Swapping Dynaflop for 700R4

[jonnycash1]

Ok Buick gods- I've decided to lose the Dynaflow in our 55' Super & go to the 700R4 & Chevrolet rear end - open driveline arrangement. The stock Buick differential measures approx. 54-1/2" from backing plate to backing plate. Does anyone know what Chevrolet models / years are the choice for this swap? I looked at a diff from a 66' Impala & it measured about 58"- too wide. I know this has been done a million times & figured I ask instead of hunt & measure 200 rear ends before finding the right one.


As always- thanks in advance guys! Jon.

 

[richard.cerritos]

I'd like to know the answer to this question as well, as I'd like to do the same to my 55 roadmaster.

 

[Airy Cat]

Try using a rear end out of a 1963 - 1965 Buick Riviera. I've seen it done before and you still keep your 5 on 5" wheel patern.

 

[eddie1948]

48 buick rear end

hey Im also on the quest for that answer mine is a 48 super 2 door sedanette what is the length drum to drum I dont think backing plate to backing plate matters at least thats what a expert told me my friend is giving me a 72 nova rear end I havent meared that yet:waving:

 

[Jim Carmichael]

1962 and later Buicks used an open driveline and the center section will bolt into the 1955 Buick housing. You will need to re-cut the splines for the axles but it makes it easy to change over as the only modification is to build or install a 4 link system.

 

[Jim Carmichael]

No but I have seen several threads that mention the width on these forums.

 

[eddie1948]

48 super

jim did u mean changing out the third member would it work on the 48 rear end

 

[Jim Carmichael]

I'm not sure about the 48 but a 1955 will accept the 62 third member as it bolts right into the housing.

 

[eddie1948]

rear end

jim thanx for the reply, what model and up to what year this info is going to be very helpful for every one

 

[bebop138]

I did the pumpkin swap on my 57 and was able to use my old axels:thumbsup::thumbsup::thumbsup:

 

[black57buick]

57 two door hard top

Bebop, what did you swap out(put in place of what you removed) on your 57 rear end? I still have an all stock 57 Buick but may change over to something differant someday and would like to get all the info I can before I start making the switch, thanks in advance for any info you have...