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Thank you for the drawing. So I can say that my upper tube has nearly the same lenght. That helps me much. Axel

Sorry, that was a misunderstanding of mine. Old-tank supported the info about the front torque tube seal. Ok, the leak at the rear torque tube is heavy. But to explain my troubles more clearly here I go: If I fill the tranny to the full mark at the dipstick and drive the car then I have that heavy leak at the rear of the torque tube. After each driving and parking the car over the weekend I have an oil spill of about 15"x15" under the torque tubes rear. Then, after driving and driving again and heavy leaking again, the fluid level in the tranny drops over the time. Then the amount of leaking seems to go down too. So I asked myself what's the reason why. Therefore I measured the ATF volume in the tranny and find out, that I have 1.5 - 2 qts to much ATF in the tranny. The manual says, that there has to be ca. 10.5 qts oil in the tranny including the converter. I have ca. 12 - 12.5 qts ATF in the tranny, when filled to the dipsticks FULL mark. So here is something wrong, isn't it? So before I make the time consuming work in regards of removing the rear axle and driveshaft to inspect the front driveshaft seal and seal ring bushing at the driveshaft (like old-tanks hint), I want to figure out the right ATF level in the tranny. Nevertheless I will drive the car with the correct amount of 10 - 10.5 qts ATF in the tranny (fluid level then at the "I" of the dipstick => see pics above). So I can check out, If the fluid level could has something to do with the amount of leaking. So please, if there is someone out there with a 1956 Dynaflow Buick, could you measur the lenght og the upper transmission oil filler tube. Thanks, Axel

Ok Bob, thanks for infos. I think I have to find someone with a 56 Buick to measure the upper tube lenght for me. By the way, do you think that it is possible that to much oil in the tranny (1.5 - 2 qts) will leak behind or trough the front driveshaft seal / front torque tube seal? Or will it only leak when the front torque tube seal is defect like JohnD1956 said. Axel

Hello to all, thanks for the replies and sorry for the delay, but I am from Germany and we have a different time zone here. Ok, the tranny# is P179. I think it is the original transmission. My upper filler tube tength is 15.55". The upper tube contacts the lower oil pan tube directly. The upper tube looks like original, the holding clamps too. But may be it is to long!? The manual says that there has to be an oil volume of ca. 10.5 qts including the converter. The tranny has an actual an oil volume of ca. 10.2 qts. You can see the oil level at the attached pics. The level is measured at "NEUTRAL", engine/tranny warm The oil level (NEUTRAL, warm, 10.2 qts) at the dipstick is at the "I" of the ADD OIL section. What do you think? Please see the attached pics for details. Thanks, Axel

Thanks Bob, posted it in the Buick post war section. Axel

Hello, I restorded a 1956 Buick Special with Dynaflow tranny nearly a decade ago. However, since then I have some trouble with Transmission oil leaking at the rear axle. After rebuilding all torque tube seals and bushings the leaking is still there. Then I drained all oil including the converter oil and measured the oil volume in the transmission. I figured out that there was to much oil in the tranny (2 pts), although the dipstick shows the correct amount of ATF. Ok, to check it out I have to control the transmissions dipstick and the oil filler tube lenght. The oil filler tube is divided in a fixed lower tube (comes directly out oft he the transmissions oil pan) and an upper filler tube (connected via a short rubber hose with lamps to the lower filler tube). So here are my questions: 1. Could someone give me information about the length of the upper oil filler tube? 2. Could someone give me information about the lenght of the transmissions oil dipstick? My dip stick has the following number: 1174211. It looks like the dipstick shown in the original shop manual. 3. Is this the correct dipstick? 4. Any other idea how ATF traveled to the rear axle. Every help would be greatly appreciated. Regards, Axel

Hello, I restorded a 1956 Buick Special with Dynaflow tranny nearly a decade ago. However, since then I have some trouble with Transmission oil leaking at the rear axle. After rebuilding all torque tube seals and bushings the leaking is still there. Then I drained all oil including the converter oil and measured the oil volume in the transmission. I figured out that there was to much oil in the tranny (2 pts), although the dipstick shows the correct amount of ATF. Ok, to check it out I have to control the transmissions dipstick and the oil filler tube lenght. The oil filler tube is divided in a fixed lower tube (comes directly out oft he the transmissions oil pan) and an upper filler tube (connected via a short rubber hose with lamps to the lower filler tube). So here are my questions: 1. Could someone give me information about the length of the upper oil filler tube? 2. Could someone give me information about the lenght of the transmissions oil dipstick? My dip stick has the following number: 1174211. It looks like the dipstick shown in the original shop manual 3. Is this the correct dipstick? 4. Any other idea how ATF traveled to the rear axle. Every help would be greatly appreciated. Regards, Axel