Go Back   Ford Truck Enthusiasts Forums > Super Duty/Heavy Duty > Large Truck
Sign in using an external account
Register Forgot Password?


Large Truck My truck is bigger than yours. The forum for 2+ ton trucks (all years), COE's, Louisville's, Big-Job's etc.

Welcome to Ford-Trucks Forums!
Welcome to Ford-Trucks.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Ford-Trucks Forums community today!





 
Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 05-18-2010, 07:07 PM
gsalaya gsalaya is offline
New User
 
Join Date: May 2010
Posts: 5
gsalaya is starting off with a positive reputation.
f-600 4x4 1978

hi... i have a 1978 4x4 f-600 and ime triyng to put a nissan fd6t on it... but my problem is that the differentials seem to be 7:1 and with the diessel engine i think it wont go over 55mph.
Is there any overdrive ot something i can get for it?
thanks
Reply With Quote
  #2  
Old 05-18-2010, 07:34 PM
ford390gashog's Avatar
ford390gashog ford390gashog is offline
Post Fiend
 
Join Date: Jan 2004
Location: Brentwood,CA
Posts: 14,762
ford390gashog is a name known to allford390gashog is a name known to allford390gashog is a name known to allford390gashog is a name known to allford390gashog is a name known to allford390gashog is a name known to all
That engine made 95hp in its day so getting to 55mph will be test on its own don't plan on going any faster than that. The diffs if it was a marmon conversion should be 6.48:1
Reply With Quote
  #3  
Old 05-18-2010, 07:50 PM
gsalaya gsalaya is offline
New User
 
Join Date: May 2010
Posts: 5
gsalaya is starting off with a positive reputation.
the front dif is a rockwell fds 75... I spinned the wheels and i counted about 7+:1
Ime not triying to get that much speed... just think the diessel will be too loud at that speed with this ratio (about 3200 rpm)... I would prefer it to be around 2500-2600rpm... ive heared about some chevrolet spicer auxiliary gearboxes that came on series 70-80 trucks that had low-direct-overdrive gears... something like that is wath i need... but those are rare...
Reply With Quote
  #4  
Old 05-18-2010, 09:26 PM
ms_michelle's Avatar
ms_michelle ms_michelle is offline
Elder User
 
Join Date: Sep 2002
Location: Smithville TX.
Posts: 598
ms_michelle has a very good reputation on FTE.ms_michelle has a very good reputation on FTE.ms_michelle has a very good reputation on FTE.
Did you have one or both wheels off the ground when you turned the wheels?
__________________

64 Falcon Sprint convertible, 65 Ranger, 67 N 950 D
77 F 600 Roll back, 86 LTL 9000, 99 F 250 Super Duty
07 Mustang Mach I
Reply With Quote
  #5  
Old 05-21-2010, 06:33 PM
gsalaya gsalaya is offline
New User
 
Join Date: May 2010
Posts: 5
gsalaya is starting off with a positive reputation.
did it both ways
Reply With Quote
  #6  
Old 05-21-2010, 09:01 PM
ms_michelle's Avatar
ms_michelle ms_michelle is offline
Elder User
 
Join Date: Sep 2002
Location: Smithville TX.
Posts: 598
ms_michelle has a very good reputation on FTE.ms_michelle has a very good reputation on FTE.ms_michelle has a very good reputation on FTE.
Quote:
Originally Posted by gsalaya View Post
did it both ways
If you did it both ways, you should have got two different readings. If both wheels are off the ground and both wheels are turning that should give you a true count. If one wheel does not turn at any time when you are doing it, you will get a false reading. If you do it with one wheel off the ground and the other solidly on the ground then you divide by two or double it, can't remember for sure which it is. From the high reading you got I would guess that you would divide it by two.
__________________

64 Falcon Sprint convertible, 65 Ranger, 67 N 950 D
77 F 600 Roll back, 86 LTL 9000, 99 F 250 Super Duty
07 Mustang Mach I
Reply With Quote
  #7  
Old 05-22-2010, 09:48 PM
nevrenufhp's Avatar
nevrenufhp nevrenufhp is offline
Posting Guru
 
