02-20-2010, 08:30 PM | #1 |
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Join Date: Dec 2008
Location: Ashland, KY
Posts: 700
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Finally got a posi
I picked up a posi rear end out of a 68 today with 373 gears! It turned super easy and the springs in the posi unit still have the yellow paint on them! I paid 250 for the whole setup! The rearend is leaf but my truck is coil so will it be easier to swap the guts or modify the rearend the fit in the truck?
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68 C10 LWB 2/4 drop 406/th400/3.73posi 04 Silverado SS LQ9 6.0/4L65e/4.11posi AWD |
02-20-2010, 08:58 PM | #2 |
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Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,723
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Re: Finally got a posi
Swap the guts. If I was in your situation, I would buy a universal pinion depth checker from Summit or Jegs. About $100. Then I would measure the new rear for pinion depth and backlash. You then need to re-create those numbers in your existing housing when you swap the gears. This is the way to do it correctly.
You can run a pattern with marking compund and then swap guts and try to run it again and match it, but that is sketchy at best IMO, and I have setup probably 25 different diffs. I still find reading the pattern is tough, even after applying a load to the axles when rotating the pinion. The third option is just swap and hope. I did this early on in my rear axle career and found that the housings are pretty close. Close enough? Can't answer that, but it worked for me in a couple of instances.
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
02-20-2010, 09:36 PM | #3 |
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Join Date: Jan 2006
Location: Peyton, CO
Posts: 448
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Re: Finally got a posi
There is significantly more work in making a leaf-to-coil swap than using the pinion depth and backlash method, IMO. But, then again, I'm kind of a numbers guy, even though we've used the marking compound and pattern method before. Just take your time, get some good measurements and transfer to the new parts to the original housing! Good luck!!
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don "The DRBMan" 2014 Audi A4 (The Wife's Daily Driver) 2017 HD Ultra (The Cruiser) 2003 HD Fatboy (The Ride) 2001 Chevy Suburban (Another back up!!) For the first time in forever, not a single 67-72 Chevy truck, Blazer, or Suburban on the property! Basically retired and getting the new Motorhome ready for some traveling. Doing a bit of work on the house getting it ready to sell! LOL!! |
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