high RPMs at highway speed

[2000GPGTBlue2dr]

Here's a price update on my Grand Prix's transmission.
$1150.00 rebuild/overhaul -they put it inside a cleaning booth to remove all the grease after they took it apart- now it looks as good as new.
$287.41 all new parts -includes the 4th gear clutch hub which was stripped out, 4th gear sun gear that attaches to it, and the torque converter which was the most expensive part ($200)- it was replaced because the fact that the metal shavings from the clutch hub could have damaged it. The rebuild kit also includes all the seals, O-rings transmission filter, etc.
$114.99 tax
1552.40 total

Now my car shifts into 4th gear on the freeway, and all is well.

Make sure you find an honest shop to do your work. Look for the ATRA sign in the window which stands for Automatic Transmission Rebuilders Association. If they belong to this Assoc. the work is warranted at any of these shops throughout the U.S. for 12 months or 12000 miles.

[philp1794]

Here is the parts list from the work I had done. Sorry it took so long to post. The total price for the parts (all new) was $585.92. That includes a couple of different gasket kits, the main control valve body ($242) and solenoid ($59), and 4th gear shaft ($113).

[roucka]

Hello;
Interresting that your 98 Grand Prix is/was-doing exactly same issue as my Grand Prix GT. Would not go over 70mph, though read differently. The engine was sounding as if it would rip right-outta the hood, so it was revvvvving but car wasn't responding.

Knew it wasn't the Trani as 60,000 on it,,,usually over+ 100,000 would possibly be Transmission. It infact was the 'Catalytic Converter'. When the mechanice removed it basically it resembled a piece of coal. He then held up what it should look like wich is a finished-metal honey-comb which is fitted into your rear exhaust system.

Fortunately it was covered by Warranty otherwise it in itself is not an expensive part*. Especially compared to cost of the transmission, if infact that is what it is.

Just some input. Mancini ------