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

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  #1  
Old 11-28-2010, 09:32 PM
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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?
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Old 11-29-2010, 01:29 PM
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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...
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Old 11-29-2010, 02:02 PM
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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
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Old 11-29-2010, 03:48 PM
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Glad I could help make your day...
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Old 11-30-2010, 05:37 PM
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Ok, I have been lookin at the T5 transmission by Borg Warner, could that be made to work?
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Old 11-30-2010, 06:08 PM
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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.
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Old 11-30-2010, 06:53 PM
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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
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Old 12-01-2010, 04:19 PM
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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.

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Old 12-01-2010, 06:58 PM
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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.
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Old 12-01-2010, 06:58 PM
 
 
 
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