Opened Up The Old 489

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Daves69

Daves69

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Opened up the old 489 (broken 5.13) to see what is needed to make a good one.
489CaseRingGear.jpg


489RingGear513.jpg


Had a bit of trouble with the ring gear bolt removal as they had some (Lol) "offset" to them.
489RingBolt.jpg


But "I think" I'm good on the SG. All the internal gears look good. Splines look good. The cones look good as well and I see no signs of any bottoming. I can see the tooling marks in the bottom.......
489PassSideCup.jpg


489RingSideCup.jpg


489SGGears.jpg


What's your opinions on this sure grip folks?
TIA
 
Cool, variable gear ratio AND launch delay bolts. :D
Man that thing was hammered on.
 
I have a set of Richmond 5.38 still on the carrier, I will sell the ring and pinion if you are interested.
 
You need to measure the clearance into the bottom of the cone receivers, so you don't have to pull it out again soon. I do this with electronic solder, you know, the thin stuff. I snip off two pieces about 1/2 inch long and lay them in the bottom where the cones come down. Then I put the cones in there, and with a big brass drift (pirated from an old graintruck rear), a beat down on it a couple of whacks. Then I pull the cone out, retrieve the solder, and measure how flat it got pounded.I am looking for the solder to be .080 or thicker. If it's down at under .040, I machine the face off the cones to get the .080 that I am after, for a long operating life.
To get back the spring preload, I get me some side-gear washers from the Ford dealer, and stuff one in each side. Later after it's all prelubed with the special recipe of oil and additive, I measure the breakaway torque and turning torque.
The turning torque that I have found acceptable on the street with my 367, is 120 ftlbs minimum. I adjust that with those side-gear shims, until I get it. This works well with my 295s and also with my 325/50-15 BFG-DRs . 120# is too tight for 245s, and I think almost borderline too tight for 275s
If you set up at 130, it will skid the inside tire on every Part-Throttle turn, so basically acting like a spool.
Down at 100 ftlbs, it will often shift torque left to right and back as the traction, and power input changes. I think the sweetspot on the street is 115 to 125, so that is where I set all mine. And remember this is with the Whale-oil additive, prelube recipe installed where it needs to be.
It will read different without the whale-oil, and also different with synthetic, so I cannot speak to other concoctions.
 
Last edited:
TrailBeast said:
Man that thing was hammered on.
Click to expand...
This was from "back in the day" and sitting in a bucket since. So I guess time does not heal all!

sireland67 said:
I have a set of Richmond 5.38 still on the carrier, I will sell the ring and pinion if you are interested.
Click to expand...
Hey, thank you for the offer. Already have a complete replacement 742 (5.13) though. I'm really considering a better cruise gear for this pig.

SGBARRACUDA said:
I have some gears also if you need some.
Click to expand...
A 3.23 might be too far for me but possibly a 3.55 or a 3.73. A 3.91 is more than I want.
 
AJ/FormS said:
You need to measure the clearance into the bottom of the cone receivers, .................................so I cannot speak to other concoctions.
Click to expand...
Excellent! Saved this to my reference notes. Even though it's going cruise I'll give it a shot. Simple test and it can't hurt to know the clearance. Thank you.
 
I pretty sure I am changing out the 5:38 for around a 3.73 gear.
3.91 are still to low for highway travel. 3.23 are too high down low for around town.
 
I find cruising at 65=2200 very relaxing; this is 27s and 3.55s and .78od. Final drive of 2.77,lol.
Altho I have not yet tried it, I believe my 367cid with just a 276/110 cam, would be happy with 3.23s.I've just been too lazy to slam the pumpkin in there. Plus, I'm not quite ready to give up my second gear ratio of 6.78.....3000@35mph is just a foot stomp from tirespin...3.23s would drop that to 2730 and I'm not sure she could break the 295s loose at that rpm. And since she cruises so sweetly at 2200, I'm just gonna enjoy it like it is, for a little while longer.

I had some 5.13s also, that spit off RG-teeth . Or was it 5.38s, I forget now.
I tell you what tho, 4.30s are tough.
 
A little update for WIW.
Check the pinion gear that was in this 489. Looks like a 742 to me..........

Gear1.jpg


Here's the "crush" sleeve they used behind the outer bearing........

Gear3.jpg
 
The larger pinion bearing is in fact from a 1 3/4" , 742 gear set. M803149/M8031101 is the bearing for a 742 case? Interesting, this was somebodies home brew.
 
SGBARRACUDA said:
.....M803149/M8031101 is the bearing for a 742 case? Interesting, this was somebodies home brew.
Click to expand...

Yep, this had the M804010 race (489 casting )and M803149 bearing. I sent a couple of pictures to Cass for his take on it and an order for a 3.73 tapered 10 spline to replace.
 
I've had a couple of sets with 742 gears in 489 cases. Seemed to work good but the pinion seal always seeped a little. Kim
 
Finally got around to this pig again. New 3.73 R&P tapered 10 spline. So first time for me attempting to set one.
I'm at 20" pounds turning force on the pinion with .036" worth the shims, and .006"-.008" backlash 4 spots around the ring.
I know already my painting skills are lacking here but what are your thoughts on the pattern at this point? .......
PatternAssessment.jpg
 
pattern looks dead on -- you should have no issues with that gear as long as the pinion bearing preload is correct and at 20 inch/lbs you should be good -- you measured the pinion preload with just the pinion in the case ( no carrier/ring gear installed )
 
Thank folks. I do appreciate the input!
I had a little help the with the "old school" setup fixtures and '71 FSM. Lol, I must have gone through the measurements a half dozen times before I grew nerve to press the bearing on the pinion with the shims behind it. My concern was possibly going too deep and having to pull the bearing.
489CasePinionGearDepth.jpg



john-9 said:
...........you measured the pinion preload with just the pinion in the case ( no carrier/ring gear installed )
Click to expand...

Yes I did. But since this is my first time it's all a bit of a blur to me, (kind'a like this picture)!
489CasePinionGearPreLoad.jpg
 
Pattern looks good. You should be good at 20 inch pds preload. I use 25 with new bearings so your right there.
 
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