When to upgrade your 60.

[80' 427]

Honestly right now I wheel in my pasture and in a park that is small enough we can drag it out if it breaks. Still like everyone I like to wheel all day without a break down.

The truck is a 79 K30
Stock 60 4.10s with a lock right and spicer hubs.
The motor is a pretty mild BBC on LPG and the tranny transfercase is 465/205.
The tires are 39.5 13.5 Iroks.

Where we wheel is pretty mild and even beating all day my my buddy finally broke a welded 44 with 44s on it.

Are the inners going to break first? What is the suggstions?

 

[thatK30guy]

A '79 has smaller tapered shafts so that would be my biggest concern of breakage. Upgrade to newer and larger shafts and you should be ok.

 

[6.2Blazer]

From my experience and talking to others, the first to go will be the long side necked down inner shaft. I broke mine with skinny 38's and a stock 6.2 w/ auto trans. Replaced the inners with new Spicer non-necked versions, but then started wasting stock 30-spline stubs (snapped 2, found a 3rd twisted when checking them). Went to chromoly 35-spline stubs and drive flanges and have ran for years with no breakage including the last couple with much larger/heavier 39.5's.

 

[wayne]

When you start doing stuff like this to stock Spicer 35 spline inners and stubs. It's also a Spicer joint and they are not neck down inners. Done with 40" Maxxis Sticky Treps.

 

[80' 427]

I know if an outter it can kill the ujoint. What happens when an inner brakes?

 

[6.2Blazer]

I know if an outter it can kill the ujoint. What happens when an inner brakes?

Usually only if the shaft breaks at the ears. I've broken one inner and two outers in the actual shaft part and it never damaged the u-joints.

 

[82355]

I broke an outer before you. Slacker.

Martin