Soon2BNewbie wrote:
But YES I am very concerned about the engine & trans. I haven't read about anyone in this forum having the 360 V8, & that worries me that there's a lack of longevity with this engine. And I have NO idea if I could afford AND adjust, rework, rewire & re-adapt the rig to drop a 440 in it. I'll see what the mechanic says. ~Meghan
Most of your concerns are baseless. I'll start in the rear and work forward ...
The rear axle in the motorhome you're considering is most likely a Dana/Spicer Model 70, generally called a Dana 70. It's possible, but much less likely, it might have a Dana/Spicer Model 60 (i.e., Dana 60). Both are very robust and durable.
The Dana 70 is really a medium-duty truck axle and, as such, is a bit of an overkill in all but the heaviest motorhomes. Dana 70 rear axles are very hard to damage and just about impossible to destroy. I have three in my yard that all original and in like-new operational condition. They're all dirty and greasy but can be cleaned up to original appearance and condition with little effort, in spite of all three being around 45 years old.
The Dana 60 is also very durable although slightly less robust. It is perfectly suitable for light-duty trucks, including Class C motorhomes. It was also used in high performance automobiles and, especially, "muscle" cars. The quality of the Dana 60 is demonstrated by the fact they were used as OEM equipment by a wide range of manufacturers, including the "Big Three" -- General Motors, Ford, and Mopar (Dodge, Fargo, Chrysler, Imperial, and Plymouth.)
The Dana 60 was, and still is, extremely popular among hotrodders and racecar builders, which makes it difficult to find used ones. My daughter, for example, is considering a Dana 60 as a possible replacement for the somewhat problematic stock first generation 8-3/4 rear axle in her '59 Plymouth Savoy restomod project, to handle the built-up 383 big block she's planning to put in it.
My '66 Dodge Polara, with a 383 engine, had an OEM Dana 60 and I used that car to tow a 1-1/2 ton step van 180 miles across the bottom end of Minnesota, without any difficulty. Likewise, my '49 International Metro had an OEM Dana 60 and I used it to tow a stranded, fully loaded 18-wheeler 20 miles to a truckstop.
The heavier weight of the Dana 70 tended to rule them out for use in hotrods and racecars. (Although, they are popular among extreme off-roaders and rock-climbers.) This, combined with their widespread use and durability, makes it much easier to find good used ones. Any rarity is due to many being sent off to be melted down by recyclers, due some people viewing them as being out=dated. (Please excuse me for a moment while I mourn, again, the many good, perfectly usable products that have been sent off to be melted down and remanufactured into new, generally crappy, products.)
The transmission in the motorhome you're considering is most assuredly a TorqueFlite/LoadFlite A727. (99.9999% probability) The A727 is my absolute favorite transmission, by a very wide margin, among both automatic and manual transmissions. The Ford C6 is a distant second and only tops the list when used with a Ford engine. (Don't get me started on the Ford E4OD! I've rebuilt an E4OD twice and, while it is a reasonable transmission, it's a royal PITA to rebuild. On the other hand, I'd rebuild a A727 just for the fun of it.)
I've owned quite a few A727s and stressed many of them by:
-- 100+ mph over extended distances
-- Dropping them into second gear at 80+ mph (to avoid a ticket)
-- Towing a variety of often heavy trailers on extended trips
-- Going across rugged, steep mountain passes, sometimes towing trailers
-- Stripping the tread off tires, down to the cords, by spinning and smoking 'em
In spite of my abuse, I've never managed to damage an A727 or even cause any unusual wear and tear. In reality, my "abuse" has not come any where near testing the limits of an A727 transmission. As with the Dana 60, the A727 is popular among racecar builders because they can handle the RPMs, torque, and horsepower of race engines, including the ones used in top fuel dragsters. (The A727 has been connected to engines that put out as much as ten times the horsepower of production engines, with very little internal modifications.)
In my opinion, shared by many, many otherpeople, the A727 is an example of a product that is as near to perfect as humanly possible. First offered in 1962, the A727 continued in wide-spread use well into the 90s with very little changes. It has been used in all but the lightest automobiles as well as light- and medium-duty trucks. (I have not been able to determine the heaviest medium-duty truck application but would not be surprised to find an A727 in a 5-ton truck.)
Throughout its production span, there have been very few external differences. There are, for the most part, a separate version for small block and large block engines, with the difference consisting of the bell housing bolt pattern used to connect the transmission to each family of engines. (i.e., a big block A727 cannot be used with a small block engine and vice versa.) Of less concern to most people there were different versions for push-button and lever-shift controls. (This means you'd have to also replace the transmission if you want to go from a 360 small block to a 440 big block.)
