Bob & Sue 110 Report post Posted August 2, 2017 Sunday we went on a cruise to a car show about 50 miles each way temperature was about 85* no engine over heating everything was fine. I'm kind of anal before parking the Mustang I always check all fluids before covering it up mainly so it's ready to go the next time. I have a C4 with B&M converter & shift kit trans fluid is cooled by an external cooler not the radiator trans fluid & filter were changed 500 miles ago. When we got home I started it to put in the garage checked the trans fluid the fluid on the dip stick was foamy could hardly read the level, yesterday I went for a quick ride to warm it up checked the fluid it was normal not low or over filled. Fluid is bright pink no signs of any coolant contamination or burnt odors. Could this just have been caused by hot weather temps? Any ideas or is this just something that happens, I've never seen this happen before. Quote Share this post Link to post Share on other sites
1969_Mach1 333 Report post Posted August 2, 2017 That is a little concerning. It's normal for some foaming of trans fluid. I've never seen is so bad you cannot read the fluid level on the dip stick. I've only seen a few bubbles at the top of the fluid level. Do you by any chance know the stall RPM of that B&M torque convertor and the RPM your engine is at when cruising down the highway? I am not a trans specialist, but I only ask because your engine cruise RPM in high gear (3rd in your case) is supposed to be higher than the stall RPM of the torque convertor. A non lock-up torque convertor like these older cars use always have some "slippage" because they are basically a hydraulic fluid coupling. But, if the torque convertor stall RPM is higher than the cruise RPM a lot of "slippage" will occur in the torque convertor, thus, overheating the fluid. If all that is okay, I'd try a different trans fluid. Be certain it's Type F. I haven't tried Lucus brand trans fluid, but I have been very happy with their engine and gear oils. Quote Share this post Link to post Share on other sites
Bob & Sue 110 Report post Posted August 2, 2017 The converter is 2400 rpm stall, cruise 60 mph @ 3000 rpm. Right now it has STP Type F pre 1981 Ford Special Formulation in it, I'm thinking of changing to B&M Type F Trick Shift in a few weeks if it continues to foam. I took it for a ride yesterday & just now no foam or bubbles on the dipstick right on the full mark. I'm beginning to think it was the heat & the STP fluid. https://www.oreillyauto.com/detail/b---m-3043/chemicals---fluids-16461/transmission-fluid-16649/trans-additive-17728/automatic-transmission-fluid/80286/2573233 https://bestautocentral.com/products/b-m-80286-synthetic-trick-shift-automatic-transmission-fluid-quart Quote Share this post Link to post Share on other sites
1969_Mach1 333 Report post Posted August 2, 2017 I'd try a different oil as well. I'm on the west coast and haven't seen anything STP in the local parts stores. I didn't know the STP brand was still around. Apparently Lucus doesn't offer a Type F trans fluid. Something like the B&M Trick shift might be a good choice. Is your external trans cooler sized large enough? I've always connected an external trans cooler in series with the trans cooler build into the radiator, if the radiator has one. You'd have to do a little research to determine the correct routing if you want to connect the radiator trans cooler in series with the external trans cooler. Quote Share this post Link to post Share on other sites
Bob & Sue 110 Report post Posted August 2, 2017 The PO hooked the trans cooler up bypassing the radiator hookup ( not sure why ) I have the lines already to route it through both which I'll do in a few days it's in the 90's right now the Mustang won't be driven till it cools down in the garage long enough to work on it. I ran the numbers on the coolers size it's more than adequate. I've never come across this problem before on any car, there's no leaks or ATF coming out of the vent tube or dipstick. The only thing I can think of PO was using Type FA which has more friction modifiers in it might be when the shop flushed it they didn't get all the FA out, they should be compatible though. Just ordered the B&M ATF should be here by Saturday. Yep STP makes a whole line of ATF's http://www.autozone.com/motor-oil-and-transmission-fluid/transmission-fluid/stp-1-qt-type-f-transmission-fluid/811756_0_0 http://www.autozone.com/motor-oil-and-transmission-fluid/transmission-fluid?filterByKeyWord=stp+transmission&fromString=search&isIgnoreVehicle=false Quote Share this post Link to post Share on other sites
1969_Mach1 333 Report post Posted August 3, 2017 I don't like hot temps either. We're still waiting for the temps to drop down to the 90's. Still 100 deg F at 6:20 P.M. and I'm only one mountain range from the coast. I cannot imagine how high the CA central valley temps are. Let us know what happens with the trans fluid. Quote Share this post Link to post Share on other sites
stangnet33 88 Report post Posted August 3, 2017 Fluid not over full ? The dip stick shows the correct level ? Common symptom of an over full automatic. Just a thought Quote Share this post Link to post Share on other sites
Bob & Sue 110 Report post Posted August 5, 2017 Yesterday I spoke to B&M CS & an engineer about the foaming I had. My setup is a C4 with a B&M 2400 stall converter, B&M Deep Finned Pan and B&M shift kit running STP Type F special formula for pre 1981 Fords. They believe because of other folks having the same problem with foaming with the deep pan that the pickup that was included in this kit might be at the wrong depth. Their advise was to drain out enough trans fluid to get the level just above the fill line if I was going to drive it in hot temps before the new pump extension arrives. They are sending new gaskets, filter and pump tube at no charge. Also changing the fluid to B&M Trick Shift Type F. Customer Service was great this kit is over 2 years old installed by the PO. Here's the pan I have https://www.summitracing.com/parts/bmm-50281/overview/ Quote Share this post Link to post Share on other sites
Bob & Sue 110 Report post Posted October 7, 2017 Changed the pump tube, filter & gasket everything looked good no gunk in the bottom of pan. Filled it up with B&M Trick Shift Synthetic no more foaming. It appears B&M has discontinued the synthetic nobody has it in stock anymore. Went to a few places AZ, Oreilly & NAPA to pick up some other parts took a look all they had was 1 or 2 qts of the original looked online B&M doesn't show it anymore. Hope it was worth the extra cost. Quote Share this post Link to post Share on other sites
69ShelbyGT350H 61 Report post Posted October 7, 2017 59 minutes ago, Bob & Sue said: Changed the pump tube, filter & gasket everything looked good no gunk in the bottom of pan. Filled it up with B&M Trick Shift Synthetic no more foaming. It appears B&M has discontinued the synthetic nobody has it in stock anymore. Went to a few places AZ, Oreilly & NAPA to pick up some other parts took a look all they had was 1 or 2 qts of the original looked online B&M doesn't show it anymore. Hope it was worth the extra cost. Within the last 2 years, I have rebuilt my FMX trans. I recently started looking for the B&M Synthetic Trick Shift. I could buy 1 quart from Amazon, one quart from PepBoys, etc, but it does not look like I could purchase the eleven quarts I'm going to need to fill the Trans and converter. B&M is no longer listing their Synthetic fluid on their WEB page either. So, I just bought a case of the regular Trickshift. Wonder why they stopped selling the Synthetic? Quote Share this post Link to post Share on other sites
