quick at ligth trottle, if it does not have between 12-15 inches the regulator is getting old that is if you have 25 inches before the regulator at idle, now there is also a adjustment in the trany module {last result} inside where the vacuum hose plugs in you can turn it in or out with a small flat head, turn it clock wise will make the shift delay and fim up a little, counter clock fast and smooth, even if te cacuum sorce is low you can remove the insert all should make the shifts 20 and about 34 mph, usualy when the regulator at he pump is bad you will only get 7 inches at the trany with it adjusted all the wayback, i get 21-25mpg on my driving it like a old lady and i'm runing 256 gears on my and had 273 gears before {308 stock} i drive about 400 -500miles a week 80% HWY , make sure all the hoses are good you best friend is a vacuum gauge....

 

[BIG_RED]

Shift points on my M1009 are close. I find that if I'm driving close to the speed it should shift (42ish), and it's not shifting, and there's traffic ahead of me so that I can't accelerate to 46 and let off, if I stomp the pedal (not quite to where the downshift switch kicks in) just for a sec and then let go, it shifts. (This is how I use 3rd gear in the city).

 

[Warthog]

......The TM shows a special spacer tool for adjusting the valve on the injection pump, of course I don't have it. Which way should I adjust it, or should I even mess with it?

Using the Advanced Search for "vacuum" in the CUCV forum produces many threads where the vacuum valve has been discussed.

Here is one I wrote. I didn't have the tool either and didn't want to buy one.

http://www.steelsoldiers.com/cucv/50568-cucv-throttle-vacuum-valve-adjustment.html

 

[Ando427]

Do you know where I can purchase a new rubber boot portion of the vacuum valve where the vacuum lines plug in? If not, do and I have to buy a whole new vacuum regulator, what is the on for that?

 

[doghead]

It's not available.

Just put the lines directly on the regulator.

The rubber block simply made it impossible to get the hoses reversed.

 

[cucvrus]

Just remember top T to transmission modulator and bottom B to back of engine vacuum pump. I learned that here when I was listening in class. Good Luck. But if you really think you need on of the rubber blocks. They were used on many GM engines back in the same time period. Check out the older GM products in the YOUPULLIT's near you. Happy Holidays.