What are your opinions on 3.73's for a 350 TPI?
#1
Thread Starter
Joined: Feb 2001
Posts: 1,415
Likes: 6
From: Tomball Texas
What are your opinions on 3.73's for a 350 TPI?
THe title says it all. Looking for more power, or just want to make it quicker, it has 3.27's in both now. Should I change to 3.73's in both of my cars? They both have the borg warner rear end.
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89 Iroc 350 TPI,
Forged pistions
Comp roller Cam .510 lift 230dur
Flowmaster exhaust
Dart Iron Eagle heads 200cc runners 64cc chambers
MINI RAM SOON!!!!!
stock TPI for now 24# inj
87 Trans Am GTA 350 TPI
had engine fire
SHE NOW RUNS!!!! GREAT!!
Flowmaster exhaust
LT1 Injectors
------------------
89 Iroc 350 TPI,
Forged pistions
Comp roller Cam .510 lift 230dur
Flowmaster exhaust
Dart Iron Eagle heads 200cc runners 64cc chambers
MINI RAM SOON!!!!!
stock TPI for now 24# inj
87 Trans Am GTA 350 TPI
had engine fire
SHE NOW RUNS!!!! GREAT!!
Flowmaster exhaust
LT1 Injectors
#3
Senior Member
Joined: Jul 1999
Posts: 931
Likes: 0
From: Mpls, MN USA
Car: 88 Camaro
Engine: 427 BBC
Transmission: T400
<font face="Verdana, Arial" size="2">Borg warner doesn't make 3.73's. You can get 3.70's for them, but they are expensive and hard to find from what I understand.</font>
I have available (ie for sale) new gear sets and new series 3 posi carriers for the 9 bolt. I currently have 4.10 gear ratios and series 3 posi carriers in stock! Yes, for the 9 bolt! I will be getting some 3.4x and some additional 3.73 ratios soon.
Miles
------------------
88 427 Camaro
12.18 @ 113mph 1.75 60ft
Currently installing 3.73's into my 9 bolt (YES, it is a 9 bolt & YES they are 3.73's, not 3.70. I currently have 4.10 gear sets and new series 3 carriers in stock for 9 bolts )
www.koolmeister.com
#5
Senior Member
Joined: Jul 1999
Posts: 931
Likes: 0
From: Mpls, MN USA
Car: 88 Camaro
Engine: 427 BBC
Transmission: T400
<font face="Verdana, Arial" size="2">3.73s are avaliable from TPIS for $500 with all the berrings and instal kit. </font>
I have available 4.10 ratios with install kit for much less. I will also soon have available, 3.4x and the stronger 11 tooth pinion 3.73 ratio.
Miles
------------------
88 427 Camaro
12.18 @ 113mph 1.75 60ft
Currently installing 3.73's into my 9 bolt (YES, it is a 9 bolt & YES they are 3.73's, not 3.70. I currently have 4.10 gear sets and new series 3 carriers in stock for 9 bolts )
www.koolmeister.com
#6
Thread Starter
Joined: Feb 2001
Posts: 1,415
Likes: 6
From: Tomball Texas
How about precision gear. I have a old catalog of theres at work and they advertise 3.73's. Dated early 90's. 88 427 Camaro do you have any info on your gear sets?
------------------
89 Iroc 350 TPI,
Forged pistions
Comp roller Cam .510 lift 230dur
Flowmaster exhaust
Dart Iron Eagle heads 200cc runners 64cc chambers
MINI RAM SOON!!!!!
stock TPI for now 24# inj
87 Trans Am GTA 350 TPI
had engine fire
SHE NOW RUNS!!!! GREAT!!
Flowmaster exhaust
LT1 Injectors
------------------
89 Iroc 350 TPI,
Forged pistions
Comp roller Cam .510 lift 230dur
Flowmaster exhaust
Dart Iron Eagle heads 200cc runners 64cc chambers
MINI RAM SOON!!!!!
stock TPI for now 24# inj
87 Trans Am GTA 350 TPI
had engine fire
SHE NOW RUNS!!!! GREAT!!
Flowmaster exhaust
LT1 Injectors
#7
I've heard a lot of people say that they have had better experience using 3.45s in thier TPI cars as opposed to 3.70s.
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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End with 2.77:1 Gears.
Current Mods: LT4 HOT Cam, Comp Cams 1.52:1 Roller Rocker Arms, Accel High Flow TPI Baseplate, Edelbrock TES 1 5/8" Headers, Catco 3" High-Flow Catalytic Converter, Hooker 3" Aerochamber Cat-Back System, Transgo Shift Kit, Performance Resource Chip, Accel Ignition, K&N Filters, Jet TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.
Best ET: 14.32 @ 97.7mph
(corrected for elevation)
------------------
1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End with 2.77:1 Gears.
Current Mods: LT4 HOT Cam, Comp Cams 1.52:1 Roller Rocker Arms, Accel High Flow TPI Baseplate, Edelbrock TES 1 5/8" Headers, Catco 3" High-Flow Catalytic Converter, Hooker 3" Aerochamber Cat-Back System, Transgo Shift Kit, Performance Resource Chip, Accel Ignition, K&N Filters, Jet TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.
Best ET: 14.32 @ 97.7mph
(corrected for elevation)
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#9
Joined: Jul 1999
Posts: 10,947
Likes: 21
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
<font face="Verdana, Arial" size="2">Originally posted by AaronIROCZ:
THe title says it all. Looking for more power, or just want to make it quicker, it has 3.27's in both now. Should I change to 3.73's in both of my cars? They both have the borg warner rear end.
</font>
THe title says it all. Looking for more power, or just want to make it quicker, it has 3.27's in both now. Should I change to 3.73's in both of my cars? They both have the borg warner rear end.
</font>
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1991 Camaro Z28
5.7L 5-Speed (originally 305)
317 RWHP, 418 RWTQ
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Member: SoCal F-Bodies
-=ICON Motorsports=-
#11
Senior Member
Joined: Jul 1999
Posts: 931
Likes: 0
From: Mpls, MN USA
Car: 88 Camaro
Engine: 427 BBC
Transmission: T400
<font face="Verdana, Arial" size="2">How about precision gear. I have a old catalog of theres at work and they advertise 3.73's. Dated early 90's. 88 427 Camaro do you have any info on your gear sets?</font>
There is so much bad information floating around about the 9 bolt. It is much better than people think. And parts ARE available. They are more expensive than a 10 bolt, but much cheaper (and lighter) than a 9 inch or 12 bolt. The 9 bolt fills a void between the 10 bolt and the 9 inch in terms of cost, strength and weight.
Miles
------------------
88 427 Camaro
12.18 @ 113mph 1.75 60ft
Currently installing 3.73's into my 9 bolt (YES, it is a 9 bolt & YES they are 3.73's, not 3.70. I currently have 4.10 gear sets and new series 3 carriers in stock for 9 bolts )
www.koolmeister.com
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