12th Feb 2006, 19:15

I have a 91 with 210,000 miles. Max mpg is 23.5 with 2wd, 5 speed. I also had a 93 350 DRW with same specs and got 21 mpg with that truck. No offense, but 27 mpg??? I did lower control arms @ 200,000 miles. Engine still runs like new. I used to think this truck was powerful until driving these new electronic motors with over 300 hp and 600 ft/lbs. When towing a heavy trailer (over 10,000 lbs), I wish it had an extra gear between 3rd & 4th. Or perhaps a 2 speed rear would help. No rust on mine. People always ask what year it is. Looks like new.

25th Apr 2007, 21:45

I'm worried about my 91 Ram diesel automatic transmission with overdrive. I've heard some horror stories. Any comments on how to protect my trannie?

25th Aug 2007, 00:44

I recently purchased a 1991 dodge d250 with the cummins and let me tell you these are the best diesel on the market for the age and mileage. I would recommend them to anyone. This truck runs like new and has over 260,000 miles on it and still gets 22.5 mpg.

10th Oct 2007, 20:35

October 19, 2007 I own a 1993 and a 1991 1ton and a 3/4 ton dodge with a cummins. I get around 23-25 mpg. I have a bosch fuel pump with the marine injectors. It is a monster if you need it to be. It is nice to own a real truck and not a grocery getter. Is there anyone else who has the marine injectors? What say you?

15th May 2008, 15:46

OK so I am curious how you get 27 mpg???

27th Oct 2008, 23:00

I have a 1991 5spd and am running it stock, and am getting 22mpg... does Banks make anything for a 91, and what's the best way to turn it up?

29th Jun 2009, 23:35

Does anyone know where I can get parts for a 91 Dodge diesel?

18th Oct 2009, 19:39

I have a 1991 2wd Dodge with the Cummins. It doesn't have an OD trans, but it does have 308 gears. It also has 224,000 miles.

I changed the turbo housing to a 14cm, removed the muffler and put Ex. to rear with only 3", and installed a K&N air filter and it runs 25-26mpg if I say under 60mph. And 26-28mpg if I use biodiesel. It will still pull a big trailer, but the auto trans is not that great, but it will still get 17-18mpg when pulling the trailer. Motor is the best thing about the truck.

Also, do not lean against the body; it will dent very easy.

18th Dec 2009, 18:57

My 91 D-250 has a 5.9 gas with O.D. trans. She's not the prettiest but is unstoppable. 302,873 miles.

Original engine, trans rebuilt at 215,000. Gooseneck & Fifth wheel and bumper pull hitches. 4:10 Dana 60 out of a 76 Power Wagon.

I call her Timex. Takes a lickin keeps on Tickin.

Shes even been down the 1/4 mile at an amazing 14.2 with 290,000 miles!

Hail Mopar!

27th Nov 2010, 16:19

My 91 D250 with Cummins has 330,000+ and runs like a Swiss watch. I turned the pump screw a little, and was amazed at the difference in power.

I did replace the the autobox at 260 or so, but the reason was my fault. My son replaced his at about 240 or so, as it just QUIT. Mine has had to pull some HEAVY loads once in a while with no problems. Trailer brakes are a nice thing to have however.

I keep up with service, use Valvoline diesel 5-40 synthetic, use fuel additive at every fuel-up, and use it as a daily driver. The open exhaust makes some rude sounds, but all outside.

All in all, in the 7 or 8 years of ownership, I have enjoyed the truck. I expect to be able to run to 700K with nothing major. :-)

If I do need another one for any reason, it will be a 12 valve unit.

31st Dec 2012, 19:15

I get about 27-30 MPG with my 1991 5.9L. Mine is also a 5 speed manual. Sometimes it's just luck of the draw.

20th Jul 2014, 17:20

Buy a manual transmission. Or an aftermarket Billet or so auto transmission.