Bluebell7727 Posted November 21, 2015 Report Share Posted November 21, 2015 Im the owner of a 1950 coronet, I'm wanting to swap a 47 dodge 3spd top loader trans in place of the gyromatic transmission, can this be done,if so what will be need to do this swap. Any information will be greatly appreciated Quote Link to comment Share on other sites More sharing options...
greg g Posted November 21, 2015 Report Share Posted November 21, 2015 Explain top loader. Is this aa truck trans that shifts through a floor shifter? If so that unit is unsynchronized. Quote Link to comment Share on other sites More sharing options...
Young Ed Posted November 21, 2015 Report Share Posted November 21, 2015 Explain top loader. Is this aa truck trans that shifts through a floor shifter? If so that unit is unsynchronized. Not true. The truck 3spds are synchro in 2-3 just like a car. Its the 4 speeds that aren't until later in the 50s. I think it would be a lot easier however to swap in a pre 39 car trans though. Quote Link to comment Share on other sites More sharing options...
greg g Posted November 21, 2015 Report Share Posted November 21, 2015 The one truck I drove that had a three speed needed double clutching on both up and down shift. perhaps it was a faulty unit. Or maybe it was a 4 speed and I just used 2nd third and fourth, knowing 1st was unnecessary for an unloaded truck. Quote Link to comment Share on other sites More sharing options...
Bluebell7727 Posted November 21, 2015 Author Report Share Posted November 21, 2015 The 3spd is out of a dodge panel,the stick shift is on top of the trans.im looking for info on what all is needed to do this swap.. bell housing,pilot bushing,ect? Quote Link to comment Share on other sites More sharing options...
Bluebell7727 Posted November 21, 2015 Author Report Share Posted November 21, 2015 Sorry 47 dodge panel Quote Link to comment Share on other sites More sharing options...
Don Coatney Posted November 21, 2015 Report Share Posted November 21, 2015 You did not indicate your Coronet is fluid drive but I assume it is. With fluid drive you will need to find a longer transmission input shaft for the swap and that may not be possible. Is there a problem with your gyromatic transmission? Quote Link to comment Share on other sites More sharing options...
Bluebell7727 Posted November 21, 2015 Author Report Share Posted November 21, 2015 Gyromatic is gone,if I have everything from the 47, will it bolt up? Quote Link to comment Share on other sites More sharing options...
Don Coatney Posted November 21, 2015 Report Share Posted November 21, 2015 As I said transmission input shaft may be an issue with the fluid drive. Quote Link to comment Share on other sites More sharing options...
Bluebell7727 Posted November 21, 2015 Author Report Share Posted November 21, 2015 K, I dont have any part of the original transmission, bell housing,torque converter, ect.. I appreciate your patience and maybe im not understanding what your saying about the fluid drive part .. Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted November 21, 2015 Report Share Posted November 21, 2015 usually in the transformation FD to stock style from another car is the cross member that is part of the frame...it is but one item to address..some have made extensions for the mounts...then you have the linkage itself to fit to the new position of the tranny in reference to the stock shifter...again..nothing that is not how one would say hard..but makes it less than a bolt in Quote Link to comment Share on other sites More sharing options...
Don Coatney Posted November 21, 2015 Report Share Posted November 21, 2015 There is no torque converter in the factory setup. There is a fluid drive assembly and a transmission, two different things. Do you have a bell housing and flywheel/clutch assembly with your potential replacement transmission? As Tim mentioned the frame cross member most likely will need to be relocated. Quote Link to comment Share on other sites More sharing options...
greg g Posted November 21, 2015 Report Share Posted November 21, 2015 The fluid drive unit (go to all par and search fluid drive) was deeper leading to a longer bellhousing, there by needing a longer input shaft. If the truck had fluid drive (some of them did) then things would match up except that the truck bellhousing bolts to the frame and carries the brake and clutch linkage. Not so the car, as mentioned above the car bell mounts to the cross member. Do you have your flywheel? Quote Link to comment Share on other sites More sharing options...
Bluebell7727 Posted November 21, 2015 Author Report Share Posted November 21, 2015 Well guess im ,going to have to do some reading on the fluid drive, and the difference between the the transmissions as far as what can be changed or swapped out for the other.. thank you for your time and if u have anything else on this subject I would be appreciative for any info Quote Link to comment Share on other sites More sharing options...
Bluebell7727 Posted November 21, 2015 Author Report Share Posted November 21, 2015 Yes still have the fly wheel Quote Link to comment Share on other sites More sharing options...
Bluebell7727 Posted November 21, 2015 Author Report Share Posted November 21, 2015 Oh so does the truck bell mounts on the sides are in a different location compared to the fluid drive,can I add new mounts on the frame to make the trans fit up to the 230 Quote Link to comment Share on other sites More sharing options...
Bluebell7727 Posted November 21, 2015 Author Report Share Posted November 21, 2015 Yes I have the complete tran from the donor vehicle, this sounds like i need to get in there and get to work on it and see what I will have to fab up ,lol Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted November 21, 2015 Report Share Posted November 21, 2015 a factory repair book would be a world of help to you right now...if you have one...read it a couple times and get familiar..if you do not have one, you should really consider the purchase..you will need it for tons of other things as all this is going to interact with many other components of the car and again, you should have an understanding of this interrelationship... Quote Link to comment Share on other sites More sharing options...
William Davey Posted November 21, 2015 Report Share Posted November 21, 2015 Don't forget that the Gyromatic had anti-stall solenoids on the carburetor that gave a little squirt of fuel between shifts so the engine would not stall. You'll have to disable that solenoid or else the carb will dump extra fuel into the engine until your muffler explodes in a giant fireball of extra fuel. As an young-dumb 18 year old I swapped the gyromatic for a 3 speed (from a dodge pickup I think) on my 1950 DeSoto and neglected the wires. After the muffler blew it took about 10 minutes for my hearing to return and my heart rate to get back to normal. Quote Link to comment Share on other sites More sharing options...
Young Ed Posted November 22, 2015 Report Share Posted November 22, 2015 The fluid drive trucks came out after the 39-47s. The truck bellhousing will bolt to the flathead fine but is very different in how it mounts in the vehicle. Mounting the truck trans to a car bellhousing is also an issue even if you get a non fluid drive housing. Quote Link to comment Share on other sites More sharing options...
Bluebell7727 Posted November 22, 2015 Author Report Share Posted November 22, 2015 Well I've found a gyromatic over in Arkansas,im headed over there in the morning, hopefully I can purchase it and and take my coroner back to stock.... I think it will be easier to do than trying to do a truck trans swap...oh im also ordering a shop manual for my car ...thank you guys for all your insight Quote Link to comment Share on other sites More sharing options...
Bluebell7727 Posted November 22, 2015 Author Report Share Posted November 22, 2015 Well I've found a gyromatic over in Arkansas,im headed over there in the morning, hopefully I can purchase it and and take my coronet back to stock.... I think ift will be easier to do than trying to do a truck trans swap...oh im also ordering a shop manual for my car ...thank you guys for all your insight Quote Link to comment Share on other sites More sharing options...
Dodgeb4ya Posted November 22, 2015 Report Share Posted November 22, 2015 Make sure the new M-6 Gyro-Matic is exactly the same. There are 3 different extension case styles. The model # and year of car it came out of is stamped on the main case next to the shifter cover. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.