99 transmission slipping in low gear

Charlotte NC here...cool forum... just got a 1999 4runner after wrecking my 98. The transmission slipping a little in low gear...automatic R150F... solenoid?

 

Welcome to the site John

 

Thnx brother 4runner

 

Does it only slipping first when in the "D" range? or when the shifter is all the way into the "L" gear? Difference is in holding devices, may be a holding device active in "D" that isn't active in "L", and vice versa. Many people have a service manual, do you also have one? Proper Road Test, Mechanical, and Stall tests would be described in it. Following the test procedure, and results of tests could tell you if you had a mechanical or electrical fault. Usually if you have a faulty solenoid a trouble code is stored, but not always. I'll see if I can print some test procedures for the R150 while I'm at work.