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Old 07-21-2017, 10:23 AM   #1 (permalink)
augustdiesel
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Down the Road Planning: Gearing and Exhaust Options

Picked up a Dana 60 front end last night to ultimately replace my blown up 10 bolt once the 60 is rebuilt. It's geared to 3.54 and my 14 bolt is geared to 4.10. My question is which axle should be regeared? See my signature, I have a 6.5L NA, 700R4, and 305/75R16s. I'd like to find the happy medium between fuel economy and towing capability.

Then, I need to do something about my exhaust. PO put in a hacked up single 4" pipe all the way back, no muffler. This thing is LOUD. Too loud for hauling family on road trips. I'd like to quiet it down but still maintain a high flow for performance. Should I go back to dual exhaust? Maintain single exhaust? What mufflers would you recommend?

One step at a time ...


1988 K10 Suburban. 6.5L NA Goodwrench Engine: 506 block cast on August 12, 1996. Heavy Duty built 700R4. Full-floating 14 bolt rear axle. 3/4ton 10 bolt front. Brand new 305/75R16 Procomp AT Sports on brand new 16x8 steel wheels.

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1988 K10 Suburban. 6.5L NA Goodwrench Engine: 506 block cast on August 12, 1996.
Heavy Duty built 700R4.
Full-floating 14 bolt rear axle. 3/4ton 10 bolt front.
Brand new 305/75R16 Procomp AT Sports on brand new 16x8 steel wheels
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Old 07-21-2017, 11:19 AM   #2 (permalink)
1967KaiserM715
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With the R4 I would opt for the 4:10 gearing.

I would also go dual exhaust, 2 inch with some sort of trait through round muffler (not a glasspack. I picked up a dynapro muffler, haven't really run it, but I also have a turbo engine, so I would be quieter anyways.

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Old 07-25-2017, 11:34 AM   #3 (permalink)
boneheaddoctor
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Unless you run tiny tires you will likely be lugging it bad with 3.43 gears.

I have an NV4500 with 35" tires and 4.10 gears and I'm running 2,000 rpm at 65 mph. I also have a turbo, found 2 decades ago...duals on this engine don't give it the best performance. a good 2 into one system will work better....nowhere near as good as a turbo...but better than duals.

I used to have a Banks Stinger system ( a well made 2 into one system with intake breathing modifications)...noticeable improvement over stock duals..except for a horrific intake drone due to the mods that made. No longer made however.
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Old 07-27-2017, 10:31 PM   #4 (permalink)
Bigboytoys
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I'll second 4.10's a decent enough tire to make you happy with the RPM.

Best exhaust fix for ya, TURBO IT!!!

Ya, seriously, leave the exhaust till you turbo it as your gona have re d**k with the whole system again anyway sooo why do it twice.

Ear plugs are cheap anyway ....

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Old 07-28-2017, 01:19 AM   #5 (permalink)
roadhog0
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4.10's. Hell, I have em and sorta want 4.56's with 33's.....
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Old 07-28-2017, 01:19 PM   #6 (permalink)
juanfo
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4.10 is a good all around ratio.
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