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Regearing and rebuilding my axles
I've been working on my 72 GMC Jimmy for a while. It now has a 4.8L, 6L90, and NP205. With the overdrive, I really need to do away with my 3.07 gearing.
I also broke a couple studs in the front axle, they are both open carrier, and I'm pretty sure nothing has been done to the suspension in its lifetime, so I need to redo pretty much everything. It has a 12 bolt in the rear and a Dana 44 up front. I am going with 4.10/4.11 gears, I have a posi for the rear, and I'll need a new carrier up front. I haven't decided if I want to spend a few hundred extra to get limited slip in the front or not, but I'll decide when it comes time to order parts. This is mostly a street truck. It will not see deep mud or rock crawling. It may see some overlanding use, but for the most part it is like a hunting rig. It has 33's on it now. I won't go any bigger because I won't lift it, but I may go back to a 31" tire. Please tell me if I've overlooked something: For the rear: Replace all bearings and seals Check pinion preload Check wear pattern (get shims for this) Replace leaf bushings Brakes have already been done, including frame to axle rubber line Check u-bolts for rust and corrosion Replace shocks For the front: Replace all bearings and seals, including wheel bearings Replace u-joints Replace brake discs New carrier Check wear pattern (get shims for this) Bearing pre-load Replace leaf spring bushings Check u-bolts Replace shocks Check steering stabilizer Check steering joints Rubber brake lines have been replaced Calipers were replaced 2 years ago Check for hub wear I plan on using timken bearings where I can. What brand of gears should I go with? Any good guides out there? My plan was to leave the axles installed and remove the leaf springs if I have trouble with the bushings. If I do this, I will replace the u-bolts. Thanks for any suggestions! |
Re: Regearing and rebuilding my axles
here play with this a bit . http://www.grimmjeeper.com/gears.html
at 70mph rpm = x 31" tires = 2084 33" tires = 1958 if you get a posi and no hard core wheeling look in to detroit true track . no clutches to wear out . lots of guys like them for street / light offroad / and specifically front axle use also . |
Re: Regearing and rebuilding my axles
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Re: Regearing and rebuilding my axles
Look up a place called Quick Performance in Ames IA.They quoted me 1280.00 for 2 posi units and gears,bearings, install kit ECT for my 72 k10. It's a Yukon gears, posi unit and all name brand stuff. On there web site there showing a truck 12 bolt Eaton posi, Yukon gears, bearings ECT for 620.00
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Re: Regearing and rebuilding my axles
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Good call on the thicker u-bolts, hadn't heard of people using bilstein shocks around here, solid spacer is good too. I'll look into the u-joint steering shaft too, my rag joint looks bad. |
Re: Regearing and rebuilding my axles
Just went through my front 44. Replaced all bearings except for the pinion. Went through Yukon for the carrier bearing set. Good USA Timkens in the kit along with inner axle seals, shims, grease paint and cover gasket. I only replaced the carrier bearings (water got in and pitted them) since the pinion was fine. I used a pry bar as a spreader which worked well.
Outer bearings were a different story. I wanted Timken as well. When I picked them up, the Timkens that I received said "Hecho en Chine" on the box. No thanks. The Koyos that were in it looked great, cleaned up well and went back in. The spindles got new Torringtons. U joints are the newer sealed Spicers without a Zerk. They'll be fine for what you're doing. If you have a press, you're all set. If not, try and find one cheap. The used one I got for 80$ has been used well more than 80$ worth. +1 on the bigger U Bolts. Almost any OTR truck supply will be able to make them for you in short order if not while you wait. Just bring your old ones with you for a template. I've used Betts Spring 30 minutes from home. Upper and lower ball joints were pretty bad when I started taking it apart. What I didn't know was that the drivers side knuckle had been damaged at some point living both of the ball joint "bores" wallowed out. Luckily I found a drivers side knuckle from a 10 bolt. Used Moog joints that were USA made. If you do the upper / lower joints, don't forget the little preload chingas that go in. They should be replaced ever time a new set of ball joints go in and have a special spanner for getting them torqued / preloaded right. Ive used the front axle quite a few times since I finished it and so far it works great. Even better, it's finally done and crossed off this list! Best of luck. |
Re: Regearing and rebuilding my axles
I recently did the 44 on my K20 as well and X2 on everything Chris said. The only issue I had with mine was the outer seal/slinger. The 44 on my truck was a first series which used the bronze slinger, the available seal kit comes with a plastic one which was the wrong diameter. One of them was scored badly but luckily I had a core with a single good slinger to donate. I was able to get USA Timken wheel bearings at my local autozone, maybe just old stock.
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