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Working on my 4 speed Dart with minor humming, grumbling vibration in 4th above 2000 rpm/55 mph. Still there when in neutral gliding but reduced. Can feel roughness when pushing clutch in at that speed. It is noticed in the float zone of the throttle while cruising only and from the trans...

Recently switched over to 3.91 gears in my 8 ¼ rear behind my mild 318 and A-833 OD trans and received some vibration at speed, likely due to overspeed. The driveshaft was rebalanced and new u joints were added. It is the stock diameter driveshaft. Most of the severe vibration is gone, except...

Just upped from 3.21 to 3.91 gears in my 8.25 rear in my Duster. Running a A833 OD trans, 255/60/15 rear tires, and stock diameter driveshaft. Everything in front suspension is good and ujoints are good. Balancer is good Immediately after the gear change by a reputable rear shop, I noticed a...

Been noticing a driveline vibration in the Duster. Running a A-833 OD trans with a 8 ¼ rear with 3.21 Sure Grip. Tires are 255/60/15. At speeds above 73 mph, I feel a pulsating vibration in the driveline, much more present on deceleration. It isn’t severe by any means, but it is there. Upon...

What stall speed would you all recommend for a warm 318 Duster, used for street driving only, with 3.91 gears. I would like to keep it as economical as possible with the gears (it's all relative of course). 2200 rpm range and a 10" converter? There will be some freeway driving at speeds no...

I have noticed while sitting at idle in park or neutral occasionally, once the engine and trans is warm, I hear an odd whirring/slightly squeaky wheel sound coming from the general area of the bellhousing on my 904. It has been doing this for over a year now, or about 4000 miles. Noticed almost...

What are the thoughts on a cause of minor vibration, more like elevated harmonics between 2800-3100 rpm, either driving or in park or neutral? 318 with 904. Seem like motor mounts, flywheel, flexplate, converter? Above 3100 rpm, I don’t really seem to notice the vibration/harmonics near as much...

My Duster runs a mild 318, with a 904 running a modified stock converter, modified to roughly 2500 rpm stall speed, stock size pan. The 8 ¼ rear runs a 3.92 Spicer LSD setup. Max RPM on highway is about 3450 at 65mph occasionally on 255/60/15 rear tires. No auxillary trans cooler has ever been...

Where can I find small bolt pattern axles for an 8.25 rear?

What do you all think is the best streetable converter stall speed to use with following combination, with good response?: • 318 • XE268 cam • 8.5:1 compression • Headers • Street Demon 625 carb • 904 with Trans Go kit • FBO distributor • 3.91...

Who is still running the 7 ¼ in their A bodies behind a mild or warmer 318 or other small block? Just curious to see if I am just lucky not having a failure just yet behind the warmed 318 in my Scamp, or if my habits of not doing any neutral drops or burnouts is really helping. Looking for an 8...

Currently, I am running a Hughes 2300-2500 convertor in my 904 with a TF-2 shift kit. My rear gears are 3.23s and I run 28" tall BFGs on the rear. The motor is a .030 over 318, with reworked and ported stock heads, Comp XE268 cam, Eddie 600 carb, Performer intake, Hooker headers, full 2.5"...

Ok, it is time (money wise) to throw a new converter into my 904 in my Duster. I am running a bone stock unit behind a stock compressioned piston 318 with COmp XE268 cam and headers, 3.21 gearing in rear. It pulls hard in the upper rpms, but it a bit doggish on the low end up to 3K or so, then...

What would be a more effective boost for my situation? The motor is a 318, .477/.480 lift cam, stock compression pistons, headers, 904, stock converter, 3.21 non sure grip 8 1/4. I want to get the tires to break free a bit easier and pull a bit harder in second gear. Should I go with a 2000-2200...

I have my 8 1/4 now in my 73 Duster. I have a 8 1/4 driveshaft thats the right length, but its bent and I do not want to use it, since it is quite a bit larger in diameter for some reason. Every small block car I have had has always had about the same general diameter for the ds. I am going...

