rear end gear ratios for 87 cutlass

[ryanelco]

hey guys, just dropeed an 87 cutlass rear in my el camino, b/c i cracked the housing on my stock rear. i know the gears arent anything special and its a non posi, but was wondering what the gear ratio might be. thanks in advance.

 

[85 Cutlass Brougham]

it depends on the engine and trans the car came with and if it had an optional ratio, but the most likely is a 2.41. It could also be a 2.56, 2.29 or the sexy 3.23.If it was a 442, it would be the stronger 8.5 rear with a 3.73.

 

[ryanelco]

thanks a lot. i have a feeling its the smallest one, my cars a dog off the line. oh well.

 

[pontiacgp]

I would suspect you had the cover off the change the diff oil and you could have checked the numbers of teeth stamped on the gears to calculate the gear ratio....

 

[Alanco]

thanks a lot. i have a feeling its the smallest one, my cars a dog off the line. oh well.

Check out my 3.42 7.5" ring and pinion in the auction link page. Asking $35 and it ships cheap.

Alanco

 

[marcar1993]

The cutlass's had from 2.14 up.

 

[85 Cutlass Brougham]

Yeah, but 2.14's are diesel only, and I don't think the diesel was available in the 1987 models.

 

[hotrod86]

not positive but i thought the 2.14's were standaard with the olds 307 engine? let me know

 

[85 Cutlass Brougham]

not positive but i thought the 2.14's were standaard with the olds 307 engine? let me know

I think the 2.29 was, not the 2.14. I dunno what GM was thinking with that gearing....maybe they thought people were buying them to go land speed racing? :lol:

 

[ryanelco]

i guess that was their line of thinking. its great my car can do 300 mph, but 0-60 in ten minutes. lol 😀