'77 rear wheel bearings

[chrlsful]

Hello,

And thanks for the help.
I need to replace the bearings in the rear wheels. How do I tell if I have the 2780 - 2900 lb or 3300 lb axle? I have:

Timpkin "RW 207 CCA" ($14) w/ seal "9568" ($6) - for the lighter.

AND

Timpkin "51098" ($7) no seal - for the heavier.

No tag on the axle. Rig had a V8 & C4, if that helps. Kinda like the 1st just cuz it's got a seal.

Thank ya.

 

[Rox Crusher]

All 77 had the big bearing rear-end regardless of GVWR.

 

[chrlsful]

different gvwr/bearings

All 77 had the big bearing rear-end regardless of GVWR.

Boy, that wuz fast! (esp for earlier time zone!). Thanks

all had the big bearing rear-end
That's why I put the 70 on the 77 - to do the rear discs etc.
Wonder why the 2 different listings then? I can use either? Don't have to figure out the correct one before ordering?

 

[Rox Crusher]

Not sure who gave you (or where you got) the two listings but when I buy parts at the local parts houses they always ask what rear end mine has so I just buy both and return the ones I don't need.

I guess I could just open the boxes and pick the bigger of the bearings and seals and save myself the return trip.

 

[Viperwolf1]

GVWR is based on more than just bearing size. Spring rates and tire size also factors in. That's why there were different GVW ratings in '77 but only one bearing/seal size.

The correct seal is #51098. The correct bearing is #514003.

 

[Apogee]

GVWR is based on more than just bearing size. Spring rates and tire size also factors in. That's why there were different GVW ratings in '77 but only one bearing/seal size.

The correct seal is #51098. The correct bearing is #514003.

To add to Viper's post, he provided Timken/National part numbers for the big-bearing application. The SKF seal and bearing numbers are#15142 and #88128RB respectively.

 

[chrlsful]

ask what rear end mine has so I just buy both and return the ones I don't need.

Don't have the cash (yeah, this is a real budget operation) & don't know which rear end I have (beyond that stated above). The listings came offa the 'puter @ wrk ( a big box prts store).
Yhanks Roxs, I may try that anyway...

'llo again Viper
correct seal is #51098. The correct bearing is #514003.
OK, Thanks! Might B able 2 get seals -

Apogee - what's SKF - nother manufacturer? Store I wrk @'s only got Timpkin...

This all started when I thought I'd do something smart (my mechanic friends say "Don't think, Chad, it's dangerous for U."). Took my spare axles & tried to fit some bearings on...try n save some steps - press em on B 4 I pulled the 1s from the rig. Bearings didn't fit. Well, after close to 30 yrs. of collectin prts (none labeled but track bars) I realized I got no BB axles... So wanna do it w/out alotta steps.

 

[DirtDonk]

Well, at least you found out that you don't really have any spare axles!
Now you've got your "waiting to go on craigslist" axles. Or a trade to a member here with something that you do need.

Good luck with the bearings.

Paul

 

[chrlsful]

which product to order

Well, at least you found out that you don't really have any spare axles!
Now you've got your "waiting to go on craigslist" axles. Or a trade to a member here with something that you do need.
Good luck with the bearings.
Paul

Hi again Paul!
Yeah, over 25 yrs of prts goes along with the house if I can't get some work. : cry:

Anyway, which (of the above) do U think I should order?

Viper's look like the ones?

 

[DirtDonk]

...Anyway, which (of the above) do U think I should order?

Well, I always do what was suggested earlier and buy both. But since you can't, and if you're still driving the thing and can't just take the existing bearing out and verify the number, or just take it with you to compare, then I'd have to say go with the large bearing recommendation.
Problem here is the same as you're finding at the stores. The reason their computer lists it is because whoever supplies their data entry has the same info a lot of others have. In the Timken book it still lists '77 with the two separate bearing sizes and three different seals, depending on which axle.

But all info here that we've gathered over the years states that the '77's only came with the big bearing. And since '77 was a last year of production thing for the EB, it's easier to trust the info here than what you find in the books!

So while you may have the one-and-only '77 with a small bearing rear end (and of course it could have been swapped at some point too!), you're stuck with buying the big one and crossing your fingers. Which has a 99% chance of working just fine.
Do you know for sure that no PO has ever swapped out your rear diff?

Oh, and just to add to the confustibulation, this Timken book lists the part number as 514003"P"

Paul

 

[Viperwolf1]

When in doubt, pull it out, and measure it.

SMALL BEARING DIM'S...2.835" O.D. / 1.376" I.D.
LARGE BEARING DIM'S...3.150" O.D. / 1.531" I.D.