Posted By: graphx
Vibrating 440 - 06/23/09 03:34 AM
I have a problem with my '69 Charger R/T, and I hope someone can help me. The car's engine has what I would describe as a fairly strong vibration. It's taken all the fun out of being able to drive the car again.
This Charger is the car I bought in November 1970 when I returned from Viet Nam, so there is no way I could adequately describe what the old car means to me. It had been tucked into a corner of my garage minus an engine and transmission for 12 years. In an effort to get the car back on the road again, I had bought a strong running 440 and 727 transmission from my son's friend several years ago. It's a rebuilt '76 440 that my son's friend had in his '67 Coronet R/T while its original engine was being rebuilt. The 727 has a shift kit and a tweaked valve body and works great.
Last fall my son and one of his friends installed the engine and trans into the Charger so we could take the car to Monster Mopar Weekend. The engine was previously rebuilt. I don't know if it was bored or not. (I don't have any specs on the rebuild.) I do know it has a set of 906 heads with double valve springs and a mild RV cam, as it was supposedly built for towing in an older Dodge Ram pickup. It has a 1970 cast iron intake manifold. While it was on the engine stand prior to installation I installed the HP exhaust manifolds that are original to my Charger. I also installed a rebuilt water pump and a '69 water pump housing. The engine uses a stock points-type distributor with a Pertronix setup. The carb is a Holley 750 double pumper with mechanical secondaries. It has a correct Saginaw power steering pump mounted using a set of Bouchillon reproduction brackets. A '69 air conditioning compressor was also installed. We used new stock (rubber) motor mount insulators and a new stock (rubber) transmission mount.
The engine had a B&M flex plate bolted to it, as it still retains a cast crankshaft and thick dampener. We installed the engine and trans into the car with a new aftermarket stall converter (approx. 3500 rpm stall) using the B&M flexplate. This same steup (minus the new aftermarket converter) worked beautifully in my son's freind's Coronet R/T; in fact, I was convinced I should buy the engine/trans because it ran so well in the Coronet without even a hint of vibration. However, after installing the same setup in my Charger and firing it up, it was obvious the engine had an unwanted vibration. Suspecting the aftermarket converter, we begged the use of a lift, pulled the transmission and swapped in a known good stock converter from a steel crank 440 a friend of mine had on his shelf. Because of the cast crank in the 440 and the now stock steel crank converter combination, we retained the B&M flexplate. All that effort for nothing, as the vibration remained, with no change whatsoever. We went ahead and took the car to Monster Mopar and had a blast, in spite of the damned vibration.
We're stumped. The engine vibrates at all rpm, both in gear and in neutral. It's a pita to borrow a lift and pull the transmission (again), but I will do what I gotta do. The engine is strong as hell, starts and runs well and the transmission chirps the rear tires on the 1-2 shift. I want to be able drive this old car again, just like I did 39 years ago, but NOT with this vibration. Any and all suggestions would certainly be appreciated. (Sorry this has been so long.) Thanks!
Steve
This Charger is the car I bought in November 1970 when I returned from Viet Nam, so there is no way I could adequately describe what the old car means to me. It had been tucked into a corner of my garage minus an engine and transmission for 12 years. In an effort to get the car back on the road again, I had bought a strong running 440 and 727 transmission from my son's friend several years ago. It's a rebuilt '76 440 that my son's friend had in his '67 Coronet R/T while its original engine was being rebuilt. The 727 has a shift kit and a tweaked valve body and works great.
Last fall my son and one of his friends installed the engine and trans into the Charger so we could take the car to Monster Mopar Weekend. The engine was previously rebuilt. I don't know if it was bored or not. (I don't have any specs on the rebuild.) I do know it has a set of 906 heads with double valve springs and a mild RV cam, as it was supposedly built for towing in an older Dodge Ram pickup. It has a 1970 cast iron intake manifold. While it was on the engine stand prior to installation I installed the HP exhaust manifolds that are original to my Charger. I also installed a rebuilt water pump and a '69 water pump housing. The engine uses a stock points-type distributor with a Pertronix setup. The carb is a Holley 750 double pumper with mechanical secondaries. It has a correct Saginaw power steering pump mounted using a set of Bouchillon reproduction brackets. A '69 air conditioning compressor was also installed. We used new stock (rubber) motor mount insulators and a new stock (rubber) transmission mount.
The engine had a B&M flex plate bolted to it, as it still retains a cast crankshaft and thick dampener. We installed the engine and trans into the car with a new aftermarket stall converter (approx. 3500 rpm stall) using the B&M flexplate. This same steup (minus the new aftermarket converter) worked beautifully in my son's freind's Coronet R/T; in fact, I was convinced I should buy the engine/trans because it ran so well in the Coronet without even a hint of vibration. However, after installing the same setup in my Charger and firing it up, it was obvious the engine had an unwanted vibration. Suspecting the aftermarket converter, we begged the use of a lift, pulled the transmission and swapped in a known good stock converter from a steel crank 440 a friend of mine had on his shelf. Because of the cast crank in the 440 and the now stock steel crank converter combination, we retained the B&M flexplate. All that effort for nothing, as the vibration remained, with no change whatsoever. We went ahead and took the car to Monster Mopar and had a blast, in spite of the damned vibration.
We're stumped. The engine vibrates at all rpm, both in gear and in neutral. It's a pita to borrow a lift and pull the transmission (again), but I will do what I gotta do. The engine is strong as hell, starts and runs well and the transmission chirps the rear tires on the 1-2 shift. I want to be able drive this old car again, just like I did 39 years ago, but NOT with this vibration. Any and all suggestions would certainly be appreciated. (Sorry this has been so long.) Thanks!
Steve