1986 diesel
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Senior User
Joined: Dec 2009
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1986 diesel
Hey i'm looking at a truck. I have a few questions
Do 6.9 have as much ***** as 7.3??
Does it have a t18 or t19?? And are they stronger than a ZF??
Is 1986 one of the better years for a 6.9??
thanks
Do 6.9 have as much ***** as 7.3??
Does it have a t18 or t19?? And are they stronger than a ZF??
Is 1986 one of the better years for a 6.9??
thanks
Post Fiend
Joined: Feb 2009
Posts: 8,005
Likes: 7
From: Ottawa, Ontario
6.9 and 7.3 have no noticable differents in power.
6.9 has 170HP @ 3300RPM
7.3 has 180HP @ 3300RPM
I think it's the T19 (not sure) someone will chime in with the sure answer. And either one are much stronger than the ZF5, the ZF5 is alluminum and the T19 is all cast-iron. Dave Sponaugle has a 4 speed with over 450,000 miles on it, with nothing done to it!
The best years for the 6.9 was 1986 and 1987.
6.9 has 170HP @ 3300RPM
7.3 has 180HP @ 3300RPM
I think it's the T19 (not sure) someone will chime in with the sure answer. And either one are much stronger than the ZF5, the ZF5 is alluminum and the T19 is all cast-iron. Dave Sponaugle has a 4 speed with over 450,000 miles on it, with nothing done to it!
The best years for the 6.9 was 1986 and 1987.
Cargo Master
Joined: Oct 2008
Posts: 3,330
Likes: 13
From: Eaton, CO
It's got a T-19 4-speed manual transmission. The T-19 has a synchronized granny gear and the T-18 doesn't (I think).
Fuel economy will vary with the gearing in the axles. I have 4.10 gears and a T-19. I went ~260 miles on 3/4 of one tank of fuel at 55mph tacking 2450RPM in 4th gear. I don't even know how big the fuel tanks are in these, so I didn't calculate the fuel economy.
Fuel economy will vary with the gearing in the axles. I have 4.10 gears and a T-19. I went ~260 miles on 3/4 of one tank of fuel at 55mph tacking 2450RPM in 4th gear. I don't even know how big the fuel tanks are in these, so I didn't calculate the fuel economy.
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Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
How you drive it and where you live has more to do with MPG than the gear ratio does.
Drive fast, jack rabbit starts and live in the mountains, probably 11 MPG.
Drive slower, take off like you have a week to get somewhere and live in flat country, 15 to 17 MPG.
7000 pound vehicles are not the best choice for fuel economy.
Drive fast, jack rabbit starts and live in the mountains, probably 11 MPG.
Drive slower, take off like you have a week to get somewhere and live in flat country, 15 to 17 MPG.
7000 pound vehicles are not the best choice for fuel economy.
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Post Fiend
Joined: Oct 2007
Posts: 10,501
Likes: 5
From: Faibanks Ak.
Then you figgure going straight up half the time. Both takes horsepower and that equals fuel. lol
