Synthetic Gear Oil - Yes-No?

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Is the synthetic gear oil worth the extra cost? Cooler running and increased mileage claims sound good. Any truth?

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Stock 92, 5sp LE, 4WD, 4. 10 gears, std cab, 178K miles, 50 gal aux. ,more to come

 

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To be honest can not comment on the increased mileage, But I did see on avg. 90 degree drop in my rear end temp. After shelling out $1280. 00 for a rebuild. I tried it. I still will change it at 1 month which is 12,000 miles for me. I could care less about the cost I make my living with this and my new FL-70. May not seem like much to you all but 90 degrees is 90 degrees. Just my . 02 worth Mike

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92 Std cab. LE. 210,000, 5-speed, 3. 54, 105 gal Aux tank in bed. Banks Power pack. 14cm 4" exh. w/wastegate. Pyro & boost guage, oil temp guage. Rebuilt pump turned up, fresh injectors. E-brake. Used as a Hotshot/express Reg. at 36,000 lbs in 48 states. http://hometown. aol.com/hotshothauler/myhomepage/business.html

 

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Hi SturgeonMike,

Four Wheeler Magazine, September 1999, had part 3 in a four part series called Project MPG, in which they tested different modification to improve performance and mileage on a 1988 Dorf F350 4x4 Centurian Dualie Bronco conversion with a 460. Granted, there is a lot different about that truck, but what I think what is relevant is this: When they changed the fluids to Torco synthetic gear lubes and engine oils and Pro-Blend additives in the engine, trans, radiator,transfer case, diffs, the following happened:

10-60 acceleration dropped from 14. 11 to 13. 69 seconds

City mpg improved from 5. 9 to 6. 1 (ouch!), but that is 3. 3%.

Hwy mpg improved from 9. 6 to 9. 9, 3%.

Rear wheel horsepower up from 200 to 206.

Rear wheel torque up from 386 to 387.

They even included a column for number of miles to pay for the upgrade, based on mpg improvements and the gas prices a year ago - in this case 38,991 miles. That doesn't include, of course, reduced wear on parts due to lower heat.

They did an amazing job ensuring outside temperatures, wind conditions, and driving the same highway/city loops to keep the baseline as close as possible, fascinating article. Some of the best improvements were not due to exhaust and intake mods - they were things like a cooler thermostat (8% torque gain), wrapping intake air with Design Engineering Cool Tape (3% torque gain), fuel regulator (11%). K&N was only 2% and headers were only 1. 5% torque and 5% horsepower.

Sorry to digress a bit, but I felt folks could extrapolate and with very few $$$'s get even more gains out of their rigs.

thanks, jon.

 

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Swap Ferd 460 for old Dodge with cummins. Put $5000 in pocket and achieve 50 - 100% improvement in economy and life.

Where was this in the article?

HAHAHAHAHA

 

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I had a 92 Dodge/Cummins with a 5 spd. Getrag. Went through 3 trannys by 61k miles. The 4th one had synthetic gear oil put in it at 69k miles. It is still going fine at 130k miles. This was a recommendation of the transm. man at the DC dealer in Stoney Plains, Alberta. He put the synth. in for me.
I highly recommend doing it.

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98 24v,3500,4x4,quadcab,5 spd,3. 54,all options available when ordered,oem full length diamond plate running boards, eyebrows & hood dam, bed edges,bedhooks plus Rhinohide liner, Pacbrake, britebox,"deepdish"mats, matching topper shell, Sandstone & camel leather, stainless fender eyebrows, chrome exhaust turndown pipe.
Lowered rear end 4" to set truck level. brush guard.
SPA digital boost/egt gauge and pillar mount coming for fathers day present from two sons, both with Dodge/Cummins, a 92 & 01.