Sure they did. I have two 1991 diesel Suburbans sitting here. Both with factory 4L60s. They came from the local school so I know they are original. Besides, it's also listed on the RPO stickers as MD8.
I have the Chevrolet factory service manuals sitting here in front of me.
"1991 Unit Repair Manual Light Duty Truck # ST 333-91." Printed June 1990, General Motors Corporation,Warren, MI. Page 4l60-1 shows "RPO MD8" as "4L60" trans.
"1991 Chevrolet Trucks R/V/P/Models Service Manual", # ST 330-91, General Motors, June, 1990. Page 0A-8. 6.2 diesel with 4L60 Hyra-matic ID. Describes how to decode the "1LFM157A" on the side of the trans-case. Decodes to . . 1 for 1991, LF for model LF, M for 4L60, 157 for built on the 157th day of the year, and A for first shift of workers built it.
I just stripped one and took the drivetrain out. Note the "MD8."
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Today's Featured Article - Recollections of a John Deere GP - by Charlie Cook. I grew up on my dad's 280 acre general farm in Western Michigan. Dad's only tractor when I was very young was the old GP. My first recollection of this tractor was when dad allowed my brother and myself to ride on the tractor with him driving. One of us would sit on the left fender (away from the clutch) and other would sit on the gas tank and hold onto the crankcase breather pipe.
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