Hate to point this out Tom, (and I'm kind of apprehensive because I could be missing something) I'm thinking it was just a typo coming from a very knowledgeable authority like yourself, but the converters and bell housings would be from 57 to 63, and the crank on a Turbo Hydramatic equiped 425 (64-66 models) would be different...What year is the motor?
Your correct Marc. Thank you for pointing this out. You may have just saved 1955 a lot of trouble for nothing. Must have had an old age brain fart???? Tom T.
came out of 62 riv, I'm thinking of swaping out the the 322 in my 55 when she dies so the way to go is to replace the drive line with the the corect trans and maybe a riv rear end ? lmk what you guys think. thanks again for all the info Cheers Will
The first year of the Riv was '63. In '63, they still used the Dynaflow, however I'm not sure if it's the same as the earlier Dynaflows. In '64 they started using the ST400.
The later Dynaflow ("Twin Turbine") was an improved version of the original, but was made in a different housing. The original one, as in the '55, is a completely different animal than the 63 version. First off, there's the torque tube issue. The 63 tranny is designed for an open driveshaft. The next problem is axle width and mounting. To mount in a later axle will require some interesting suspension mods, because it was supported in the car differently from the torque tube. Once you remove the torque tube to accomodate a modern axle, then you might as well toss out the Dynaflow for something a bit more efficient. You can mount the 425 up to the original dynaflow as Tom suggested; get a bellhousing off of the later version and make it fit. I'm not sure the converter will work because the earlier dynaflow doesn't have the switch pitch option on the second turbine like the later version does. Performance wise, it would probably be a waste of time, those earlier dynaflows were so slippery all of the extra torque and horsepower the 425 would deliver would be wasted. The better option would be to find a 1957-60 Twin Turbine, and a 56-57 torque tube and axle set up. This would get you the best possible combination without having to seriously modify the car. The later torque tube would be set up to run the later Twin Turbine, (better range of axle ratios too) and the Twin Turbine would mount up to the 425. I think you'd probably find it cheaper to just rebuild the 322 when it lets go; dropping a 425 on to a slippery old Dynaflow would be a waste of time, and wouldn't get you any real change in performance, but it might get you a pretzled torque tube and a blown transmission...
1955 was the 1st. year for the switch-pitch twin turbine. This was carried through to the end in '63. Like I said, other than the trans. situation, for me it was just about a bolt-in swap. I could run you through the nec. mods, but if your not gonna do it I won't waste hours typing with one finger, I'd rather talk to you over the land line or cell. Tom T.
Tom I will give ya a call on this, I did miss speak on the year, the 425 it came out 64 riv here are some pic's I tore the motor down one of the pistons had chunk out of it . he are few pi'cs of the 425.
Now being that it is a '64/425 that's another different animal. Is the code on the front of the block a KT or KW or KX???? to identify it positively as a '64/425. I would rather talk to you from home rather than from work. Send me a PM with your number & I'll give you a shout when the time is convenient. My phone is N/C in the 48 States. Tom T.
Then it's almost definitely a '64/425. The rear of the crank is much different for a TH400 than the crank for a DynaFlow.
I seem to remember that Doc found a way to connect a THM 400 style crank to a Dynaflow - or maybe it was the other way around. You might want to send him a PM.
It's easy to convert a Dynaflow crank to work with a ST400, I did this in my '62. However, you'd have to physically enlarge (by machining) the bore of the ST400 crank to work with the Dynaflow converter.
Ok now i'm looking for a 63 crank , I have to rebuild the motor anyway so if this will mate up to a rebuild very fresh 55 dynaflow trans then sweet:TU: or Quote: <TABLE border=0 cellSpacing=0 cellPadding=6 width="100%"><TBODY><TR><TD style="BORDER-BOTTOM: 1px inset; BORDER-LEFT: 1px inset; BORDER-TOP: 1px inset; BORDER-RIGHT: 1px inset" class=alt2>Originally Posted by John Codman I seem to remember that Doc found a way to connect a THM 400 style crank to a Dynaflow - or maybe it was the other way around. You might want to send him a PM. </TD></TR></TBODY></TABLE> It's easy to convert a Dynaflow crank to work with a ST400, I did this in my '62. However, you'd have to physically enlarge (by machining) the bore of the ST400 crank to work with the Dynaflow converter. <!-- / message --><!-- sig -->__________________ Andy hummmm what to do Thanks again for the help guys Will
