I was curious to the differences between the vacuum disconnect and the non-vacuum disconnect. What are the differences and which is better? and why?

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1980 Jeep CJ7 Buggy
SOA, D44/ FF14B, SBC 350, SM465, NP205, 108" WB, 37" MTs

http://www.dpgoffroad.com/
http://www.ucora.org/
http://www.christianoffroad.com/
http://jeepinbyal.com/

vacuum, you have a two piece axle that have a sleeve that engages the two on side to to lock it the entire axle...it's a weak point on that type of axle...a regular hpd30 has one solid piece so if it would brake, you can much more easier replace that axle shaft...also you don't have to worry about the axle not engaging or opposite

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02 Jeep TJ Sahara, 33's locked up front
03 SAS KJ 0n 35ish boggers(Sold )
Petersens 4wheel: http://www.4wheeloffroad.com/featuredve ... index.html

how can you tell if it is the vacuum disconnect or the non?

I found a HP D30 from a '91 XJ

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1980 Jeep CJ7 Buggy
SOA, D44/ FF14B, SBC 350, SM465, NP205, 108" WB, 37" MTs

http://www.dpgoffroad.com/
http://www.ucora.org/
http://www.christianoffroad.com/
http://jeepinbyal.com/

Something like this big ugly casting will be on the pass side of teh axle tube:


Avoid.

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99 TJ
71 C101
04 KJ
03 SFA KJ Sport
LOST JEEPS So-Cal

easy enough, thanks!

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1980 Jeep CJ7 Buggy
SOA, D44/ FF14B, SBC 350, SM465, NP205, 108" WB, 37" MTs

http://www.dpgoffroad.com/
http://www.ucora.org/
http://www.christianoffroad.com/
http://jeepinbyal.com/

Can they be rigged to be locked at all times. Might be worth it if it was cheap enough.

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Feb/2006 Silver Sport 4x4 CRD

Free is to much for a vacu disco HP30.

You can install a block off plate and regular axles. That is a common fix for them on vehicles that have the disco setup. Still not worth using on a SFA conversion even if free like Troy said.

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99 TJ
71 C101
04 KJ
03 SFA KJ Sport
LOST JEEPS So-Cal

Point taken I might get an 84 v6 XJ for free from my friend. I was going to beat it and then pull the axle for a later date. It is most likely a junk axle huh?

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Feb/2006 Silver Sport 4x4 CRD