9" rear question
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From: Levittown NY
9" rear question
I want to build up a 9" for my 79 Ranchero and it would be nice to know if it's a 28 spline or 31 spline,d axels. Bone stock at this point with a 302 FMX and a 2.75 open rear. I want to keep it running till the 3rd member 3:89 Traction-Loc is finished and just do a weekend swap out. The rear is the first of the drive train upgrades, later will be the 331 EFI and C6 with OD TIA
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Also, I learned the hard way that the 28-spline axles in my 78 are a few 1000s larger than axles from a 9" in a T-bird, and the bearings are HD rollers, not ball bearings. Learned this changing out a cracked housing. Good luck.
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From: Levittown NY
Originally Posted by fomocofan
Just look at the outside between the studs...31 splines will be flat with two little holes, 28 spline will be hollowed-out.
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From: Levittown NY
Here's another odd thing
I'm building this up from my parts stock. The only good Tract-Loc cover I had was for 1.78 ID bearings. no problem as I had a G case in stock that takes the matching 3.06 OD carrier cup. here is the rub??? Even though the carrier uses the larger bearing ID, a 31 spline axel won't go through the carrier, only 28 will?????
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From: KS
it's probaby a little too late, but I just came across this post. When I was rebuilding my 9", my axles looked the part of a 31 spline; fit all the descriptions. But of course I took them out and even counted them...28 spline. I have heard of a lot of similar cases since then.
By the way, I ended up putting in an Auburn Gear Pro series; drives like a locker, turns like an open. Also put in Richmond 3.70 gears (with 275/60R15 tires to turn). This goes behind my 350 hp 302 w/ TCI C4 tranny (I still have the 2.75 open diff. & FMX tranny sitting in the garage just in case...). Anyway, it's a good move changing out that rear end, that is unless you're planning on highway driving. Have fun!
By the way, I ended up putting in an Auburn Gear Pro series; drives like a locker, turns like an open. Also put in Richmond 3.70 gears (with 275/60R15 tires to turn). This goes behind my 350 hp 302 w/ TCI C4 tranny (I still have the 2.75 open diff. & FMX tranny sitting in the garage just in case...). Anyway, it's a good move changing out that rear end, that is unless you're planning on highway driving. Have fun!
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From: Levittown NY
Thank you for the reply
and I'm glad I get the email heads up when an answer is posted. My planned build up will be a slow one since I'm old and pretty crippled up from a tough "paper route" as they say. The chunk shown below will be finished tomorrow it's a 3:50 tract-lok big bearing G case and 28 spline. Next to build is a C6 I have hanging around and it will get the wide ratio package along with a Gear Vendors O/D. For power I have a good running 89 5.0 HO that I'l tear down for an inspection and add the new cam? and the new GT40P heads I already have. On top of the 5.0 I may shot the lock off the wallet and get the Mass-Flo EFI system since I've come to like FI over the years.
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