Had a couple issues with my truck I needed to address. I had never touched the 700R as it came out of a friends truck and he told me it was fine. For the first 2 months or so it was ok, then it started slipping slightly in 4 and going in and out of 3rd. Bought a new trans from Monster Transmissions in FL and put it in this Sat. While I was at it, the 6.2 started to have a small leak from the rear main. So while the trans was off, the new oil pan came off and a new seal went in.
The new trans came with a deep chrome pan, new stock stall 6 bolt diesel converter, 12qts of synthetic, and a new remote cooler. All this and a 3yr warranty for $1,623.00 delivered. The local trans shop wanted at least $1,500 to rebuild mine w/6month warranty. No converter, no fluid, no remote cooler. It was a no-brainer.
Total job to get both done took me 9hrs. My brother and a buddy helped out and my buddy who painted the truck let me use his lift. That was a life saver. Test drove the truck after all was said and done with the TV adjusted and I found it really moved out quickly but shifted late even on a light throttle. After reading threads on the TV cable I took a second look at the adjustment which was done by the book. Turns out the bracket that holds the cable was flexing enough at WOT that it wouldn't pull the casing out even one click. I ended up pulling the cable by hand until the casing came out one click. I then opened to WOT and the bracket didn't flex nor was there any slack in the TV cable. Took it for a test drive and the shifting is now perfect.
Total job ended up being a success. No leaks, new trans cooler, perfect shifting trans, and now the truck really moves out. Turns out the original trans was swallowing motor output. After a closer look I believe I found the issue with the other trans. The torque converter was only a 3 bolt. This trans and converter did come out of a original 87' 6.2 Jimmy but I know he had it rebuilt at one time. It appears they put in the wrong converter as a diesel converter should be a six bolt converter and no greater than 1650 stall. (when I installed the trans in my truck I guess I wasn't paying attention to the converter either

When I dropped the pan on the old 700R there was no debris and the fluid smelled perfect. I believe the converter was to blame for my issues.