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1984 Pontiac Firebird high RPMs

Tiny
JOSHBEME
  • MEMBER
  • 1984 PONTIAC FIREBIRD
1984 Pontiac Firebird V8 Two Wheel Drive Manual

My car has a beefed 500 hp 1st gen chevy sb 350 4 bolt main. The engine is the only thing that is not stock. Stock 5 speed and stock 3.23 rear. I seem to be shifting real quickly through the gears. At 45 miles per hour in fifth gear it runs 4500 rpms. This is always the case it is never different, always the same. What is causing the unusual.
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Tuesday, February 3rd, 2009 AT 11:50 AM

2 Replies

Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
That seems impossible. Its simple math. The horsepower of the engine doesnt matter its the revolutions per minute. 3.23 gears are basically highway gears. You say stock 5 speed so I imagine its a standard. Is it possible the transmission is not shifting into 5 gear? What size tires are you using. Stock would be 215/65/15 or 245 50 16. If you are using a much smaller tire then that could be the problem
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Tuesday, February 3rd, 2009 AT 12:51 PM
Tiny
MASTERTECHTIM
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Oh yeah if you have a automatic transmission 700r4 transmission with 4 speeds and torque converter lock up then I would imagine the transmission is the problem. It would have to be
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Tuesday, February 3rd, 2009 AT 12:53 PM

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