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#1 |
Registered User
Join Date: Oct 2003
Location: Central Vermont
Posts: 8,538
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2spd Over Drive Install w/Pics
Installed an older style Doug Nash 2spd overdrive transmission in my 72 K20 4x4 in two nights, okay, two long nights. Took two of us about 12hrs total.
Things that had to happen: 1) Had a machine shop make up a stubby slip joint. 6-3/4" open/installed. 2) Had same shop shorten a drive line 29" 3) Earlier in the year when I had new flows put on, I had the guy tip them as much as possible for this application. 4) Scratch build a mount system. 5) Installed a two speed mushroom switch just like the big trucks use for their 2spd axles. I ended up using a grease-able front bushing set I had from ORD for the rubber mounts, worked slick. Just halved the mounts and continued on. Some quick pics... |
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#2 |
Registered User
Join Date: Oct 2003
Location: Central Vermont
Posts: 8,538
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Re: 2spd Over Drive Install w/Pics
Things went along pretty good, it seemed to tuck up nice and alignment was working out.
Hit the bare metal areas with some SEM for protection until I have a chance to get everything finished. Good old rattle can job. Last edited by vtblazer; 11-10-2005 at 01:55 PM. |
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#3 |
Registered User
Join Date: Oct 2003
Location: Central Vermont
Posts: 8,538
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Re: 2spd Over Drive Install w/Pics
More yet...
We made the mounting system so if ever needed, it could be dropped and removed easily. As easily as a tranny can be removed anyway. I kept the original drive line intact and it will be with me on road trips just in case the O/D unit quits working. At least then, I won't be stranded. The good is that it works/shifts and certainly lowers my engine rpm's. The bad is that it needs to come back out...ugh. It's got either a bad bearing, busted gear or something going on. Haven't had a chance to hit the highway yet due to issue's listed above but I'll post up when I do. ![]() I'm pleased with they way you can hardly even notice it, until you really look. Last edited by vtblazer; 11-10-2005 at 02:07 PM. |
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#4 |
I make Models
![]() Join Date: May 2005
Location: Bucks, PA
Posts: 626
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Re: 2spd Over Drive Install w/Pics
Nice job.....have you taken it on its maiden voyage yet with the new over drive??? What will this do for your cruising RPM's and increase in gas mileage??
Disreguard.....didnt see your last post......Nice job though... Last edited by knsmodels; 11-10-2005 at 02:06 PM. |
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#5 |
Registered User
Join Date: Apr 2003
Location: Central PA....In the Berg of Nisbet
Posts: 790
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Re: 2spd Over Drive Install w/Pics
I wish they made a 3 spd version of those old Nash's(Maybe they did but I never seen one).................I know I wish I had one with an underdrive for starting out loads on a grade.
I wanted to stuff a 3 spd Brownie in mine.................I doubt it would have fit so I didn't bother. Anyhow, nice work.
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'72 K-20 EFI'ed 250 Inline/4spd stake body, Farm Truck '71 C-20 Cummins Diesel Powered, In storage thanks to $5.00 diesel! '69 3500 GMC 305V-6/4spd, Still under reconstruction.......... Inlines Rule! 6 soldiers standing is better than 8 laying down!!!!!!!! |
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#6 |
Senior Member
![]() Join Date: Sep 2002
Location: Greenfield Mass.
Posts: 551
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Re: 2spd Over Drive Install w/Pics
Kurt awesome job. It does hurt when you have to take it out again. been there done that. Keep that up and you will have to put a mechanic on retainer as well as your body man. Keep us informed. Your crazy friend Lou. H.
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Certifiably crazy person |
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#7 |
Post Whore
![]() Join Date: Feb 2000
Location: Rose Hill, KS, USA
Posts: 12,684
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Re: 2spd Over Drive Install w/Pics
Looks like you did a great job getting it in there. Sure shortens up that rear shaft!
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1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14 |
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#8 |
Registered User
Join Date: Mar 2005
Location: Just outside Durham, NC
Posts: 894
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Re: 2spd Over Drive Install w/Pics
I was wondering about a brownie setup too....these are the units built by watson/dana/spicer/brown lupe right? (I have been unable to find ANY information on any of these units.....does anyone know anything about them?).
