My confidence in this transmission is going downhill quickly. The one in there is for a 4.3L so the brain trust that rebuilt the transmission didn't even put the right torque converter in it. I also talked to the company that made the torque converter (PDQ) that's currently in the 4L60e and they told me it was the wrong converter. Maybe upgraded springs in the valve body but it was overhauled since then so all the upgrades were probably long gone before pulled it out and put the TransGo shift kit in. I message Tranzman ask him about this 4L60 he told me it's probably nothing special. The case number (6CPD) C- police Truck 4L60e. Going by the mileage from 2017 to when the title was junked on 04/15/21.The 4L60 has approximately 52,388 miles on it. From what the Carfax says, it looks like the transmission was overhauled May of 2017. Looks like the same person owned it until it ended up at pick n pull. Then there is a year gap and the 06 Tahoe shows up here in California October 17th of 2014. The title change hands four times in October of 2013. It used to be NYPD vehicle came into service on retired and sold on. I'll be interested in Frank Performabuilts insight on this as well.Did a Carfax on the 2006 Tahoe My 4L60 came out of. I know this is kinda off topic but I figured I would throw it out there. Basically Im saying to "properly" do it requires the mechanical parts and upgrades to make firm shifts rather than relying on tuning to solve it for you with forced pressures. 90psi is the stock pressure for 05/06 GTOs and I still use that setting with my built trans with shifts recorded. IMO, a proper shift kit should be utilized to deal with shift upgrades rather than taking shift pressures above 90psi with tuning alone. There is a decent trans guy on the HPT forum that always says dont bump line pressure without it.
Five-pinion planetaries, along with a higher capacity input housing and induction hardened input shaft assembly, were improved to withstand up to 380 ftlbf (515 Nm) of torque.
The Corvette servo can help in firming up the 1-2 shift and I've also read that it is more apt to dealing with shift pressure increases. Jacked from wiki: An updated 4L60-E, the 4L65-E (RPO M32), was phased in around the 2003 model year when coupled behind the 6.0 Vortec. There is also aftermarket servos that are just as good or better made by companies such as Sonnax, TransGo.etc. The 4L60/65E series "Corvette servo" will work in non-equipped models.
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