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corporate 10 bolt axle: to rebuild or not rebuild

skelly1

skelly1

1/2 ton status
Joined
Sep 2, 2002
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San Diego, CA
So the 1990 V15 has 235K miles. I just got a factory reman'd 700R4 installed with a cooler. The old tranny was original and everything was worn out, but what the hell, it made it 235K. The Blazer's been screaming tranny for 20K miles before it finally lost 3rd. It's also been screaming rear diff for at least as long. It's the corporate 10 bolt which apparently is not that good for off road durability. I am now married to it, somewhat limited budget, but I am not sure that I want to spend a thousand bucks rebuilding a corporate 10 bolt, that's going to need everything.

Here's the questions: What's a good alternative stronger rear diff that's still 6 lug? I know about the 14 bolt, Dana60 etc. that are 8 lug. The Blazer has the corporate 10 bolt in the front too. Very low off road miles, I'd like to change the gears up front and that's it. Now for the gears; She's got 33's right now with a 4" lift. 3:73 gears. Kind of doggish on the hills, and I don't want to hurt the latest 700R4. What's a good ratio for 33-35" tires? I'll never go any bigger than 35's. Thanks.
 
you could go with a 14sf they are still six lug /forums/images/graemlins/smile.gif 4:10's are good for 33 and with the 700r4 id say go with the 4:56's for a 35in tire /forums/images/graemlins/smile.gif
 
I agree with mudhog. or you could go with the ff14b. you can find these for pretty cheap. then just swap your front lug to 8 with the knuckle out off of a 3/4 ton. either way it will be cheaper than rebuilding the 10b and it will be much stronger /forums/images/graemlins/thumb.gif
 
Thanks, how about the drive shaft? Will the length need to change? It needs to be lengthened since the lift already. Are the U-joints the same size?
 
14 Bolt SF is will bolt in, it's 6 Lug, and stronger then your 10 Bolt. I still like the 14 Bolt FF much better, I'm putting in a set of matching axles (from same truck) from from a 3/4 ton truck I picked up for $250.00 . I'd reather buy 8 lug rims then regear an axle to match what I have or am installing. What gears does your 10 Bolters have ??? If you plan on going to larger tires in the future, or already have larger then stock tires, Lower gears are a must !!! 308's with 35" tires = burnt out automadic transmissions !!!! So it may be cheaper in the long run to replace both your axles with a set that has the better gears then and 8 lug rims then keep replacing trannys.
 
If you could find a 14b sf out of a 2wd 3/4 ton truck it will have the six lug pattern you are looking for. The half ton 2wd with the 14b sf are five lugs so they will not fit. You will need a trick u-joint. Napa #447 I believe. If you need to lengthen your driveshaft now then you will need to do so with the 14 bolt. If you do alot of highway driving I would go with the 4.10 It will give you good acceleration and good gas mileage. If you are wheeling alot and don't care about gas then go for the 4.56 /forums/images/graemlins/burb.gif
 
i also vote for swap to at least an SF 14 bolt over the crap 10 bolt, cept that the gov-loks are shyt, so hmm..

5 lug under 2wd and 6 lug under 4x4 for the 9.5" 14 bolt SF's, this goes for 1/2 ton,

3/4 ton SF are 8 lug just like the FF always were

and yeah there are billions of 4.10 ones out there of both flavors, is very super common ratio


good luck
 
a 12 bolt will do you fine to ya'no /forums/images/graemlins/cool.gif

/forums/images/graemlins/usaflag.gif /forums/images/graemlins/truck.gif
 
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