me and my dad got a good deal on a 79 camaro with a 350 th400 tranny and a rear end with 4:11 gears. will the rear end fit in my 85 or do i need something else. will i also need to shorten or lengthen my stock drive shaft.

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won't fit. the 2nd gens used a differant rear than the thirdgens, plus you have the torque arm to deal with.

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-=ICON MOTORSPORTS=-
1st & 3rd

 

can i put the gears in my rearend

 

The gears themselves won't work in the third gen. Wrong size

The diff will fit, size wise, but that's all. The 79 uses leaf springs. 82-00 use coils and a torque arm. You would need to move all the mounting hardware from the third gen diff over to the 79. Then you need to find some way of mounting the torque arm. It's the torque arm mounting that makes diff swapping into a third gen almost impossible. Aftermarket 12 bolts have a mounting pad cast into the housing and ford 9" diffs have an available mounting bracket that just bolts on.

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Stephen's racing page

87 IROC-Z Pro ET Bracket Race Car and knocking on the SuperPro ET class
383 stroker (carbed) with double hump cast iron heads and pump gas
454 Big Block buildup now in progress for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857
Best corrected ET: 11.163
Best MPH on a time slip: 117.87
Best corrected MPH: 126.10
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

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

 

schould i just sell the rear end and buy a ford 9 inch