making a freeway cruiser - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 7 (permalink) Old 03-16-2008, 04:33 PM Thread Starter
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making a freeway cruiser

w91.5, 518, dana 70 w/3.5.

OK, with diesel now hovering close to $4/gal, I want to make my gnu CTD a freeway cruiser. My other 91, I'd get around 20 m/g. So, how to increase the overall gear ratio?

Overdrives? Any ideas? I looked at IIRC, gear vendors and their price is about what I paid for my truck. Any other ones?

The dana 70s R/P is 3.5 and that's the highest one can get for that, right?

So the only thing I can do is increase the tire size. One of the great bennies of a 2WD is running different sets of tires front and rear. Rear can even be taller due to not having to worry about turning and hitting the fenders.

Did I miss anything? Any other options? I know a guy in denver that builds 727s for bandamere drag strips, so I'm going to have him look at my 518 due to it being around 130K. He probably can beef up the rear end, but can he change the OD ratio?
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post #2 of 7 (permalink) Old 03-16-2008, 05:51 PM
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He can't change the OD ratio as far as I know.

But if you find a rear axle from a pre 91.5 truck with a 727 trans it has 3:07 rear gears in it. This would give you around 1650 RPM at 60 MPH. 80 MPH runs in around 1900 or so.

My truck has those gear ratio's. Now for the bad news. Those gears were Dodge only. You can not get replacements from any other vender. Dodge has been out of them for about 5 years now. No other gears will fit a 3:07 housing assy without major machine work. The housing and carrier assy are 3:07 only. If you find an 3:07 axle they are not cheap most of the time.

A 3:07 axle is cheaper than a aftermarket OD is.

93 W350 w/duals, fuel pin turned, 6X.018" injectors, 4" exhaust, 3" air intake horn, HX40/16, G56 /SBC Con-OFE, 307's axles' 2" skyjacker lift, B&W flatbed
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post #3 of 7 (permalink) Old 03-16-2008, 07:19 PM Thread Starter
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Looks like it's taller tires then while I scavenge the salvage yards for the "hens teeth" of r/p world.
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post #4 of 7 (permalink) Old 03-16-2008, 07:24 PM
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There is a guy on 1st gen .org that is going to be pulling a 3:07 SRW axle pretty soon. It will be for sale. He is using the truck for a donor.

Pirate 4x4 is another site that turns up 3:07 axles pretty often. Guys over there just look at the 60/70 model on the axle when they buy them. After they them they find they can't do anything with the 3:07 axles.

93 W350 w/duals, fuel pin turned, 6X.018" injectors, 4" exhaust, 3" air intake horn, HX40/16, G56 /SBC Con-OFE, 307's axles' 2" skyjacker lift, B&W flatbed
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post #5 of 7 (permalink) Old 03-16-2008, 07:58 PM Thread Starter
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Philip,
thanks for the links. I'm gonna check them out.

Once again.. :thanks:
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post #6 of 7 (permalink) Old 03-22-2008, 03:35 AM
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284 there is a guy on cumminsforum.com that just listed a 3:07 SRW axle for sale. He is in central FL.

93 W350 w/duals, fuel pin turned, 6X.018" injectors, 4" exhaust, 3" air intake horn, HX40/16, G56 /SBC Con-OFE, 307's axles' 2" skyjacker lift, B&W flatbed
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post #7 of 7 (permalink) Old 03-27-2008, 02:15 AM Thread Starter
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philip,
Thanks for the heads up. I just spent 1900 on getting my entire brake system rebuilt/replaced. And the notes from the garage is my front ball joints, etc. are bad.

Sooooo.....gonna be losing my paycheck for a while....

Once again, thanks.
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