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 - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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