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Old 05-23-2011, 08:25 AM
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Rear end for 69 c-10

Good day: I am new to the forum and am located in NC and have a 69 c-10 short bed with a big block 402.
I am looking for a rear-end for a with 373 gears. will and year interchange, or does it have to be one with coil springs?
If it does have to be coil spring differential, what 69-72 has these gears stock?
Thanks for your help, it will be appreciated.

Ty948

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Old 05-23-2011, 03:45 PM
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Why do you want to change the axle?

That 8.875" is a pretty good rear end, and the wishbone suspension is supposed to be fairly desireable as well. Replace those rubber wishbone and track bar bushings with urethane ones from LMC Truck ones, which will help firm things up nicely.


My 66 originally had a 250 6-banger with a 3-on-the-tree in it, and it has 3.73 gears ... non posi.

So I'd suggest that you simply install the desired gear set and posi carrier into the axle that you already have.

GM continued to use the 8.875 in the "newer" trucks, but the axle shafts were a bit longer. Yours (and mine) are 30 -3/4" OAL, 70+ are 31-5/16" OAL and 2WD will have a 5-stud pattern.

Personally, I like the 6-stud axles ... but if you don't, Superior Axle and Gear makes a 5-stud conversion axle, part number PA5855.

I bought 6-stud disc brake rotors from Classic Performance Products in order to retain the same bolt pattern front and rear.

You might also be interested in upgrading those rear drum brakes to 11-5/32" x 2-3/4" with that big-block. I accomplished this by swapping the backing plates and drums from a mid 70's 1/2-ton 4x4, which also use 6-stud drums.
Be advised that your factory rims will not work with either the front disc calipers or the larger drums.

See my project journal for the complete story.
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Old 05-24-2011, 02:52 PM
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Thanks, I do appreciate your advice.
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Old 05-28-2011, 02:51 PM
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What rear end do you have in it now? And what are your plans with the truck? If you plan on racing off the line or hauling a trailer then 3.73, or even 4.11 (which is what mine had) is fine. But your MPG will suck big time, like around 8 to 10, which takes all the fun out of driving it at $4 a gallon. I put 3.50 in and have a 700 r4 waiting to go in. hope to be close to 13 to 15 MPG when done.

Unless you want a lot of welding work find one off a coil sspring truck. The perches are completely different and new ones need to be welded on.
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Old 05-29-2011, 10:26 PM
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Good day;
RIGHT NOW IT HAS A 308 , WITH A 3 SPEED AUTOMATIC.
WANT TO GO TO A 350 OR 373. NOT RACING, BUT NOT A DAILY DRIVER EITHER.
JUST WANT BETTR PICK UP, WITH THIS GEAR I AM ONLY GETING 10 MPG, HAS TO GET BETTER.
THINKING ABOUT GETTING SOMEONE TO CHANGE THE GEARS OUT, I HAVE ONLY DONE IT ONCE, A LONG TIME AGO.

WHAT DO YOU ALL THINK THE BEST WAY TO GO IS, I AM OPEN FOR SUGGESTIONS?


TY
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Old 05-31-2011, 10:41 AM
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Well going to up 3.50 or 3.73 will not give you better MPG, more like worse. I went from a 4.11 to 3.50 and gained a couple of MPG. 3.08 gears will be sluggish off the line but better on the gas tank. Those three speed auto trannies really suck the gas. I would consider an overdrive, 700r4 or 200 4r if you want to increase MPG. The 700 has a lower 1st gear than the th350 or th400 so that would help off the line.

The problem with the highway gear you have now is that guys tend to give it more gas off the line to compensate for it being so sluggish. Be patient off the line and come up slowly or change the tranny for better MPG.
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Old 05-31-2011, 09:26 PM
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Hi Barn wl;
So you think I would be better off to keep the rear end and change the tranny. Haven't thought of it that way. I have a 3 speed streight tranny,but don't know if thaat would be better. or worse.
What is a 700 r4. haven't heard of that one?

Ty
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Old 06-01-2011, 10:28 AM
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Ty,
the 700r4 is a popular overdrive tranny that swaps nicely into the Chevy trucks. It is not as strong as the TH350 or TH400 (you probably have one of these in your truck now) but those were designed for low end pulling and not much for higher speeds. As I said the 700r4 has a lower 1st gear but the rest are higher so the engine does not have to strain so hard to get you to freeway speed. My truck was turning over 3000 rmp at 65 on the freeway, with the new 3.50 gear and the 700r4 I will be around 1900 at the same speed. That translates into much better MPG. but with the 3.50 gear and the low 1st in the tranny I should not suffer too much off the line.
Mike
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