7.5 or 7.625???

[newkid86]

not sure if this is the correct page to ask this on but i'll just get on w/ it. i was told that my 86 monte carlo does not have a 7.5 but a 7 5/8 rear. i was unsure about this b/c i thought that only late model f-body cars had 7.625 rears. so besides opening it up n' counting the splines how can i tell? what years (if any) did monte carlo's come w/ 28 spline axels?

 

[Phoenyx]

LMAO....

Let me guess. You didn't do to good in math, right?

 

[Lue]

I have also read that MC ss came with a 7.625 rears. Check this link out, and scroll all the down..

http://www.montecarloss.com/SS_FAQ_1.html

 

[newkid86]

LMAO....

Let me guess. You didn't do to good in math, right?

not good in math??? how u get that? idk about other places but we don't talk about rearend splines, ring/pinion gears n' other car stuff in my math classes.

 

[Phoenyx]

i was told that my 86 monte carlo does not have a 7.5 but a 7 5/8 rear. i was unsure about this b/c i thought that only late model f-body cars had 7.625 rears.

Hmm, 7 5/8 or a 7.625? Which one could you possibly have? :lol:

 

[newkid86]

I have also read that MC ss came with a 7.625 rears. Check this link out, and scroll all the down..

http://www.montecarloss.com/SS_FAQ_1.html

mmm... good link. that explains it but leaves 78-81 unanswered so are they 7.5 rears?

 

[Phoenyx]

Nevermind. I was still half asleep when I read your first post. Sorry lol.

But the ss came with the 7 5/8. GNs and 442/hurst olds came with 8.5. Everyting else came with a 7.5.

Usually

 

[pontiacgp]

if you open it up you can tell by the size of the axle at the splines.....28 is a larger diameter than a 26....and by the sounds of you don't know what the condition of the differential oil so you might want to open the diff to check what you have and change the oil....seems like that the differential oil isn't changed too often seeing how many guys post questions about what they have in the rear end.