I'm glad you know a lot about the automatic scene because my final build will be a billet transmission, and I have lots of questions lol. While there, the 125-pound chunk of cast-iron was also fitted with oversize valve seats and a set of 5,000-rpm valve springs. Then again, if the factory cooler is more restrictive than the ports themselves, that shouldn't be an issue. My wife is not thrilled to drive a lifted truck with oversized tires, though the truck handles really well, and ride and stance are at least as stable as stock, maybe better. I will be looking into what kind of cooler upgrade will give me a less restricted flow, though I'm wondering if there might be something to Jay's assertion that the cooler ports on the tranny would need to be enlarged to really make it work properly. This is the transmission that was used in both the 1st and 2nd place trucks in the Diesel Power Challenge 2014.
I geared for anticipated trailering, a conventional pull travel trailer in the 6,000 -7500 range. I'd know what really went into the rebuild. The A727 was a bulletproof transmission that held up behind 425 horsepower 426 Hemi V-8s, 440 B-blocks in Class A motorhomes, and Dodge trucks to at least 1-ton capacity. This isn't about cooling, more along the line of modifications. As a Cummins owner, I'm sure you appreciate having an engine that's worth keeping and therefore worth the upgrades on the tranny. I figured since I'm not chipped and pulling sleds that a middle of the road remanufacture would do just fine. Truck Freight Item: Allow 1-2 Weeks for delivery.
Most importantly, all transmission shafts are not covered by this Warranty on any transmission due to the capability of certain situations to cause stress-loads beyond the structural ability of the shaft. When this 3-speed platform evolved into the A580, the overdrive, electronic controls, the solenoids and governor sensitivity, the weak band struts, bands and the subassembly, shaft, converter and geartrain weaknesses became the start of a large aftermarket for upgrade parts. All of this has my sights set on a maximum trailer weight of 7500 fully loaded. That alone fixed my problem, but while you have it this far apart, might as well replace a few other things! A sticking check valve in the line to the transmission cooler radiator would cause overheating of the transmission without you knowing about it. Clutch material is also essential which is why we use Borg Warner and Raybestos clutches which has both high torque strength as well as longevity and reliability. I'm not experiencing any hard downshift to first when driving, but then again it's been really cold, so I don't know if my fluid temp is even getting high enough to create the circumstances you describe. Please see below for options.
Winter can be sub-zero F at the extremes. If I'm right about the cooler members and guests can expect an update with a how-to video in the process , then a larger volume cooler is valuable in this application. So far, so good though. It's only when the unit warms up that there is a downshift issue to first gear. At an even more basic level, I do have an interesting quirk that developed with the Sonnax upgrades to the valve body and accumulator piston. Truck Freight Item: Allow 1-2 Weeks for delivery. Another important aspect is the hard parts on the transmission.
Glad you have proper shifting when cold and warm. I was a Amsoil dealer for a few years Amsoil 'reccomends' it but its not approved. Then, this past November, my wife and I set out for our first significant over-the-road trip. Overall, I think I spent less than I would have on a custom remanufactured job, but with somewhat less in terms of parts replaced. Please plan for this when ordering. Summer is hot, it will be 104 degrees F this week. You can choose between a towing or a racing valve body.
Our controller features in-cab adjustability, so settings can be changed with the push of a button. The benefit of early lock-up is reduced transmission temperatures, quicker acceleration and better fuel economy. Moderate survival measures can, as we share, be as simple as in-chassis valve body improvements, a better strut and accumulator piston see my Sonnax upgrade article , and if removing the transmission is acceptable, at least the addition of a torque converter that will stay together. I can tell when the transmission fluid temperature opens the thermal valve at the radiator mounted cooler; this seems to coincide with the downshift to first gear becoming harsh. Mitch thought the problem could be the transmission cooler, clogged in his view. I want to make sure all anticipated parts are available before plunging into this project. What the hell would I do there without a dirt motorcycle? This never occurred before the upgrades, and we purchased the truck new.
So the thermal valve at the radiator mounted cooler does receive engine-heated fluid via the engine block cooler— even in cold weather. It's always helpful to have input from someone with a lot more knowledge and expertise. This band features a performance friction material capable of holding higher power levels. Please plan for this when ordering. For six years, this combo worked well and I only recently replaced the rotting exhaust with a 4 inch stainless from the cat back and added a new cold air intake. There is the additional transmission cooler in front of the radiator.
It is mandatory for implementation of this warranty that line pressures are tested at time of install. As I mentioned before, I have no shop space and no experience cracking open an automatic transmission. I said when I bought the Raptor that it was my intention to do some serious traveling with the bike for a year or two and then scale down again. It is a very aggressive valve body and a minimum of billet input shaft and flex plate are recommended. Not saying I'd want to go back to that, but I agree, a clutch replacement and throw-out bearings are a lot easier, and more within my realm of competence and understanding.