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Ok Long story short, is still very long: I had my NV4500 transmission go down a few weeks back, in Casper WY. took is to Thomas Crawford auto repair. I had a very good experience . But now I've got issues. History: Took about week to get one sent to the shop in Wy, from Midwest transmission in zumbrota MN which isn't far from where I live. The repair shop and I decided to upgrade to the 1 3/8th input shaft,plus all the other updates that Midwest Transmission and gear, does to these trans when rebuilding them. For the clutch, I opted for the SBDD and new hydrolics. Hoped this would work better with my towing needs. Finally , The installer put 4 qts of BG Ultra-Guard® Full Synthetic Gear Lubricant 75w-90 (sad that he charge me for 8 qts ) Developments: From the start , the transmission/ clutch acted up. The Hydraulics did not break the white tabs off the cap assembly and I noticed the tabs jutting back out when the clutch was released. The Tech said they stretched. so we removed the white cap and tabs, and inserted the hyds push rod in, and re-bolted it to the trans bell housing. Also, the truck shifted hard and notchy. and I was forced to coast . . . through several intersections while hoping I could grab a gear before I was hit. Very frustrating. Other frustrating issues and lots of noise when clutch was disengaged. (was told it was normal) Otherwise the clutch grabbed good, and did not slip on any pulls or steep hills coming home. But the intersection thing was happening to many times to be safe. Also a noticeable from the start, which i told the shop owner, And had him test drive with me. Was,.. THE HAND JIGGLING VIBRATIONS on the shifter when lightly resting my hand to check for gear roll-over vibrations while rolling. But when deceleration or letting up on the throttle in 4th around 35 mph down to 25 mph. there is vibration jiggling the shifter , this happens most noticeably when downshifting with a load or on a downgrade (hill) I also get a slight tilting of the shifter forward and backward when accelerating slighting and decelerating . But only in third and fourth. which share the same Shift rial. All this is being done with gentle speeds and easy clutch releases. ((SHOP GUY SAID IT WAS a "NORMAL SBDD CLUTCH BINDING GRABBING STUFF" cause of the middle pressure plate floating in there??) 1300 miles later the trans still shift notchy and sometimes will not go into 1st third , or reverse. Not being unaware of the GL5 type fluids, I looked into the BG Ultra-Guard® Full Synthetic Gear Lubricant product the shop put in the trans. and it was not a good choice because it is a GL5 . I then changed it to Amsoil MTG. A Gl4 and Midwest trans recommended fluid. I filled it with 6 qts. ( yes 6 qts, and no, I don't agree about heat retention in the oil with six quarts. when top loading this trans I could barely see where six qts was coming up to the gears. However 5 qts is commonly recommended. I may drop a quart if the temps look high. (Three and 3/4th quarts to the hole is not enough. and that is well establish as a failure point in these transmissions. "Notchy shifting Update": today In the shifty notchy progress, two days later 125 miles, I did notice a bit better shifting but it will will argue 1st and reverse when stopped on a hill. Rolling is the only trick. (not impressed) but better. Note: the BG oil i removed, was fairly dark after 1300 miles and looked contaminated with graphite. but it was still transparent enough to look like dark honey when coming out of the drain hole. Not a good sign. Lastly when taking the shifter cover off the shifter mount, on top the transmission, I noticed the graphite residue on the back side of the shifter plastic housing and the shifter main rod that goes into the trans to move the shift fork. (Seems like something is making deposits in the oil and on the metal, inside the Transmission.) The most concerning issue, to me was the Long crack looking "scratch" on the center 3rd and 4th gear shift rail. it looked cracked up past the housing. Time to call Tim at Midwest: I called Tim, and update him on what i've found. and sent him pictures. When he responded today, he said it was a scratch according to the tech who assembled the transmission.( Kinda didn't like that the tech remembered he put in, a possibly sub standard part, when rebuilding that transmission.) Tim at midwest who has been apprised of the entire history of this project since its purchase. said to bring it in next week. (a 60 mile track ). But he said they will drop the transmission and take a look at things. Just to let you know this weekend I'm changing the carrier bearing, which shows no wear, and the trans mount just to eliminate those two things from the possible cause of the vibration and giggling in the fourth gear. Also the vibration stops when disengaging the clutch, but comes right back when engaging it again. I haven't heard of others who have had this issue . But if you have a SBDD and any of this is normal let me know please I'll let you know what else happens next week. It may take me longer with work , but Ill post what happens. any insight is appreciated. thanks Guys