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Author Topic: pinto v6 8" automatic rear end ratio  (Read 246 times)

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Offline LongTimeFordMan

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pinto v6 8" automatic rear end ratio
« on: June 01, 2021, 11:37:37 PM »
does anyone know what rear end ratios were used  in v6 pintos with auto.trans.and 8" rear end?
Red 1973 pinto wagon DD, SoCal desert car, Factory 4 speed, 3.40 gears, Stock engine, 14" rims and tires, 60 K original miles

Offline Wittsend

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Re: pinto v6 8" automatic rear end ratio
« Reply #1 on: June 02, 2021, 11:28:06 AM »
The ratio specific to the V-6 Pinto, no, I don't know. But as mentioned in the other post the Ford 8" as it came in the Pinto or Mustang II only had 3:00, 3:40 and 3:55 ratios. The rear tag on the axle housing bolt should state the ratio. My assumption is that the any of those ratios might have been used.

Offline lugnut

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Re: pinto v6 8" automatic rear end ratio
« Reply #2 on: July 09, 2021, 08:49:33 PM »
The one I have that I plan to put in my 74 wagon says 2.46 on the tag. It came from a 78 V-6 wagon. Gees, I hope thats not too high- I plan to put in a T-5 trans!
mike

Offline lugnut

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Re: pinto v6 8" automatic rear end ratio
« Reply #3 on: July 10, 2021, 12:12:15 PM »
I may have made a mistake above- the tag also has 3 0 0 on it, so maybe 3.0?

Offline Wittsend

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Re: pinto v6 8" automatic rear end ratio
« Reply #4 on: July 10, 2021, 05:26:39 PM »
Well, better than being 2.46. I had 3.00 gears in my Pinto with a T-5 (and Turbo engine). The 3.97 1st gear will get the car rolling Ok. When not on boost the 2.3T engine is like a N/A engine. So with that in mind here is my experience with a 3.00 rear and a T-5.

As mentioned the low first gear is Ok (didn't say great) at getting the car rolling. The big issue I had was that for posted speed limits (25, 30, 35, 40, 45 MPH etc.) it just seemed like there was never a "right gear" for those speeds. If the motor seemed wound out an upshift caused it to bog. If it seemed bogged a down shift seems to make the engine seem wound out. Even on the freeway at 65 MPH in 5th gear any inclination was noticeable. Initially I has 215-60-14 tires but went to 175-70-13 tires when I got a set of Rallye wheels.

I went to a 3.40 rear and for everyday driving the ratio is SO MUCH better. Specific gears are just right for normal posted speed limits. There is no more of the 'stuck between two gears' as far as the torque curve of the motor. What I did lose was the longer pull between shifts (like getting on the freeway). Where the turbo was spooled up and one could decidedly feel (and enjoy) the ever rapidly increasing power. Now with the 3.40 rear it seems like I have to shift way too soon and pretty much 'blip' in and out of boost. As nice as the long pull with 3.00 was..., 98% of the time the car isn't driven that way and I have accepted the trade-off.

Offline flash041

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Re: pinto v6 8" automatic rear end ratio
« Reply #5 on: July 11, 2021, 04:59:09 PM »
My 78 V6 C4 automatic Cruising Wagon came with a 3.40 8 inch rear end ratio. About 5 years ago I switched to a 3.00 to lower the rpm on the highway. It dropped my rpm by about 400. With the 3.4 at 65 the engine was at about 3500 rpm , with the 3.00 70 was about 3500 rpm. However, this spring I switched back to my 3.40 ratio. The reason is a now have a camper that I tow. I usually tow between 55 and 60 and would have to downshift to 2nd on hills more often that I liked. The lower ratio keeps the rpm's up. During my trip to Carlisle, it seem to work better.     
1978 Pinto Cruising wagon (I am the original owner ! ) Built Aug 15th 1977 in NJ
1993 Mustang LX 2.3 convertible

Offline Wittsend

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Re: pinto v6 8" automatic rear end ratio
« Reply #6 on: July 12, 2021, 06:59:56 PM »
The 2.3, T-5 has a .79 overdrive. So that effectively drops RPM 20%. Most people forget but tire size is a factor too. Here are some results with a 3.40 rear and the T-5 .79 overdrive at 65 MPH:

22" tire = 2,667 RPM,  23' tire = 2,551 RPM, 24" tire = 2,444, 25" tire = 2,347 RPM, 26" tire = 2,256 RPM

With 3.00 rear and the T-5 .79 overdrive at 65MPH:

22" tire = 2,353 RPM,  23' tire = 2,251 RPM, 24" tire = 2,157, 25" tire = 2,070 RPM, 26" tire = 1,991 RPM

The 3.40 rear ratio and 26" tire is about on par with the a 3.00 rear ratio and a 23" tire. Also keep in mind lowering RPM sounds good but if you don't have the torque in the motor you are in for a long, slow rate of getting up to speed. As an alternative to the T-5 I'm of the mind set that if you are going for a long drive have a cheap set of steel wheels and very tall tires for getting there. Then swap to your nice matching set once you arrive. You might find a set cheap at a wrecking yard with decent tires for $50-$100.  BTW, this is for "lugnut." I realize "flash041" does extensive travel and toting a spare set of wheels is impractical.

This is the link to the calculator I used: https://purperformance.com/p-29669-rpm-calculator.html