The Portal Hub: All things Pinzgauer, Haflinger, Volvo 303 and more.

The Portal Hub: All things Pinzgauer, Haflinger, Volvo 303 and more.

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 Overdrive (again) 
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Joined: Wed Apr 14, 2004 9:58 pm
Posts: 1280
Location: Idyllwild, CA
Post Re: Overdrive (again)
Quote:
I can't help but wonder if the Pinzgauer engine would have enough power to drive the vehicle with such a reduction in gearing?

I put the TD overdrive tranny in my 712W (which also has Jim L.'s 2.7l "torquer" conversion). I get exactly 60mph at 3000 rpm in 5th (overdrive) and while that just barely works with the additional power, the Laycock ratio seems slightly better (7% lower ratio) which I would prefer. Plus, with the OD you don't lose the low ratio of first gear (the TD tranny trades first for the overdrive 5th). If proven reliable, I'd say it is definitely a better solution.

Keep me in mind if you decide to put a kit together! Nice work!

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Jim M.
712W and 710M


Mon Apr 06, 2015 5:18 pm
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Joined: Thu Mar 27, 2014 12:18 pm
Posts: 86
Location: Livermore, Ca
Post Re: Overdrive (again)
It has been working flawlessly. Still, when I hit that red button and the truck calms down and almost shoots forward while entering the freeway, I have to grin. I guess it hits the right torque band when the RPMs drop back down, because I swear it feels like a turbo boost.


Mon Apr 06, 2015 5:45 pm
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Joined: Sun Sep 25, 2011 11:19 am
Posts: 431
Location: Woodside, CA
Post Re: Overdrive (again)
This sure is nice. A way better solution than a TD tranie.

The key here is your pick of the shaft with constant velocity joints.
Would be near impossible to eliminate vibration with u-joints.
Impressive bit of engineering.

Hmmm, now you got me thinking about my TD tranie.


Wed Apr 08, 2015 3:58 pm
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Joined: Sun Sep 25, 2011 11:19 am
Posts: 431
Location: Woodside, CA
Post Re: Overdrive (again)
Good technical write up on the care and feeding of the J Type OD unit.

http://buckeyetriumphs.org/technical/jod/JOD1/JOD1.htm

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Puller: 710K 2.7L EFI
Follower: Sankey MK 3, 3/4 Tonne
Driver: Ron // KO0Q


Fri Apr 10, 2015 9:43 am
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Joined: Tue Feb 14, 2017 10:43 pm
Posts: 1
Post Re: Overdrive (again)
Bump!

So, how is it working after a few years? I suspect very well as there are hot rods with this overdrive unit and turbo volvos that have a lot more power and torque.

I'm curious about a couple things, had you considered a P type, which is supposed to be a later, slightly more robust version, and has anyone else yet copied your daring exploit?

Keep up the good work!


Sun Mar 19, 2017 2:56 pm
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