Thanks for the info. It all kind of makes me wonder why GM made it so complicated in the 91 diesel.
Guess I learned a few new things. One being the GM RPO codes, by themselves, don't tell the whole story - seeing how they use the same RPO code for the 700R4 and the 4L60. And yes, I realize it was basically just a name change at first, but it's still a bit confusing.
This rig has been a bit of a "slippery slope." Got it going last year, but it lacked power with the 700R4 and high gearing (3.08s). This winter, I stuck in a turbo. This year, it ran great, with power perfect for the gearing - but . . . then the trans blew. I already knew the trans wasn't really adequate, and also being an 86 - it lacks updates.
So, now I'm trying to do this right - or at least, "righter." 7000 lbs. weight on those 10 bolt axles and 15" tires also makes me a bit nervous for long-trips. So, I'm now thinking of beefing up that 4L60 to 4L65 status, and installing the 3.73 axles from my 89 3/4 ton Suburban. The rear is a 14 bolt semi-floater with more load capacity, and the 3.73s ought to make life much easier for the trans. It also means I'll have 16" tires. I like the 3.08s for fuel mileage, but I'm afraid it might be asking for trouble with an 700R4/4L60.
I've already got all these extra parts sitting up in my field, and I guess I might as well make use of them.
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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