TR 3650 Problems

[YearOne]

Hey guys! This is my first post on here, and I am having some problems with the infamous TR3650. I just purchased a good used Mach 1 from my local Ford Dealership. I have had it about a month now. The other day driving home I started getting a grind going into third gear. In the morning when I woke up and started for work, it was colder out, about 45 or so and it had went away, but it seems as I drove it more and it got up to normal operating temp in the tranny the problem presented itself once again. I took it and had the Tranny flushed and refilled thinking the fluid might be getting crappy. Still no improvement. I have read many bad posts about the 3650, and "gear-grinds"when it is cold... but never warm. My only guess is at colder temps the viscosity of my tranny fluid along with the pressure is greater and it runs better like that, when it heats up it thins out. Any thoughts on this? Possible fixes that have worked for someone with a similar problem? Different Fluid..... (I keep hearing RP works good) any/everything will be greatly appreciated! I am not sure if my syncro in third is going out cause it works fine when cold, but not when warmed up. If it was I would think I would be feeling it regardless of temp. Thanks!!:SNSign:

 

[StangYellow]

http://forums.stangnet.com/showthread.php?t=328655&highlight=tr3650

 

[SilverBullet00]

If its under warranty, id take it into ford. If not I would try different fluid. I went with a regular mercon III at autozone (2.59 a qt) and put in 3.2 quarts (it was suggest somewhere, I dont remember where). It shifts WAY smoother now, the only thing is tranny makes a rattling and clanking sound when in fifth gear- so I might try and add a little fluid to it..

 

[squeak93]

Get if fixed..... It will only get worse. If the car is under warranty and the dealership you took it too won't fix, go to another. I had to drive my car 3 hrs to another dealership but I got a brand new tranny out of the deal.

 

[Tripoli]

I had RP in my 3650 for over 90,000 miles and always had a grind when shifting 2nd. I finally read that post about using plain-ol' Dexron III, filled her up with the proper amount, and presto, smooth-shifting 3650.

It's still a crap transmission, though. I'm looking to put a T-56 in mine.

 

[Mach1Run]

drive it till it gets ready to splode, then t56 swap. worked for me.