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 Post subject: D150 re-gear
PostPosted: Thu Dec 23, 2021 5:46 pm 
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1 BBL (New)

Joined: Sat Dec 05, 2020 6:54 pm
Posts: 9
Location: JesMat5243
Car Model: 1987 D150
82 D150 shortbed. 225 slant with A833 OD. 8.25 rear end currently with 3.23. Looking to get more pick up off the line without sacrificing too much highway manners. I know you can’t have both but this numerically low gear is a dog.


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 Post subject: Re: D150 re-gear
PostPosted: Thu Dec 23, 2021 7:19 pm 
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Turbo EFI
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Joined: Wed Oct 12, 2005 9:00 pm
Posts: 2366
Location: kankakee IL
Car Model: 80 volare, 78 fury 2 dr, 85 D150
all stock? Still lean burn controlled? any mods? What size tires?


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 Post subject: Re: D150 re-gear
PostPosted: Fri Dec 24, 2021 7:45 am 
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1 BBL (New)

Joined: Sat Dec 05, 2020 6:54 pm
Posts: 9
Location: JesMat5243
Car Model: 1987 D150
Holley 2 barrel 350 cfm, Aussie speed headers, hei upgrade, 235/70r15 all the way around.


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 Post subject: Re: D150 re-gear
PostPosted: Fri Dec 24, 2021 9:08 am 
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Supercharged
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Joined: Thu Jan 27, 2005 8:32 pm
Posts: 7834
Location: SW Washington
Car Model: Fiat 500e
I would go straight to 3.90 or 4.10. The overdrive in the trucks is .71:1 The formula is axle ratio x high gear ratio = overall high gear ratio. 4.1 x 0.71 = 2.911 Plenty of these trucks came with 3.55s without OD so you'll be turning 18% less RPM than those.

I drove my '66 Dart for years with 4.10s, 26" tall tires and the car A883OD's top gear of .73:1 It's perfectly fine.

_________________
Joshua


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 Post subject: Re: D150 re-gear
PostPosted: Fri Dec 24, 2021 9:39 am 
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1 BBL (New)

Joined: Sat Dec 05, 2020 6:54 pm
Posts: 9
Location: JesMat5243
Car Model: 1987 D150
Great info! Thank you for the help.


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 Post subject: Re: D150 re-gear
PostPosted: Fri Dec 24, 2021 12:33 pm 
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Turbo EFI
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Joined: Wed Oct 12, 2005 9:00 pm
Posts: 2366
Location: kankakee IL
Car Model: 80 volare, 78 fury 2 dr, 85 D150
I have an 85 D150 longbed/ that once I get my new engine installed, I'm hoping to be able to retain my 3.21 gears. Difference between yours and mine is that mine has a 727 automatic rather than a stick trans. I wish mine had a stick, if I can eventually drum up the parts I may convert it to a stick, possibly even a 5 speed (lots of talk about T5 conversions here) I have heard of people also using (ugh) a Toyota W58 trans instead of a T5. My new engine, as is the existing engine, are both /6... difference being the work and mods I have put into the "new" engine, vs bone stock/ will hopefully help my get up and go factor while retaining the /6. .


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 Post subject: Re: D150 re-gear
PostPosted: Thu Dec 30, 2021 10:08 am 
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TBI Slant 6
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Joined: Sun Aug 14, 2016 5:52 pm
Posts: 160
Location: SW Washington
Car Model: 66 Valiant, 82 D150, 94 Ram 2500 TCD, 69 Dart
I have an 82 D150 long bed, slant and 833OD with 3.55 gears. It does OK just to drive for transportation, but when I put a load in it or pull my flatbed trailer I have to slip the clutch to get it going. 3.91 gears would be better.


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 Post subject: Re: D150 re-gear
PostPosted: Fri Dec 31, 2021 11:53 pm 
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TBI Slant 6
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Joined: Wed Aug 16, 2017 10:44 pm
Posts: 108
Location: Reading, Pa.
Car Model: 1982 D150 225, 2bbl., 833 OD
I also have an '82 slant shortbed, stock, '78 BBD, HEI with 833OD, 3.21 FD. I currently run 225/70/15 rear tires and have run 215/75/15 (27.7 in. dia.) In the past I often wished for a 3.55 or ideally, a 3.73 aftermarket rear. That thinking was mostly based on making the .71 4th gear a more useable commodity. As it is now, I rarely try to use top gear under 55 and that is on a nearly flat road. On rare expressway driving that OD is nice for flatter terrain and 70 mph. The thing is, I like the flexibility of third gear very much now. Depending on terrain, it will handle 35 to 70. It will also climb semiserious grades in third at ~40-45., near the torque peak around 1800.

The first gear on the slant 833OD is something like 3.09. I've found that steep gearing nice on the very occasional times I haul about 1000 lbs. I can't imagine living with it with anything shorter than a 3.55. If I had an auto and it's 1:1 third gear it would very close to what I'm driving now without 4th. I guess the super wide gear spacing on the 833OD make anything a compromise. If I was running taller tires with a slant truck, like 235/75/15 or bigger, than a 3:55 or shorter would almost be required.

I suppose that if you had a non-OD 833 with a 1:1 fourth and taller first then a 3:55 would be a good compromise between good acceleration and not crazy engine speed at 65-70. All depending on tire size a good bit.

_________________
1982 Dodge D150 ( Ram)
225 with A833OD. 2bbl. Non power brakes


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