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post #1 of 8 Old 10-21-2019, 08:43 AM Thread Starter
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89f350

Just picked up an 89 f350 dually. 7.3 5 speed. What is easiest fix to get higher speed at lower rpm? Change rear gears? It has a Dana 80. Just seams to be screaming at 55 mph. Tach does not work
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post #2 of 8 Old 10-21-2019, 09:12 AM
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gears make a big difference. whats in their currently?

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post #3 of 8 Old 10-21-2019, 09:26 AM Thread Starter
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I haven’t been able to figure that out yet no tag on axle.
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post #4 of 8 Old 10-21-2019, 10:45 AM
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Door tag or internet search would tell

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post #5 of 8 Old 10-23-2019, 09:30 PM
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Jack the rear end up so you can spin the rear wheels. Tranny in neutral. Mark the driveshaft with a chalk mark. Spin the tire one revolution and count the number of times the driveshaft rotates. Driveshaft rotates 3 1/2 times you have 3.50 gears. 4 times and you have 4.00 ratio. Etc.

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2014 XLT Premium CC Dually 2WD, Remote Start Added, Diesel Site Dual Filters, Rudy's Cold Air Pipe, Infotainment Radio Swap + Rear Camera Added

2002 XLT CC Dually 2WD, 6 Spd, True Workhorse that kept going.

1999 F250 Lariat CC LB SRW 2 WD, Automatic. Just didn't perform towing.
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post #6 of 8 Old 10-29-2019, 06:24 PM Thread Starter
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So I jacked up rear end and drive shaft spun 2.5 turns. Does that mean it as a 2.5 gears? Never heard of that low. And doesn’t help me change gears to drop rpm?!?
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post #7 of 8 Old 10-29-2019, 07:52 PM
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Quote:
Originally Posted by Krobinoldschool View Post
So I jacked up rear end and drive shaft spun 2.5 turns. Does that mean it as a 2.5 gears? Never heard of that low. And doesn’t help me change gears to drop rpm?!?
It wouldn't be 2.50. My guess is it turned 3.5 times. Make sure you rotate the wheel one full rotation. I normally use the valve stem and start with it down at 6 o'clock. A chalk mark on the driveshaft makes it easier to see.

Tom

2014 XLT Premium CC Dually 2WD, Remote Start Added, Diesel Site Dual Filters, Rudy's Cold Air Pipe, Infotainment Radio Swap + Rear Camera Added

2002 XLT CC Dually 2WD, 6 Spd, True Workhorse that kept going.

1999 F250 Lariat CC LB SRW 2 WD, Automatic. Just didn't perform towing.
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post #8 of 8 Old 11-17-2019, 05:24 PM Thread Starter
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So it has 5:13 gears in it, what are my options for lower gears? Any good aftermarket stores?
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