89 f-350 7.3 gearing - PowerStrokeNation : Ford Powerstroke Diesel Forum
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 03-07-2017, 12:06 AM Thread Starter
PSN Newb
Join Date: Mar 2017
Posts: 1
89 f-350 7.3 gearing

I just recently purchased a 89 f-350 7.3 2wd crew cab dually, it has the c6 transmission and 4:10 gears in the back. I got this pickup for 1600 which I think is more than fair considering it only has around 120xxx miles.

When I'm driving down the highway at 55 the truck runs around 2500rpm and about 2700+ at 65. I hear the c6 is a good transmission and is good for towing, which I will be pulling a horse trailer in the summer time, but I don't like driving with my truck wound up so high just driving down the road. I've looked into an aux overdrive unit but not looking to spend quite that much just yet. If I pick up a cheap zf5 or 6 how hard of a swap would it be and what would my rpms be at crushing speed? And will I loose my towing capability if I swap?

Lanemac is offline  
Sponsored Links
post #2 of 3 (permalink) Old 03-07-2017, 12:58 PM
alleged moderator
tjctransport's Avatar
Join Date: Jul 2009
Location: in a loony bin in N.J.
Posts: 7,573
Re: 89 f-350 7.3 gearing

a zf will drop cruising RPM's around 500 RPM at 55MPH.
my 88 7.3 with C6 and 410 gears will do 80 MPH at 3300 RPM governor shut off..

owner of almost to many fords.

If you want the moral high ground, make sure you're not standing on a hill of horsecrap.
tjctransport is offline  
post #3 of 3 (permalink) Old 03-07-2017, 01:49 PM
PSN Veteran
Join Date: Apr 2013
Location: south of Houston
Posts: 608
Re: 89 f-350 7.3 gearing

maybe re-gear the rear end instead.

1996 F350 Crewcab lb 2wd auto, tommylift, now over 451k, 355k 3/31/15

1991 F250 Xtracab lb 2wd auto, sold again! Driveline and chassis is under a '65 F350 cab

1965 F100 styleside, power brakes, front discs, 390 all the goodies
2015 F250 CCSB 2wd gasser auto
2008 Mustang WIP, warriors in pink, wife's
2009 Focus, son's
aussamdad is offline  

Quick Reply

Register Now

In order to be able to post messages on the PowerStrokeNation : Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome