The Stovebolt Site Forums The Shop Area Driveline Got my 4:10 Eaton

Picked it up recently from CA..got it on the 67-72 board..1968...looks like it is in good shape, bearings look good and gears are in great shape. Guy who shipped it built a nice wood box for it.

I found a guy in PA who has two H0-52 4:10's out behind his garage. He was looking to sell them pretty reasonably but he is slow on the email.

Pumpkin

codes

Congrats!

It is going in my 49 3600. Gotta thank Gmoniz and Denny G for all of their help.

What does the 3600 have in it now?

4:57

Could you have gone with the 3.90 out of a TF? Isn't this a 3/4 ton truck?

Is it an established fact that 3.90 was indeed available in 3600 (3/4-ton) trucks? I don't think the literature bears that out. See here. Half-tons, 3.90, sure from 54 on.

Well..my super skeptical and detailed brother in law who is a truck mechanic dropped by and insisted on tearing the pumpkin apart. Not bad but not great, there are a couple of marks on the inner bearing races. He took the pinion assembly to the shop to examine it further. Quite a job persuading that to come out - and pulling the bearings.


Better to find this stuff out now. So it is off to get some KD11786's. but I'm in no rush and enjoy this stuff

I checked around on bearing prices...the complete bearing/race combo is pretty expensive here - running $60-70 (National KD11786Y), local bearing house won't sell national (offshore sources apparently and cheapo), they sell Timken - parts 388A (bearing) $27 and 382 (race) $17 so the individual parts are cheaper. Pinion seal (41133ON) is just under $16.

Rockauto has the 388A at $17.74, and the 382 at 10.80. The 41133ON is 9.68. But shipping to Canada is $35.19 and they want 9.68 for taxes up front. I'll go local.

I'm going to try to set up the rear end myself with the help of brother in law who is a truck mechanic. I've got a good dial indicator for backlash, I'll have to find some die for teeth contact for setting pinion depth. If I run into trouble the local truck repair shop said they would help with the final adjustment if we can't get it set up properly. Manual looks pretty straightforward tho and I've got a couple books on tooth contact patterns.

Funny, local truck shop doesn't call them Eaton rear ends or HO52 or HO72, they just call them GM read ends.

I bought a tube of Prussian Blue at NAPA for setting the mesh pattern.

Glad you found a gear Randy. Setting it up is pretty straigh forward, you shouldn't have any problem with it. Sounds like you've done your homework and if you stick with the instructions in the service manual should come out just fine.

I'm still lookin' for one for my '54.

Denny Graham
Sandwich, IL

Thanks Denny you were a huge help. And Gmoniz too.

I'm going to fab up a tool like I found on one of the chevy boards to set up the carrier bearings, looks simple but effective - bend some bar stock and weld on a nut.

tooltime

Now bro in law says to pack the pinion bearing ( and the carrier bearings) with grease, but others say this is a no no - won't allow axle lube in and may cook up the bearings.

I like to assemble them completely dry so's not to attract any dust/dirt. After installing & filling with gear lube I run the motor with trans in low gear while thevehicle is SAFELY still on the stands. This lets the lube get splashed up thru the bearings BEFORE any load is applied to them.
Doug

Anyone got a part number or source for the carrier gasket and the gasket on the pinion bearing retainer?

Well..no luck up here on the gaskets.

Carrier gasket (to housing) is NAPA P29129, rear cover gasket is P39130, none available anywhere in NAPA Canada. No pinion gasket listing at NAPA.



Pinion retainer gasket is GM 3758222, about $3 at Randy's Ring and Pinion and $40 to ship it here LOL. Local GM dealer laffed at the number said it has been obsolete for years.

Interesting, it looks like the shims they sell are for the H072 and they go behind the small pinion bearing at the end of the shaft, not behind the main bearing races. Odd.

Felpro looks like RDS5088 carrier gasket and RDS50590 cover gasket, no pinion gasket listing. Not sure who carries those up here.

It is a challenge up here sometimes.

I don't bother with the gaskets on my rebuilds. Just lots of Ultra Black RTV.

Be careful with that pinion shim setup. There are two different designs I have found. The shims going behind the small bearing are for a different style of gear with a different size 3rd bearing snout.

