Question about 1998 Pontiac Grand Prix

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1998 Pontiac Grand Prix GTP 3.8 supercharge, Automatic Transaxle - 4T65-E rebuilt 2 years ago. Drove to work (26 miles) and all was fine, got in to leave and put gear selector in drive or 1st and nothing (no kick, just like it is in neutral). Reverse, 2nd and 3rd are working fine. What could it be?

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Your transmission for the GTP should be the 4T65-HD. If in fact it is not then that could very well be the problem. The 4T65-E is for the other 3.8L naturally aspirated models.

Posted on Oct 22, 2010

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Will the motor and tranny from a 1998 pontiac grand prix GT 2 door coupe 3.8L motor fit in a 1998 pontiac grand prix GTP supercharged 3.8l motor


everything will cross over but the engine and transmission in the gtp are suppose be heavier duty built

Mar 02, 2015 | Pontiac Cars & Trucks

1 Answer

Transmission Compatibility


As you see I provided you the models you can apply the transmission :The 4T65E-HD (code MN7) is a heavy duty version of the 4T65-E used with more powerful engines such as the LS4 V8 and L67/L32 supercharged V6. Applications: 2.93:1 MN7 Pontiac Bonneville SSEi L67 Chevrolet Impala L67 Chevrolet Monte Carlo L67 Pontiac Grand Prix GTP/GXP Buick Regal GS Buick Riviera L67 (97-99) So ,yes you can!

May 28, 2013 | 1998 Pontiac Grand Prix

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Yes I have a 1998 pontiac grand prix gtp on the supercharger, there is a pulley on the end of it!. Does this pulley have a bearing in it!


The pulley itself does not have a bearing in it. The shaft however that the pulley is pressed onto does, inside the snout.

Oct 18, 2010 | 1998 Pontiac Grand Prix

1 Answer

2000 Grand Prix GTP supercharger fluctuates when accelerating


There is no wastegate.

Change the spark plugs and pay special attention to the plug on bank 3. Look for physical damage on the electrode...cracked, bent etc.
Use Autolite 605's copper core gapped to .055" and NEVER run less than 92 octane.

Apr 02, 2010 | 2000 Pontiac Grand Prix

1 Answer

New transmission


The best place you'll ever find parts and service for the GTP is www.zzperformance.com

They have their headquarters garage and then several authorized satellite locations in a few states. They make their living on working only with the GTP exclusively.

Jan 29, 2010 | 1998 Pontiac Grand Prix

1 Answer

How supercharger oil is need for the supercharger, 1997 Grand Prix GTP?


The oil should be changed every 30K miles according to the Pontiac manual.
However, it is best to change it sooner or whenever you don't know when the last change was done.

Dec 11, 2009 | 1997 Pontiac Grand Prix

4 Answers

1998 Pontiac Grand Prix GTP Supercharger coupler


The rattle you are/were hearing is typical on the Eaton blowers. After they get some miles on them, the coupler wears out and the holes become ob-longed or out of round which causes the rattle you are hearing.
Usually at idle you can hear it very clearly.
I have changed a few, and they are pretty simple to change. Just take off the supercharger belt, then you may have to remove your alternator bracket, depends on which years, drain the supercharger oil with a spray bottle sprayer (it does stink badly) then just remove the 10 or so bolts that hold the snout to the housing. Remember to keep track of where they go, some are different lengths.
You may have to use a rubber mallet, or your hand to hit the snout around to break the gaskets loose. Pull off the old black hockey puck looking thing (coupler) clean out the snout, attach new coupler, then reassemble and put new supercharger oil back in, and your rattle will be gone, at least for another 100k miles.
Best place to get a coupler is at,
http://www.zzperformance.com/grand_prix/products1.php?id=155&catid=106
Costs about 30, plus the few bottles of oil for the supercharger.

May 15, 2009 | 1998 Pontiac Grand Prix

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