The 3.45 gears in my 5speed GTA...I realize their potential is limited. What are its limits in stock condition? And...can it be strengthened any?


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89 TransAmGTA L98/Auto Grey/Grey T-Tops
Best 1/8th: 9.02 @ 76
89 TransAmGTA LB9/5speed FlameRed/GreyLeather Hard Top
My Baby

 

I've been running high 7's (1.72-1.75 60 ft) with my 9 bolt for 3 years now, no problem. Just make sure the gear backlash is set at (~.008-.010) and the side gears (brake cone) is under under .008.

Miles

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88 427 Big Block Camaro
(Best 1/4) 12.18 @ 113mph 1.75 60ft
(Best 1/8) 7.76 @ 94mph 1.72 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 posi carriers for sale for 9 bolts )
www.koolmeister.com

 

My 7.5" 10 bolt has been beefed up and is surviving low 7's in the 1/8 mile.

A manual transmission is more abusive to a diff than an automatic is. The stock diff can't take the shock very well.

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Follow my racing progress on Stephen's racing page
and check out the race car

87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block (times are for the current engine)

Best ET on a time slip: 11.447 altitude corrected to 10.99
Best MPH on a time slip: 119.42 altitude corrected to 124.86
Altitude corrected rear wheel HP: 493
Best 60 foot: 1.586

Racing at 3500 feet elevation with a typical race day over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

 

What tools do I need? and how can I check the backlash settings, etc.?