oregon96psd
Full Access Member
What three speed has an overdrive?
Zf5 cross reference between IDI and psd.
- Thread starter Duke57
- Start date
What three speed has an overdrive?
The A833 used in mopars and some 80's chevy trucks? Ford may have had a 3+OD trans too. Not sure I'd subject one to IDI torque multiplied by the first transmission....
nelstomlinson
Full Access Member
Sorry, I completely misspoke. What I was trying to get across is that even with straight through gearing on both transmissions, a sufficiently shallow ratio on the rear end would make it like OD, and let you keep your RPMs down at high speeds. We could maybe use a 2.5:1 or so instead of a 4.10:1.
That's the question, I suppose. Is there an old pickup truck transmission that could handle the torque?
You can't tie two regular transmissions together like that. The second regular transmission is not designed to handle the input torque that would be generated by the first transmission in it's lower gears.
That is why the input shaft is so much smaller than the output shafts on transmissions. When you put a transmission in 1st gear, you are taking the speed of the engine away and converting it to torque, and it can twist the small input of another transmission right off.
That is why the input shaft is so much smaller than the output shafts on transmissions. When you put a transmission in 1st gear, you are taking the speed of the engine away and converting it to torque, and it can twist the small input of another transmission right off.
nelstomlinson
Full Access Member
That should have been obvious to me, I suppose.
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