Quote:
(8.75 is 5x4.25)
****************************************
And just where did you get that info? 8.75 rears from an A-body are 5-on-4" pattern, and B-body rears are 5-on-4.5" pattern.
Roger
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| Rear end gear? https://slantsix.org/forum/viewtopic.php?t=59936 |
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| Author: | bigcasey123 [ Sun Jul 24, 2016 8:48 pm ] |
| Post subject: | Rear end gear? |
Okay so I have a 69 dart 225 /6. I am thinking that in the future I am going to put some power in it so I would like a nice platform to build on. I'm starting with upgrading the rear end. I've already done some other upgrades such as breaks, gas tank, spark plugs, etc. all maintenance/necessary upgrades so it's drivable now. I'm planning on getting an 8 3/4 rear end as of now. I have a little over a grand set back for it now. So my question is where is the best place to get the rear and what gear ratio should I get. Right now i have very few/mild performance upgrades. 2bbl carb. New plugs and wires. Electronic ignition. And very soon exhaust. Basically stock power. But in the future I am planning 300+hp. I would like a gear good for both set ups. This is also a daily driver. I was thinking 3.23s. My tires are slightly taller than stock in the rear about 27 inches. I was just wondering if that gear is good enough to possibly chirp a tire and get off the line but also keep the revs low on the highway and get decent gas mileage. Thanks for the help |
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| Author: | Dart270 [ Mon Jul 25, 2016 4:20 am ] |
| Post subject: | |
3.23 is a great choice. I suggest getting a "clutch type" sure grip limited slip, or if you have extra cash to get the TrueTrac type. Doctordiff.com is a great source for 8.75" axle parts and assemblies. Best, Lou |
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| Author: | bigcasey123 [ Mon Jul 25, 2016 5:33 am ] |
| Post subject: | |
Thanks for the help Lou. I'll check it out |
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| Author: | Doctor Dodge [ Mon Jul 25, 2016 7:04 am ] |
| Post subject: | |
Spend some time with one of many on-line speed / RPM calculators, to get a better "feel" for the final drive RPMs each ratio will get you. https://www.ringpinion.com/calculators/Calc_RPM.aspx It is time to install a tachometer in the vehicle, if you do not currently have one. DD |
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| Author: | bigcasey123 [ Mon Jul 25, 2016 7:50 am ] |
| Post subject: | |
I really think the 3.23s will work. Now do you think it's possible to get a used 8 3/4 sure grip for $1000 or in that range. It doesn't need to be race ready or anything just good enough to hold 400 ft lbs of torque or so on a daily driver. |
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| Author: | sandy in BC [ Mon Jul 25, 2016 9:40 am ] |
| Post subject: | |
With that kind of budget you might consider an Explorer 8.8. You get Trac Loc and Discs, lower weight .....and change. |
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| Author: | bigcasey123 [ Mon Jul 25, 2016 10:21 am ] |
| Post subject: | |
The explorer 8.8 sounds like a good idea. How much fab work is needed to drop in the rear end. And where can I find one. |
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| Author: | Reed [ Mon Jul 25, 2016 10:23 am ] |
| Post subject: | |
Quote: With that kind of budget you might consider an Explorer 8.8. You get Trac Loc and Discs, lower weight .....and change.
+1. 8 3/4 rear ends are expensive and hard to find these days. Explorer rear ends are almost a bolt in and offer many benefits over the 8 3/4. Purity is the only reason to insist on the 8 3/4 axle. If I were in the market I would skip the vintage A body axles and go straight for the Explorer axle.
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| Author: | bigcasey123 [ Mon Jul 25, 2016 10:28 am ] |
| Post subject: | |
Thanks for the help. Do you know if they make 3.23 gears for those rears. Bc I think I heard they come with 3.73s. And where is the best place to get one |
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| Author: | sandy in BC [ Mon Jul 25, 2016 2:27 pm ] |
| Post subject: | |
You can get one in any wrecking yard,,,,they have a wide variety of ratios. from 3.23 to 4.11 They are not boltin. They need to be narrowed and they need new spring mounts welded on. I paid: $350 for a 3.55 ratio V8 rear end (Spauldings in Spokane) $ 60 for a short side axle (Spauldings) $100 to have the long side of the axle shortened and the new spring mounts welded (local machine shop) $20 for new spring mounts (Summitt racing) The whole shebang weighs 20 lbs more than a 7.25 (lots less than a 8.75) They are 5x4.5 bolt pattern (8.75 is 5x4.25) |
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| Author: | bigcasey123 [ Mon Jul 25, 2016 2:32 pm ] |
| Post subject: | |
Okay thanks I think that's what I'll do. |
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| Author: | sandy in BC [ Mon Jul 25, 2016 2:41 pm ] |
| Post subject: | |
http://www.slantsix.org/forum/viewtopic ... les+bawdys |
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| Author: | Rick Covalt [ Mon Jul 25, 2016 5:42 pm ] |
| Post subject: | |
Casey, You could also look for a 8 1/4 out of a later A body and that would be a bolt in. Of course you need to shorten the driveline. You may want to get a plan together for doing the big bolt disc brake swap up front. It is a huge upgrade safety wise and then the 8.8 or an 8 1/4" would have the 4.5" bolt circle to match the front. Rick |
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| Author: | Reed [ Mon Jul 25, 2016 6:22 pm ] |
| Post subject: | |
Quote: Explorer rear ends are almost a bolt in
The key word there being *almost*.
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| Author: | GTS225 [ Mon Jul 25, 2016 6:50 pm ] |
| Post subject: | |
Quote: (8.75 is 5x4.25)
**************************************** And just where did you get that info? 8.75 rears from an A-body are 5-on-4" pattern, and B-body rears are 5-on-4.5" pattern. Roger |
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