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what size rear end gears came stock in a 75 monte

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Post by alive 75 on Tue Jan 28, 2014 5:04 pm

has a 350 and came with a 4 bbl from the factory, probably a 350 trans  Very Happy 
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Post by Joe73 on Tue Jan 28, 2014 5:09 pm

Diameter? Probably 7.5" Ratio? Matters what options were put in or ordered.
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Post by 77mali on Tue Jan 28, 2014 5:17 pm

Check your code numbers to cross reference them. There's a bunch of info on here through the home page under Chevy.  The code is stamped on the axle, passengers side between the brake hub & the axle housing, on the side that faces to the front of the car, usually.
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Post by 77mali on Tue Jan 28, 2014 5:23 pm

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Post by ant7377 on Tue Jan 28, 2014 7:36 pm

8.5 rear its probably a 2.73 but could even lower.
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Post by pila on Tue Jan 28, 2014 9:23 pm

I don't believe the 7.5 was used until the '78 models, G bodies etc The 8.5 will take a lot of punishment, from a small block, at least mine have.

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Post by dynchel on Tue Jan 28, 2014 9:33 pm

I think some '77's had 7.5's.
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Post by Limey SE on Wed Jan 29, 2014 3:04 am

My 77 has a 2.56 ick ick
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Post by dynchel on Wed Jan 29, 2014 7:49 am

Limey wrote:My 77 has a 2.56 ick ick
2.56 What a Face  those sound like salt flats gears.
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Post by Dinomyte on Wed Jan 29, 2014 11:24 am

My '77 Malibu has a 8.5" with 2.56:1 gears. salt flats is right.
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Post by Pontichev327 on Wed Jan 29, 2014 7:55 pm

Most seem to come with 3.08 or 2.73. Spin the tire by hand and count the rotations of the driveshaft compared to the tire.
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Post by alive 75 on Thu Jan 30, 2014 10:41 pm

yeah i was thinking about counting the rotation of the drive-shaft, thanks for the info
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