340 T/A crank?
#3069201
08/18/22 01:10 PM
08/18/22 01:10 PM
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Joined: Jun 2003
Posts: 2,412 Weatherford, Texas
RapidusMaximus
OP
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OP
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Joined: Jun 2003
Posts: 2,412
Weatherford, Texas
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Can anyone confirm if this crank is or is not a T/A crank, I’ve googled and can’t seem to confirm, the guy I got it from says it’s a TA, one of my small block buddies says it’s a 318…what say yee Moparts gurus???
1968 Plymouth GTX 1974 Dodge P/U Long Bed Stepside 318 2019 Ram 2500 6.4, auto, 4WD
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Re: 340 T/A crank?
[Re: RapidusMaximus]
#3069213
08/18/22 01:34 PM
08/18/22 01:34 PM
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Joined: Jan 2003
Posts: 8,413 Highland, MI.
Sunroofcuda
master
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master
Joined: Jan 2003
Posts: 8,413
Highland, MI.
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I'll add to your question here since I own an AAR. Is the T/A-AAR crank a different crank than a regular 1970 340? I've never heard that the cranks were any different!
No Man With A Good Car Needs To Be Justified
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Re: 340 T/A crank?
[Re: RapidusMaximus]
#3069228
08/18/22 02:17 PM
08/18/22 02:17 PM
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Joined: Jan 2003
Posts: 26,005 Rio Linda, CA
John_Kunkel
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Posts: 26,005
Rio Linda, CA
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68-72 340 forged 2532457, 2843868 (#1 and #4 rod journal drilled through)
Parts book shows no difference for T/A.
The INTERNET, the MISinformation superhighway
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Re: 340 T/A crank?
[Re: RapidusMaximus]
#3069273
08/18/22 04:01 PM
08/18/22 04:01 PM
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Joined: Jan 2010
Posts: 1,442 NW Chicago suburban area
Mopar Mitch
pro stock
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pro stock
Joined: Jan 2010
Posts: 1,442
NW Chicago suburban area
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The radius ends look really questionable... T/A and AAR factory cranks were just standard 340 forged cranks.
Race-305 T/A cranks are another story.
Last edited by Mopar Mitch; 08/18/22 04:01 PM.
Mopar Mitch
"Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers!
Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!
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Re: 340 T/A crank?
[Re: moparx]
#3069347
08/18/22 08:05 PM
08/18/22 08:05 PM
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Joined: Aug 2003
Posts: 43,315 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,315
Bend,OR USA
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in that year, i thought the 318 and 340 cranks were the same ? i have been wrong eleventybillion times in my life, so one more time being wrong wouldn't be a surprise............... I have heard that the 340 cranks have bigger counterweights for the heavier bigger bore 340 pistons, not the same as 318 I have seen 318 cranks used in 340 motor with steel plates welded on the crank counterweights for increasing the weight for balancing If they both had the same casting number, I might believe there the same but when they aren't there is a reason for that BTW, I have used a 318-3 HD truck crank in a 340 race motor with really light SS pistons, that worked really well
Last edited by Cab_Burge; 08/18/22 08:08 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 340 T/A crank?
[Re: fastmark]
#3069496
08/19/22 11:08 AM
08/19/22 11:08 AM
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Joined: Jun 2003
Posts: 2,412 Weatherford, Texas
RapidusMaximus
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OP
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Weatherford, Texas
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I’ve got lots of 340s apart. I can’t say that I have ever looked for the number on the forging on a 340. I've got a real TA motor apart right now and can look for a number. There is no difference in the part number, as stated several times, in all forged 340 cranks. All 340 cranks had the rod journal end drilled to remove weight for balancing. All 273 and 318-3 steel cranks did not have the journal drilled. It is solid. Therefore it changes the balance. 273 and 318-3 used the same steel crank. The 273 used a very thick wall piston pin to make the balance work for the same crank. My understanding is that all the counter weight throws were the same on all 273-340 steel cranks. Sadly, that crank looks rusted beyond use. It’s not a special crank. Yeah, it’s already 10/10, I have some other parts to take to the machine shop, I’m going to carry this thing with me see if it’s savable. The journals are still smooth…maybe??? It will clean up…maybe
1968 Plymouth GTX 1974 Dodge P/U Long Bed Stepside 318 2019 Ram 2500 6.4, auto, 4WD
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Re: 340 T/A crank?
[Re: RapidusMaximus]
#3069506
08/19/22 11:28 AM
08/19/22 11:28 AM
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Joined: May 2007
Posts: 701 Northern California
lilcuda
super stock
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super stock
Joined: May 2007
Posts: 701
Northern California
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Guys, the simple way to tell is to look at the front and rear crank throws. 340s have a hole bored in the end throws to make it possible to balance it with the heavier 340 rods. This crank appears to have the front throw bored, so it's a a pretty good assumption that the rear is as well. Also, I believe all forged 340 cranks were shot peened, so if you look closely at the radii of the journals, you can sometimes see it. I do not know for sure if 318 truck cranks are shot peened. Actually, now that I think about it, I wonder if the 318 trucks had the heavier 340/360 rods as well? Quite frankly, unless you must have absolutely every part be the correct casting/forging #, I'm not sure it matters. If it is a forged, shot peened crank that has the end throws bored and it is is in good shape, run it.
'67 is an abbreviation of 1967 67' is an abbreviation of 67 feet They are not interchangeable.
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Re: 340 T/A crank?
[Re: fastmark]
#3069507
08/19/22 11:30 AM
08/19/22 11:30 AM
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Joined: May 2007
Posts: 701 Northern California
lilcuda
super stock
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super stock
Joined: May 2007
Posts: 701
Northern California
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I’ve got lots of 340s apart. I can’t say that I have ever looked for the number on the forging on a 340. I've got a real TA motor apart right now and can look for a number. There is no difference in the part number, as stated several times, in all forged 340 cranks. All 340 cranks had the rod journal end drilled to remove weight for balancing. All 273 and 318-3 steel cranks did not have the journal drilled. It is solid. Therefore it changes the balance. 273 and 318-3 used the same steel crank. The 273 used a very thick wall piston pin to make the balance work for the same crank. My understanding is that all the counter weight throws were the same on all 273-340 steel cranks. Sadly, that crank looks rusted beyond use. It’s not a special crank. I should have read your reply before I posted. You are correct.
'67 is an abbreviation of 1967 67' is an abbreviation of 67 feet They are not interchangeable.
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