Originally Posted by Trav
Originally Posted by Mark72
I bought this car used a year and a half ago used with 147,000 miles. It was a one owner and the guy took really good care of it. The ATF still looks clean today. I guess I have a couple questions. If it's still clean should I mess with it? I dont know when it was last changed. And when I do change it, is there any harm in having it flushed or should I do the pan drop, filter and just refill?
If its the original transmission the 4th gear input shaft will probably be the failure point in the not the too distant future regardless of fluid changes.
You can do a line off exchange on these very easily after dropping the pan and installing a new filter, you may as well install a shift kit while you are in there, it will help keep the P1811 code at bay.
Add a cooler to it and keep in in 3rd gear until your on the highway to help keep the 4th input shaft alive longer.
I have used Amsoil ATF in these with good results, Maxlife or dex VI blows in these IMO, they shift softer than a wet noodle. The higher viscosity synthetic ATF gives a slightly firmer shifts.
This is the US made filter you want..
https://shop.tripleedgeperformance.com/4T60E-65E-Filter-84710E.htm
You can reuse the original pan gasket a few times if it is still there.
The shift kit..
https://shop.tripleedgeperformance.com/Transgo-SK4T65E-Shift-Kit-K84908M.htm
Lots of good info on this transmission the 4T65E on the site.
Good info. Like to add, I have used this low cost item to resolve an issue with the 4T60E/65E transmissions.
https://www.sonnax.com/parts/2534-differential-lube-tube-retainer-kit
You may also want to check out TSB 08-07-30-040B There is an upgrade to the oil pan magnet. Part# 29535617 , I get them at Rock Auto.
https://www.rockauto.com/en/parts/acdelco,29535617,oil+pan+magnet,18538