soft tranny
Thread Starter
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Fleet Mechanic
Joined: Feb 2010
Posts: 1,742
Likes: 5
From: Near St. Joseph,MO
soft tranny
No, not the kind you were wishing for. 
My truck has not felt like it's putting power down like it seems like it should since I bought it. It's got a 460 auto and I believe 4;10 gears. Now I know it's no drag racer, but it seems to me it should at least have some take off power. The 460 runs great, 4b edelbrock, alum intake, electronic ignition,, punch the gas and it wakes right up.
I changed the trans filter/fluid hoping that would help, which it did some but not enough. It doesn't really feel like it's slipping, more like it's just not transferring power from engine to driveshaft if that makes sense. Fluid wasn't burnt, filter was dirty but nothing bad. The only thing I can think is maybe it's the torque converter?? I know nothing about TC's, I've always been into manual vehicles.
Any thoughts on this? I would think even with an auto, a strong 460 should be able to light up the tires a little. I'm not hugely annoyed by it, the engine will be bolted up to a 4 spd in the spring, I just hate not knowing what the reason is. Thanks
My truck has not felt like it's putting power down like it seems like it should since I bought it. It's got a 460 auto and I believe 4;10 gears. Now I know it's no drag racer, but it seems to me it should at least have some take off power. The 460 runs great, 4b edelbrock, alum intake, electronic ignition,, punch the gas and it wakes right up.
I changed the trans filter/fluid hoping that would help, which it did some but not enough. It doesn't really feel like it's slipping, more like it's just not transferring power from engine to driveshaft if that makes sense. Fluid wasn't burnt, filter was dirty but nothing bad. The only thing I can think is maybe it's the torque converter?? I know nothing about TC's, I've always been into manual vehicles.
Any thoughts on this? I would think even with an auto, a strong 460 should be able to light up the tires a little. I'm not hugely annoyed by it, the engine will be bolted up to a 4 spd in the spring, I just hate not knowing what the reason is. Thanks
Post Fiend
Joined: Mar 2011
Posts: 8,501
Likes: 4
From: Lynchburg, VA
You can do a stall test to check the function of the stator in the torque converter. You'll need a tachometer for the test. Hold the brake down firmly and rev the engine up till the brakes can't hold the truck any longer. Record the RPM that the truck starts creeping forward.
You can also check the amount of slip in the TC by comparing vehicle speed to the engine RPM/rear end ratio/tire size. Crunch the numbers to figure out what the transmission input shaft is turning at and compare that to the engine RPM.
Have you checked the plugs to see how well the engine is tuned?
You can also check the amount of slip in the TC by comparing vehicle speed to the engine RPM/rear end ratio/tire size. Crunch the numbers to figure out what the transmission input shaft is turning at and compare that to the engine RPM.
Have you checked the plugs to see how well the engine is tuned?
Thread Starter
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Fleet Mechanic
Joined: Feb 2010
Posts: 1,742
Likes: 5
From: Near St. Joseph,MO
Ok, I'll try that to get an idea. I already installed a tach so that'll be easy.
No, haven't messed with the engine other than hooking up the electric choke. Running like it is, I hate to do anything and risk messing it up, lol. I have been planning a complete tuneup soon anyway so I may just go ahead and do it.
No, haven't messed with the engine other than hooking up the electric choke. Running like it is, I hate to do anything and risk messing it up, lol. I have been planning a complete tuneup soon anyway so I may just go ahead and do it.
Post Fiend
Joined: Mar 2011
Posts: 8,501
Likes: 4
From: Lynchburg, VA
Did you buy the truck with the performance parts already on it, or did you put them on? If you put them on, they need to be tuned. The chances of a carb being set up right straight out of the box are slim to none.
Thread Starter
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Fleet Mechanic
Joined: Feb 2010
Posts: 1,742
Likes: 5
From: Near St. Joseph,MO
I tried the brake/gas and at around 2000 it started moving. Figure another 500 for error, but it seems ok.
Maybe it's just the nature of the beast, I'm not used to an auto so maybe everything is really fine and I'm just imagining things.
Maybe it's just the nature of the beast, I'm not used to an auto so maybe everything is really fine and I'm just imagining things.
Post Fiend
Joined: Mar 2011
Posts: 8,501
Likes: 4
From: Lynchburg, VA
If you're used to sticks, it's probably just the nature of the beast. Auto trannys always have a spongy feel to them. That's part of the reason I prefer manuals.
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Fleet Mechanic
Joined: Feb 2010
Posts: 1,742
Likes: 5
From: Near St. Joseph,MO
My 75 monte had a turbo350 with shift kit, that must be why I expect more out of this, lol. As soon as I can afford the clutch, the 460 will be in my Scab and no more auto worries. 
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