94turbo5spd
SDD Junior Member
I got a 94 2wd,5spd,7.3 turbo, f 450 with the 73 axle.its screaming at 70 mph on the hwy.what can I do to make it run lower rpm but increase the top speed?
Question Truck won't keep up on the hwy
- Thread starter 94turbo5spd
- Start date
01yellerCobra
Full Access Member
Taller gears or taller tires are your only choices. What is the RPM?
94turbo5spd
SDD Junior Member
At 70mph,a little over or around 3000rpm,but dont need to go any faster than 75.would a complete rearend swap be a option?or easiest?
94turbo5spd
SDD Junior Member
What size taller gears?and would I be able to swap rims and tires with a newer model
01yellerCobra
Full Access Member
I would think swapping gears would be easiest. It might be worth talking to a local 4x4 shop. They should be really good at swapping gears and could give you an idea what would be the easiest route.
Welcome!
Since this is an IDI, I would recommend to go to our sister site:
www.oilburners.net
The 6.9 and 7.3 IDI section is about the best forum for these trucks.
However, with the being the F-Superduty, the highest gear is going to be 4.88:1, but more than likely 5.13:1 or lower. The F-Superduty (450) is geared this way for GVW. That speed limit is about what you would expect for one of those trucks. They will run pinned to the governor all day and be just fine. But it's not going to be a speed deamon..... Your biggest limiting factor is the Dana 80.
Once you are on oilburners, search on user towcat and F-Superduty or F-450. He ran them for years, unfortunately he passed unexpectedly a couple weeks ago.
Since this is an IDI, I would recommend to go to our sister site:
www.oilburners.net
The 6.9 and 7.3 IDI section is about the best forum for these trucks.
However, with the being the F-Superduty, the highest gear is going to be 4.88:1, but more than likely 5.13:1 or lower. The F-Superduty (450) is geared this way for GVW. That speed limit is about what you would expect for one of those trucks. They will run pinned to the governor all day and be just fine. But it's not going to be a speed deamon..... Your biggest limiting factor is the Dana 80.
Once you are on oilburners, search on user towcat and F-Superduty or F-450. He ran them for years, unfortunately he passed unexpectedly a couple weeks ago.
94turbo5spd
SDD Junior Member
Thank you guys for the help!