Instant Shudder Fixx

[V-8]

Had a part throttle transmission shudder between 1000 & 2000 rpms in a high mileage '95. Bought the Instant Shudder Fixx off Amazon and am pleasantly surprised by the result.

 

[1997ThunderbirdLXV6]

Formerly known as "Dr. Tranny". Yes, it does work; however, you achieve the same result by changing the fluid. There are differing opinions about that on higher mileage cars with unknown maintenance history.

There are also Technical Service Bulletins on the subject which are an interesting read.

 

[KevinVarnes]

I also used the Lubegard in our '97 and it worked well after a complete trans fluid change made little improvement. It is surprising how four ounces can have any impact, but it did. I just bought mine at NAPA since I cannot stand supporting Amazon.

 

[theterminator93]

The main cause of the shudder is the breakdown of the fluid and burning up of the friction modifiers due to prolonged (over)heating. The best fix is an aux trans cooler and fresh fluid (or more frequent fluid changes) but if it's never been serviced before and the clutches are toast, the bottle is just as good as anything else if it staves off a rebuild.