Is your father's truck not stock like yours? You can't and you shouldn't compare the two. There different.

Put it in third and go 65. I bet it will do it...

 

I have consistently run mine at 3200 for a hill climb because that's what the traffic dictated at the speed. So if you throw it in third and run it at 3200 ish for you hill climb your not going to hurt anything. These motors are very tough. Listen to your gut if you want to regear your truck then that is probably the best move for you. If you don't want to then try the higher rpm's. if you don't like either look at building the motor or a motor swap. Not trying to pick a fight here. It's just when you realize they we are trying to just give you good advice. Some times it could be necessary to reask the question in the same thread. Just trying to help.

 

I understand they are different. I dont understand what your trying to suggest though? Sure it will go 65 in third. What it doesnt do is leisurely pull a small trailer up grade at 45 similar to my fathers factory truck. It was my understanding that reducing the gear ratio would put our trucks back to equal performance. Equal being... I should have the same rear wheel power as the truck I started with before my alterations. If I put my 4.10's back on my truck with my 29" yokahama's I could certainly take the hill leisurely in forth just like my father.
Your suggesting that I need to rap it out to do the same with the larger tires, whats the purpose of reducing the drive ratio then? If I would have kept the 4.10 ratio I could have possibly gone up the hill pulling a trailer in second gear while running my 33's and rapped out?
I dont understand what your trying to suggest? Why not compare them? When I reduced my gears
, I reduced them so I could get back the power I lost by going to the larger tires. I didnt put a blower on my motor trying to get the lost power back.
If Im on grade in 4th gear and 2200rpm and the motor cant pull any harder isnt it logical to reduce the gear ratio and run it at 2600rpm and have more power?
Im not saying I cant go faster with manipulation. What Im saying is that the truck I started with (almost the same as my fathers truck which Im using as a comparison) had more power to the pavement (which was supposed to be alleviated with the gear swap).

 

Are you factoring in the extra rotating mass. ie. the weight of the larger tires. There can be a big difference between 31's alone. I have 31:10.5:15's on my stock 93 22re 4x4 xtrcab w/4:10 gears. My Toyo open country MT's are dry heavy. I put my buddies cooper discovers on the are 31:10.5:15's and it was like a whole different truck. His tires are a lot lighter than mine and it felt like I had more power. There are many different factors to consider besides gearing and factory ratio to make stock again. That essentially mean that your speedometer will be accurate based on your tire size. Once you modify a truck you should not expect stock performance again. You can try and make it close to stock but a modified truck is a modified truck. And will not be stock with out actually making it stock again. Likewise a stock truck will not be up to a modified truck off road. Just figure out what you want it to do best and then purpose it for that. You can try and fill in the gaps for the other items it might struggle with and in many areas you will succeed but in some it will be all you can do to get it closer.

 

If you would have reduced your gear ratio to 4.56, wouldnt you have realized a difference in your power with the heavier tire?
Im thinking Im trying to say the same thing here. Reducing my ratio to factory (spedo) ratio doesnt account for the weight of the heavier tires. I should have gone lower to gain the extra power needed for the extra rolling resistance and weight (not to mention the extra wind resistance).
Yes, 4.88's put my spedo back to correct (within 2 miles per hour at 30) but they did not give me anything extra to turn the extra weight.

 

Just gonna throw this out there to support snobdds idea of the thin air being the problem.


I run 31/10.50s and my buddy is running 33/12.50s on stock 22re's with stock gearing of 4.10 (both in 1985 pickups). We are at near about sea level being in Florida, I have no issues pulling hills (including a pretty steep hill near my house) and When my buddies truck is running right, his will pull them with just slightly more effort than mine.


In fact, when I made the swap from stock to 31's I didn't really notice to much power loss. When I drive his truck, I do notice that I have to rev the gears out a little further, but not bad.

 

Lol
Ok, im wrong, my trucks back to factory power ratio with these gears. Im completely mistaken all along. My built motor is just suffering from altitude sickness and my fathers truck isn't. Im sorry I wont mention it again.

Semper-fi

 

Thanks.