C50 5 speed?
I've recently transformed a 1968 C50 grain truck into a dump truck and plan on driving the behemoth on the highways fairly regularly. It still has all of its original equipment, a 327 with a 4 speed manual and a split rear differential. 58 mph is all she's got. (downhill with a tailwind) Every time I run through the gears I wish there was one more gear to grab. My thoughts are to swap out the 4 speed gearbox with a 5.
Has anyone done this? Am I asking for something I'll regret? Any help or advice appreciated! |
Re: C50 5 speed?
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If I am wrong, hopefully someone will correct me.
I don't think a 5 speed will do you any good for achieving a higher "mph" as the final drive is 1 to 1, just as it is on 4 speeds unless you find something like a Clark V0 overdrive 5 speed - which the final drive is 1 to .8, or another form of overdrive. |
Re: C50 5 speed?
Right, the regular 5-Speed will still be 1 to 1. It will just give you 2 extra gears in-between and most likely a much lower Granny Gear.
Brian, when you say "one more gear to grab" which gear would you be referring to? If you are desiring another last gear, you would need an Overdrive as lexadmn has mentioned. |
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Yes, thanks guys, an overdrive of sorts. I remember I had a 6 speed manual once that had a .67 final ratio, if my memory serves me correct.
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Re: C50 5 speed?
Almost all of the older 5 speeds were 1:1 final. There were a few with OD and if I remember correctly they had weird shift patterns. Some achieved OD by swapping the gears on shaft cluster. So a 1,2,3,4,5 became a 1,2,OD,3,4 3rd was revered to become OD.
The reason I tell you this is the old OD transmissions weren’t very impressive, look for a modern 5 sp out of a more modern med duty truck, or used a nv4500. In a 2wd format they are easy to find, and if you get one from a 3500hd it will have a parking brake on the tail shaft. |
Re: C50 5 speed?
Either that or go with a Brownie with an OD. An Auxiliary Trans that you mount in back of your present trans. You will then have 2 Shifters, but all the gears you will need with OD to boot. Although they are not that easy to find and a little work to install.
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Re: C50 5 speed?
If an aux trans is an option, I use to have a truck with a ranger od unit, advanced adapter makes them. It performed well. It would be alit complicated tho with a ranger and a 2sp rear end. Thief proof
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Re: C50 5 speed?
If an aux trans is an option, I use to have a truck with a ranger od unit, advanced adapter makes them. It performed well. It would be alit complicated tho with a ranger and a 2sp rear end. Thief proof
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Re: C50 5 speed?
read up on the military 2.5ton 5speed . there o.d. on 5th but funky shift pattern . also they basicly bolt up to a gm bell housing that had a 5 speed factory . ( i have a whole extra bell setup from a med duty gas 5 speed )
otherwise browny box / aux box and another lever on the floor to shift . keep in mind the brakes and tires and steering on these old girls was NOT ment for 70+ mph use so watch what mods you do and be prepared for the next round of upgrades . |
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Re: C50 5 speed?
Curious if the NV4500 will bolt right in. If not, what mods would be needed to make a complete swap?
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Re: C50 5 speed?
Here is a good write up on the installation in a 1 ton http://67-72chevytrucks.com/vboard/s...t=nv4500+1+ton
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Re: C50 5 speed?
Is there an option to incorporate a two speed rear into a C30?
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But if you are talking aftermarket, that would be a great idea. An Electric 2-Speed Rear with the high gear being high enough to be like an Overdrive. |
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