5 Speed Tranny for 390?? - Ford Truck Enthusiasts Forums



1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

5 Speed Tranny for 390??

Reply
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 11-28-2010, 10:32 PM
68Ford4Life's Avatar
68Ford4Life 68Ford4Life is offline
Senior User
Thread Starter
 
Join Date: Nov 2010
Location: North Carolina
Posts: 214
68Ford4Life is starting off with a positive reputation.
5 Speed Tranny for 390??

So I've been looking and I can't find what I want to know. Is it possible to get a 5 speed transmission for my 68 Ford F-100 with a 390FE? I currently have the original 3-speed automatic transmission and I'm only gettin 7 miles per gallon. I was hopin to get a 5-speed stick...any help?
Reply With Quote
  #2  
Old 11-29-2010, 02:29 PM
TigerDan's Avatar
TigerDan TigerDan is offline
Super Moderator
 
Join Date: May 2004
Location: The hills of No. Calif.
Posts: 12,163
TigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputation
Not as a straight bolt in...you'll probably have to get an adapter of some sort and plan on doing some modifications to make it all work. A lot of 5-speeds (like the ZF) have integral bell housings and none of those were ever made to fit the FE block.

But 7 MPG out a a 390 in an F-100 is pretty low...unless you have a number of mods done to it and have a lead foot! I'd say you have some other issues you need to address to get you up into the standard 10-14 MPG range that most of us see.

The closest thing to straight bolt-in I can think of (just speculating wildly here) is the Getrag 5-speed offered in the Dodge trucks when they first started offering the Cummins ('89-'93) before they switched to the NV4500 due to reliability problems with the Getrag. The Getrag, for some reason, was built with the standard Ford transmission bolt pattern so it will bolt up to a Ford bellhousing. But the Getrag input shaft is both larger diameter and longer than the Ford, (like the typical NP-435 4-speed) so you'd need a spacer and an appropriate clutch disc, and it's probably still not worth the hassle due to the fact that the Getrag is a POS, though the likelihood that it would hold up better behind an FE than the Cummins is probably pretty good.

This has come up a number of times already and there have been a number of solutions tossed about, but off the top of my head I don't recall what alternatives were offered. Perhaps some others will chime in here...
Reply With Quote
  #3  
Old 11-29-2010, 03:02 PM
northerndave's Avatar
northerndave northerndave is offline
Elder User
 
Join Date: Dec 2007
Location: Up Nort Minnesota
Posts: 803
northerndave is gaining momentum as a positive member of FTE.
Quote:
Originally Posted by TigerDan View Post
and it's probably still not worth the hassle due to the fact that the Getrag is a POS,...
That cracked me the hell up
Reply With Quote
  #4  
Old 11-29-2010, 04:48 PM
TigerDan's Avatar
TigerDan TigerDan is offline
Super Moderator
 
Join Date: May 2004
Location: The hills of No. Calif.
Posts: 12,163
TigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputation
Glad I could help make your day...
Reply With Quote
  #5  
Old 11-30-2010, 06:37 PM
68Ford4Life's Avatar
68Ford4Life 68Ford4Life is offline
Senior User
Thread Starter
 
Join Date: Nov 2010
Location: North Carolina
Posts: 214
68Ford4Life is starting off with a positive reputation.
Ok, I have been lookin at the T5 transmission by Borg Warner, could that be made to work?
Reply With Quote
  #6  
Old 11-30-2010, 07:08 PM
davethecow davethecow is offline
Elder User
 
Join Date: Jun 2005
Location: fallon nv
Posts: 640
davethecow is gaining momentum as a positive member of FTE.
The clark 5 speed found behind 361 and 391 FT motors in f600 and f700 trucks from the 70's can be made to work.
You will need a custom flywheel. They are a big heavy transmission and the final gear is 1.1 same as the np435. but it has closer gear spacing and a lower 1st. Use with tall gears in the rear and that would work.
Reply With Quote
  #7  
Old 11-30-2010, 07:53 PM
TigerDan's Avatar
TigerDan TigerDan is offline
Super Moderator
 
Join Date: May 2004
Location: The hills of No. Calif.
Posts: 12,163
TigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputation
The T5 has a different bolt pattern than the standard Ford transmission pattern, as well as a longer input shaft so yes, it could be made to work with an adapter/spacer between the bellhousing and transmission.

However, even the World Class T5 would be marginal in its ability to stand up to the torque of even a stock 390. The WC T5 is rated at 300 ft/lbs of torque while a stock 2bbl. 390 puts out around 375, so you can see it's not a good match. The T5 can be upgraded to handle more torque, but it's not cheap. By the time you're done, you might as well have just bought an NV4500 and swapped that in instead.

Check out the Domestic Truck Tranny Guide for tranny identification and ideas of what's available:

Domestic Truck Tranny Guide
Reply With Quote
  #8  
Old 12-01-2010, 05:19 PM
garbz2's Avatar
garbz2 garbz2 is offline
Post Fiend
 
Join Date: Nov 2000
Location: Glendale Arizona
Posts: 6,002
garbz2 has a great reputation on FTE.garbz2 has a great reputation on FTE.garbz2 has a great reputation on FTE.garbz2 has a great reputation on FTE.garbz2 has a great reputation on FTE.garbz2 has a great reputation on FTE.
Speedway motors makes a new steel bellhousing for FE engines to accept a T-10 Four Speed T-45 or Tremec TKO 500 or 600 transmissions.

I believe a TKO 500 will live quite well behind a fe as it is ratted to 500 FT#

They also offer the same type bell for 385 series big blocks.

Garbz
Reply With Quote
  #9  
Old 12-01-2010, 07:58 PM
Victor L's Avatar
Victor L Victor L is offline
Senior User
 
Join Date: Nov 2009
Posts: 301
Victor L is starting off with a positive reputation.
Do you have any idea what gear ratio you have in the rear ?
If they are pretty low, like 4.10 to 1, maybe you might want to consider
highway cruising gears like 3.50 to 1, or possibly 3.00 to 1, and keep the transmission you have. Might be more simple.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
big block 390 68ford390 1967 - 1972 F-100 & Larger F-Series Trucks 9 01-07-2015 09:33 PM
Is there any 4/5spd auto i can bolt up to my 390? Mike68 1967 - 1972 F-100 & Larger F-Series Trucks 14 01-17-2013 02:20 PM
harmonic balancer rockbasher 1973 - 1979 F-100 & Larger F-Series Trucks 2 04-26-2010 02:00 PM
Which tranny for 390? twkisner FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428) 8 09-05-2003 02:47 PM
Tranny swap on 68 F100 gfincher 1967 - 1972 F-100 & Larger F-Series Trucks 3 08-06-2003 07:03 PM


Go Back   Ford Truck Enthusiasts Forums >

Tags
390, 56, 5speed, bolt, f100, fe, ford, make, motor, motors, pickup, speed, trans, transmission, wod

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump


All times are GMT -5. The time now is 08:25 AM.


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.