richmond gear how to tell ratio

[coreys87]

ok guys. i have the covers off my axles and they have richmond gears in them. how can i tell what the ratios on them are?

 

[sean1960]

Divide the teeth on the ring gear by the number of the teeth on the pinion gear.

 

[HotRodPC]

If you have the covers off, you can count the teeth, or you can look for markings of the teeth on the ring gear. Like a 41-10, would mean 41 teeth on the ring, and 10 on the pinion. Divide the # of ring teeth by the pinion teeth, so 41 divided by 10 = 4.1 which is 4.10 gears. Most gears are marked xx-x (if the pinion is a single digit) or xx-xx (if pinion is 2 digits, 10 or 11 etc) Fairly simple really once the covers are off.

 

[coreys87]

thanks guys. i just couldnt remember which you divided which by. lol thanks

 

[coreys87]

ive been beating my brains out. the numbers arnt like you said, its like 5 numbers than a set of 4 numbers but they dont divide right.

 

[crazy4offroad]

ive been beating my brains out. the numbers arnt like you said, its like 5 numbers than a set of 4 numbers but they dont divide right.

Just count the teeth of the ring gear and pinion and post them here, one of us can work a calculator for you.. j/k but seriously just count em and post em here.

 

[coreys87]

counted em up. 3:73s and 3:08s. the only catch is my truck has 308 in the front already because the previous owner only switched the rear axle to 456 for pulling. should i just put the 12bolt 308 in? or switch the front and rear axle for the 10bolt rear with 373?

 

[crazy4offroad]

Just depends on what you want to do with the truck, what size tires are on it or are going to put on it...you gonna do any towing? Offroading?

 

[coreys87]

Its got 35s with a 305 soon to be 350. i tow a couple fourwheelers occasionally with my 14ft landscape trailer. leaning towards the 373s and findin a 5speed to put in it somehow. anyone done it before?

 

[crazy4offroad]

3.73s or 4.11s would be even better, and if you plan to go bigger down the road I would keep the 4.56s under the bench. I dont think it would be real hard to do an NV4500 and I think NP241 transfer case but you'd more than likely have to redo your driveshaft lengths.

 

[coreys87]

yea i planned on keeping everything. looks like ill throw the 373s in it.

 

[coreys87]

so i cant use the current transfercase? curious as to why... thnaks

 

[crazy4offroad]

You might be able to if the adapter between the t-case/trans is the same, and the adapter sleeve is the same spline count, and/or if you can find an NV4500 from as close to the same production year as your truck as you can get. I think those had a really low 1st gear. Hopefully someone who knows for sure can chime in, otherwise google will have to be the way to find out.

 

[bucket]

What tranny is in it now? If its a 700r4, keep the 4.56 in the rear and do the front to match. If it's the 465 shift-it-yourself, then yeah, the 3.73's would be fine.

 

[coreys87]

has the sm465