Hi all.. I just purchased an 82 K5 with a 6.2 and a 700R4 and I hope to get some help diagnosing the trans problem it is having. Thank you to anyone who can help. According to the original owner, the 700r4 was rebuilt less than 5k ago with an upgraded pump, red alto clutches and a corvette servo. First I should say that the fluid is super clean and doesn't smell even a bit burned, and it also has an aux cooler. The fluid looks like its right out of the bottle with no visible debris at all that I am used to seeing with burned clutch packs. 1st to second gear is fine and solid, but 2nd to third is completely dead. The diesel just revs and never pulls at all in 3rd. The prior owner stated that it never slipped going 2nd to 3rd, but that it just all of a sudden quit working. When the shifter is placed in OD, the 2nd band applies again I believe (still trying to understand this fully), and its llike it is back in 2nd again, but without the engine braking that I have when the shifter is actually in 2nd. How should I diagnose this? I would just think the clutches were burned as is so common, if it weren't for the lack of mileage on the trans and perfectly clean non-burned smelling fluid. What is the best course of action here to determine the failure? I have a pressure guage that came with a BTO 700R4 that I bought a couple of years ago. Can I use it to somehow prove a clutch failure, or lack thereof? Thanks!