88' Suburban 1/2 ton TBI 350 700R4 axles/gears ?

[glockholiday]

Not even sure what my axles are, 10 bolt, Dana this, Dana that, I'm ignorant on axles, definitely stock though since I know the history of the truck. I think I have 3.42s or 3.54s. How low can I go before I need a new carrier? The reason I ask is because on my Excursion I was told if I wanted lower than 4.56s I had to change carriers. 4.10s will put me back to stock ratio with my 33s but just wondering how far my options go. And while I'm in there I want to do a mechanical locker, Eaton, Detroit???????

 

[bucket]

You have dual 10 bolts, could be 3.42 or 3.73 gears. I don't think the 3.08 ratio was used (common in a pickup or K5). If you don't have the G80 Govloc, you can simply replace the spider gears with a lunchbox locker. Otherwise it will have to be a full carrier style replacement, which tends to be a little stronger and also gives you a couple street friendly options.

 

[glockholiday]

Awesome, thanks.

 

[glockholiday]

So how do I know if I have 28 or 30 spline axles https://www.powertrax.com/traction-...rado&crt_drivetype=_ANY_&crt_enginesize=_ANY_

And I can get a set of these Powertrax for $700, is that as cheap as they come?

 

[bucket]

If your truck was built later in the model year, it should be 30 spline. But the only way to be certain is pull it apart and check.

 

[glockholiday]

And what about ratios, is there a stopping point before I need a new carrier? Or am I even right about needing one going beyond a certain gear ratio? I'm thinking 4.10s or 4.56s so I think I'm still in the same ball park.

 

[bucket]

It's 2.56-down and 2.73-up. So you're good.