727 transmission compatability?

[69chargeryeehaa]

Hey guys, just wondering about 727 trannys', i have a 69 charger with a 440 and 727 tranny from a 74 new yorker, my tranny is perfect, but i know when i blow it up i will not find one cheap, i have a lead on 2 727's a guy has for $150 CDN each, one is out of a challenger, one from a cuda, both are 70's and were 340 motors. He said they both worked fine when pulled about 8yrs ago, now here's my question, will they fit? bolt patterens? tourque converter/flex plate all the same? is the price good? i know they probally need rebuilt from sitting for so long but they're cheap from what i've seen. anything else i should look for when buying one of these?

thanks 

[is_it_EVER_done?]

No, the small block/big block transmissions won't interchange. Internal parts will (BB 727 - SB 727) but to buy and store one for possible internal part usage is a waste of time and money in my opinion.

If you can find a BB 727, it would probably be worthwhile to buy (cheap) if you have the room to store it, as they are getting harder and harder to find.

[69chargeryeehaa]

how do u identify a bb from a sb? #s?

[MOPARHOUND!]

IIRC, the dust cover bolt patterns are one way of telling.

The big block has 4 bolt holes for the dust cover all the same size.

The small block will have 4 bolt holes, with the outer 2 larger than the innermost 2 bolt holes.

Something like that..........will look for a side by side pic.

[Chryco Psycho]

the small block case has a bolt hole @ 12:00 position where ti bolts to the engine the big block doesn`t

[John_Kunkel]

IIRC, the dust cover bolt patterns are one way of telling.

The big block has 4 bolt holes for the dust cover all the same size.

The small block will have 4 bolt holes, with the outer 2 larger than the innermost 2 bolt holes.

I agree the dust cover bolt pattern is the easiest way to tell the BB form the SB. In the pic, BB is on the right>