Internally, there is a wide range of variations, based on the transmission intended application. The standard A727 is called a TorqueFlite and the heavier duty version is called a LoadFlite but there actually isn't a lot of differences between these. (I could turn a TorqueFlite version into a LoadFlite by judiciously swapping some parts.) One major variation is standard versus lock-up torque converter.
The front, three-speed part of Chrysler's overdrive transmission, the A518, is essentially an A727 and many internal parts in this section are interchangeable between an A727 and A518. (This is important to those of us with older A727s because we can buy new parts to replace damaged parts, rare as that need might be.)
Fundamentally, Chrysler created the A518 by adding an overdrive gear-set to the output end of the A727. Unfortunately, the engineering of the add-on overdrive is nowhere near the engineering and manufacturing quality of the original A727. Furthermore, there is a known significant problem with the clutch material in early lock-up torque converters.
I would not, under any circumstances, consider replacing an A727 with a stock A518. The only way I'd consider it is with an aftermarket torque converter and essentially a complete replacement of the internal overdrive components. In my opinion, the advantages of a lock-up torque converter are marginal. Likewise, an easier, and arguably better, approach to overdrive capability is to connect a Gear Vendors Over/Underdrive unit to an A727. (I would recommend replacing an A518 with an older A727, assuming you wouldn't run into problems with the vehicle's computer ... newer vehicles have too many inter-related subsystems and violate a sound systems design principle.)
BTW - Almost everybody is under the false impression that automatic transmissions are extremely complex and difficult to rebuild. This impression is the only reason automatic transmission rebuilders get away with charging outrageous prices for their services. Personally, I view these inflated prices to be a scam approaching the level of a felony.
I successfully rebuilt the A727 in my '66 Dodge Polara around 40 years ago, before I learned how difficult the task was supposed to be. Since then, I rebuilt quite a few automatic transmissions and, based on my experience, I'd say that automatic transmissions are easier to rebuild than engines and manual transmissions, which I've also rebuilt.
I usually pay to have engines rebuilt by professionals, mostly to make use of their much greater experience. I rebuild automatic transmissions myself because I refuse to pay outrageous prices for what I view as a relatively simple, although time consuming, task.
There's two main reasons people believe the myth about automatic transmissions:
(1) How an automatic transmission works is somewhat mysterious. The internal operation of an engine or manual transmission is relatively easy to see and understand. As with vehicle electrical systems, the actual operation of the hydraulic system in automatic transmission cannot be seen. Both of these systems require quite a bit of effort (and a bit of faith) to understand. Unlike electrical systems, malfunction is almost always due to contaminates plugging up the system. (Torque converters tend to be especially baffling in terms of understanding how one part can transfer rotational force to another part without actually touching the other part.)
(2) Automatic transmissions contain lots of similar parts that can cause problems if they're not in the right place. In particular, the hydraulic valve body that controls the transmission operation contains many springs and check balls with barely discernible differences.
Unlike engines, most automatic transmission rebuilds serve mostly to just refresh the transmission, with internal cleaning and replacement of clutches, bands, and seals. I've never encountered the need for any machine work and most internal parts simply never wear out.
Just about every problem with an A727 can be traced to plugged filters, old fluid, insufficient fluid level, and/or overheating. Vehicles with automatic transmissions have a separate fluid cooler built into the radiator. ((Nowadays, most replacement radiators come with the internal tranny fluid cooler, which is simply left capped off when the radiator is used in a vehicle with a manual transmission.) Unless you spend a lot of time idling at a standstill in temperatures over 90 degrees, overheating shouldn't be a problem.
Simply put, it's reasonable to expect an A727 to outlast multiple engines, several vehicles, and a long string of owners. If I live long enough, I wouldn't be surprised to encounter an A727 that's still working just fine after several million miles. Based on what I've seen, an A727 could last a couple of hundred years, assuming regular fluid and filter changes, an occasional "rebuilds" to replace aging seals and worn clutches and bands, and replacement of a few worn-out torque converters.
This is enough for now. In my next post, I'll try to dispel your notions regarding the 360 engine.
Oh, yeah ... for those who have been following my ramblings, I do plan to get back to vehicle electrical systems, resuming where I left off with SLI versus deep cycle batteries.
1970 Explorer Class A on a 1969 Dodge M300 chassis with 318 cu. in. (split year)
1972 Executive Class A on a Dodge M375 chassis with 413 cu. in.
1973 Explorer Class A on a Dodge RM350 (R4) chassis with 318 engine & tranny from 1970 Explorer Class A