Is a 4T65EHD with about 100k miles worth rebuilding?

[USonuMabeaCh]

So I'm trying to get my grand prix back on the road, the tranmission is being a turd, and has been for probably the last 20-30k miles, it really doesnt like the 1-2, and the 2-3 is also crap, and sometimes even the 3-4 sucks. I'm not 100% that the transmission is the issue, but after having the engine replaced (had an oil leak grow bad fast) it's still slipping when shifting, especially on the 1-2, and I figured I might as well get it rebuilt. I was super close to just selling the grand prix to a scrap yard, but with the car market where it is, it's cheaper to try the prix, and I still love the car. It's in dire need of a dyno tune, but I can't do that if the trans is acting up, and I figured I'd try and do that first.


PS I'm looking at doing the upgraded input and output shafts, and maybe even one of those LSDs, any comments about those?

 

[FordMan77]

Strange that it's having issues at that low of mileage but I don't know the maint./abuse history of it. Why do you need a dyno tune? Is this car modded? Tuned?

Take a look at 4T65E Transmission Rebuilds - Triple Edge Performance for some good transmission options. Dave breaks it down pretty well based on your power levels.

 

[Billycar11]

i got mine rebuild at about 108K got the HPS1 from dave/TEP and i happy with it shifts nice and firm and quicker then my other one ever did most times ****s are 100-125 ms and i have it set to 200ms
also got the 3.29 instead of 3.05 that came stock in my 07
i was thinking about the lsd but didnt go with one as any of the good ones will add at least $1000 and they are hard to find.
but i think a guy on here has been talking about starting to produce them again soon.