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Author Topic:   6.5 diesel
BiggerBill
Dirt Maniac

Total posts: 129
posted February 17, 2005 02:35 PM  
Are the GM 6.5 diesel engines good motors? With regular maintenance do they usually last a long time, say over 250K miles?

[This message has been edited by BiggerBill (edited February 17, 2005).]

Blackgold
Dirt Full Roller

Total posts: 71
posted February 17, 2005 05:29 PM  
I had a 6.5 turbo diesel in a 93 Chev PU and it ran about 280K and then the crank broke near the front. Either just behind the timing chain or in that area. I had a dampner go bad and it was run with the outer ring loose for longer than it should have been before being replaced. I think that this probably shortened the life of my crank. Had very little trouble with engine other than this. They're not as powerful as some of the others, but they will tow OK. We pulled a Bomber a lot of miles with it at interstate speeds with it . Also pulled a 24 ft cattle trailer that weighs about 20,000 Lbs. full. Some hills would slow it down with this load, but not really too bad.

jammin
Dirt Administrator

Total posts: 6243
posted February 17, 2005 06:34 PM  
Thanks guys.

77k
Dirt Maniac

Total posts: 174
posted February 27, 2005 01:22 AM  
A buddy of mine has a 7.3 power stroke.It will out pull my 6.5 and get better milage.

BiggerBill
Dirt Maniac

Total posts: 129
posted February 27, 2005 06:59 AM  
The Dealer told me wrong, its got a vortec 454 in it, boy its got some snap when you go to pass someone on the hiway. 11.5 mi. a gallon.

Blackgold
Dirt Full Roller

Total posts: 71
posted February 27, 2005 10:27 PM  
Bigger, that will be a real trailer puller. After the crank in my 6.5 broke we put a '93 Towanda FI 454 in it's place. Pick-up already had 4.10 gears and the 4L80 overdrive trans. Don't know how fast it will run, but it will hide the speedo pulling my stock trailer. Fuel mileage is in that 11-13 mpg range, if you take it easy. If you want to use the horses though, you have to feed them.
Fun PU to drive!!

TEAMPCR
Dirt Freak

Total posts: 238
posted March 04, 2005 10:39 AM  
Take the 4L80E out of overdrive when you're pulling the trailer. Not enough fluid circulation when the convertor locks up, unless you have some rework done on it. 4L80E is high dollar to replace. (or so I have been told)

I have 7.4l (454) vortec in my Subarban and I absolutely love it. Big blocks are cool.

rrrrick
Dirt Maniac

Total posts: 192
posted March 04, 2005 10:55 AM  
I had 115,000 miles on my 454 dually when over drive went out. I towed in overdrive all the time.
Any of the new transmissions are very expensive to fix
Chevy 4L80E was about $1200.00 to replace
Ford trans behind the 7.3 is around $2000.00 ( 100,300 miles before transmission failure)
my new ford had a whooping 1300 miles on it before the transmission failed
I am however towing a 44' trailer with these vehicles


TEAMPCR
Dirt Freak

Total posts: 238
posted March 04, 2005 11:14 AM  
I haven't been brave enough to try it in O.D. I had a guy tell me about the tranny, who has worked for chevy dealers for the last 25 years or so, and been in the auto service business since the mid-50's. I figured he knew a helluva lot more about it than I do.

Blackgold
Dirt Full Roller

Total posts: 71
posted March 04, 2005 06:33 PM  
I replaced my 4L80 at about 220,000 miles with the 6.5. I was told that it was OK to tow in OD as long as the transmission didn,t shift up and down alot or the converter didn't lock and unlock alot. The only time that I ran in drive was when pulling a heavy trailer where there were lots of hills. Unless you're pulling a large or really heavy trailer you should be OK in OD. JMO With the 6.6 Turbo engine, my mileage dropped of considerably if I ran in drive and cranked the rpm necessary to run 65-70 mph.

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