D100 + 440 + 727 + 3.91 = tire spinning. Oops!

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my5thmopar

Life Long MOPAR Owner
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I've been testing the D100 project this week. Getting some bugs worked out. Take off slow and it is way too easy to spin tires. Hitting 2nd under light throttle barking tires. 3rd will hit hard and break loose with 1/2-3/4 throttle. Zero traction with this truck. I'm hoping the 3.23 w/sure-grip and new tires will help. But, hey it's fun and I'm not complaining. I took the wife for a ride last night and oops...sorry honey I didn't mean to bark the tires. She did grab the door when I stepped on it getting a smidgeon sideways going into 2nd. Of course I also got the... you're too old for that look. We know most of us don't outgrow that part of the kid in us. No more rides for her!
 
440's are torque monsters. Post some pictures...… and more details about the build
 
I've been testing the D100 project this week. Getting some bugs worked out. Take off slow and it is way too easy to spin tires. Hitting 2nd under light throttle barking tires. 3rd will hit hard and break loose with 1/2-3/4 throttle. Zero traction with this truck. I'm hoping the 3.23 w/sure-grip and new tires will help. But, hey it's fun and I'm not complaining. I took the wife for a ride last night and oops...sorry honey I didn't mean to bark the tires. She did grab the door when I stepped on it getting a smidgeon sideways going into 2nd. Of course I also got the... you're too old for that look. We know most of us don't outgrow that part of the kid in us. No more rides for her!
Yep, you'll have that. I bet you could put a 2.78 in there and still break the tires loose at will.
 
Hell, sounds like fun to me! BTW, you're never to old to have that kind of fun! 65'
 
PICK UPS HA
I've been testing the D100 project this week. Getting some bugs worked out. Take off slow and it is way too easy to spin tires. Hitting 2nd under light throttle barking tires. 3rd will hit hard and break loose with 1/2-3/4 throttle. Zero traction with this truck. I'm hoping the 3.23 w/sure-grip and new tires will help. But, hey it's fun and I'm not complaining. I took the wife for a ride last night and oops...sorry honey I didn't mean to bark the tires. She did grab the door when I stepped on it getting a smidgeon sideways going into 2nd. Of course I also got the... you're too old for that look. We know most of us don't outgrow that part of the kid in us. No more rides for her!
Pick ups have very little weight on the rear wheels ,long beds are worse than short beds ,as far as front to rear weight ratio. Add a little power and all of them will do that .
 
My w150 318 does that also just stock but no weight on the rear. Works well when I have f gas cans full in it though!:lol:
 
My w150 struggles to break em loose. Mind you,2.73 and 35” tires is a poor combination.
 
Had the same problem with a 383 pickup. I put a large plate on bottom side of frame rails above the pinion. Then came off the snubber with 2 square tubing and put it tight on that plate. Helped a bunch...
 
Pics.jpg


:D
 
Reading this post brought back good memories of my 77 long bed. Plain white with chrome wagon wheels. What a fun truck that was with a 67 440, cam, headers, intake and an 850 Holley. 4:10 gear. Man I surprised quite a few Mustangs and tuners from stoplight to stoplight. It was a blast to cruise on Saturday nights just to see who we could mess with. Finally sold it cause it was killing me in gas as a daily and I wanted A/C. I saw it around for a while then it disappeared. Enjoy your truck!
 
Reminds me of my 78 Powerwagon that I had in college. Shortbox regular cab originally a 400 BB but it had a 1970 383 in it with a holley pro-jection fuel injection kit and a built 727. Even with 35 inch tires that thing screamed. Used to consistently beat a buddy with an SRT-4 neon which pissed him off to no end lol.
 
The 3.23s are gonna make it spin worse.
 
Not sure how you’re figuring that 3.23 vs the 3.91 in there now. Want to explain your theory?


It's not theory. It's fact. 3.23 will spin the tires much faster and harder than 3.91.
 
It's not theory. It's fact. 3.23 will spin the tires much faster and harder than 3.91.

I agree faster but, the 3.23 will require more torque and throttle to do so. I’m suggesting that the 3.23 won’t be as easy to get it spinning. I went from 3.55 to 4.56 in my other truck and slightest throttle would make 4.56 spin. With the 3.55 I really had to get into it to spin tires. If what you’re thinking with the 440 it may not matter.....it’s going to spin, you’re correct.
 
I agree faster but, the 3.23 will require more torque and throttle to do so. I’m suggesting that the 3.23 won’t be as easy to get it spinning. I went from 3.55 to 4.56 in my other truck and slightest throttle would make 4.56 spin. With the 3.55 I really had to get into it to spin tires. If what you’re thinking with the 440 it may not matter.....it’s going to spin, you’re correct.

Yes. If it breaks loose now, the 3.23 will make no difference there. The 3.23 is only going to make the problem worse. With the the 3.91 the tires will stop spinning much sooner. WIth the 3.23 they'll spin forever. lol
 
With higher (numerical) gears like 4.10 etc you are multiplying the available torque that goes to the pavement more so how is it that a lower (numerical) gear would be easier to spin when you'd have less available torque to spin said tires given the torque multiplication would be less with lower (numerical) gearing?

Would they spin at a faster speed at any given engine rpm vs a higher (numerical) gear at the same rpm? Yes of course they would. I just don't see how having less available torque being applied from the rear wheels to the ground is somehow supposed to make it easier to spin the tires? If that was the case why are 2.76 highway gears not just roasting the tires at every stop light but cars with 4.10's can easily spin the tires?
 
With higher (numerical) gears like 4.10 etc you are multiplying the available torque that goes to the pavement more so how is it that a lower (numerical) gear would be easier to spin (I didn't say that) when you'd have less available torque to spin said tires given the torque multiplication would be less with lower (numerical) gearing?

Would they spin at a faster speed at any given engine rpm vs a higher (numerical) gear at the same rpm? Yes of course they would. I just don't see how having less available torque being applied from the rear wheels to the ground is somehow supposed to make it easier to spin the tires?(Again, Ididn't say that) If that was the case why are 2.76 highway gears not just roasting the tires at every stop light but cars with 4.10's can easily spin the tires?

Never said anything about the tires will be easier to spin. I said they will spin faster and harder both of which are true.
 
We're all missing the best solution here. Mini tub it

That and bigger and stickier tires are the answers. And numerically higher gears so it hooks up quicker.
 
The only thing that helped my 65 D100 440 powered was 14x32 slicks.
You might try the tallest soft compound street tire you can get under it and a taller gear.
good luck, my truck would roast street tires until I let off or the tire popped. lol
 
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