Now that I have 3.21 gearing in my new 8 1/4, would I feel a difference in performance with a slightly looser converter? It is a stock verter' right now with a 318, near stock compression, Comp XE268 cam, headers, 4 bbl. Would a stall in the range of 2200 or 2400 help performance out some more...

I just finished installing my 8 1/4 in place of the 7 1/4 in my 73 Duster. I got the 8 1/4 driveshaft that was in another 73 Duster with the rear. The problem is that it is a little larger in diameter than the 7 1/4 unit. It actually ever so slightly touches the left exhaust pipe in a 2 inch...

I am acquiring a 8.25 rear for my 73 Duster finally. I am getting the driveshaft that was in the donor car, so that should be taken care of. The new rear had 10" drums. I don't recall my size, but my car has front discs and rear drums, so maybe its a 10" setup. I will not have the ubolts...

As of late, the speedometer on my 76 slant six Valiant with a 4 speed has been acting up. I would hear ding ding like noises from the speedo and it would be bouncing all over the place occasionally. When you would come to a stop, it would usually stop on 10, 20 ,or 30 mph, not zero. Every once...

I was teaching my little brother how to check the trans fluid on my 73 Duster the other day on a 904 with about 1,000 miles on it. It was a 1/4 quart low since the engine swap(had to refill converter after reinstall), so I had him add some more. Not watching him, he put the entire quart in...

Whats the best choice of converter with a 318 with stock bottom end with XE268 cam? It will have the 2.76 gear for a while, but will be getting a 3.23 suregrip soon. It has a stock converter now. The motor is in the process of being built now. What brand of converter/ stall? 2200-2400??

I have access to a wrecked 89 Dodge Dakota with a 8 1/4 rear. How much work would need to be done to make this work in a 73 duster? Can it work? What addtional parts would I need and how much would I have to shorten the shaft to make it work? Thanks.:read2:

I am progressing towards putting a 8.75 in my 73 Duster in place of the smaller, but still strong and noiseless 7.25. I have a 489 casing. Can I use the same u-joints, or do I need different ones? I know about shortening the shaft, but how much? 2.25"? Also, im missing some wheel studs. Where...

With my 2.76 geared 7.25 and 318 4/bbl with Comp 260H cam (.440"/.440" lift),manifolds, is there a slightly better converter that will help out performance with this gear? I know I could change the gearing, but i'm curious with the current setup. I currently run a stock converter behind my Trans...

My speedo is off on my 73 Duster with warm 318. When it reads 55, I believe that it is 65, as my tach reads 2150 RPM-2200 RPM. When the speedo reads 65, its turning 2500-2600 RPM. I have used the gear ratio calculators, but seem a bit inaccurate. My 7.25 rear -supposidly- has a 2.76, as it...

Would the difference in performance be very significant or only minor a 2.76 rear gear to a 3.23? I'm thinking only a tenth or two as far as elapsed times are concerned in a small block car.

I was just curious if switching to a different converter would get a little more pep out of the combination that i already have in my 73 Duster. For those who don't know, its a 318, stock heads and bottom end with an Edelbrock 4 bbl and Performer intake, Comp 260H cam, with about .440 lift, and...

what gear oil and sure grip additive should i use in the 8 3/4 that i'm putting in my 73 Duster? Thanks.

Does Anyone Have A 8.25 Rear,complete,functional,large Or Small Bolt Pattern With Drums In California That They Are Willing To Sell?

BEING THAT I'M PLANNING TO KEEP MY 7.25 FOR A WHILE BEHIND MY MILD 318 AND 904 W/SHIFT KIT COMBO, I WOULD LIKE TO CHANGE SOMETHING. THE CAR, AS DISCUSSED BEFORE, IS BEING USED FOR CRUISING AND PERIODIC HARD ACCELERATION JAUNTS, BUT NOT DRAG DUTY. IT NEEDS TO LAST ME FOR QUITE A WHILE, SO IM...