Help 351 To 460 Problem
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Help 351 To 460 Problem
I am in the process of dropping a 71' 460 from a car in my 76' ford f-250 4x4. I bought conversion motor mounts and dropped the motor, now the crank wont turn by hand. does anyone know what I need to do?
Elder User
Joined: Jul 1999
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From: Missouri
Check the flywheel bolts. Sometimes they are too long and stickout on the backside of the crankshaft and hit the block. If it is a manual tranny and you used a 351/400 bellhousing the clutch fork could be against the pressure plate.
Hotshot
Joined: Dec 2003
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From: iowa
darrin would you please explain why a 351 torque convertor won't work? they use the same torque convertor, and same pilot bearing dia.
But for reference he has a manual gearbox I think greenhighboy hit the nail on the head. Just don't remember the fix right off.
But for reference he has a manual gearbox I think greenhighboy hit the nail on the head. Just don't remember the fix right off.
Posting Guru
Joined: Mar 2006
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From: fargo, nd
sorry... my bad... i looked it up and i guess its the flywheel attached to the converter thats wrong... wrong balance
i just read in my research that when swapping the 429 into a pickup with a 351-400 that you had to use the 429-460 converter because the converter was shorter or output shaft was longer and that left like a half inch between the bellhousing and the block
i just read in my research that when swapping the 429 into a pickup with a 351-400 that you had to use the 429-460 converter because the converter was shorter or output shaft was longer and that left like a half inch between the bellhousing and the block
Last edited by darrin1999; Aug 23, 2006 at 02:23 AM.
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Logistics Pro
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From: Sun River St. George
I wonder where Mr. Green went! This TC business has to do with the diference in TC snouts. Ford used a big snout in FE motors and also used these in early 429 and 460 engines. If you have a big snout TC it will not fit the later crankshafts small snout opening. Some aftermarket TC's will interfere with the Ford flexplate bolts. Easy fix is use the correct TC for your crankshaft and a set of thin head ARP flexplate fasteners. Been there done that and spent the extra money and time.
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Hotshot
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From: iowa
Like I posted though he is using a manual tranny, he sent me an email about this and I made the same recommendation you guys have but was told manual. I have to wonder if greenhighboy doesn't have it right and thats what needs checked first.
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hey guys thanks for the input. My flywheel bolts are not to long I remember checking that. my TC is the 3 finger snout. Yes I have a manual. I backed off the bolts on the tranny to bellhousing and it freed up. Mabey the input shaft is to long and was against the crank , I dont know.All I know is that it will turn bu hand now. Should I be alright to start?
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New User
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hey guys thanks for the input. My flywheel bolts are not to long I remember checking that. my TC is the 3 finger snout. Yes I have a manual. I backed off the bolts on the tranny to bellhousing and it freed up. Mabey the input shaft is to long and was against the crank , I dont know.All I know is that it will turn bu hand now. Should I be alright to start?
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New User
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I put the dust shield back on ,yes. there are no spacers behind the flywheel. I put washers inbetween the tranny and bellhousing and tightened it and it still will turn by hand, but can I leave it like that?
Postmaster
Joined: Apr 2002
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From: Coal country
I see two possibilities:
The torque converter snout is larger than the recess for it in the back of the crank (like William said);
Or,
The torque converter is not fully seated into the transmission (like William said).
The torque converter, when fully seated into the bellhousing, should be at least a full 1/4 inch inside the bell housing. If the back side of the torque converter bolt bosses are even with the edge of the bellhousing, it isn't in far enough.
The torque converter snout is larger than the recess for it in the back of the crank (like William said);
Or,
The torque converter is not fully seated into the transmission (like William said).
The torque converter, when fully seated into the bellhousing, should be at least a full 1/4 inch inside the bell housing. If the back side of the torque converter bolt bosses are even with the edge of the bellhousing, it isn't in far enough.
Elder User
Joined: Jul 1999
Posts: 877
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From: Missouri
I have done four manual trans. 460 swaps using the 351/400 bellhousing and when you use a 11.5"or 12"three finger pressure plate the throwout bearing fork hits the pressure plate. There are two remedies besides using a different clutch. You can either have the flywheel turned down thinner, which is what I do. Or you can make a spacer plate to go between the block and bellhousing. When doing the plate be sure to make sure that the pilot shaft is still reaching the pilot shaft bushing in the end of the crank. You can look through the clutchfork hole to see if this is what is going on.