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This is a short video of how I adjust my overdrive and lockup automatic shift points with adjustable pressure switches. Those relays on the firewall are what actually handles the electrical load. The adjustable switches tell the relays to close and ground the solenoids to make the shift.

I found something interesting and possibly very useful for those with the OE 8.25 rear end. A friend gave me an 8.25 open rear as payback for building and installing a 8.75 for his big block Dart. The rear he gave me is an OE 73-74 year which matches my 73 Dart. (Not that I care about year...

2 number 15718 fuel safety cut off switches from NX Express. (one for OD and one for lockup) Cheaper at Summit under part number NEX15718. 1 number A74439A 6-20lb adjustable vacuum switch for kicking out OD and or lockup under load. These NX pressure switches are advertised as adjustable from...

The next and last piece for my 8.25 swap. All I can seem to find is 27 and 29 spline 7290 yokes for the 8.25 The swap is pretty much all done and even test driven but I had to temporarily use the conversion joint because out of 3 rear ends I don't have that 7290 yoke for the 1973 8.25 10 spline...

I have both, but the 2:91 are in the assembled sure grip rear end and ready to go. The 3:55 are in like new condition, but I would have to buy new pinion bearings and a new seal. (about 50 bucks) and set the rear end all back up again. The rear end is an original 1974 8.25 with a Jeep Cherokee...

I guess in a way that's ok, because it gives me something to do that I really enjoy. Put all new wheels and tires on the Dart and have a shudder type vibration starting at about 80 miles an hour, and getting more pronounced as the speed increases. I recently twisted my driveshaft in half and...

I built the 8.75 Sure Grip for a buddy in trade for his A body 8.25 Sure Grip that I took out of his car. Both are ready to go except for the little brackets to hold where the flex lines meet the hard line. Got those delivered yesterday, and will be putting them on later today. A body 8.75...

Built a buddy's rear axle for him to go in his Dart and it's almost done. Just need to add a couple of line brackets but now I don't want to let go of it. Going in a 74 Dart 440/727 2.91 Sure Grip 741 case. Dr. Diff heavy duty axle shafts in 4.5 bolt pattern and long studs. 13 inch disc with...

Taking the 8.25 A body rear end out and adding a Limited Slip carrier section to go in my Dart. The car in the pic is getting an 8.75 Sure Grip My right arm is jacked up from doing all new flooring in the house, so I am using mostly my left arm for all this. (impact damage to my elbow from...

I know what you are thinking, but check this out. Early last week I stepped on it and twisted the diriveshaft off at a stop light, so I get the car taken home on a flatbed and make a call to the local machine/driveshaft shop. The next day I have a brand new 7290 U joint shaft guaranteed to...

A local buddy came up with a used GV overdrive for his 71 Swinger and I offered to help him with it since he had never done much of anything gear train wise before. We split the hump under the drivers seat and welded in a section to make a taller hump to clear the overdrive unit, re designed his...

I have been looking at all the possibilities on a rear end swap for some time now, and one of our local guy's gave me an 8.25 with nice condition 3:55 gears. The 3:55's would be about perfect for my car with the 42RH overdrive. Another one of our group says he has a 8.25 clutch style Sure Grip...

@fishy68 One of our members (ktcnn94) Karl is doing his trans and has a couple of issue's I can't remember enough about to be sure. He has a 904 with a questionable valve body that might have already been modified. I suggested he just put in back in and see how it acts before doing anything...

I mentioned in a post awhile back that I was dealing with a Hurst Promatic II shifter cable being burned by header tubes and how annoying it was that they only make the 5 foot cable for that shifter. The OE Hurst cable had to travel all the way up the side of the block and then turn and come...

Hurst's 5 foot cable would probably be fine for something like a swamp buggy where the shifter is 3-4 feet above the trans, but it sure sux to figure out how to run all the extra cable in an A body. On top of that, the 5 foot snake is the one and only choice for the Promatic series shifters. I...

And it STILL sometimes takes me by surprise when it shifts again after third.:D You know, that "What the? oh yea it's supposed to do that now" when you change something?

Don't know if this has ever been posted or not, but this chart tells you what size speedometer gear is needed for different rear gears and tire sizes. Thought some might do what I do and save stuff like this.

So I wanted a stage II Transgo shift kit for a 42RH OD with the modified separator plates, new design manual valve and optional (manual 1st at any speed) valve, so out of curiosity I stopped by the local Trans shop and asked about one. Well I should have known (and did) that if they had to go...

All the electrics and plumbing is done on the 42RH automatic and well, it's automatic. At normal like you need to get somewhere, but not haul *** driving. 1-2 shift at about 25 2-3 about 40-45 3-4 overdrive at 55mph 4-lockup 65 mph And all back down like it should without touching anything and...

I have 2 adjustable normally open pressure switches plumbed to the governor port on a 42RH trans, a relay for each of those circuits, an adjustable normally closed vacuum switch and 2 manual switches to make or break the activation grounds inside the car for each relay. One of the pressure...

No other way to explain it. Needed 4 inches off my driveline so I used an angle grinder to cut away the weld and separate the yoke from the tube. Then I cut the line shorter with a metal cutting wheeled chop saw and smoothed out the surfaces and cleaned up the area for the new weld to...

Putting an A500 OD in my Dart and did a ton of research on how to make 4th(OD) and converter lockup work like I want them to. The A500OD uses an electric solenoid to apply 4th(OD) and another to apply the torque converter clutch. I tried to order a kit at about 85 bucks made just for this, but...

Then put it up and take it out, and hoping it only takes a few times before it can go in and stay in. It'a A500 OD fit mod and install day. See ya. :D

I am going to be putting an A500 Trans in my car and am going to use the A500 driveline and shorten it. But for the time being I need to retain the 7.25 rear end until I can get around to swapping it out for an 8.25. Do I have this right that I need Napa part number 347 or TRW 20226 to go from...

I'm sure if I pull it the cause will be obvious and I'm fairly sure I know what it is, but lets take some guesses based on symptoms just for fun. Rolling down the road in 3rd (any speed) and I have a noise that sounds like a wheel bearing going bad. (kind of a muffled clattery roar) like a dry...

The way I normally drive I like to keep the throttle light and the RPM's up a bit, without being into the secondaries all the time if I needed a little more power, so thought I would give the part throttle kickdown kit a try. Been running it for a couple of months now and I love it. Now the...

UPDATE Ok, done deal on the part throttle kickdown but I obviously have some more to do. I have a small spring holding the TP rod back about 1/4 inch until it gets to about 3/4 of wide open then the spring lets the throttle open the rest of the way after the TP rod is already all the way...

Looking for an online source for this, as I am not quite ready for it anyway. I want the rubber coated steel core reusable gasket. Thanks Thanks all, I got it covered. 69Mope was kind enough to hook me up.

It's a Hummer wannabe Jeep with a 9 3/4 Dana and factory disc brakes and would be a great upgrade for my Dart. Think he'd miss it? :D

Well, it's not really a trans leak per se. It comes out of my speedometer cable behind the dash:D This is caused by having a good seal of the cable to gear housing, but a bad seal around the speedo gear so fluid works it's way up the drive cable housing. It doesn't drip yet while driving, but...