gm 7.25 or 8.25 ifs

bearmedic · **Posted:** Sun Jan 25, 2009 1:48 pm

has anybody though bought swapping their d30 front for a gm 7.25 or 8.25 i came across them while researching ifs, would they be stronger?

InCommando · **Posted:** Sun Jan 25, 2009 2:45 pm

I wish that this swap would come to pass. The 8.25 is used in some failry heavy trucks. People will point out that they do break, usually half-shafts, when pushed hard but that is under a heavier vehicle.They may not be ideal for a 3/4 ton truck, but for a KJ?

Jeepjeepster · **Posted:** Sun Jan 25, 2009 3:07 pm

Not sure I would use something out of a chevy in my Jeep. It is, you know, a chevy. :roll:

Yea, sure, it would be great to swap something in but it would take a lot of fab work.. Which is something no one has tried yet. They would rather throw a SFA at it and be done with it.

InCommando · **Posted:** Sun Jan 25, 2009 3:31 pm

I don't mind my Chevy D60 or my Chevy D70HD

yeah, they are actually Dana's, but they did come from Chevies.

I am a bit disappointed about the very high lift that a SFA KJ requires to run a fairly small tire especially on the narrower axles sets. Something to replace the D30a would enable you to run almost as big a tire without getting so high, it seems. Just thinking out loud, more or less.

jeepkj02 · **Posted:** Sun Jan 25, 2009 5:58 pm

Probably require as much time and money to get it to work as a solid axle conversion.

InCommando · **Posted:** Sun Jan 25, 2009 6:15 pm

Probably

tjkj2002 · **Posted:** Sun Jan 25, 2009 8:08 pm

No lockers or LSD's for the GM's front IFS diffs,they are still alloy,and be prepared to do output seals often.Oh and the gears are about $350 for those GM IFS diffs also.

InCommando · **Posted:** Sun Jan 25, 2009 8:20 pm

SOME other center section, maybe ferd,???

MidnightLiberty · **Joined:** Mon Oct 08, 2007 6:42 pm **Posts:** 270

Or Toyota perhaps. Heven't they been IFS for 15 years if not longer.

tjkj2002 · **Posted:** Sun Jan 25, 2009 8:28 pm

MidnightLiberty wrote:

Or Toyota perhaps. Heven't they been IFS for 15 years if not longer.

They have the exaxt same problem the KJ does,there diffs are alloy also.Many FJ front diffs have been blowing lately.

Learning how to drive will save your front diff,I never broke my front diff and wheeled the snot out of my KJ,no collar either and lifted a front tire often.

InCommando · **Posted:** Sun Jan 25, 2009 8:29 pm

I don't think that Toy is really a huge improvement. Remember, most of the time the majority of those set-ups are only dealing with 1/2 the HP most vehicles put out and in a lighter rig, at that. The higher out-put vehicles have a different center section, IIRC, and they are harder to come by. At least there are lockers available, though. Maybe if you did not run their birfield set-up?

The best bet would be a center section that is readily available in any boneyard, with aftermarket support, and cheap. I am going to click my heels together three times.....

Fulltimer · **Posted:** Sun Jan 25, 2009 8:39 pm

InCommando wrote:

I don't think that Toy is really a huge improvement. Remember, most of the time the majority of those set-ups are only dealing with 1/2 the HP most vehicles put out and in a lighter rig, at that. The higher out-put vehicles have a different center section, IIRC, and they are harder to come by. At least there are lockers available, though. Maybe if you did not run their birfield set-up?

The best bet would be a center section that is readily available in any boneyard, with aftermarket support, and cheap. I am going to click my heels together three times.....

The naysayers will jump right in with a lot of negative comments. Far be it for anyone to try and think new thoughts around here. I say...go for it! Check it out. It may not work but take a look and see what it looks like.

Terry

TAHOE · **Posted:** Sun Jan 25, 2009 9:20 pm

I would have no idea if they would fit, most likely doubt it, but remember, the IFS frontend from GM are pushing 5-8000# vehicles around regularly. Do they have weak points, most assuredly, but I would imagine they are slightly stronger than the ones designed for the KJ's just due to the extra weight. TJKJ may know more from his experiences, I'm just a shadetree, but my Tahoe tips the scale at around 7000#s and mine holds up just fine, no outer seal leaks either going on 120k. Lack of lockers is a drawback too

InCommando · **Posted:** Mon Jan 26, 2009 12:54 am

While many no doubt have issues, my oldest brother has an IFS k2500 farm truck with over 200K on it and has had no driveline issues.

gm 7.25 or 8.25 ifs

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