I have a 96 4runner 3400 auto trans sometimes at varying speeds she will shudder or clunk like its a hard shift from overdrive or something this is a standard 4runner except for the tires might be one size larger has anyone else had this problem?

 

Try Dr. Tranny Instant Shudder Fixx by International Lubricants. It helped mine tremendously. I can't beleive something liquid could help that much, but it sure did for mine.

Chris