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12-18-2018, 06:51 PM | #1 |
Registered User
Join Date: May 2015
Location: Central Massachusetts
Posts: 496
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Has anyone added an OD aux trans to their truck?
Was thinking of doing this in my '77 K25 so I'd have a "highway gear", or at least drop my RPM from 2800 to around 2000 at 65mph. It would have to go behind the t-case and could only be used in 2WD, which isn't a problem for me. Preferably a 2-speed box, direct and OD. Would rather not go with the Gear Vendors overdrive unit since I don't have an extra 3-4 grand to play with.
Anybody successfully done this with pictures? Or, any recommendations on a truck salvage yard/company that may have used auxiliary transmissions? Any direction/thoughts are appreciated. |
12-19-2018, 12:40 AM | #2 |
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Join Date: Dec 2014
Location: Northern California
Posts: 422
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Re: Has anyone added an OD aux trans to their truck?
I have done it, and frankly, I’m probably taking it out. I have the venerable Spicer 5831b backed with 4.56 gears. It is a neat little novelty, but that’s about the extent of it. I don’t use my truck enough to justify it on the freeway, and it’s loud in overdrive. On top of it, I’m not sure how much parasitic loss I have from running an auxiliary, but my mileage isn’t really any better.
Now, I WILL say that I just converted back to rear drum brakes from disc, and in doing so, discovered one of my rear calipers was dragging to the point I had to pry it off. That said, I’m guessing my mileage might increase, but I’m still probably going to get rid of the Spicer and change gears to 3.73’s. Oh and I got mine for a deal, but by the time I chased down a shifter, put in new seals and bearings (still leaks quite a bit), and chased down the driveline parts and parking brake set up (rear discs, so I didn’t have one with them), and the time, I was into it close to $1000 or so. |
12-19-2018, 09:13 AM | #3 | |
Registered User
Join Date: May 2015
Location: Central Massachusetts
Posts: 496
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Re: Has anyone added an OD aux trans to their truck?
Quote:
So by the time I'm done installing it, I could have spent that money on gas really, pretty much cancels out unless I was driving it a ton. I bought my 5531 for $500 I think? And had it shipped in from SD... I doubt I'll find a deal like that again. Well, I suppose I'll just drive it (every once and a while I get a hair-brained idea!) This truck used to go back and forth between CO and NH up 'till 3-4yrs ago. I'm sure a trip to PA next spring will be no issue. It's done plenty of 100mi/+ trips around NE this year. |
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12-19-2018, 09:28 AM | #4 |
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Join Date: Dec 2011
Location: Yuma Arizona
Posts: 1,525
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Re: Has anyone added an OD aux trans to their truck?
I contemplate it from time to time. Then I come to my senses and remind myself that I can get a good used LS/4l80 setup for less money. And that's the end of that.
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12-19-2018, 09:32 AM | #5 |
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Join Date: Sep 2009
Location: Weare,NH
Posts: 1,592
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Re: Has anyone added an OD aux trans to their truck?
What transmission do you have?
This is a thing for Sm465/Sm420 trucks. https://www.advanceadapters.com/prod...etainer-index/ |
12-19-2018, 10:47 AM | #6 | |
Registered User
Join Date: May 2015
Location: Central Massachusetts
Posts: 496
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Re: Has anyone added an OD aux trans to their truck?
Quote:
Oooh, I like that! Saw one similar searching the web last night. Someone installed one in a 60's or 70's truck resto they were doing. Still out of my budget though... |
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12-19-2018, 12:08 PM | #7 |
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Join Date: May 2012
Location: horseheads,ny rust belt
Posts: 2,794
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Re: Has anyone added an OD aux trans to their truck?
nv4500 for the stupid simple win .
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77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great. |
12-19-2018, 12:14 PM | #8 |
Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,630
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Re: Has anyone added an OD aux trans to their truck?
I put an Advance Adapters Ranger OD in my 68. Bolts in front of the 465
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12-19-2018, 01:28 PM | #9 |
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Join Date: Sep 2002
Location: Liberty, Mississippi
Posts: 672
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Re: Has anyone added an OD aux trans to their truck?
Dad put a little 3 speed Spice (may have been an older Brown-Lipe) in a 64 Chevy 3/4t behind a 6.2 diesel and a 465 trans.
It's tucked in the back of my barn since he passed, but will try to remember and get a few pictures Friday or Saturday when I'm off work |
12-19-2018, 02:00 PM | #10 |
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Join Date: Jun 2016
Location: Phoenix, AZ
Posts: 574
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Re: Has anyone added an OD aux trans to their truck?
/Thread
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87 R30 CC Dually, TBI 454, NV4500, zero rust barn find 87 Jeep Grand Wagoneer, 6.5 turbodiesel, 700R4 |
12-19-2018, 02:42 PM | #11 |
Senior Member
Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,883
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Re: Has anyone added an OD aux trans to their truck?
Did you get better MPG after this?
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. |
12-19-2018, 04:27 PM | #12 | |
Registered User
Join Date: May 2015
Location: Central Massachusetts
Posts: 496
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Re: Has anyone added an OD aux trans to their truck?
Been there, thought about that...
Quote:
I too am curious... |
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