99 f450 6spd conversion - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 06-12-2013, 10:33 AM Thread Starter
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99 f450 6spd conversion

I have a 99 f450 aluminum body dump truck with 135000 miles on it. Has big rearend gear. Had the automatic rebuuilt about year and a half ago. hardened input shaft,billet torque convertor,hd clutches. This thing does 80 at redline. I want to convert it to a six speed. So where do I start? I need pedal assembly,trans,etc. anyone able to break this down and maybe know where to locate some of the parts? any help would be great. thanks
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post #2 of 7 Old 06-12-2013, 11:12 AM
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Your gonna want a parts truck for sure otherwise your gonna be nickel and dimeing your wallet left and right

Heres a sticky
Auto to Manual Converstion

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post #3 of 7 Old 06-12-2013, 01:58 PM
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Just curious, what does the "redlines at 80" have to do with a tranny swap?
Is 80mph not fast enough for a dump truck?
The overdrive gear ratio is very similar if not the same on the two trannys so top speed will not be affected.
But if you want to have a 6speed for other reasons, go for it
Good luck with the swap

PIS 175/80's, Van Turbo with EBPV, BD Billet Wheel
Lots of money spent at RiffRaff
Holley fuel pump, in tank mods, crappy riding leveling kit, DP-F6, 5 Gauges+Edge CS in dash, CB radio in Dash, over 100 goofy little mods
Still pretty slow, just less slow now.
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I love finally having my truck back... that 7.3 dog that I was driving was just not cutting it.
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post #4 of 7 Old 06-12-2013, 02:05 PM Thread Starter
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Quote:
Originally Posted by Joel View Post
Just curious, what does the "redlines at 80" have to do with a tranny swap?
Is 80mph not fast enough for a dump truck?
The overdrive gear ratio is very similar if not the same on the two trannys so top speed will not be affected.
But if you want to have a 6speed for other reasons, go for it
Good luck with the swap
let me clarify this, I'm on the highway a lot, from 68-80 i'm pushing redline. now i've been in some 450's with the same rear gear and they are not revving that high all the time. even 50-60 is high rev. not only that, but I pull a cat 289c with a mulcher on a heavy trailer, would like the option of up and down shifting
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post #5 of 7 Old 06-12-2013, 02:13 PM
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I totally agree that the 6 speed is a better fit for an F-450, especially one hauling weight.
But the final drive ratio of the two transmissions in question is the same. If you want to change that you will to change ring and pinion in the diff as well.

PIS 175/80's, Van Turbo with EBPV, BD Billet Wheel
Lots of money spent at RiffRaff
Holley fuel pump, in tank mods, crappy riding leveling kit, DP-F6, 5 Gauges+Edge CS in dash, CB radio in Dash, over 100 goofy little mods
Still pretty slow, just less slow now.
Quote:
Originally Posted by peixinho View Post
I love finally having my truck back... that 7.3 dog that I was driving was just not cutting it.
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post #6 of 7 Old 06-12-2013, 03:04 PM Thread Starter
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anyone know where to view the specs between the 2 transmissions?
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post #7 of 7 Old 06-12-2013, 04:23 PM
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6 speed is slower I'll top out at about 78 lol od on the six is .73 on the 4r100 it's .71 I believe


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99 ford f-250 crew cab powerstroke
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