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Found 2 results

  1. First thread on here, hope it helps people. **!!** DISCLAIMER **!!** Yes i know this is an 8 spd and its supposed to feel different than other automatic transmissions. AND Yes, I know these transmissions had a lot of issues out of the factory. **!!** DISCLAIMER **!!** Looking to find out information/recommendations for full fluid flush (cooler and all) and filter change for 2016 silverado 1500 with 6.2L and 8spd with max trailering pkg (which i think makes it an 8L90, havent confirmed yet) with almost 90000 miles (maint schedule from chevy for 2016 says trans/tfr case/diffs fluids due at 90k). I have a hard shift from 1 to 2 at very low speeds sometimes (especially when cold, but that makes sense because fluid dynamics), basically parking lot driving. I also have a weird deceleration when up to temp when taking off from a light less than 1/4 throttle, going from 1 to 2. Its almost like its slipping too long between 1st and 2nd. My body physically moves forward due to what feels like pushing the clutch in during acceleration. No banging or loud noises, just noticeable loss in acceleration. Just bought the truck at 88750 miles. If it matters, it has had PCM warranty reflash in the past, not sure based on garbage maintenance records if a flush had ever been performed. What I know: Dealership quote (Milwaukee, WI area) before 10% discount: - Gasket $36.21 - Filter $30.17 - Fluid $170.20 (represents 20 qts., *not sure if capacity or thats just how much they use when flushing*) - Labor and shop supplies $546.29 (this price makes me think that it is more than just a flush, like they are opening the system and forcing fluid and or cleansers through all components that touch trans fluid to make sure its fully flushed/cleaned. if just flush where they hook up to machine, this is such a damn rip off) Transmission fluid I am supposed to use to avoid shuttering or issues due to moisture absorption that was initially experienced according to GM TSB# 18-NA-355 (*PLEASE LET ME KNOW IF THIS IS OLD TSB#*): - (*HAS TO BE WITH BLUE DOT, NOT BLACK DOT) Mobil 1 Synthetic LV ATF HP It has never had the fluid changed before to my knowledge I'm trying to figure out what the latest GM factory procedure (either with a TSB# or whatever work order code is used) is so that I can communicate to multiple dealerships nearby so I can get pricing on actual same services. Here is the link that describes it a lil more and shows the fittings that they put on transmission for flush: https://gm-techlink.com/?p=11127 And here is another about the TSB for fluid (this one is more recent than the one above): http://gmauthority.com/blog/2019/08/tsb-seems-to-fix-8-speed-automatic-gm-transmission-problems/ I plan on getting a fluid sample of the transmissions fluid from dealer prior to changing so that I can send it out and get it tested so I have a record. (I will post the results of tests here when I get them). I got my free test sample bottles from Blackstone Laboratories (If you or your friend has an in with GM engineering and/or happens to know the pass/fail criteria that they use to decide whether or not to cover transmission or torque converter replacement, please let me know. I'd like to know what to look out for when I get my results from fluid testing) This is the most expensive thing I have ever purchased, i have extended warranty on it just because I'm worried about the transmission and obviously all the electrical doodads that new vehicles have nowadays, I just want to make sure I am taking care of it correctly. Would love to hear from seasoned GM certified techs and/or ASE master mechanics/techs and/or GM Engineers. Also please chime in with prices you've experienced including general location you're from so I can get an idea if this dealer is trying to rip me off. (so far the only thing I dont trust is the labor/shop supplies in the quote above, depending on what the procedure is)
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