How many do you stack in the 3/4 with your borg? I seen ppl saying they can put 5-7 or maybe more. All frictions are Borg EXCEPT 3/4 and hearing more about them makes me regret, but the first build they did the valve body and didn’t kno it was a rebuilt with over sized GM converter valve installed And changed it to a new standard size and it took all of 2 mins to fry the 3/4 so i had it replaced with the z-pak mainly because it was a 1 stop shop in a pack and thought having the 12 or15 (however many is in the z pak) would be beneficial over just having 6 frictions but i guess that’s not the case, the possibility it could have been drove for over 300 miles like this, i do have the slight smell of burnt fluid/clutch but there wasn’t much debris in the pan or filter, but while it’s out I’ll change the clutches it does have the LB1 boost valve installed, also installed the 3 sonnax no-pin accumulators. I would not continue to drive on it until you get pressure rise. 500 boost valve you should be making 200+ psi (usually 230 psi) with trans unplugged. Transgo makes a drop-in slightly oversized replacement, after that it needs to be reamed and oversized valve installed. I don't know about Zpack or how it will hold up with tighter specs than what they recommend.Īs far as pump, the PR valve bore can be worn. Servo pin travel should be 0.060", no more than 0.075". this kills lube to the rear geartrain in any gear. DO NOT stack pistons like a certain hack on YouTube does. this also lubes the rear geartrain fulltime vs 4th only. i also block the 4th accumulator feed with a set screw, discard the piston and spring and drill 4th feed in the 0.093-.110" range. 2nd feed i don't go much bigger than stock as it can hit hard if you go too big. you can peen the hole smaller with a steel checkball and redrill. I personally like 0.100" 3rd feed and 0.082" band release if you are wanting "nice" shifts. i would have gone a bit smaller on band release myself. shift feel can be adjusted with orifice size and accumulator springs & piston stackup. The corvette servo is mandatory on any build IMO. also run the gm nitrided or kolene steels here. I would NOT use Z-pack, the stock borg warner high energy frictions are superior and if you want to go further raybestos gpz, but i have no experience with them only what I hear and for higher power levels.
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