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G3GM 1973 to 1977 A-bodys. Chevelles, Monte Carlos, El Caminos, Laguna, 442, Cutlass, Malibu, GTO, LeMans, Century, Regal, Grand Am, Grand Prix, Sprint, Gran Sport, Can Am, Hurst-olds, and other 73-77 A-bodies


74 chevelle 28 spline?!?!?!?

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74 chevelle 28 spline?!?!?!? Empty 74 chevelle 28 spline?!?!?!?

Post by JF74chevelle Thu Nov 05, 2015 10:52 pm

Does my 74 chevelle have a 28 spline? Idk where to find the info on this
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Post by alowerlevel Fri Nov 06, 2015 1:24 am

28 spline what? If your asking about axles then yes they are 28 spline.
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Post by JF74chevelle Fri Nov 06, 2015 1:56 am

alowerlevel wrote:28 spline what?  If your asking about axles then yes they are 28 spline.
my bad I left that off lol thank you for the help
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Post by redrider Wed Nov 18, 2015 11:59 am

Any idea what the stock gear is on a non posi 74 10 bolt rear?
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Post by thatfnthing Wed Nov 18, 2015 1:11 pm

Likely 2.73 (mileage) or 3.08 (performance)
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Post by Limey SE Wed Nov 18, 2015 3:09 pm

Mine is a 2.56 ickkk icckkkkkk

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Post by pila Wed Nov 18, 2015 4:03 pm

My new '77 Elco was a 2.56, and My Malibu has 3.08 on the build sheet but it turned out to be a 2.73 !

2.56 seems low, but my Currie nine inch Ford in the Elco project is a 2.50, which I spec'ed for the 5oo torque monster, which will rarely see any high RPM...

 Don't know what the lowest ratios are out there, but some 5th gen Elcos ('78-'87) seem to have like 2.29 ratios in some of them.  All about gas mileage I would suppose....

redrider; you can find your diff. ratio stamped on the front side of the right axle housing tube, usually near the center housing casting.    I don't have the code handy, but folks here can tell ya what it is....

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Post by thatfnthing Wed Nov 18, 2015 4:21 pm

pila wrote:My new '77 Elco was a 2.56, and My Malibu has 3.08 on the build sheet but it turned out to be a 2.73 !

2.56 seems low, but my Currie nine inch Ford in the Elco project is a 2.50, which I spec'ed for the 5oo torque monster, which will rarely see any high RPM...

 Don't know what the lowest ratios are out there, but some 5th gen Elcos ('78-'87) seem to have like 2.29 ratios in some of them.  All about gas mileage I would suppose....

I can see where a stump-pulling 500 could easily overcome the 2.56, but the 5th gen's running 2.29 with an OD trans really surprises me.  The 200-4R's OD gear is .67, which would make an effective ratio of 1.53 -- when OD kicks in at 40-45 MPH and the TC locks up, the RPMs would drop so low that I don't see how the thing wouldn't just die.  I drove mine with the stock 2.73 gear for a week or two after swapping in the 200-4R just as an experiment, and when OD kicked in the RPM's fell so far below the engine's power band that the car became an unresponsive slug.  I can't imagine it would even keep running with a 2.29 out back...
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Post by Limey SE Wed Nov 18, 2015 4:28 pm

Its almost half way between the pumpkin and the brake backing plate on right side of car facing front of car.

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Post by alowerlevel Wed Nov 18, 2015 9:29 pm

My '73 came with 3.08s
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Post by ant7377 Thu Nov 19, 2015 11:05 am

My 73 had 2 73 's the 77 had 2 43's if I remember right.
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