82 and rpms
Le Mans Master
Joined: May 1999
Posts: 6,692
Likes: 29
From: Texas
My changeout was done by a transmission shop and they made a couple attempts to get the tooth gear correct. Do not know what is in there, but it calibrates correctly with those radar things you see on the side of the road to tell you how fast you are going.
Burning Brakes
Joined: Oct 2011
Posts: 1,093
Likes: 2
From: long beach California
I am thinking that with an overdrive trans in your 1980. That your car has to have somewhere around a 3:73 or more aggressive for your car to be pulling 3k rpms at only 60mph. That just seams too high are you sure your speedo is reading correctly? If you have a gps speed app on a smart phone or just a gps unit. Test your speed against the dash speedo. If they are both reading the same you likely have a more aggressive rear diff than 2:80 gear. If the gps reads much higher speed than the dash speedo. then may need to inspect/lube your speed cable. to get rid of drag that would make it read slower. Also have your speedo gear checked to ensure it is correct.
Drifting
Joined: Dec 2011
Posts: 1,743
Likes: 289
From: Chardon Ohio
There's an easy way to determine what the rear end gear ratio is. You jack up the rear wheels and turn the drive shaft. Note how many turns of the drive shaft there are to one turn of the rear wheels. ....something like that - there is a thread on it somwhere...
Jim
Jim
Burning Brakes
Joined: Oct 2011
Posts: 1,093
Likes: 2
From: long beach California
