my jag has the 4L 6

i think my tach shows high aether that or the shift points re-limiter has been raised and possibly rear end ratio if its correct




in sport mode the tach will go all the way to 7000 rpm before the auto transmission shifts when you put it to the floor. the motor sounds good no valve float or other issues.

anyone have any light to shed on this topic?

 

Sorry I don't have an answer to your question but, Sammy Hagar comes to mind.
"I can't drive...........55!"

Bill

 

Doesn't seem right at all.

What happens in normal mode?

Cheers
DD

 

it won't rev out quite as high in normal mode. speedo is pretty darn close iv compared it to a gps. idle rpm show about 800

 

My 1994 4.0 automatic delivers 31 MPH in fourth gear with the converter locked. At 120 MPH the tach should be, all other variables considered, (rolling resistance, wind resistance, etc.) right at 3900 rpm. This is theoretical of course, but an indicator that the relationship between your tach/speedo relationship is suspect.