Driveshaft length help?

[dkimwar]

Hello all, new to the forum, but have a question regarding driveshaft length. I have a 1966 Coronet 440 with a 440ci and a727 from a 72 Charger as well as the factory 8 3/4 rear end. What length driveshaft should I be looking for and where should I go to get it? Also, any help on finding the right engine mounts would be valuable as well. Thanks!

[markz]

Welcome to the site!

From the factory service manual, it shows that the driveshaft would be 52.28 inches. I would not think that the transmission length would change between 1966 and 1972. Either way, never trust a dimension you are given. Always measure - the vendor you buy the shaft from will give you instructions how to properly measure.

As far as vendors, I buy mine from Mark Williams. They are excellent but pricey. Others include Strange Engineering, Denny's Driveshafts along with others.

Engine mounts today are tricky. Not sure where to send you for that, but need to know more about the car before can make any recommendations. Stock? Modified? Super modified?

In my 67 Coronet street car I run the Schumaker poly mounts but they sag over time and don't think they are currently available. In my 69 GTX street/strip build with 713 hp I am going solid motor mount.

[dkimwar]

Welcome to the site!

From the factory service manual, it shows that the driveshaft would be 52.28 inches. I would not think that the transmission length would change between 1966 and 1972. Either way, never trust a dimension you are given. Always measure - the vendor you buy the shaft from will give you instructions how to properly measure.

As far as vendors, I buy mine from Mark Williams. They are excellent but pricey. Others include Strange Engineering, Denny's Driveshafts along with others.

Engine mounts today are tricky. Not sure where to send you for that, but need to know more about the car before can make any recommendations. Stock? Modified? Super modified?

In my 67 Coronet street car I run the Schumaker poly mounts but they sag over time and don't think they are currently available. In my 69 GTX street/strip build with 713 hp I am going solid motor mount.

Thanks for the reply! The car is near stock, just 0.030 over and a oem+ kind of cam. The goal is to make a comfortable cruiser that looks and sounds good, so non-solid mounts are a must. We are on a budget, but I'll look into all of your recommendations.

[markz]

So for your application I would consider https://mitymounts.com/chrysler.htm for motor mounts. Never personally used them but I have heard good things about them.

[67440Dodge]

As for driveshaft might want to google your state and driveshafts. Lots of mom and pops shops out there that will do you right.

[67440Dodge]

Welcome to the site!

From the factory service manual, it shows that the driveshaft would be 52.28 inches. I would not think that the transmission length would change between 1966 and 1972. Either way, never trust a dimension you are given. Always measure - the vendor you buy the shaft from will give you instructions how to properly measure.

As far as vendors, I buy mine from Mark Williams. They are excellent but pricey. Others include Strange Engineering, Denny's Driveshafts along with others.

Engine mounts today are tricky. Not sure where to send you for that, but need to know more about the car before can make any recommendations. Stock? Modified? Super modified?

In my 67 Coronet street car I run the Schumaker poly mounts but they sag over time and don't think they are currently available. In my 69 GTX street/strip build with 713 hp I am going solid motor mount.

Sorry for late reply, but I'm 99% sure all passenger car 727 output shafts and tailshaft housings are same length (except for the pre-slip yoke 727's). I know my 727 was out of a 71 E-body and it used the standard 66 driveshaft.

As for motor mounts, Mitymounts, I've heard they are good also. Ever thought of running rubber mounts and a torque strap from Mancini's? I run it on mine with rubber/bolted mounts and have almost zero flex in shifter handle when getting on it. https://www.manciniracing.com/66b70etost.html

[65rbdodge]

For a drive shaft, if you have the slip yoke that goes in the trans, put it all the way in and the slide it out 1 inch. Measure the distance from where the center of the Ujoint on the yoke to the center of where the Ujoint would be on the rear. This measurement can be used to make a drive shaft. Check local truck(big trucks like tractor trailers) parts suppliers, a lot of them make drive shafts. Ive had a couple shafts made or shortened at my local place for both cars and big trucks.

[67440Dodge]

For a drive shaft, if you have the slip yoke that goes in the trans, put it all the way in and the slide it out 1 inch. Measure the distance from where the center of the Ujoint on the yoke to the center of where the Ujoint would be on the rear. This measurement can be used to make a drive shaft. Check local truck(big trucks like tractor trailers) parts suppliers, a lot of them make drive shafts. Ive had a couple shafts made or shortened at my local place for both cars and big trucks.

And they are MUCH more affordable than Denny's, Dynotech or others that specialize mainly in race car shafts.. and quicker