What should I do?

Boyd

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MD, PA & NC
As many of you know, I bought a 1965 New Yorker 2 door with a 440 engine. Clearly, this is not the engine that came in the car, but it is running and is a nice rider. I have done a disk swap, upgraded the suspension, got the alternator swap working, found a transmission leak and have my Coker's with Summit wheels. I could not have done it without you guys.
The differential is clearly stock. My mechanic told me that the car is a little overpowered with out a sure grip. He is not a Mopar guy.
I have searched the forums for differential info, but it is really overwhelming. Seems that everybody wants to tell you how to build the watch.
The last time I worked on a differential, we just found some 4:11 gears at a pick and pull and did the swap. It is not 1962 any more. What should I do?
 
As many of you know, I bought a 1965 New Yorker 2 door with a 440 engine. Clearly, this is not the engine that came in the car, but it is running and is a nice rider. I have done a disk swap, upgraded the suspension, got the alternator swap working, found a transmission leak and have my Coker's with Summit wheels. I could not have done it without you guys.
The differential is clearly stock. My mechanic told me that the car is a little overpowered with out a sure grip. He is not a Mopar guy.
I have searched the forums for differential info, but it is really overwhelming. Seems that everybody wants to tell you how to build the watch.
The last time I worked on a differential, we just found some 4:11 gears at a pick and pull and did the swap. It is not 1962 any more. What should I do?

Unless you are burning thru lots of tires, leave it alone unless the unit needs rebuilding. Your car is heavy, so you should not be having much in the way of traction issues. A sure grip is an essential on the track, as a daily driver not so much so.

Dave
 
Wow, You're all over the map Boyd. How far are you from Carlisle, Pa. and then how far from Wilmington, N.C.? You need to think about a couple things my new Friend. 1st. You're playing with a 4400lb+ car and it will never be a Street Brawler without ah serious $ investment. Then looking at an open rear end or Sure Grip do you want to use up 1 tire or 2 in short order? I invested serious $ in a 1961 Chrysler T&C Long Roof a few years back that would leave twin black streaks on the pavement as long as you kept your foot in it. I swapped out the 323 sure grip for a 276 open in an attempt to save on the fuel consumption ah bit. The swap took me from 8 MPG all the way up to 8.1 MPG. WIN WIN, lol. 2nd. Their's a lot to be said for just making it look better then its age would suggest and enjoy cruising with the A/C on when it's 95* out with an equal amount of Humidity. And Bench Racing with like minded individuals that share your passion for these fine C-Bodys Their's a bunch of us on this site that have been where you are soooo? Oh yeah, their's a guy on this sight also that goes by the name of Murray Park that will be in his same 6-8 swap spaces come Chrysler's at Carlisle this coming July that you should try to search out and get to know. We refer to him as the mother provider of all things C-body. Main thing is that you enjoy being care taker of your '65 for a long ling time, Jer
 
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The other thing to consider if you live in a rural area with lots of icy roads and back country roads that are crowned. We get a lot of those conditions in rural Oregon. The sure grip tends to want to spin both rear wheels at the same speed. From a standing stop on ice that means the *** end of the car wants to follow the crown of the road toward the ditch. I took out a sure grip in a '70 440 fury for that reason and put in an open rear end. Car would stay on the road, made very little difference in fuel or traction because a big boat is not going to burn out unless you really have your foot into it all the time.

Dave
 
What do you use the car for?? city/highway cruising? stop light action?
What cam is in the 440??
How tall are your tires??
What gear ratio is in it now??
Stuff that needs to be asked to make it all work together.

I run peg leg 2.94 gears behind a potent 383 with 28 inch tall tires. I drive a lot of highway and works well.
I had 3.23 but engine revved a bit on highways.
I have a 2.76 sure grip but decided not to use it.
I figured it will not gel with the stall speed in my trans.

Sure Grips are perfect for burn outs,LOL!!
 
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My 69 SF is all original with an L code 440hp but NOT a sure grip and 3:23 gears. IMO, stick with what you got, it will be a better driver and should be plenty stout.
 
i bought a truetrak and 3.55 gears from dr diff. its next on the install to-do list as soon as this dude finishes paying me for the 383 motor i sold.

im removing a 2.76 one legger. because i put in a 440.

try not to die -

- saylor
 
Great points all. I want to drive it to shows. I have a steep driveway and it gets slick in the fall with rain and leaves. That was my concern. I had a 1965 383 Newport drop top and I loved it. I had to move up to 16 inch wheels when I did the disk swap, but, I tried to keep the tire size to stock. I don't plan to drive it in bad weather, but I thought the driveway could be an issue. I think I will save my money for the paint job. Thank you. See you at Carlisle!
 
One last concern, most current cars are equipped with some kind of limited slip. That said, shouldn't you get safer cruising on the interstate when taking the turns. I am still concerned about safety. In the current world, we have gone from one wheel drive to 2 wheel drive to all wheel drive. I don't give a damn about smoking the tires, just safety on the interstate.
 
One last concern, most current cars are equipped with some kind of limited slip. That said, shouldn't you get safer cruising on the interstate when taking the turns. I am still concerned about safety. In the current world, we have gone from one wheel drive to 2 wheel drive to all wheel drive. I don't give a damn about smoking the tires, just safety on the interstate.
Taking turns on the Interstate will not be any different with or without a Suregrip, wet or dry.
 
As many of you know, I bought a 1965 New Yorker 2 door with a 440 engine. Clearly, this is not the engine that came in the car, but it is running and is a nice rider. I have done a disk swap, upgraded the suspension, got the alternator swap working, found a transmission leak and have my Coker's with Summit wheels. I could not have done it without you guys.
The differential is clearly stock. My mechanic told me that the car is a little overpowered with out a sure grip. He is not a Mopar guy.
I have searched the forums for differential info, but it is really overwhelming. Seems that everybody wants to tell you how to build the watch.
The last time I worked on a differential, we just found some 4:11 gears at a pick and pull and did the swap. It is not 1962 any more. What should I do?
4.10 r good for drag racing but r too low for street driveing if i was u i would put in a set of 3.23 its low enough for good off the line & still get fairly decent mpg , the bigger the number (lower the gears ) the faster out of the hole but the wroce the mpgs i take it r going to drive this? then go with the diff dr sure grip set up i guess u have the 8 3/4(8.75) rear end? the gears roll out the frount of the rear ends everything else comes out the bac
 
Don't try to compare current technology with 60's/70's technology. What you have is fine and very safe for any conditions you may encounter while enjoying your ride.
Normal use.... an open diff with 2:92 gears is ideal. If you are going to tow then the 3:23's are fine. You want to race, well you need a formula for your powertrain and how you will apply it. But you will sacrifice economy and driveability.
 
Don't try to compare current technology with 60's/70's technology. What you have is fine and very safe for any conditions you may encounter while enjoying your ride.
Normal use.... an open diff with 2:92 gears is ideal. If you are going to tow then the 3:23's are fine. You want to race, well you need a formula for your powertrain and how you will apply it. But you will sacrifice economy and driveability.
i have 2.76 in mynew yorker & it pulls a 23' travel trailer just fine
 
Back in the muscle car days engineers that worked with Dad ordered sure grip thinking it was necessary in their h.p. cars. Until the *** end came around on them in the first rain shower.
In fact Mom ended up facing the wrong way on Northwestern Hwy. during rush hour with our 65 Sport Fury. The last car we had with sure grip!
 
Yep. Works for me to.
jean & her trailer all ready bto go camping! (2).jpg
jean in her towing garb (2).jpg


jeans motor .jpg


GEDC0440.JPG


hitch.jpg
 
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