360 magnum and 727 issues.

[RevboxRyan]

Have mild 360 magnum .030 over, smallish roller cam mated to 727 hughes 3000 stall and trans go TF2 I believe shift kit. The issue I'm having is I believe the trans/converter is pushing on crankshaft has thrust bearing worn out and crank is wore now as well. Started hearing light ticking last fall right before winter hibernation now had it around block couple of times and it's got worse. So pulled pan off and checked it out found bad crank and thrust surfaces. Will a torque converter fail and start pushing against crankshaft? I can walk crank back and forth with pry bar probably 1/8 inch or better. Hughes torque converter and trans is probably 6ish years old been behind a couple different engines didn't have a problem with prior engine.

 

[RustyRatRod]

It sure can, if the converter "balloons. However, that's normally associated with nitrous, heavy or over loaded vehicles. I see you have a truck, so if you had it loaded and have really yammed on it some while loaded, then there you go. Also a higher stall coupled with a heavy vehicle (truck) with stupid highway gears like a 2.93 can do it. Anything that can unduly "load" the converter can do it. With a truck, I'd use a MINIMUM of a 3.55 gear and I wouldn't like that. I'd rather have a 3.91 of lower. The best thing to do is confirm the converter has ballooned and then, get one with an anti ballooning plate on the front.....like for nitrous. Other than not having the converter installed all the way in to start with, that's about all I can think of.

 

[408 swinger]

Was the Magnum a manual transmission engine? Removal of the pilot bearing is necessary. I would think this would create enough clearance issue it would have been obvious. I think that bearing can get pushed farther in than it should, thus creating a little more room for the convertor hub. Usually if the convertor isn't seated properly, it'll wipe out the trans pump. All things considered, Rusty's diagnosis is probably spot on.

 

[RevboxRyan]

It sure can, if the converter "balloons. However, that's normally associated with nitrous, heavy or over loaded vehicles. I see you have a truck, so if you had it loaded and have really yammed on it some while loaded, then there you go. Also a higher stall coupled with a heavy vehicle (truck) with stupid highway gears like a 2.93 can do it. Anything that can unduly "load" the converter can do it. With a truck, I'd use a MINIMUM of a 3.55 gear and I wouldn't like that. I'd rather have a 3.91 of lower. The best thing to do is confirm the converter has ballooned and then, get one with an anti ballooning plate on the front.....like for nitrous. Other than not having the converter installed all the way in to start with, that's about all I can think of.

3.55 gears and 26-29 inch tires never loaded or trailer pulled. But I don't beat the crap outta of it just one of my weekend toys.

 

[RustyRatRod]

3.55 gears and 26-29 inch tires never loaded or trailer pulled. But I don't beat the crap outta of it just one of my weekend toys.

Then if the converter is ballooned, I'm guessing it wasn't a very well made one. I'd look into one with a balloon plate......AFTER I verified that's what's wrong. And that's all that I can think of what it is. Otherwise, it had to be assembled that way.

 

[RevboxRyan]

Was the Magnum a manual transmission engine? Removal of the pilot bearing is necessary. I would think this would create enough clearance issue it would have been obvious. I think that bearing can get pushed farther in than it should, thus creating a little more room for the convertor hub. Usually if the convertor isn't seated properly, it'll wipe out the trans pump. All things considered, Rusty's diagnosis is probably spot on.irque converter and trans would never go together with the magnum bearing style in it

Was the Magnum a manual transmission engine? Removal of the pilot bearing is necessary. I would think this would create enough clearance issue it would have been obvious. I think that bearing can get pushed farther in than it should, thus creating a little more room for the convertor hub. Usually if the convertor isn't seated properly, it'll wipe out the trans pump. All things considered, Rusty's diagnosis is probably spot on.

I don't think you could ever get converter close enough to get bolts to start in flexplate with magnum style roller bearing in there. I know that's not it I refreshened the motor last spring converter is seated correctly.

 

[rbkt65]

We had a problem with a rear main oil seal leak. The convertor was real close, didn't have to pull it up much to get it bolted together. Solution was to take a mid-plate and trace it so only part of it would bolt between the block and trans. Problem solved, for us.

 

[Bobzilla]

Have mild 360 magnum .030 over, smallish roller cam mated to 727 hughes 3000 stall and trans go TF2 I believe shift kit. The issue I'm having is I believe the trans/converter is pushing on crankshaft has thrust bearing worn out and crank is wore now as well. Started hearing light ticking last fall right before winter hibernation now had it around block couple of times and it's got worse. So pulled pan off and checked it out found bad crank and thrust surfaces. Will a torque converter fail and start pushing against crankshaft? I can walk crank back and forth with pry bar probably 1/8 inch or better. Hughes torque converter and trans is probably 6ish years old been behind a couple different engines didn't have a problem with prior engine.

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Was that shift kit always in that trans behind the other engines? Was anything changed in the transmission when it was placed behind this engine?
I am thinking you have a pressure problem in the transmission. High pressure is pushing the converter forward. Not really a converter problem.

 

[RevboxRyan]

Was that shift kit always in that trans behind the other engines? Was anything changed in the transmission when it was placed behind this engine?
I am thinking you have a pressure problem in the transmission. High pressure is pushing the converter forward. Not really a converter problem.

Had it in my old Volare for a few years behind a different 360 magnum was fine. Its same trans, shift kit and converter before in went in the D150. Ive put probably 10-12 727 transmissions together with this same shift kit some of mine and some for friends all work good. This motor i did a refresh on this motor last spring so kinda sucks. Guess I'll throw it back together and get a guage on it maybe something stuck in valve body or broke.