Is shifting at 1,800 rpm damaging my Mustang? What about 3,000 rpm?

Dear Car Talk | Feb 01, 1993
Dear Tom and Ray:
Shirley
RAY: No, and it probably won't hurt your car either, Shirley.
TOM: Neither one of you is doing any damage. You're both within reasonable limits. As long as he's not shifting so early that he's lugging the engine (making it chatter and buck), then he's not shifting too early.
RAY: And as long as you're not running it up near the red line every other shift, you're not putting any great strain on the engine either.
TOM: Rest assured, Shirley. This problem is causing more strain on your marriage than on your car.
Shirley
RAY: No, and it probably won't hurt your car either, Shirley.
TOM: Neither one of you is doing any damage. You're both within reasonable limits. As long as he's not shifting so early that he's lugging the engine (making it chatter and buck), then he's not shifting too early.
RAY: And as long as you're not running it up near the red line every other shift, you're not putting any great strain on the engine either.
TOM: Rest assured, Shirley. This problem is causing more strain on your marriage than on your car.
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