SlantSixSullivan
Well-Known Member
I am picking up a parts car for my '80 Diplomat coupe this week. It is an '89 5th Avenue.
Here's the plan:
Take the 7.25 rear out of the Diplomat, put in the 8.25 from the 5th Avenue. I do not know the ratio but I am suspecting it to be the 2.26 or 2.45. I have read that the 2.45 carrier will not accept any other ratio.
Any truth to this? I hope to one day upgrade to a more performance-type ratio.
I will have to use the transmission from the 5th Avenue as well, since I have no other option. I believe it to be the A999 variant of the A904. Again, this is not a performance piece and will likely be upgraded down the road, when time, money and availability permit.
With this transmission and rear end combo coming from a 4 door car, going into a 2 door, will my 2 door driveshaft work?
As for the engine, I have a 360 ready to drop in. I have two options here. I could use the stock torque converter from the 5th Avenue, which has a 318. In this case I would need a 360 flex plate from B&M for balancing purposes. Or, more preferably, I could just go with a better stall converter for a 360.
Am I correct in assuming the above?
Finally, the carburetor is a thermoquad. I have heard that the lockdown linkage may need modified. What modifications, if any, are necessary?
This is the first drivetrain swap I've ever done by myself, hence the questions. Thanks in advance.
Note: When I am done robbing the 5th of what I need, I will sell it whole for parts, or parts individually. Just let me know what you need.
Here's the plan:
Take the 7.25 rear out of the Diplomat, put in the 8.25 from the 5th Avenue. I do not know the ratio but I am suspecting it to be the 2.26 or 2.45. I have read that the 2.45 carrier will not accept any other ratio.
Any truth to this? I hope to one day upgrade to a more performance-type ratio.
I will have to use the transmission from the 5th Avenue as well, since I have no other option. I believe it to be the A999 variant of the A904. Again, this is not a performance piece and will likely be upgraded down the road, when time, money and availability permit.
With this transmission and rear end combo coming from a 4 door car, going into a 2 door, will my 2 door driveshaft work?
As for the engine, I have a 360 ready to drop in. I have two options here. I could use the stock torque converter from the 5th Avenue, which has a 318. In this case I would need a 360 flex plate from B&M for balancing purposes. Or, more preferably, I could just go with a better stall converter for a 360.
Am I correct in assuming the above?
Finally, the carburetor is a thermoquad. I have heard that the lockdown linkage may need modified. What modifications, if any, are necessary?
This is the first drivetrain swap I've ever done by myself, hence the questions. Thanks in advance.
Note: When I am done robbing the 5th of what I need, I will sell it whole for parts, or parts individually. Just let me know what you need.