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Serious sm465 problems

A

Apocalypse

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On my project blazer im having a problem with the transmission and stalling. first off right now im running 456/205 3.91 ratio with 35s im having to keep the engine rpm around 3000 rpm to get the truck moving (in the granny unsyncro low) or else it stalls. the truck shakes while letting out on the clutch and the engine tries to die. once in gear shifting to first is a pain and i usualy have to wind out to 4500-5k rpm to get enough speed before first(not granny) stalls out again. Is there some sort of special way to tune an engine for a manual trans vs auto? from what i read i should have enough gear not to have to dog the truck so hard to get it going in the 6.55to1 ratio.
 
something is definatly wrong... my pickup i can pop the clutch in granny low at an idle and the thing wont die, and i can pretty much do the same for 1st, and thats on 39.5's with 4.10s
 
Maybe im steeping out on the wrong limb here, or is the clutch hammered and the flywheel all glazed, hence the rpm to get it to move and the shaking from the flywheel.....?


I have 465/205 with 39.5 and 456s and can ease my clutch out and crawl along...
 
rob h said:
Maybe im steeping out on the wrong limb here, or is the clutch hammered and the flywheel all glazed, hence the rpm to get it to move and the shaking from the flywheel.....?


I have 465/205 with 39.5 and 456s and can ease my clutch out and crawl along...
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I think that i would have to agree, sounds like a clutch issue. Maybe it just needs to be adjusted.
 
try adjusting the clutch if it still does it then the flywheel needs turned and new clutch cause rpms that high I'd be smoking tire and braking u joints
 
Even a messed up clutch shouldn't cause this problem. The chattering yes, but not the stalling. My old Jimmy had 2.73's 33" tires and the SM 465. I had to use Low gear to get it moving, and 4th was more like an overdrive than anything else. If I tried to start in second like you're supposed to the clutch would chatter brutally and it'd take quite a bit of RPM's to prevent it from stalling.

Unless his shifter mechanism is messed up and he is actually trying to start out in 3rd gear? That would explain the symptoms...

Rene
 
no the rpm is to keep the engine from stalling out. the clutch is grabbing pretty well. but the only time i dont have to be so hard on it is when its in _(L)_ 1 2 3 and 4wd/low but it still tries to stall out and have to feather the clutch to keep it from happening. ive tried adjusting the idle up to around 1200 rpm but still not getting results. i was under the impression you should be able to idle slowly with no gas when in crawl gear on a level surface
 
I don't think your issue is in the trans, sounds like a motor issue. I can row through all 4 gears without ever touching the throttle if I want.

Have you checked timing on the engine?

What kind of shape are your plug wires, dizzy cap and rotor in? Ignintion breaking down under load comes to mind as well.
 
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is the engine running normal? we should get this covered first:haha: idle, off idle, is it missing? basically is it fine no load?
 
timing is set at 5 degrees btdc any more and i get horrible ping. carb is set for best vacuum at 10 inches at idle. not sure what the engine should be running at and have checked for vacuum leaks. vacuum advance is from manifold source. Nothing i do to the engine seems to be a correct tune as its a constant struggle between detonation and running right. im going to go through the ignition system soon and see if that fixes the problem.

I still have yet to swap the axles from the m1009 cucv for the 4.56 gear ratio. and hope that alleviates a bit of the problem. On a side note. can anyone tell me the best place to get any type of performance parts such as heavy duty syncros or shifter parts for the 465? haven't had any luck online tracking them down besides the rebuild kits on novak.
 
I agree, you either have a serious lack of power in the engine, or one heck of a load on the drive-train.
If the engine will rev up to 3K, it seems unreal that it does not have enough power to pull off in low gear.
Most of the time when an engine is that weak, its sputtering and having problems just revving up.

Just to eliminate a variable, try parking it on a slight hill, push in the clutch, and see if it will roll downhill in gear.
Remember, if the engine is off, you will not have power brakes or steering, so be sure of what it at the bottom of the hill.
If it won't roll down a hill, you may have serious problems in the transmission.

J.
 
Fordum said:
I agree, you either have a serious lack of power in the engine, or one heck of a load on the drive-train.
If the engine will rev up to 3K, it seems unreal that it does not have enough power to pull off in low gear.
Most of the time when an engine is that weak, its sputtering and having problems just revving up.

Just to eliminate a variable, try parking it on a slight hill, push in the clutch, and see if it will roll downhill in gear.
Remember, if the engine is off, you will not have power brakes or steering, so be sure of what it at the bottom of the hill.
If it won't roll down a hill, you may have serious problems in the transmission.

J.
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Will try that in the morning. im going to dig out the video cam tomorrow and see if i cant post a you-tube vid and link it here so what im talking about might be a bit more clarified as a picture is worth a thousand words.
 
Apocalypse said:
Will try that in the morning. im going to dig out the video cam tomorrow and see if i cant post a you-tube vid and link it here so what im talking about might be a bit more clarified as a picture is worth a thousand words.
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video would help a lot!
 
Sounds to me like the brakes are sticking. The only time I've had those kinda issues you are talking about is when I forget the parking brake is on. It'll back up fine, but wont go forward without some serious help from the skinny pedal. Other than that I couldnt think of anything else transmission related that would produce those syptoms without a whole lotta noise.
 
cabledawg said:
Sounds to me like the brakes are sticking. The only time I've had those kinda issues you are talking about is when I forget the parking brake is on. It'll back up fine, but wont go forward without some serious help from the skinny pedal. Other than that I couldnt think of anything else transmission related that would produce those syptoms without a whole lotta noise.
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I agree..when i picked up the DR.s car . i hed to back down a steep drive. when we had it loaded i forgot to release the parking brake.:doah:everytime i let off the gas it was hell getting going in the next gear.oopsy..the cool thing about a manual trans is,,,, it does not matter how shatty the engine runs.:bow:if there is no neutral safety switch, you can go down the road using the starter.i have done it.thats how i found out i had a locked up caliper on JR. i push it out of the doorway. {why waste gas starting it}. it was a bastard to move,so i check and guess what?drivers side caliper was froze.
 
If all you have is 10" of vacum you have engine problems.at 10" of vacum your power brakes probably don`t work very well either.You either have one hell of a vacum leak like the booster hose isn`t connected.or like are laborer likes to say no compression.How much blow by comes out of your valve cover breathers with it running.
 
blaznjon said:
If all you have is 10" of vacuum you have engine problems.at 10" of vacum your power brakes probably don`t work very well either.You either have one hell of a vacuum leak like the booster hose isn`t connected.or like are laborer likes to say no compression.How much blow by comes out of your valve cover breathers with it running.
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Im actually glad you mentioned this. when i unpluged the vacum line from the valve cover i noticed the engine dosent run nearly as well. and i plugged the vacuum line with my thumb so it wasent running lean from the loss of vacume. just seems like theres a lot of pressure building up in the crank case so the blowby might be a very real possibility.
 
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