willoland

On the 5 speed manual 12 valves you hit a top speed of about 110 MPG which will put you at an uncomfortable RPM at 80-85mph. I’m wondering how to get a little more out of my truck.. It has plenty of power to take a lower gearing. I was thinking a ring and pinion? 6 speed trany?


-William

signature600

What???


Could you explain what you'd like a little better?
Thanks,
Chris

Kemble

I think he is trying to lower his cruising rpm's at 80-85 miles per hour?

gunracer1

gear vendors or a dana 70 with 3.08 gears from a early non overdrive cummins first gen. or just a 4k rpm kit, mine will do 140 easy.

signature600

If you're trying to lower your cruising RPM...higher gears, or an aftermarket OD. A 6 speed won't do it!

If you're trying to go faster, a 3K or 4K governor spring kit will do the trick!

Chris

willoland

For lower crusing RPM the cheaper way to go would be new gears ha?

gunracer1

they don't make any lower gears to speak of. you can get 3.23s for a dana 80 and 3.55 is as low as they go for a standard dana 70

greenworks

WOW I could handle 110 MPG, I could fill up once a month

Teddy Bear

Keep in mind that if you change the ratio of the rear axle, you will need to do the same to the front one so the 4wd will still function properly

9512vCTD

Im in the same boat i have 4.10 gears and hate them im at 1900rpm only going 65mph so to run 75 which is decent for interstate it runs really high which i dont like doing either..

DZLPWR

Hey if you get 110mph your doing pretty good. Get bigger tires?

Kemble

My truck runs 100.2 MPH flat on the floor, or at least that is what a buddy of mines GPS said. with 3.55 gears and stock govenor springs.

Teddy Bear

A governor spring kit will help you out big time! Makes the trucks a lot better to drive IMO.

cumminsdriver635

My dads stock 98 5 speed with go 100mph runnin for all shes worth. I have had mine to 105, and still pullin according to the speedo, but it is off probably 5mph or so since I have 285's, and it had 245's stock. An automatic will get you a lower rpm on the intersate. O/D in the auto is .69 to 1. Im only turning like 2k rpm's at 80mph.

Eric