Front diff swap

[boy&hisdogs]

did any “light duty” 2500s have an 8.25 diff?
Mine from a 400 burb has the mounting pad angled pretty severely maybe 45°? I’ve seen numerous 800 diffs and they were all either parallel to the ground or slightly angled.

If it's a 6 lug it got the smaller diff, if its 8 lug it got the bigger diff. 1500/2500 doesn't matter.

 

[1998 K1500 Bubbles]

I need the smaller diff, I want the 3.73 gears so they match the back. I’m swapping the rear 10 bolt for a 14 bolt 6 lug axle with limited slip. I’ll check the local junkyard tomorrow if they have any front diffs with the 3.73s

 

[boy&hisdogs]

I need the smaller diff, I want the 3.73 gears so they match the back. I’m swapping the rear 10 bolt for a 14 bolt 6 lug axle with limited slip. I’ll check the local junkyard tomorrow if they have any front diffs with the 3.73s

Whatever truck you get the rear end from should also have the correct front diff. Good choice on the rear end swap, I did the same thing on mine and I'm 100% glad I did.

And just FYI, if you don't already have the rear end, be aware that you can't convert an 8 lug rear axle to 6 lug. I tried that and the brake mounts were off.

 

[1998 K1500 Bubbles]

There’s 3 2wd 3/4ton 6 lug trucks at my local junkyard and one has a g80 3.73 so hopefully it’s not gone before I can get it.

 

[boy&hisdogs]

There’s 3 2wd 3/4ton 6 lug trucks at my local junkyard and one has a g80 3.73 so hopefully it’s not gone before I can get it.

A 2wd axle is a different width than a 4x4 axle, the 2wd is a few inches narrower

 

[GoToGuy]

2500 six lug, 7200 lbs, 9.5 " , 14 bolt. 8500 lb and up 10.5"

 

[evilunclegrimace]

2500 six lug, 7200 lbs, 9.5 " , 14 bolt. 8500 lb and up 10.5"

8600 GVW 9.5 or 10.5. depending on order options.
My 1988 K 3500 had a 9.5 in it.

 

[boy&hisdogs]

8600 GVW 9.5 or 10.5. depending on order options.
My 1988 K 3500 had a 9.5 in it.

They were inconsistent with the 9.5, you could have got it in anything. There was two or three different sizes of drum brakes too.

 

[evilunclegrimace]

The 9.5 came in the 5.7 equipped trucks unless you ordered the bigger diff, The 7.4 equpped trucks came with the 10.5 diff. ALL of the Dual rear wheel trucks got the bigger diff.

 

[GoToGuy]

So your 88 K3500 was not a dually?