VTblazer, AWESOME job.....I couldn't figure out why the driveshaft was SOO short until I looked at additional pics, I just figured it would bolt to the output side of the transfer case like the gear venders....I like this way better....tucks that drive shaft up there nicely too...what angle did you end up with on the driveshaft when you were done? |
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#9 |
Registered User
Join Date: Feb 2005
Location: Bay Area, California
Posts: 995
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Re: 2spd Over Drive Install w/Pics
Hey, very cool! Keep us updated on how it works!
Is it a manual shift? How did you rig the control?
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1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree |
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#10 | |
Registered User
Join Date: Oct 2003
Location: Central Vermont
Posts: 8,538
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Re: 2spd Over Drive Install w/Pics
Quote:
Matched the 2nd tranny output @ 5 degrees as well. Pulled it out by myself in the driveway in about 15 minutes. |
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#11 | |
Registered User
Join Date: Apr 2003
Location: Central PA....In the Berg of Nisbet
Posts: 790
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Re: 2spd Over Drive Install w/Pics
Quote:
I have seen an over and direct drive box that Dana made.........It goes inbetween the bell housing and transmission on manual trucks and is shifted with another stick in the cab. Looked pretty neat, but I never met anyone that used on in a pickup. I seen one on ebay and I shoulda bought it, but thought it would still be there when I got home, but someone hit the buy it now inbetween when I was at work and home. Works on the same principle as the setup I threw togther here at home with the sag 3 spds.
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'72 K-20 EFI'ed 250 Inline/4spd stake body, Farm Truck '71 C-20 Cummins Diesel Powered, In storage thanks to $5.00 diesel! '69 3500 GMC 305V-6/4spd, Still under reconstruction.......... Inlines Rule! 6 soldiers standing is better than 8 laying down!!!!!!!! |
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#12 |
Registered User
Join Date: Mar 2001
Location: Hernando, MS USA
Posts: 1,152
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Re: 2spd Over Drive Install w/Pics
And to think, I was feelin' so proud of installing my front sway bar. Child's play compared to what you've done.
Great job, and I'm sure you'll get the bugs worked out soon.
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George Morgan Hernando, MS '69 C-10 swb fleetside '72 GMC swb Stepside |
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#13 |
Registered User
Join Date: Jun 2004
Location: Beeville, Texas
Posts: 1,943
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Re: 2spd Over Drive Install w/Pics
Very cool!
![]() There was a 1960's Chevy C50 dumptruck at the junkyard here that had one of those over/underdrive units. The tag said Dana/Spicer on it and it was mated to a SM420 4 speed. It had Under, Neutral, Over, and Direct, I think that's what it looked like on the shift knob. I knew I should have asked how much he wanted for it but the truck got crushed before I even remembered to ask about it. It sucks 'cause that truck just needed some carb and brake work and it could've been a good truck.
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RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck |
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#14 |
72 C30 Trailer Queen
Join Date: Dec 1999
Location: SE MN, USA
Posts: 794
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Re: 2spd Over Drive Install w/Pics
That is some great fabrication work! Thank you for the great pics and do keep this thread updated when you get it back together.
I have the TH400 version of the same DNE2 overdrive that will be going in my 72 C30, so very interested in your results.
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Chris H 72 C30 133" 72 C30 157" flat-dump 69 C10 short fleet 71 ElCamino 2000 K2500 crewcab shortbed (sold, sorry old friend) 2005 GMC 2500HD shortcrew Duramax 2006 K1500 RCSB and a couple other projects/parts |
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#15 |
Registered User
Join Date: Mar 2005
Location: Just outside Durham, NC
Posts: 894
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Re: 2spd Over Drive Install w/Pics
VTblazer, out of curiousity, what was the final cost for the stubby slip joint and having your driveshaft shortened? I have an eaton rearend with 4.56's....and while 4.10's will help, the cost of putting new 4.10's in the front and rear will likely cost as much as getting a setup like this.....just trying to figure out what the total cost of everything but the unit itself will come to....
