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I'm putting a rear end together 8 3/4 741 case. Are the yokes interchangeable between 741, 742, 489. I know that there are fine and coarse spline pinions and small and large U-joint yokes, but will two yokes of the same spline interchange if the source rear end case is not known. I have a few...

In cleaning out the remnants of a deceased friend's garage, I came across a pair of axles that I can't ID. I don't want to scrap them, but can't figure out what they go to. They are clearly for an 8 3/4 rear and still have bearings with one side adjuster in place, BUT THEY ARE 5 1/2 INCH BOLT...

1970 A-body, late 70s 318 (internally balanced), A500 4 speed overdrive automatic (42RH), lock up converter, 8 3/4 rear. both overdrive and lock up are actuated with a manual buttons, The driveshaft was recently balanced and driveshaft angles corrected. Out on the open road in third gear (1:1)...

I put an RH42 behind the 318 in a new Dart project (1970). I wanted to keep control of the OD and Lock-up as simple as possible to start with. I ran all three wires from the trans to a box on my console and installed 2 switches from New Wire Marine (Rocker Switch Pros) in the box. I ran the...

I installed an RH42 (A500) OD 4 speed automatic in my 1970 Dart. It took some work and fabrication, but nothing terrible. Problem is that these transmissions have a lot of stuff hanging out of the bottom of the trans where a regular valve body would be and then cover it up with a really deep...

I put a 42 RH trans in my Dart. The factory pan is really deep to contain the additional stuff for the 4 speed overdrive. The plug in the pan sticks out of the bottom of the pan and I finally snagged it on something. It is the lowest thing under my car, just below the exhaust pipes. Does...

I have a cyclic vibration in a totally new drivetrain that I would usually associate with a problem in driveshaft angles. If I put the car on a lift and adjust things so that the transmission pan rail is flat, the angle of the 8 3/4 rear chunk as measured at the mounting pads for the pinion...

A while ago I bought an RH42 (A500) 4 speed torqueflite from a member here ( great transaction with no issues). He took it out of a street strip car he was building after not many miles when he decided to go with a manual trans. The trans came with a fresh 2800 stall lock up converter. The car...

So I've been getting a new Dart on the road and have run into what seems to be a transmission issue. The engine is a newly built mildly modified 318 and the trans is an A500 4 speed automatic (based on the 904). I havent even hooked up the electrically triggered overdrive or lock-up converter...

I'm just about finished installing a freshly rebuilt 42RH (A500) in my 70 Dart. I put part of a quart in the torque converter when the trans went in and then put about 5 quarts down the dipstick hole, until it came up to the full mark on the dip stick (yeah I know that mark is there for running...

I've got a nice A-body 8 3/4 housing that at some point spun an axle bearing. The area where the bearing race would sit is boogered up, bit not horribly. Is there a sleeve for this so that it could be machined and sleeved without compromising the strength?

I have been trying to help a member here with his small block kickdown linkages, which has led me to a question. On all the cars that I work on the kickdown is connected to the carb with a slotted adjustable rod. I believe that this is so that when you let off the gas quickly whatever is...

I'm installing an A500, but I think the answer for this would apply to all Torqueflites - which port in the side of the transmission pumps trans fluid to the cooler and which is the return line. I'm installing an aftermarket trans cooler and want the pressure line to go to the fitting on top...

Today I went to to install the fittings for the transmission lines in my freshly rebuilt A500 (RH42). As I tightened up the fitting the part of the case that is threaded for the fitting broke apart. Is there anything that can be done to repair this or do I just have to find a whole new case...

So as indicated I'm putting an A500 (RH42) into my 70 Dart which originally had a A904. I have a set of new lines for a 70 Dart with a 727 and it seems that the lines are bent in a way that I can use them all the way up to the K-frame. At that point I was going to transition to rubber lines to...

I have a freshly rebuilt A500 4 speed OD automatic with lock up. I'm looking for recommendations for trans fluid for a street car. The only trans kinda like this I have is a A518 in my 97 van and manual says ATF +2... This is a freshly rebuilt unit going behind a relatively mild 318. The...

Does anybody know where I can get a shallow drain plug kit for my 8 3/4 housing? Suggestions on placement?

I bought an A500 42RH from a member here and it came with USCT crossmember. Despite studying their web site and talking to folks at USCT I have not been able to find a readily available part number for the trans mount that USCT designed the crossmember to use. They give a part #...

is there a place to find out details of what type of transmission I have purchased and where it originally lived? I bought a 4 speed automatic from anther member and I have been trying to find out the exact type of transmission (I think it is a 42RH) and where it came from (year, vehicle and...

I recently purchased a 42RH (A500) for my Dart street car. I'm going to get it rebuilt and was wondering what upgrades folks had made during a rebuild that worked out well for them. I am mostly concerned about reliability and durability. It will be behind a 350hp small block. All suggestions...

I recently bought a 4 speed automatic (A500/42RH). I'd like to identify exactly what model of transmission it is and what vehicle it came from. Is there a way to do that?

I'm building a Dart for long distance travel and am considering using an electric trigger lock-up 904 with the wider spaced gears ( 2.74, 1.54, 1.00) and a lock up converter. To make things simple I was just going to install a manual switch to activate the lock up on the open road. Is anybody...

Poking around on the interweb I found these very substantial axle seals from Winters Performance.. I am hoping they would solve a long standing issue with one of my 8 3/4 housings seeping into the brakes. Please - I have inspected, tested and replaced everything in the system except the...

Looking for help with this persistent problem. On the left side of my Dart, differential fluid leaks into the brakes. I have had that axle (actually a different axle) rebuilt with all new bearings and seals and replaced the seal in the axle tube twice. It is better than it was but it still...

Below are a couple pictures. The axle had a whole new kit installed on the axle about 4,000 miles ago (bearing, seals gaskets, adjuster) all functions well but lube seems to be seeping out between the adjuster threads and the axle (see photos). I think the shop damaged the outer seal when they...

I have run into a problem that I've never seen on a torqueflite in 40 years. I installed a freshly rebuild 904 behind my small block with an A&A standard pattern valve body (which I have in 2 other cars). Car works fine in drive and delivers crisp "drive around" shifts, but when I floor it at...