What would be involved and how hard would it be to swap a stock 3:27 rearend in place of gas guzzling 3:73's. I just can't afford the gas up here in Canada, plus I like the 3:27 gears because of it's mix of decent acceleration and highway mileage. I do ALOT of highway driving. The guy who owned the car before me put in the 3:73's.

 

Oh yeah the car is a 1988 L98 GTA....the donor 3:27 rearend is also from a 1988 L98 GTA.

 

The 3.73 would be a 10 bolt. The 3.27 would be a 9 bolt. If both are drums or disks then it's a direct swap (complete housings). If one is drum and the other is disk then you'll need to change the proportioning valve and probably the brake cables and hoses.

All third gen rear ends are direct swaps from model to model. 4th gen diffs can also fit but they are 2" wider per side.

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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
LS6 Big Block buildup now in progress

Best results before the engine 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

 

if you feel like driving down to connecticut, ill swap my 3.27 for your 3.73...ill even do the labor...