badattitude

Can a used pinion gear be used with a new ring gear? Both are OEM Toyota, the pinion is ok, but suspect, has 120,000 miles on it. The ring is new.

thanks

Beto

Bad idea from what I know. They wear together as a set and mismatching them will create accelerated wear and could result in premature failure. I went with a junkyard matched set when I broke the ring in my TRD locking diff.

The risk might be overstated, but it's a pretty expensive part to gamble with like that..

SpecialScottie

For the time or money of installing one, I would just go new

scuba

Not a good idea.

Junkyard Dog

I, too, think it is a bad idea... Placing a new ring gear with a 120k pinion will be hard to set up and have the proper backlash. They pretty much wear as a matched set.
Better to go with both components new and have them set up properly (IE using a dial indicator, and prussian blue to ensure proper mesh) to avoid a noisy rear and premature wear...

Tony

badattitude

Very good feedback and much appreciated.

I've got a truetrac being installed right now at a shop down the street. My R&P was in bad shape. It's been making noise for three years. I had a cheap OEM ring lined up but no pinion. Sounds like it's smart to pay extra for the packaged set while we're in there.

Junkyard Dog

Might cost ya some extra $$, but that would be the route I would go.
Hopefully you have a mech that has set these up before. It's pretty critical.

Good luck

Tony

dropzone

iTrader: (6)

Might as well throw a new master install kits (all new bearings/shims etc) and use a solid pinion sleeve instead of a crush sleeve, do it right and do of once

badattitude

The mech was confused about the 4 cylinder gear vs the V6 gear set. I think he ordered the 4 cylinder gear set and wants to use it. I'll verify today. I'm not confident I'm getting good work. There's already things I wish were done different. Like buying the R&P before teardown and also using a solid spacer. In hind-sight I should have bought one of those fully built thirds online.

Nelsonmd

Hmmm, It sounds like you should get out now if you aren't on the hook for a bunch of money with them.

If I were you, I'd find a way to watch over his shoulder when he does the work. Do a little research so you know what you are looking for. Here is a good site.

http://gearinstalls.com/

And definitely get a new matching set of gears.

badattitude

Yeah, I've been reading gearinstalls.com and think I know more about setting up the diff than this shop does. sad

unfortunately, I have to let the shop finish at this point. It's my only car and I want it back. I'll get the new gears for sure AND make sure they are the V6 gears even if takes another day.

I'm getting the oringinal 4.10 but would have liked to consider 4.56. The choice was too much too deal with right now. This is already a PIA without bringing in that extra variable. I don't want these stooges touching the front either.

By the way, I did provide a new Yukon master install kit with all four bearings when I dropped of the truck. It would have been a lot cheaper to purchase the install kit and R&P together!

Nelsonmd

Glad to hear you are on top of it. You should demand the notes from the rebuild as well to verify that they shimmed it right. There was one example from Zuk's site of a shop badly mis-shimming it causing problems. If you can convince them to take pics of the contact pattern, that would be good too.

I am very interested how this comes out. This may be in my future as well, or I might try to do it myself.

Nelsonmd

BTW, just found this from Zuk on using the 4cyl gears on a V6 diff.

http://gearinstalls.com/cus.htm

I wouldn't trust them with this, though it apparently can be done.

badattitude

Thanks for the link, It looks like it's ok to use the 4cyl gear, wow. Still, not what I would prefer.

This is a good 4 cyl into V6 link too
http://gearinstalls.com/abe.htm

I'll post the outcome when I get my truck back, hopefully later today.

badattitude

Mechanic called this am and said he could not set up the Motive gear TV6 set. They shim the pinion an extra .100 thou. and the pinion still won't mesh in the ring correctly. So they asked me to source a new R&P. I called a couple shops but placed the order with Seven Springs Complete Offroad in Iowa. They have great prices and customer service. The new Yukon Gear TV6 R&P should arrive by 10:30am Friday. I wonder if my shop got a 4cyl pinion in a TV6 box. The gear they had should have worked.

badattitude

I am not suppose to have these

The new R&P set was delivered to my house instead of the shop. What else could go wrong. I had them delivered from my house to the shop via taxi.

These are the Yukon Gear TV6. These should fit, right?
1999 4runner in pic

badattitude

So the mechanic called Monday and said my "truck is ready but you're not going to like it". I like his honesty but the truck makes a terraible whine at 40-50 mph, upon acceleration.

Somthing's not right. He wants another R&P but I can't afford another one. He wants an OEM 4runner R&P. The oringinal Toyota R&P looked just fine to me but he said it had a herringbone surface and didn't like it. And he also has the Yukon gear pictured above. So that should be enough to choose from. The Yukon gear is in my truck now. We have .145 thou of shim under pinion head. He said he needed that much shim to reach the ring gear.

So....I will have to take it back for one more try. The fact that he is local makes it my primary option right now. He says the Toyota R&P had 40 teeth on the ring and these aftermarket TV6 gears have 37. They are both 4.10 ratio becasue the pinions are different?

Yukon gear has 37 ring teeth and 9 pinion teeth
Toyota gear has 40 ring teeth and 10 pinion teeth

Nelsonmd

Dude, that sucks. This guy really sounds like he doesn't know what he is doing.

You should e-mail Zuk and ask for his advice, or someone else that might know more.

badattitude

Thanks Nelson, it's been a roller coaster for sure.
ZUK actually did PM some good advice.
Right now I'm going to take the next couple days to fiqure my next steps. This is my daily driver plus a little seperation between me and the shop is smart. I'll reevaluate in a couple days. At least I can drive the 4runner, it's drivable.

Plus, the Truetrac works really nice, even in the snow and ice. Good Times

badattitude

I finally let the diff shop try again today. They took the Yukon gear out and put back the original OEM gear. Now, its nice and quiet, done.

They couldn't say why they could set up the OEM but not the aftermarket gear.

I'm courious why the OEM ring has 40 teeth while the Yukon has 37. I know the ratio is the same bc the pinion is differant as well, but why are they differant at all?

It may be my imagination but I think the Yukon gear 4.10 felt like a lower gear than the OEM 4.10. I drove both sets a quarter mile in 4WD on dry pavement with no issues.