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I've had a 904 in my Duster for years that's worked great. A few years ago the valve body cracked and I replaced it along with doing some zero-buck shift mods thanks to some members here (everything else seemed fine when I pulled the pan). It really firmed up the shifts especially 1st-2nd and...

I know this stuff has been covered before but the other threads I found didn't exactly answer my specific questions. I bought a 3.55:1 ring and pinion from Dr. Diff along with a clutch kit for my Dana Powr-Lok diff. My Duster has been running a 1967 741-case with sure-grip and 2.94 gears. I...

This is somewhat related to another current thread but I'm willing to go a few different routes depending on the advice I get. I have a '72 D200 pickup currently with a 360 and 727 (2wd). I recently picked up a 440 core which I plan to rebuild and swap into the truck. I also picked up a big...

So I was driving my Duster home from work today and the transmission started slipping, like it would go out of gear when off the throttle then when I'd get back on it it would go back into gear. It was pretty much all freeway but once I got into my neighborhood it started slipping really badly...

The 8 3/4" in my Duster currently has 2.94 gears and a worn-out clutch-type Sure Grip diff in a 741 case. I got a 489 case with 2.76 gears and open diff which I intend to swap over the Sure Grip unit into (after new clutches) as well as a 3.55 ring and pinion. I got the full kit, gears, and SG...

I currently have 2.94 gears with 28" tires on my Duster and as you can imagine it's not great off the line. The gears in my car now are in a 741 case I was thinking of changing the ring & pinion to 3.23's and later on getting a whole center section with 4.10's or something when I hit the strip...

I recently got loaned a 489 case center section with cone-type SG and 4.10:1 gears to swap in place of my 741 case with clutch-type SG and 2.94:1 gears. After installing the new 'pig' in the axle housing I went to slide in the axle shafts and they bottom out at least an inch before the bearings...

I got my transmission (904) and torque converter from a guy for super cheap, like $150. He claimed the transmission was rebuilt and the converter is a ~2500 stall TCI unit. I've been driving the car with the new stuff for a little over a year now and while the transmission is mostly fine...

I'm about to swap in a shift-kitted 904 with a 2800-stall converter into my '70 Duster and I think I should get a transmission cooler for it, since I'm planning on driving up to the mountains and thrashing it pretty hard. What ones do you guys recommend? I'm looking to spend less if I can and...

I'm currently going through swapping the drivetrain in my '70 Duster from 318/904/7.25 to 360/904/8.25. I was planning on having the original A-904 rebuilt with lots of goodies by A-R-T Automotive in Franktown, CO but have now come to the conclusion that it's out of my budget. It was going to...

I'm looking at getting a Turbo Action forward manual valve body for the A-904 in my Duster. I know it provides firmer shifts but are they firm all the time, or only when flooring it? As in, will the shifts be super hard when I'm just cruising around town at part throttle?

Hey guys, my friend just got a 1973 Dodge B200 Sportsman van with a 360 (just has 4-bbl and dual exhaust for now, stock heads, cam, etc.). Supposedly the gears in it right now are 4.10:1, and my friend wants to try to put in some taller gears for better gas mileage/highway cruising. I looked...

I got my 318 bolted back up to the transmission in the car (bellhousing and flexplate bolts in) and I can't seem to get the inspection cover on properly. Mostly, where does the round part go? Under the oil pan, or between the oil pan and flex plate? Anybody have any tricks for getting it on...

When my '70 Duster (318/904) was running, I would always have to drive funny at slow speeds (parking lots, etc.) because if I was accelerating really slowly (NOT when accelerating at a more brisk pace), the transmission would make a "clunk" when shifting from 1st to 2nd. Browsing through my FSM...