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New Motive 3.73 Gears for 742 Case, part # C887373E, on sale at Summit Racing right now for $230, normally $250. I am asking $150 plus shipping (estimating $20-$30 depending on where you live). Was going to rebuild my 742 case again and decided to just buy a brand new 489 case fully loaded.

A member just paid for this thing, it is sold.

It is an OEM Suregrip. My dad lives in the Woodlands and I visit a couple times of year. Don't have any plans to go any time soon, but if I do head south I can reach out to you and try to set something up if no one has bought it by then. I will see what I can do, but I am more selling this as...

They are from Dr. Diff. Not sure what brand he sells. Ended up buying a complete third member from him, great guy and very helpful. My new third member is working great. I have about a 50% success ratio on building rear ends with quiet gears. Ran out of patience and didn’t want to try again.

I have a 742 case 8.75 rear end center section with 3.55 gears and a sure grip. Only has 200 miles on new gear set, new bearings, and full rebuild. I spent two days rebuilding this with all the right tools, perfect pinion preload, perfect contact pattern, perfect backlash, and the gears started...

I want to share my 8 year long saga trying to solve a driveline vibration issue. I finally fixed it last night and want to share so others who are as frustrated as I was can learn from my mistakes. 1968 Dodge Coronet 440 w. A-833 Overdrive 4-speed 8-3/4 rear end, 742 case, 4.10 Suregrip Stock...

This project didn't die on the table, but a lot happened and the car is nothing like I had intended in my earlier posts. I'll tell the story as concise as possible: About 20 months ago my job moved to a different city a couple hundred miles south and I choose to stay put. I was worried it would...

I know this is an old thread but I finally got this last problem solved, the problem where the car would spit and sputter under a heavy load, pretty much anywhere in the secondaries. I grabbed an old MSD 6AL ignition off my uncles wall the other day, and I mean fairly vintage. It is probably...

Mike Gaines, it's not a street car. And please don't take this the wrong way, I really do appreciate you sharing your setup and how it acts at the track. It will definitely help me figure out my overheat issue. But, it's got a 3 speed with 4.88 gears, a spool, 3,500 stall, manual valve body, no...

Dakota Digital is telling me I need an MSD tach adapter, part # 8920. Seems pretty silly to take the digital MSD tach output, use the adapter to change it back to analog, then the Dakota Digital changes it back to a digital signal to display on the gauge and digital readout. Guess I'll order the...

It had around 70,000 miles on it, bearings and rings are factory. The cam swap was the only internal work done to the motor. That's one of the reasons why I advertised the low compression numbers. So I don't think a fresh build running hot is the case here. I've been doing some reading, and I...

I definitely had the timing numbers posted wrong, I went back and corrected. 16 initial, 36 total, so 20 degrees built into the distributor. And you say loose the thermostat completely. Worth a shot. And is 4,000 cfm really necessary? I don't think I can buy a fan combo with that much air flow...

I feel pretty dumb right now. I turned the rev limiter down to around 4,200 rpm, and setup one of the digital displays on the dakota digital to read the engine rpm, and made a quick pull. As soon as the digital readout hit 4,200 rpm, the rev limiter kicked in and power fell flat, and I got the...

All the "shiny" expensive parts easily swap to a 500 cubic inch stroker motor. The cam was laying around and took an extra 2 hours to throw in while the motor was out. There was tons of suspension work, frame connectors, cage, dash modifications, small block to big block swap, fuel system...

New water pump (electric), no fan clutch as they are electric fans, thermostat was new but gutted to remove the valve, hoses are the plastic corrugated style that do not collapse. Motor was flushed, but I doubt the freeze plugs were removed. I bet there is still some build in the cylinders, but...

That made me laugh! Definitely not just running to 7/11, it is street legal with wipers horn and turn signals, but will spend most of its time on the track with the current drive-train. I would rather spend the time and money on the next motor, but this one has to live until the new motor is...

Mike67, I had the wrong cam and specs listed in the first post, which have been updated to: Mopar purple 509 camshaft, 248 248 @.050", .509 .509 lift w/ 1.5 rocker, 108 lsa, 2,600 to 6,000 rpm operating range. The cam card is long gone, but it looks like Mopar Performance P3690933 is...

I remember programming the dakota digital tach response speed at the fastest refresh setting after seeing how bouncy the tach is, but it didn't seem to help at all. I may call them and ask how to get a better tach signal. RT K_line is correct, there was no head work done at all, stock valve...

Need some help with this fresh build, having some trouble getting it all dialed in. Here is a list of pertinent info to help diagnose: 1968 Coronet Wagon 1978 low mileage 440 from a motor home, average of 110 psi compression cold Mopar purple 509 camshaft, 248 248 @.050", .509 .509 lift w/ 1.5...