I've got no doubt the 4L80 is a good trans. It's based on the TH400 which is also excellent as a rugged non-lockup and non OD trans). My 87 diesel 3/4 ton Suburban had over 500K when the 6.2 engine blew to pieces and the TH400 was still fine. Even wore out the rear-axles splines twice, but the trans kept on going - and still is. My son took the Suburban to Colorado, put in a used 6.2 along with a turbo, and still drives it on hunting trips to Wyoming with 33" tires stuck on it.
I've also got an 83 Blazer diesel plow truck with a TH400 - along with a mechanical-modulator. Also been great.
The thing is with this mini-motorhome is . . . I baby it. No towing or beating on it . . . but there's no getting around the fact that it weighs 7000 lbs. and I climb a lot of hills at 60 MPH. If I felt confident that I could build a 700R4 to stand up to that use for 100K I'd do it. I'm already sure the 4L80 and TH400(3L80) can, . . . but it's a lot more money, including the controller, throttle-position sensor I'd have to rig up, etc. So, I'm researching a bit. If I had to tow anything, I'd never consider the 700R4.
Also, if there was a torque converter available for the TH400 with less slippage loss at crusing speed, I might try that also. As I recall, there is a 15% loss all the time, which I'd like to dimenish or eliminate.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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