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post #1 of 5 (permalink) Old 05-04-10, 05:13 PM Thread Starter
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confused 429 Crank Question

I have a 429 with a 4 UAB crank in it now the snout is bent 120 thns so i found a good crank from a 429 but it is a 4U Can someone tell me if this 4U crank will work for my crank that is a 4UAB Please help !

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post #2 of 5 (permalink) Old 05-05-10, 01:33 PM
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cool Re: 429 Crank Question

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Originally Posted by ol37ford View Post
I have a 429 with a 4 UAB crank in it now the snout is bent 120 thns so i found a good crank from a 429 but it is a 4U Can someone tell me if this 4U crank will work for my crank that is a 4UAB Please help !
If you are using an automatic transmission, then the torque converter pilot hole in the rear flange of the crankshaft might be a different diameter (very likely). If so, then you will need another 4UAB crankshaft.

If you are using a manual transmission then the crankshafts are interchangeable.

Paul


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post #3 of 5 (permalink) Old 05-06-10, 05:46 AM Thread Starter
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Re: 429 Crank Question

Ok Thanks ! Were could i find a stock replacement crankshaft ? So far I can only find the wrong ones ! Were could I look or call to maybe find a 4UAB ? Is it possible if I bought one and the pilot was the worng size could a good machine shop mill it open to the right size ? Dont know what else to do !
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post #4 of 5 (permalink) Old 05-06-10, 10:00 AM
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cool Re: 429 Crank Question

Quote:
Originally Posted by ol37ford View Post
Ok Thanks ! Were could i find a stock replacement crankshaft ? So far I can only find the wrong ones ! Were could I look or call to maybe find a 4UAB ? Is it possible if I bought one and the pilot was the worng size could a good machine shop mill it open to the right size ? Dont know what else to do !
I am not 100% positive about the following info, but I think the breakdown is as follows:
  • The 4U & 4UA crankshafts have a 1.85" converter pilot hole in the rear flange
  • The 4UAB crankshaft has a 1.375" pilot in the rear flange.
If the above is correct (and I'm fairly sure it is but I'm not positive), then the 4U and 4UA cran pilots may be bushd down to a 1.375" pilot. Yes, a machine shop could do this for you. Measure the rear pilot diameter of your 4U crank to confirm it is 1.85", but don't press in the bushing until you also look at your 4UAB crankshaft for comparison/verification.

Paul

P.s.: We may have a 4UAB crankshaft over here if you need one....


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post #5 of 5 (permalink) Old 05-06-10, 03:45 PM Thread Starter
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Re: 429 Crank Question

Thanks alot ! I may take you up on that if you have one and if this going to be to much hassle ! Again thanks alot !
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