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I am helping a friend with his 8 3/4. He has lost a cap from the center section. How likely will another diner cap work on his case? What I have heard is it is better to start with a new case. I know there are aftermarket caps available so it can be done. Cost of new caps may steer him to...

Last time I installed a shorter differential I bent my own lines and flared them. if you don’t want to bend and flare your own the if you can find sections of line with pre installed fittings at the auto parts store that are a little long you can put a few slight bends in the length so they...

The Doctor Diff replacement axles in 5 x 4.5 bolt pattern come with provisions for both press in and screw in studs. When you order them he will ask you which of the two stud types you want installed when they are shipped. Later down the road you can simply install the other type if you wish...

If you are using the factory shifter they are not ideal for manually shifting. If going with an aftermarket manual shift valve body buy an aftermarket shifter if you do not have one already. You will not miss any gears.

Get a SFI approved B&M flex plate. Choose the internal or external balance that works for your engine and trans combination. The 727 for external balance engine is part # 10235 for example.

I am replacing the yoke on my 489 case 8 3/4 center section. I will change the seal at the same time. Once I remove the yoke nut and remove the yoke, given I need to re-torque the pinion nut after the swap, am I going to have an issue with the crush sleeve that is currently installed if it is...

For converters, I have had good luck by contacting companies that specialize in converters. There are several good reputable companies like turbo action, Dynamic, Coan, ... that can give you a good recommendation or custom build one for you based on your drivetrain and car specs as well as your...

Great. No need for the friction additive either.

I have used turbo action converters. Excellent results. They will ask a lot of questions about your car, head flow, cam specs, trans gears, ... The more factual information you provide to a converter company the better they can help meet your goals.

There is a thread on this site, likely in this same section by Rusty Rat Rod with pictures on how to rebuild a cone sure grip. Posted a few months back. Have a look using the lsearch function.

I am in the process of narrowing a C Body 8 3/4. I have a few choices in housing ends the shop is offering me. For those of you that have modified your differential housings with new ends or purchased a new differential, have you used the Mopar ends with green axle bearings or have you chosen...

I did not find a search result on this so here is the question. How strong are the stock A Body 8 3/4 axles when equipped with longer studs? This is for a street car small block 4 speed stroker application and will not be using slicks or sticky rear tires. Just trying to prioritize where the...

Any disadvantage of using a 985 case like more weight, strength, ...? I have heard these are older models of the 742 case. I have not seen many of these. Thanks

75w90

You will need to determine where the fluid is leaking from first. By parking on a level hard and clean surface you can see what area of the transmission, transmission lines or radiator is leaking from. It would also help to clean these areas first with engine shampoo, hose off and let dry...

I assume you have an 8 3/4 rear. Why not pick up a 3.91 pumpkin and try it. If it works you know you will be close with the new wheel/tire combo later on. You can then sell the 3.91 pumpkin to help finance the new wheels. If the 3.91 center does not work for you sell it.

I have heard of truck Dana's called Dana 60 HD which is suppose to have larger diameter axle tubes and case ribbing. Is it best to use the HD or standard Dana 60? If the HD has larger axle tubes the install would require mods on the perches and shock plates as well as larger U bolts. Thanks

I have a bare 8 3/4 housing that needs the studs for the axles as well as the studs to hold the pumpkin. What are the specifications of the studs I need and where can I purchase them? Do these just press in or should I apply any product to the ends to avoid leaks for the pumpkin studs? Thanks

Thanks for the comments. I am familiar with the locker's reputation but do not know much about the Powertrax. Is it a strong enough unit for 600 foot pounds of torque with slicks?

I have access to both a Richmond Powertrax and Detroit Locker differential assembly for my 8 3/4 small block powered stroker. For solid street/strip performance which system can handle the most abuse? I have not seen any information on either the Powertrax or the Detroit Locker on how much...

I will follow the shop manual when reassembling the sure grip. If I need to align the splines then as you suggest I will need to rig something up to do it properly.

The center is a 741. I will likely disassemble the unit, rebuild the limited slip unit with new clutches, clean and paint the housing and have a local shop to the reassembly and final adjustments. This is why I was wondering if I needed to record the measurments before I tore it down. I will...

A couple questions before I tear into the 8 3/4 myself. The factory service manual suggests measuring side pay and runout before taking the center section apart. For those of you in the know is this necessary? Any special tools needed to take the center section apart? I have the basic...

Just wondering if you would recommend using conventional oil to break in a rebuild differential center section before switching to synthetic. I will most likely use the old gears and just new bearings in the center and axles. I was planning on using the synthetic right away given these are not...

When rebuilding your 8 3/4 center sections has anyone bothered to change the clutch packs in their clutch style posi units? I am rebuilding my 8 3/4 so now would be the time to do it. I did not get a chance to drive my project before starting my restoration so I cannot give any feedback on...

Good ideas guys. Thanks I will give these a try.

Anyone have a trick on how to remove the inner axle seals in the axle tube of an 8 3/4 without a special tool? Thanks

Which synthetic oil did you have in there?

Which axle bearings are people running? I have heard that some people are having issues with the green bearings. I will be rebuilding my stock 8 3/4 axles. Any experience out there? I need to order new bearings and want to select the ones that will give me the least problems. Any advice...

I took my 8 3/4 rear apart and noticed the bearings were shot and the metal retaining ring holding the bearing in place was worn and also scratched the housing tube as well. Does the axle bearing and metal retaining ring ride on replacable inserts? If yes how are they removed? If not can the...