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I have been thinking about ways to lower my '60 foot time in my Duster. I was considering headers but have been thinking maybe a bigger improvment would be a custom converter from Ultimate or PTC. I searched the forums and Ultimate seems to have a lot of feedback. Would this be something...

I have been meaning to check my trans fluid. Is there a way to determine the fluid level while the engine/trans is cold? everything is always scolding hot once I get back from a drive. I know it should be in neutral but I was thinking there would be a way to determine the level when sitting cold...

I think something is wrong with my transmission. It's the original 904 but with around 10,000 miles since it was rebuilt. This only happens when its been sitting for a while. I would say at least a week without moving. Yesterday for example I went to drive it. When I shifted into reverse The car...

Lately I have been having a strange noise coming from the back of the car. I noticed this about a month ago. Although when I first heard it, it was the first time I drove the car with the windows up. With them down it's almost impossibile to hear. So this may have been going on all summer...

I noticed a few drips of trans fluid hanging off the speedometer cable for my 904. Is this a common place for fluid to leak? Beneath the cable on the floor was a small spot of fluid from sitting and I assume dripping every so often after a drive. The cable is wet around the area where it goes...

I'm trying to determine if I need a new speedometer cable. The rear end in my Duster has been upgraded to a 3.21 gear. Afterwards I replaced the pinion with the correct one (32 tooth) When driving down the highway my odometer is almost 10% off when the needle is around 70mph. I remember when I...

Next week im getting my pinion seal replaced by a reputable mechanic. I have an 8 1/4. Last summer new gears and a limited slip were installed complete with new parts. Ever since then the rear end has been leaking. Not much though but enough to notice. It's not the cover however but up near the...

There was an earlier thread about 904's and 727's and a "reverse manual valve-body" was mentioned. I didn't want to hi-jack the thread, so anyway, what are those and what is their purpose? I have a 904 in my car that dosn't have a manual valve body but I still shift it manualy at times. Just...

What would be a good overall torque converter for my mild 318? 340 cam, 4-barrel, rebuilt 904, 3.21 sure-grip. Right now it has a stock converter. What stall are these rated at?I was thinking about getting one with a 2,200-2,500rpm stall. I think that would work out good, but does anyone make...

Has anyone used a steel shim gasket for their transmission pan? I purchased one cheap at a swap meet last weekened. In a couple days i'll be changing the pan on my 904 auto. It's much thicker than the gasket that came with my new pan. The guy I bought it from said "not" to use black rtv sealant...

I am about to do a transmission fluid/filter change. In the process I am adding a mopar performance +1 quart trans pan. I was planning on running regular B&M trick shift transmission fluid. Is this fluid okay to run in a 904 auto? Thanks

I determined through year ones chart I need a 32-tooth speedometer gear. However, they raised there prices to $70. I ofund this used one on ebay...

I have a leak coming from my rear-end. My first thought was the cover, but everything is dry. Seems to be coming up around the u-joint/yoke area. It's a minor leak but im worried it will worsen. I had new gears installed over the summer with a new installation kit (seals, bearings, etc)...

Anyone know the torque specs of the rear end bolts for a 1974 8 1/4? Also I may use sealer for the cover instead of a gasket since it started linking after the gears were installed. It even lists in my chiltons that no gasket was used after 1972. Anyone have a recommendation for sealer? Do I...

I just recently had new gears installed in my 8 1/4 and the cover keeps on leaking. He put a new gasket on that came with the kit, but the chiltons manual I have states that after 1972 they didn't use a gasket for the cover. It's a 1974 duster. The leak keeps getting worse and all the bolts are...

I am about to order a new speedometer gear but not sure which one I need. I looked at year one's chart. http://www.yearone.com/pco/A_0308/full.asp?page=246 I just got a 3.21 ring and pinion installed and according to the chart I would need a 32 tooth gear. My current tire size is...

Hello - I have a quick question involving the rear end gears found in the 8 1/4. I have a 1974 Duster, factory 318 car in the shop right now awaiting 3.21 gears and a limited slip. I still have to call the mechanic to see if he has started on it yet. My question is how common was the 2.76 gear...

I've got some questions regarding the 8 1/4 under my duster. I recently purchased a set of 3.21 gears and a limited slip for it. I called a local shop that does rear end work to get an estimate for the labor if I supplied the parts. He said I may need to buy more parts. He isn't sure whats...

How much would you pay for a stock flexplate?? I found that advance auto parts sells stock flexplates that require the 5/16 bolts for only $15. Im just not sure if it's a quality part or not. Seems very cheap to me, considering when summit sells the one I need for over $60. I beleive the one...

I determined that the noise coming from my transmission is more than likely my flexplate which is the stock one. I found a crack in it when I took the dust cover off. But my question involves the bolts. I can't remember what size the 6 bolts are that go into the back of the block. I beleive they...

Got a question but don't know it it's really a concern. Ever since my rebuilt 318 has been back in my Duster I have noticed a slight humming/whinning sound at low crusing speeds. It's only while my foot is steady on the gas pedal but goes away immediatley when I let off. I always thought it...

I have a 8 1/4 in my 1974 Duster. It is the original 2.76 open. I have decided I want to go with a 3.23 sure-grip. Not a 3.55, or 3.90. I feel these will be the most comftorable. My question is how much of a difference be performance wise over my 2.76 open. My 318 and transmission have been...

I have a 904 Torqueflight in my Duster and wanted to know if anyone had an idea of what rpm is best to shift manually. If I take off at a stop in "1" then i'll shift it into "2" shortly after then into "drive" which is "3". Does anyone know when exactly I should shift would be most effective...

Will a 727 pan fit a 904 transmission. I know they are basically the same, except the 727 being a little larger. I ask becasue my pan has been leaking fluid. The transmission has been rebuilt and still leaks, at first we thought it was coming from the dipstick but its dry. It has been seeping...