Ben Brenner

I'm starting to collect parts for my '75 C10 street/strip truck build. It's going to be an LQ4-4L80E, but I'm undecided between a 12 bolt or a 14 bolt. Is the extra strength worth the weight?

Won-Ton

Nope, 12 bolt will be plenty

Ben Brenner

Good to know. What vehicles did the 12 bolt come in? I try to get everything I can from scrap vehicles.

Won-Ton

Probably best bet nowadays is a K5 blazer, C10, C15, etc. They used them until the late 80s I believe. Otherwise full size cars from the 60s to early 70s.

I am not overly familiar with 12 bolts, but I know 14 bolts very well and know how much of an anchor in a street car/truck they would be.

I don't think I have seen anybody here run a 14 bolt and there are lots of people here pushing some serious power.

Ben Brenner

Well I doubt I would ever be pushing what anyone would call "serious power". Maybe 800hp at the most. I didn't even consider a 10 bolt, as I have had bad luck with them in the past. From what you've described, a 12 bolt should be all I ever need, and should be pretty easy to find.

squarles67

A 75 C10 should have a 12 bolt rear in it already. Truck 12 bolt and car 12 bolt are a bit different but it's a 12 bolt none the less. The pinion shaft is smaller in diameter is one of the main differences.

If I were going to the trouble of changing the rear end I'd just put a 8.5" 10 bolt out of a later model truck.

Won-Ton

I don't know, in my book 800 is pretty damn serious. Sounds like a fun project

Ben Brenner

Yeah, it'll be awhile in the making. I have this really rare problem called "money", but I'm sure no one here has a clue what I'm talking about hehe.

Won-Ton

Hahaha, yeah tell me about...It will be three years this April for my project.