I got a rear cover gasket for my HO52 at Auto Value. Not sure if you have those in NS. Maybe order online?

Never heard of them. I'll try them online I guess. I think you guys have way better options out there than us.

I gotta say, I might just use RTV next time. The stamped rear cover is hard to get sealed with the gasket, even with adhesive. Still have a drip.

that is good to know..maybe RTV is the way.

I'd go with RTV, Permatex Ultra Black is what's used by the gear shops - let it cure well, trim it off, looks nice

Bill

On the old rear ends it is important to have the gasket, between the third member and the axle housing, to maintain the proper distance, to centerline.

Just to refresh the info because the gaskets were a little tricky to find. I bought them today at O'Reilly Auto. Also available on their website. All for HO52's and HO72's.

Rear diff cover gasket Felpro RDS5088

Diff carrier gasket Felpro RDS5090

Axle flange gaskets Felpro 3458

These are the Felpro part numbers, not the O'Reilly numbers so you should be able to cross reference them at any auto parts store.

Peace,

Maybellene

Got around to my installation yesterday. The gasket listed for the rear axles is not correct even though it cross references through the Felpro catalog. The two gaskets for the differential are correct.

Several posts have inquired about actual performance increases when looking to increase top end. For those interested in my field test results...

Testing was done using a GPS and calibrating MPH on the GPS to the reading on my speedo.

Switching my '57 3600 from STA Super Transport 8x17.5 bias plies to Bridgestone 8R19.5 12 ply radials gave me a pick up of 10% MPH. (Good luck finding the 19.5" rims!) I anticipated an increase of 7.5% when I did the calculations based on published tire specs by both manufacturers (based on the difference in circumference), but actual increase was 10%.

Changing my 4.56 rear end to a 4.10 gave me another 10%, exactly as the math indicated that it would.

Independently, either of these alterations would pick up 10%. Doing both gives a compounding effect and actually picks up 21%.

Before the change, my comfortable highway cruising speed was 52 MPH. I can now run 63 at the same tachometer reading.

Thank you to Denny Graham for his postings on the pumpkin conversion. He gave me the courage to give it a try. (If the pumpkins weighed about 20 pounds instead of over 100, this would be a piece of cake!) And thank you to Steve Reid for selling me his extra 4.10 and the fifth 19.5" rim so that I could mount a spare under the truck.

By the way, if you convert to 19.5's and your spare is currently a 17.5 with the factory under-bed mount, anticipate having to adapt mount. (I discovered this when my new spare wouldn't fit.) The adjustable smaller cleat will need to be pushed out one set of holes and the non-adjustable larger cleat will need to be nipped 1" on each side (a 45 degree cut worked fine). This will keep the spare centered and the 19.5 will just barely fit between the spring shackles.

Peace,

Maybellene

The correct axle flange gasket is Felpro # 55350. This is a metal gasket as per original. I installed with a thin film of Permatex Ultra Black on both sides. NAPA carries it.

Autozone sells a gasket made by ROL that will fit but is made out of thick, soft plastic. It shows up in their system as a Felpro 55350, but is actually an ROL plastic gasket.

If you want a metal gasket, go with NAPA. If you have a stubborn leak and want to try something with more thickness and give, you might try the Autozone version.

Lots on gaskets, but it might save a fellow 'bolter lots of time that I spent chasing down the correct ones.

I know it's been awhile but does that guy in Pa still have those rears? I realy need a 4:10 for my 59. Pm me with his email and I will contac him. Thanks Tom T

I have used yellow ochre (the color) oil paint for checking gear contact area. It comes in a tube and acts like grease, and really shows the gear contact area nicely. It is also easy to remove with brake cleaner between adjustments.

Is the bearing on the pinion pressed or retained by a slip ring
I'm trying to change gears in my 46 3/4 and I'm using a 410 set out of a 72 ton

AlexJ

I found your name on another post as someone to talk to. I am looking for an Eaton 4.10 Model HO52 for my 1950 Chevy 3600 3/4 ton pickup. Do you have any idea where i can find one?
Sara

AlexJ has not posted since Jan 2016

Try this contact info - blackwaterfabrication@gmail.com

Good luck