whats size centerpin for rear springs on 89 Jimmy?

[hunter]

I have an 89 GMC Jimmy 10 bolt rear, I need to add a 4deg shim on my rear springs to get the pinion angle correct and I will need new center pins.
What size are they for the rear?
Is it the same size for the front?

 

[hunter]

Nevermind...did a search, looks like 5/16"

what can I say...Im a newbie blubie

 

[79Beast]

3/8 front and back on my truck. I'm running skyjacker front and tuff country rear springs. I don't remembe if stock springs are the same, but I think so.

 

[highrlr]

Not to change the subject, but do the shims get bolted to the spring pack? I am putting shims on my Jimmy and i thought they just sat in there like a lift block would?

 

[hunter]

3/8 front and back on my truck. I'm running skyjacker front and tuff country rear springs. I don't remembe if stock springs are the same, but I think so.

Dorman makes all sizes and lengths of centering pins. Your local auto parts store can probably order you whatever size you want.

IIRC our trucks use a 5/16" centering pin however long your spring is.

As to the grade, I'm not going there.

http://coloradok5.com/forums/showthread.php?t=108575&highlight=centerpin+size

Thats my problem, I keep getting mixed answers

 

[smokkey1]

I went throught this a couple of weeks ago. I uses some 3/8's grade 8 bolts and rounded the heads off so they would fit in the spring preches. the head of the bolt was 9/16 IIRC. I got them at OSH I think they were 4.5" or 4" long.

 

[smokkey1]

http://coloradok5.com/forums/showthread.php?t=125289