albolton Posted April 7, 2011 Report Share Posted April 7, 2011 Ok i know there are some rodders on here, i need some schooling I am putting a 360 in my 54, and need help with converter and flex plate, the 360 is externally balanced, i have bought a 727 and converter from a guy that claims they where behind a 340 ( I say "claims" because i am learning not to trust a thing most guys selling performance parts say )..how can i tell the difference, can i run this 340 converter with my 360?, do i need to buy an aftermarket balanced flex plate?, any help would be appreciated Al Quote Link to comment Share on other sites More sharing options...
olddodgeguy Posted April 7, 2011 Report Share Posted April 7, 2011 340's are internally balanced generally. Can't think of any that weren't but the memory isn't what it used to be!! I would use an aftermarket flex plate, or better yet, a complete 360 set up. Less problems in the long run. Sounds like a good engine swap. My 350 BB Mopar is really a chore going in but it's going to be fun!! Or at least I keep telling myself that. Good luck. Mike Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted April 7, 2011 Report Share Posted April 7, 2011 on the 360 the flex plate is available weighted I think for about 80.00 check with Summit Racing...OR for the cheaper fix, the Mopar Performance folks used to list the weight and chart for location/installation for about 15.00 to attach to the TC itself..a bit of search on the internet will land you what you looking for real quick...some of these link will get yo to the proper forum for the answer no membership necessary..the 360 is a bit different from the other LA engines it is assocaiated with and even the lower end is different in that the oil pan is common on to itself..when looking to install a 360 in a application such as yours..look to the truck oil pan and the cneter dump exhaust manifolds..the truck pil pan is often time fitted wtih the dipstick on the pan itself and offers 6 qt lubrication...if your engine is used and from a donor...and the donor was a standard transmission..be wise to check your crank end play prior to install..the thrust bearings take a bit of a hit over time.. Quote Link to comment Share on other sites More sharing options...
Dave72dt Posted April 7, 2011 Report Share Posted April 7, 2011 It'd be wise to check the end play on automatics also. I've found as much or more thrust wear on those as on standards. Torque converters can ballon up and apply constant thrust pressure. Quote Link to comment Share on other sites More sharing options...
51 Fargo Posted April 7, 2011 Report Share Posted April 7, 2011 (edited) this will make it easier for you ...A 360 converter has a flat steel plate welded to the front of the converter where the 4 bolts go to the flex plate. this is the balance weight if there is NO plate welded to the converter it is not for a 360. it will be for a 340 .318.273 . So if it is not there just order a converter for a 360. I run into this all the time swapping motors and trans Edited April 8, 2011 by 51 Fargo Quote Link to comment Share on other sites More sharing options...
albolton Posted April 7, 2011 Author Report Share Posted April 7, 2011 thanks for the help guys, the engine is at the machine shop now, so the bottom end will be fresh, as for the pan, i am running the fatman IFS setup, so I am tied to a rear sump pan Quote Link to comment Share on other sites More sharing options...
wayfarer Posted April 11, 2011 Report Share Posted April 11, 2011 340's are internally balanced generally. Can't think of any that weren't but the memory isn't what it used to be!! I would use an aftermarket flex plate, or better yet, a complete 360 set up. Less problems in the long run. Sounds like a good engine swap. My 350 BB Mopar is really a chore going in but it's going to be fun!! Or at least I keep telling myself that. Good luck. Mike 1968 through 1971 internally balanced. 1972 -1973 are externally balanced. Quote Link to comment Share on other sites More sharing options...
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