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Post by oldsproject on Nov 18, 2009 11:21:16 GMT -5
Looking for opinions and advice. I'll be getting my 65 Cutlass back from the paint shop around Thanksgiving. It's basically a "No Frills" Cutlass with few options. I converted it to floor shift, will probably add power brakes and maybe power steering as I have the extra stuff. Thats about it though. I changed the tranny to a TH350 (no-stall) and put in a 425 bored .30 over from a 67 dynamic. The motor rebuild we did ourselves to the following specs: Crank - Steel Forged and Balanced Pistons - Egge 10.25:1 Rings - Federal Mogul Sealed Power (file gapped) Heads - C with valve job but no porting (increased compression by using a thinner head gasket - .051) Valve Train and springs - Comp Cams Mag Rods, Mag Lifters, Mag Rockers, Guide Plates, BeeHive Springs Cam - Mondello JM 20-22 Replaced turkey tray with a valley tray Oil Pump - standard but increased return oil flow per Mondello specs Moly Strap reinforcements on main bearings with ARP studs. Intake - Edelbock Performer Carb - Edelbrock 750 CFM MSD plug and play Ignition Exhaust Manifold - Hooker Comp Headers Exhaust - 2.5" Flow Master with cross over pipe The intent was to have a good solid street machine and not something for the track. Given where I am, I'm begining to see ghosts with the 10 bolt 8.2 differential. It's a peg leg now but will eventually convert or swap to a posi. If I convert it, will it hold up (has 3.08's now) under heavy street use and what can I do to make it more bullet proof than what it is? Or should I even worry
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Post by bubbasz1 on Nov 18, 2009 20:03:43 GMT -5
Personally if it were me, which it isn't I would put my money in a ford 9 inch if my trusty 10 bolt failed. That is what I intend for my convertible when I can afford to get to that point in it's life.
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Post by BR[] on Nov 18, 2009 20:15:56 GMT -5
He's a friggin' ford man............can ya tell?
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Post by oldsproject on Nov 18, 2009 23:26:47 GMT -5
What about a 10 bolt 8.5? Research says they are about as stout as a 12 bolt and obviously much more common as GM used em for years in the 70's. Also will the 8.5 insides fit into the 8.2? I think I read somewhere where the axles are the same
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Post by BR[] on Nov 19, 2009 7:51:45 GMT -5
If you are going to beat the hell out of it........go to the 9" Ford (and the easy change punkin is handy) I have several 9" carriers for my drag car with gear ratios up to 5:13. If you are going to street drive it and maybe jump on it every once in a while the 10" will hold up just fine. Don't over think it.
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Post by Deleted on Nov 19, 2009 8:31:45 GMT -5
I had a very similar combo to you (except I had a 455), same cam, similar parts and a 4 speed and I started to chew up my 3.55 8.2 with it. 8.2 and 8.5 are different. You could easily build a 8.5 Chevy ten bolt to hold up, but 73-up rear won’t bolt in.
You have a few options here...
You could keep it olds and find a type-o 12 bolt with the shorter length out of a 67, that would be the same width as the 64-65 rear, or you could get one out of a 68-72 that would be 1” wider, but will bolt in.
You could find a Chevy 12 bolt 66-67 are the same length as a 65, or once again 68-72 are 1” wider. These are more available and cheaper to build than a type-o.
And then there is the Chevy 10 bolt. For what you are doing right now, you could get one that would hold up. They are the most available and the cheapest to build.
Brian Trick out of Erie, PA builds a lot of rearends for people. He is very good and I am sure he could answer all your questions and also build you a rear. This is his email:
thetrickfamily@yahoo.com
Or you could put a 9” under it. I went with a 9”, but a twelve bolt would probably hold up. 9” rears are heavier, and they take more horsepower to turn, but they are tough.
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Post by Deleted on Nov 19, 2009 9:31:50 GMT -5
go with the Ford 9". Unless you are restoring a #'s matching 442. The 9 inch with a disc break upgrade will be the overall best choice. Plus....all's it would take is to blow up the 10 bolt once and you are back to re-thinking your decission and laying out more money. So, if it were me, run the peg leg until it blows up and put the money into the ford 9 inch.
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Post by Deleted on Nov 19, 2009 13:51:13 GMT -5
I have a 9" in mine. But I always overkill my equipment.
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Post by oldsproject on Nov 19, 2009 15:36:47 GMT -5
Will the 9" Ford just bolt in or modification needed? Also are there specific years to look for? Unfortunately I need a little more education about the 9" ford.
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Post by Deleted on Nov 19, 2009 15:54:11 GMT -5
They can be ordered for GM A Bodies. I would go with a detroit locker and 31 spline axels. Moser make a complete turn key set up ready to install with disc brakes and an E-brake.
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Post by Deleted on Nov 20, 2009 1:13:54 GMT -5
DTS built mine. Detroit Locker with 35 splines.
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Post by oldsproject on Nov 20, 2009 10:04:07 GMT -5
Thanks guys, given that it's the holidays and I just placed a big order for the frame on my next project , think it's probably best to stick with the peg leg for now and save up for the 9" next summer.
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