Join Date: Feb 2003
Location: Modesto, CA
Posts: 2,258
nevrenufhp has a good reputation on FTE.nevrenufhp has a good reputation on FTE.nevrenufhp has a good reputation on FTE.
7.something sounds about right to me too. No way they would have 3.50 gears in a big truck back then. How about some HEMTT 16.00X20's? A tall tire would lower the engine speed, but at 95hp, it isn't going to work. If you go to a truck wreckin yard, and get a brownie box, it may help. Some guys stick em in backwards, and get a 200% overdrive. Why such a low hp rating? Get it at a good price?
__________________
Dale.
turn up diesel fuel rate site of mine
67 F100, 300, 4spd, Offy 'C', Edelbrock 500, 274*/.518" cam, heddder.
98 Jetta VR6
82 Mercedes 300SD, fuel screw adjusted.
Reply With Quote
  #8  
Old 05-23-2010, 09:38 AM
gsalaya gsalaya is offline
New User
 
Join Date: May 2010
Posts: 5
gsalaya is starting off with a positive reputation.
with both wheels up i got 7.2:1 and with one wheel off the ground i counted 3.5:1... i think those 16.00x20 might be a solution... the engine i have is a 175hp turbo diesel nissan, and i`me going to put an intercooler to it. might get about 10hp more.
Reply With Quote
  #9  
Old 05-23-2010, 10:20 AM
nevrenufhp's Avatar
nevrenufhp nevrenufhp is offline
Posting Guru
 
Join Date: Feb 2003
Location: Modesto, CA
Posts: 2,258
nevrenufhp has a good reputation on FTE.nevrenufhp has a good reputation on FTE.nevrenufhp has a good reputation on FTE.
O, ok. That sounds better, 175 will move it pretty good. Those Michelins are approx 54-56" tall too. If you dont tow too much weight, you may be fine. Stopping is another story. Going with the trans that's bolted to the nissan? Might have an overdrive option there too.
__________________
Dale.
turn up diesel fuel rate site of mine
67 F100, 300, 4spd, Offy 'C', Edelbrock 500, 274*/.518" cam, heddder.
98 Jetta VR6
82 Mercedes 300SD, fuel screw adjusted.
Reply With Quote
  #10  
Old 05-23-2010, 10:25 AM
gsalaya gsalaya is offline
New User
 
Join Date: May 2010
Posts: 5
gsalaya is starting off with a positive reputation.
yes... ime looking for a nissan trans with overdrive... i`ve heared there are some bus trans with a overdrive at the back
Reply With Quote
  #11  
Old 05-27-2010, 05:23 AM
NumberDummy's Avatar
NumberDummy NumberDummy is offline
Ford Parts Specialist
 
Join Date: Nov 2006
Location: Hacienda Heights CA
Posts: 54,677
NumberDummy has a superb reputationNumberDummy has a superb reputationNumberDummy has a superb reputationNumberDummy has a superb reputationNumberDummy has a superb reputationNumberDummy has a superb reputationNumberDummy has a superb reputationNumberDummy has a superb reputationNumberDummy has a superb reputationNumberDummy has a superb reputationNumberDummy has a superb reputation
Quote:
Originally Posted by ford390gashog View Post
That engine made 95hp in its day so getting to 55mph will be test on its own don't plan on going any faster than that.

The diffs if it was a marmon conversion should be 6.48:1
1971 was the first year Ford offered factory installed 4WD in F600's.

The way to determine if it's factory installed 4WD is by the AXLE code found on the Warranty Plate, and/or by the first 3 digits of the VIN.
__________________
Bill / Retired Ford Parts Manager / Part number research: 1928/2001 trucks & 1928/89 passenger cars.

2013 Escape FWD 2.0L Eco-Boost
Reply With Quote
Old 05-27-2010, 05:23 AM
 
 
 
Reply

Go Back   Ford Truck Enthusiasts Forums > Super Duty/Heavy Duty > Large Truck

Tags
1600x20, 1978, 4x4, 67, box, diesel, engine, f600, fd6t, ford, gearbox, nissan, overdrive, tall, truck

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump



All times are GMT -5. The time now is 02:54 AM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup