i found a rear end out of an 85' monte carlo ss thats posi with 3.73 gears. Will it fit in my 86 Z?

 

don't think the monte has a provision for the torque arm. if you're talking just the carrier it'll fit.

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-=ICON MOTORSPORTS=-
1st & 3rd

 

The housing won't fit at all. The rear suspension is completely different. The gears might. Most g-bodies had 7.5 gears but some are 8.5. If it's a 7.5 diff than you can swap the gears and carrier over into the f-body diff.

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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

 

it is a 7.5" so i should be able to swap parts on them right?

 

If your 86 Z has 3.08 gears or lower then the 3.73 gears will probably not fit unless they are aftermarket gears made for the 3.08 and 2.73 gear carriers. Richmond makes these gears for the 3.08 housings that are lower than a 3.08 (lower meaning 3.42, 3.73, ect). Stock GM 3.73 gears will only fit in a housing that came with 3.23 or lower gears.



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1988 TA 300+hp 350 w/ TBI and Holley TB unit, Holley projection intake,
WC T-5, 3.42 gears w/ Auburn posi. MSD 6A, edelbrock TES headers, dynomax 3" cat and cat-back system, ACCEL coil, polyurethane bushings all around, aluminum driveshaft, Mr. Gasket open air cleaner.

1993 S-10 w/ 4.3L V6 TBI, slightly bigger cam, Mild polish job and 3 angle valve job on heads, Edlebrock TES headers, Dynomax cat back, MSD 6A, ADS chip

2000 Kawasaki KX 125

 

is there a code somewhere that will tell me what gear is in there now? i think they are 2.73 gears but im not positive.