yes, yes, for those that will chime in with "$1,000 buys a lot of gas"....I have this to say .....it doesn't buy as much as it used to, and at almost 4,000 rpm on the highway.....it won't take long before the replacement of some worn out parts will add up to that same $1,000.... |
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#16 | |
Registered User
Join Date: Oct 2003
Location: Central Vermont
Posts: 8,538
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Re: 2spd Over Drive Install w/Pics
Quote:
![]() My reasoning is not for gas mileage but for parts preservation. I'm not big on my 396 turning 3K (and then some) for hours at a time... ![]() Stubby shaft was quoted @ $200 but turned out to be $300 with the u-joint included. |
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#17 |
Registered User
Join Date: Mar 2005
Location: Just outside Durham, NC
Posts: 894
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Re: 2spd Over Drive Install w/Pics
how about the driveshaft resize?
Did you look into possibly using a stock trans. cross member from a 2wd in place of your setup? (don't have access to as many tools as I would like, and trying to find some steps that save on fabrication). Thanks |
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#18 | |
Registered User
Join Date: Oct 2003
Location: Central Vermont
Posts: 8,538
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Re: 2spd Over Drive Install w/Pics
Quote:
The guy missed the quote of the stubby shaft so bad he cut down the drive line at no charge. Would of been $50 bucks though had he charged for it. To have it balanced was another $60. Didn't look into any other mounting option's. Another x-member might be a good idea/work but you'll still need to fab up a way to attatch it to the over drive itself. Does yours have any mounting points on it? |
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#19 |
72 C30 Trailer Queen
Join Date: Dec 1999
Location: SE MN, USA
Posts: 794
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Re: 2spd Over Drive Install w/Pics
Any progress on this?
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Chris H 72 C30 133" 72 C30 157" flat-dump 69 C10 short fleet 71 ElCamino 2000 K2500 crewcab shortbed (sold, sorry old friend) 2005 GMC 2500HD shortcrew Duramax 2006 K1500 RCSB and a couple other projects/parts |
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#20 |
Registered User
Join Date: Nov 2003
Location: Monroe, La 71202
Posts: 317
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Re: 2spd Over Drive Install w/Pics
how much did it drop your rpm's?
would it fit in a blazer? Last edited by 69k5; 12-05-2005 at 02:12 PM. |
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#21 |
Registered User
Join Date: Oct 2003
Location: Central Vermont
Posts: 8,538
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Update
Okay, here's the good and the bad, yes there's still some bad.
![]() Had to spend an additional $350.00 @ the transmission shop but the guy knew what he was doing and installed a new motor within that price. Turned out that a previous owner installed a 1/4" plate for mounting purposes in between the cases and in doing so, blocked off the oil passage to the front input bearing. ^^NOTE ON THIS^^ neither owners prior to myself had used this unit, therefore they had no way of knowing about these issues. No harm, no fowl. I'll do business/trade with both given the chance. Both board members both contacted me when they read the original thread. Nuff said on that. ![]() So is it perfect? NO. Drive line angles are off. Getting some vibration. The unit will be removed and reinstalled utilizing the new drive line info I've since learned about. Does it work? Have I tried it on the interstate? YES. It works pretty slick, once working correctly it will be a nice mod. @ a 20% overdrive, it lowers my highway rpm's by aprox. 1K - if I can trust the factory tach. I'm in the process of installing a known to be 'accurate' after market tach. I can now keep up with traffic without worrying about trashing my big block. ![]() |
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#22 |
User #12137
![]() Join Date: Apr 2004
Location: kingsport,upper east tenn
Posts: 11,598
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Re: 2spd Over Drive Install w/Pics
are you going to put a skid plate under it ?
looks like a great job ya did there ![]() ![]() |
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#23 | |
Registered User
Join Date: Oct 2003
Location: Central Vermont
Posts: 8,538
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Re: 2spd Over Drive Install w/Pics
Quote:
Most likely though as time and cash allow. |
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