This is why I prefer to refer to you as "Mr. Forced Induction."
Texas82GP's GMT900
- Thread starter Texas82GP
- Start date
Haha, I seriously just read that several times in his voice too lol.
So, I've got around 1100 miles on the swap. The truck runs the best it ever has since I swapped in the cam. The tuner really nailed it. I still think the stall speed is a bit high to be optimal but I don't find it extreme at all anymore, and really I'm splitting hairs. There is no way I would pull the transmission to swap the converter, and if I did, I might find myself disappointed with the result. I think it is that close. My buddy that runs the transmission parts house came out to the house last weekend for a visit. I let him take it for a spin and he was really surprised by how the converter felt. He didn't find it extreme at all and he really expected to. I didn't ask him but I doubt he's ever driven something with a 3600-3700 stall speed. Poor guy, he slightly got on it and the ABS light came back on. I gave him a hard time for breaking my truck. I scanned the codes and it is a rear wheel speed sensor malfunction code. Thankfully there has been no return of the CANBUS code since I cleaned up the main connector at the transmission. I went ahead and ordered two new rear wheel speed sensors last night. If I'm going to replace one, I'm going to replace both and hopefully be done with it.
I also ordered a Derale fluid control thermostat to help the transmission run warmer, especially this winter. Right now, if I hot rod it in the teeth of rush hour traffic while it is 98° outside, the transmission will grudgingly get up to 151°, so I guess the transmission cooler is big enough. Based on my research, the thermostat will make the transmission run at 165° year round. I haven't installed it yet but it seems really nice. Made in the USA....
https://derale.com/product-footer/fluid-coolers/thermostats-1/fluid-control-thermostats/13011-detail
So at some point before it gets cold, I'll dig back into the lines between the transmission and the cooler and plumb this in. I bought brass fittings to convert the 3/8" NPT of the thermostat to inverted flare so everything will still be 3/8" hard line.
I guess that's about it fellas. I'm really enjoying how well the truck runs. I've gotten on it pretty good (no WOT yet) and it is plenty fast for me. She's a thirsty girl though. I'm really glad to have it back and have no regrets swapping in the 4L85E. I'll update when there is something to report or when I put in that thermostat.
I also ordered a Derale fluid control thermostat to help the transmission run warmer, especially this winter. Right now, if I hot rod it in the teeth of rush hour traffic while it is 98° outside, the transmission will grudgingly get up to 151°, so I guess the transmission cooler is big enough. Based on my research, the thermostat will make the transmission run at 165° year round. I haven't installed it yet but it seems really nice. Made in the USA....
https://derale.com/product-footer/fluid-coolers/thermostats-1/fluid-control-thermostats/13011-detail
So at some point before it gets cold, I'll dig back into the lines between the transmission and the cooler and plumb this in. I bought brass fittings to convert the 3/8" NPT of the thermostat to inverted flare so everything will still be 3/8" hard line.
I guess that's about it fellas. I'm really enjoying how well the truck runs. I've gotten on it pretty good (no WOT yet) and it is plenty fast for me. She's a thirsty girl though. I'm really glad to have it back and have no regrets swapping in the 4L85E. I'll update when there is something to report or when I put in that thermostat.
It actually isn't good to have your transmission too cold, just like too warm is bad.. 175ish give or take is a nice temp
Thanks for the reply. I totally agree and I think it is really running too cool now so when the temperatures start dropping in November it is going to run way too cool. With the previous setup (4L65E 3000-3200 stall and OE auxiliary transmission cooler, I would occasionally see 200° or a little better in the teeth of rush hour on a 100° day. With the higher stall speed, I wanted to make sure I had enough cooler and wanted it to run around 180°. I just overshot it. The thermostat that I bought is rated at 180° but I read many reviews using it with 4L80E's in GMT 800's where they said it ran 165° all the time. I think 165° will be fine.
You actually got me to look into it. It would be cool but too expensive this year. After family vacation, I'm buying the coil overs so I can do the conversion. I already have the brackets for it. I also need some GP budget. I have most everything to put it back together but I'll find a way to spend another $2k-$3k pretty easy getting it back together.
Also, this will sound strange, it's fast enough for my daily.
