superj

i have been looking into gears because i am going to regear to 4.10s. i noticed some people say the difference between high and low pinion is the high pinion are reverse cut versus the low being normal cut? i know what reverse cut and normal cut means so i don't need this explained.

my question, is are our different pinion set ups actually reverse cut?

tannerp89

haha im regearing to 4.56's and have the HP d30 and its standard cut. youll need a new carrier though i believe, what size tires are you running?

4.3L XJ

Standard cut means the pinion is designed to rotate clockwise as you face it, same as the engine. For first 70 years of 4X4 history, these same differentials were used in front ends. In the 80s, the high pinion differential was designed and used in vehicles like the XJ. These were designed to be turned around and used in the front in which the drive shaft rotates counterclockwise as you face the pinion. Either can be used. There is a rumor that the reverse cut is stronger in the front than the standard cut. But recent testing has proven that there really is little if any difference in strength. The only real advantage to the high pinion differential is driveline angle when lifting.

fantic238

Yes the dana 30 high pinion is a reverse cut.

tannerp89

is it really? huh my guy at high mountain didnt mention that, good thing im still shopping for my 4.56's...i better call him. who would you suggest for a good ring/pinion?

fantic238

That is impossible.

tannerp89

ok i stand corrected, already said that. so its reverse cut, got it. i still need a new carrier and still need to buy my 4.56 gear sets, who would you suggest i get? im not going cheap on this by any means....

superj

ok, so my 87 is normal cut so when i get the 4.10 i will just get standard cut gears then and they will work in my carrier i have now?

i am running 31s and am going to stay with these or maybe 32s but not go upto 33s. i currently have 3.55 gears and my jeep is a dog and gets terrible gas mileage now. its slow to start and feels like its not in the powerband now so i figured 4.10s would be better then 3.73 or 4.56.

tannerp89

if your gonna bump to 32's id go with 4.56's, with 32's and the 4.56's it puts you almost back to stock on the power band.
look at this thread i started...couldnt decide between 4.11's and 4.56's....gives good reasons why i chose the 4.56's....
https://www.cherokeeforum.com/f2/reg...s-4-56s-49160/

superj

well, i will stay down to 31s then. i'll check your thread too though but i don't want ot go with huge tires again as i have in the past. unless they are those thinner ones

superj

we need one of those charts for the 4.10

tannerp89

i wont go bigger than 33's cause i dont want to lose flex and dont wanna lift higher, and only time id run anything bigger is if i was muddin or something.
i just think if your gonna drop the bank to gear plan ahead, sure right now i dont think ill go bigger than 33's, but i said that about 31's too so....

tannerp89

lol i asked....

fantic238

That is true. A standard cut gear, when used in the front, must push on the weaker side of the gear to move the vehicle in a forward direction. Pinion must work on the concave surface of the tooth and ring must work on the convex surface.

fantic238

I have no idea i don't live in the states. I buy my stuff on the internet. PM vendor endlessMtnFab and tell him i send you.