Going to go with a sure grip

[Derek Simpson]

Hey Guys

Over the winter I'm going to start collecting all the parts I need to do a full disk conversion. I know with the rear the axles need to be pulled. So I figure while I there might as well change out all the seals and try and locate a sure grip rearend to install. I have a 66 Newport with a 383..

My question is what will I need to get and does anyone know where I might be able to snag a used one?


Thank you
Derek

 

[detmatt]

I find used ones on Craigslist and have them gone through by a pro.

 

[Derek Simpson]

I've been looking. What's a good price for a used one?

 

[BigFury]

$300-$800 depending on the pig number. Ive scored deals cheaper on a few occasions but find the best one you can and, like Dematt said, spend the cash and have it freshened up.

 

[jstaples2]

This is on my list of to-do's as well. Is it possible to buy and install a sure-grip core into an open rear-end? I have a 742 case with 2.76 gears now. I'd like to put in a sure-grip and 3.23 gearing. I've yet to find a book or resource on how to build/swap an open rear-end for a sure-grip. Is it a more advanced level build?

Something like this - Mopar 8 3/4" (8.75) Clutch Type Sure-Grip ("Powr-lok") ?

 

[Derek Simpson]

I still have to look at what I got for gearing. I'm hoping just to do a core drop in as well. I hope someone can chime in

 

[The Horvaths]

Just swap the center section. Check your casting number and make sure to buy the right one.

 

[The Horvaths]

This is on my list of to-do's as well. Is it possible to buy and install a sure-grip core into an open rear-end? I have a 742 case with 2.76 gears now. I'd like to put in a sure-grip and 3.23 gearing. I've yet to find a book or resource on how to build/swap an open rear-end for a sure-grip. Is it a more advanced level build?

Something like this - Mopar 8 3/4" (8.75) Clutch Type Sure-Grip ("Powr-lok") ?

I believe Hotrod magazine has an online article on this.
Here it is:
How (and Why) to Change Center Sections in a Mopar 8-3/4 Rearend

 

[BigFury]

I just swapped out my '741 single track with a '742 SG.. All the 8 3/4 pigs interchange, (in the housing). Its not that complicated, took 2 hours. Some guys can do it alot faster

 

[65sporty]

Swapping the whole center section is easy. Replacing the gears, changing out the open for a sure grip and changing the bearings requires some skill. You also need a dial indicator to check backlash. You may want to leave that to a pro.

 

[saylor]

anyone have a parts list for this?

I'm tryin to get santa claus to bring me a new pumpkin and muffler bearings and whatever and she don't know anything about mopars

but she knows how to order from summit

thanks !

- saylor

 

[70bigblockdodge]

Changing a sure grip for a open using the gear set you all ready have is not too bad. Changing the gear set requires a bit of skill, special tools, and some experience with someone who knows is invaluable.

 

[moper]

If it were me, and you have some time anyway, I'd just upgrade to the Tru Trac differential and a better gearset. Then all you ned to do is find a usable case and pretty much any case will do. You spend a bit of money because someone thinks their 40yr old beaten Sure Grip is worth gold. Start with a case and build it new. Or, give Cass Eslick (Dr Diff online) a call and have him do one for you.
I loved my Newport 383 with a set of 3.55s in it.

 

[Derek Simpson]

If it were me, and you have some time anyway, I'd just upgrade to the Tru Trac differential and a better gearset. Then all you ned to do is find a usable case and pretty much any case will do. You spend a bit of money because someone thinks their 40yr old beaten Sure Grip is worth gold. Start with a case and build it new. Or, give Cass Eslick (Dr Diff online) a call and have him do one for you.
I loved my Newport 383 with a set of 3.55s in it.

I really might have to look into that. Might be the better way to go. About how much did that setup cost?

 

[twostick]

Just be careful if you find a 489 case that it doesn't have a cone type SG in it.

489 case good. Cone type SG not good. Clutch type is the one you want and it will fit all cases. 741, 742 and 489.

Also the gears are case specific.

741 is considered inferior to the rest which is mostly BS but they are cheaper because of that perception. Ratios are limited as far as new gears are concerned tho.

Dr Diff is your go to guy for all things drive train and brakes.

Kevin

 

[moper]

Depending on your sourcing the parts with a ratio of your choice (some ratios are only available in certain cases, BTW) will run around $1000, the case whatever you can find, and the labor $3-400. New axle bearings would be a good idea to get it 100%. They're probably another $150-$200 to get and have them pressed on. Be aware that the yoke may also need to change with your new gear choice, and running the Tru Trac requires the use of the Green axle bearings to do away with the tapered bearing endplay adjustment. That's why I say Cass is a great help. Or a solid choice to order a complete center section ready to install.