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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