Need Stock Specs Info on 1989 Rear End (Formula 2.73 Open)
04-15-2014, 04:43 PM
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Car: 1990 Formula Firebird
Engine: 305TBI w/ Functional Sport Hood CAI
Transmission: 700R4
Axle/Gears: SLP Posi and 3.23 Gears
Need Stock Specs Info on 1989 Rear End (Formula 2.73 Open)
So I converted my 2.73 Open to a 3.23 w/ SLP Posi.
What I need to know is the capacity of the rear end of that year on a 1989 Formula Firebird (not sure how often this changed, if ever).
I also need to know what weight oil to use and if I should go complete synthetic or use a blended synthetic.
I'm sure this has been answered somewhere before, but I need to make sure this is correct
Posi Unit:
What I need to know is the capacity of the rear end of that year on a 1989 Formula Firebird (not sure how often this changed, if ever).
I also need to know what weight oil to use and if I should go complete synthetic or use a blended synthetic.
I'm sure this has been answered somewhere before, but I need to make sure this is correct
Posi Unit:
04-15-2014, 08:30 PM
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Car: Yes
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Re: Need Stock Specs Info on 1989 Rear End (Formula 2.73 Open)
Year doesn't matter.
Those are all about 2 qts; maybe just a scosche more. Varies a bit according to what gears & carrier are in them but not by much.
Yes pure synthetic is the better choice. Can't think of a good reason to dilute it with dinosaur juice.
Those are all about 2 qts; maybe just a scosche more. Varies a bit according to what gears & carrier are in them but not by much.
Yes pure synthetic is the better choice. Can't think of a good reason to dilute it with dinosaur juice.
04-15-2014, 09:34 PM
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Car: 1990 Formula Firebird
Engine: 305TBI w/ Functional Sport Hood CAI
Transmission: 700R4
Axle/Gears: SLP Posi and 3.23 Gears
Re: Need Stock Specs Info on 1989 Rear End (Formula 2.73 Open)
What weight of oil?
04-16-2014, 06:05 AM
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Car: Yes
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Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Need Stock Specs Info on 1989 Rear End (Formula 2.73 Open)
75W-90; that being the stuff you can get the easiest.
04-17-2014, 11:14 PM
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Car: 1990 Formula Firebird
Engine: 305TBI w/ Functional Sport Hood CAI
Transmission: 700R4
Axle/Gears: SLP Posi and 3.23 Gears
Re: Need Stock Specs Info on 1989 Rear End (Formula 2.73 Open)
Is there any reason to pay more for stuff like Royal Purple or Lucas vs. something like Mobile 1 (all same weights and synthetics)
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