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6.9L Diesels Technical discussion of topics related to vehicles powered by the 6.9 Liter In-Direct Injection Navistar engines.

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Old 01-13-2007, 10:28 PM   #1 (permalink)
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4 speed cruising RPMs

Ok out 7.3 had a cracked block so we went out and bought a 6.9. My question is will this thing be revving quite a bit more at 55mph than the 5 speed? What RPMs are you guys usually running?
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Old 01-14-2007, 08:59 AM   #2 (permalink)
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Re: 4 speed cruising RPMs

Final drive gear (rear differential) will determnine your cruising RPM. The 5 speed in OD drops RPM's like 20%, so if you were turning 1800 at 55 in 5 spd od, then you will be turning 2100 to 2200 (1800 x 1.2 = 2160) with the 4 spd. If you have the 5 speed, why not use it with the 6.9 as well?
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Old 01-14-2007, 09:33 AM   #3 (permalink)
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Re: 4 speed cruising RPMs

7.3 is going back to the owner and were getting our money back, otherwise YES I would definatly swap it over. thanks
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Old 01-14-2007, 12:26 PM   #4 (permalink)
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Re: 4 speed cruising RPMs

????? What difference does it make whether you have a 6.9 or a 7.3 when it comes to the transmission?

If you go to www.ringpinion.com there is a chart that will tell you all you want to know about different gear and transmission combinations.

Jim
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Old 01-14-2007, 05:34 PM   #5 (permalink)
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Re: 4 speed cruising RPMs

[ QUOTE ]
7.3 is going back to the owner and were getting our money back, otherwise YES I would definatly swap it over. thanks

[/ QUOTE ]

Is the tranny going with it? 5 speed that is? If not, you can make it work, you just need the correct flywheel etc which you would already have on the 7.3 or you could buy a dual mass flywheel conversion unit and there are other potential ways of doing it, but I would not give up the 5 speed if you can keep from it.
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1987 F250 6.9 4X4 - T19 Trans, 4.10 Dana 60 Front/Ford 10.25 rear, Dual Rear Wheels, Carter P4594 electric fuel pump, Restrictive air filter opened up, Firewall repair kit installed, new clutch m/cyl and pedal bracket, bushings etc.,7.3 fuel filter conversion, Solid state controller OEM (new controller and Motorcraft GP's), Headlights converted to relay system with 65/100 Watt Cold Ice bulbs, Class V Hitch (10,000lb WC/15,000lb WD), Air Horns, Cadet 7' X 9' flat dump bed, 5 ton grainmaster dump hoist.
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Old 01-15-2007, 06:09 AM   #6 (permalink)
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Re: 4 speed cruising RPMs

yeah the whole thing is going back thats my point, I cant just rob what I want and return it
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Old 01-15-2007, 09:42 AM   #7 (permalink)
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Re: 4 speed cruising RPMs

[ QUOTE ]
yeah the whole thing is going back thats my point, I cant just rob what I want and return it

[/ QUOTE ]

I guess I am/was a little confused, just thought the motor was going back, bummer, that 5 speed would be cool.
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