Blizzard

Hello,

I've broken 3 teeth of my ring gear (7.5'' IFS Diff) and also have my pinion damaged.

My diff code is G295, the 29 is 4.100 diff ratio.

I think I can use a Randy's Ring & Pinion set, the YG T7.5-411.

I have also seen in other sites the 4.11 diff ratio and I'm not sure.

Are 4.11 and 4.10 gears the same? In the Randy's site says YG T7.5-411 7.5" TOY 4.10 R&P so I'm confused...

Is this the same as Randy's Ring & Pinion? It's cheaper...

I'm student and have little money, this sucks!

Thanks,

David

mt_goat

If you take the # of teeth on the ring gear and divide that by the # of teeth on the pinion gear you get the gear ratio.

All gear brands are not the same, some are higher quality than others. Unless you are going to sell the truck right away stick with the better brands, like US gear, Precision gear, or factory Toyota gears. You may be able to get the Toyota gears from a salvage yard or someone on-line that is upgrading to a higher ratio because of bigger tires.

http://www.precisiongear.com/home.htm
http://www.usgear.com/

BTW, Yukon gears are usually just repackaged US or Precision gears, but ask for the maker before you order them just to be sure.

Blizzard

Thank you mt_goat.

US Gear haven't 4.11 7.5'' R&P, so I must go with Precision Gear.

Performance Products have the Precission Gear 4.11 Diff ratio for 208$, is it a good price?

Are Randy's bad gears?

And my last question... Will I have problems using 4.11 gears? My diff code says 4.100 diff ratio and those gears are 4.11, don't know about the number of teeth...

Thanks,

David

mt_goat

That price sounds about right. Randy's had Yukon gears last I checked. Yukon gears are usually just repackaged US or Precision gears, but ask for the maker before you order them just to be sure.

I don't know why they have 4.10 and 4.11. Maybe one has a little bigger pinion gear or something. Do you have a V6 or Turbo 4 cyl or what? May want to call Randy's and ask them. I would keep them exactly the same as the rear diff what ever that is.

Blizzard

I've a 3.0 Turbo Diesel 4Runner...

My diff code is G295, 8'' Diff, 4.100 Diff Ratio and 4 pinion LSD (Rear).

The front diff is an ADD type like american ones.

Calling by phone to the States is difficult to me, the hour difference, the spoken English and I'm all day at class or in the job...

No one have a G294 or G292 diff code? The front diff would be the same...

I also could count the number of teeth of my gears.

Tomorrow morning I'll be watching my truck.

I'll see...

Thanks,

David

Blizzard

Well, I've just returned of the garage.

My ring gear is 41 teeth and my pinion gear is 10 teeth, so 4.10 ratio as expected.

Precission Gear 4.11's won't work because they're 37 and 9 teeth, so 4.111 not 4.100 as I need.

Don't know for sure if Randy's Ring & Pinion are 4.10 or 4.11, they've a tech number (425) 348-9002 but it's difficult to me the spoken English, furthermore the hour difference...

Someone could call them and ask if their YG T7.5-411 Ring & Pinions are 41 and 10 teeth? I'd be very grateful if anyone can...

If not I think will be better for my money changing the rear and the front gears to 4.56 (4.88 are lower in excess for my, planning to run 31's).

Thanks,

David

mt_goat

Ok I called and now I remember why I didn't order my gears from Randy's before. The sales people are (I going to be nice here) not very knowledgeable. One told me the the 4.10 had the 41/10 gear count. When I called back and talked to another guy he said he said the 4.10 and the 4.11 were the same ratio. When I told him the 4.11 had 37/9 gear count and the 4.10 had a 41/10 gear count he said well you always want the front to be a little different than the rear anyway, so theirs would work. I told him I didn't think so (BS). I admit that the difference is minor, but to say that it is actually better to have them different is IMHO a lie.

Then I asked who made the gears, he said Yukon makes them. I told him I didn't think Yukon made gears, just repackaged other brands. He said they make them. Then after basiclly calling BS on that too, he finally admits they these are make over-seas but he didn't know where. My bet is China.

So if you are wanting to buy new gears I going to recommend going straight to one of the makers of good quality gears (like I posted earlier) and ask for a distributor rear you.

If you are wanting to stay with 4.10s I still think you should try a local salvage yard for a match and you could get a complete used diff with the gears already installed and ready to go.

Blizzard

Thank you very much mt_goat.

I've done an Excel table to calculate the different speed/rpm's differences, for if I change the front and rear ratio.

I have noticed (And also with Matti's comments) that I can run up to 33's with 4.10 ratios, because the diesel engine has a lot of torque at low rpm's and is not good to exceed frequently the 3000 rpm's.

Now with 4.10 and 30's I travel at 120km/h (74.56mph) at 3000rpm.

With 33's I'd go 120km/h at 2700rpm and it's good! It would drink a little less gas and in 4L wouldn't be so so long ratios for my engine.

I'll try to find a yard R&P. Soon because I've the truck stopped and I need it a lot.

Thank you for calling for me

David

mt_goat

You are welcome, I learned something too.

superjoe83

i just thought i would add that some manufactures did put different ratios in the front and rear diffs, for example, my friends mid 70's 1/2 ton Chev has 3.07's in one and 3.08's in the other, I'm not sure why, but they did

Blizzard

I've been all the afternoon calling to yards asking for 4Runners but... ลลลล, only one... (Those trucks are too much good!) The guy wanted me to buy the whole diff, 465€, this is 601$!!! He's crazy...

What happens if I run 4.11 gears front and 4.10 gears rear? Obviously I'd only drive in 4WD in the trail, not in the road...

If it's dangerous (It's my daily driver) I'll buy 4.56 gears front and rear and seize the opportunity to install a new locker rear...

This would be more expensive but like we say in Spain, you kill two birds with a shot.

Thanks,

David

mt_goat

If you only use 4wd off-road it may not be make any difference. Where it would possibly be noticeable would be in 4wd on snowy or icey roads with patches of dry pavement. Around here we have ice storms where the roads can be like a skating rink, in these conditions the slightest wheel slipage can send you sideways. With the difference in gearing one set of wheels will be forced to slip a little bit to keep up with the other set. It is a minor difference though.

I once tested out a truck with 5.29 gearing on the rear and 5.71 gearing on the front and it would only go about 10 feet on dry pavement before the binding would be very bad, like someone was applying the brakes.

Blizzard

Well... I usually shift into 4WD when raining but I'm going to install the Aussie Locker I bought in front when I've the new gears, so I think I musn't drive with 4WD and the Aussie in the road, altought rainy road...

I'm doing maths, seeing if I change both gears to 4.56 and put a Detroit Soft Locker rear or what the ˟˟˟˟˟ I do...

David

yotatruck88

It is ok to run different ratios front and rear as long as they are only xxpercent apart(i dont know how many percent..look it up on toyotaoffroad.com (search it) but yours i know FOR SURE will be ok with 4.10's and 4.11's