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#1 |
PITbut
Join Date: Sep 2007
Location: monroe washington
Posts: 3,052
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What to look for when buying a used differential?
Im picking up a set of 3/4 ton axles here in the next few days. I have access to pop off the covers. What am i looking for inside there? Is there anything that if i see would make this a no deal?
I believe they are a 74 up 3/4 ton 4wd axle. 4.10 gears i believe.
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New project. 1971 Twin Turbo blazer http://67-72chevytrucks.com/vboard/s...d.php?t=676047 My new YOUTUBE channel.. Videos of my truck and a current walk around. Lyrikz74 Youtube channel DONE! SOLD! ![]() My 1971 stepside build thread My Build Thread UPDATED 6/11. DONE and sold. |
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#2 |
BlahBlahBlah
Join Date: Feb 2002
Location: Wa.
Posts: 19,881
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Re: What to look for when buying a used differential?
Are you going to put these under your Blazer? If so ... Cool!
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#3 |
PITbut
Join Date: Sep 2007
Location: monroe washington
Posts: 3,052
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Re: What to look for when buying a used differential?
Yes. I blame you. ahaha. We talked briefly about bigger axles on a rig you had and it didnt even cross my mind until then.
__________________
New project. 1971 Twin Turbo blazer http://67-72chevytrucks.com/vboard/s...d.php?t=676047 My new YOUTUBE channel.. Videos of my truck and a current walk around. Lyrikz74 Youtube channel DONE! SOLD! ![]() My 1971 stepside build thread My Build Thread UPDATED 6/11. DONE and sold. |
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#4 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,858
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Re: What to look for when buying a used differential?
Mostly look for water contamination, either present or previous (rust). Look for pitting and any general damage such as chips in teeth or burred edges. Also look for bluing on parts (weakened from heat)
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#5 | |
PITbut
Join Date: Sep 2007
Location: monroe washington
Posts: 3,052
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Re: What to look for when buying a used differential?
Quote:
Now say the diffs are messed up... Would 250 bucks for front and rear with the rims a decent deal even if i have to replace the diffs???
__________________
New project. 1971 Twin Turbo blazer http://67-72chevytrucks.com/vboard/s...d.php?t=676047 My new YOUTUBE channel.. Videos of my truck and a current walk around. Lyrikz74 Youtube channel DONE! SOLD! ![]() My 1971 stepside build thread My Build Thread UPDATED 6/11. DONE and sold. |
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#6 |
Registered User
Join Date: Jul 2016
Location: Olathe, KS
Posts: 267
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Re: What to look for when buying a used differential?
That's still a bit high for "junk" diff's.. it will cost you about $800-$1000 to have it rebuilt with new bearings and R&P (assuming the carrier is good) or more if you want to install a limited slip or locker. That's $125 for each, assuming it's junked. A junk one should be about $50 in my opinion.
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1970 GMC K2500 Dis-use is harder on a car than mis-use. |
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#7 | |
PITbut
Join Date: Sep 2007
Location: monroe washington
Posts: 3,052
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Re: What to look for when buying a used differential?
Quote:
I couldnt find any 3/4 tons... At all...
__________________
New project. 1971 Twin Turbo blazer http://67-72chevytrucks.com/vboard/s...d.php?t=676047 My new YOUTUBE channel.. Videos of my truck and a current walk around. Lyrikz74 Youtube channel DONE! SOLD! ![]() My 1971 stepside build thread My Build Thread UPDATED 6/11. DONE and sold. |
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#8 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,858
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Re: What to look for when buying a used differential?
when you find some, don't buy any with issues I described. The cost of repir far outweighs the value of the axles. If the seller is willing to give them to you once you discover issues, then maybe go for it. But you can find well sealed axles with no issues for fairly cheap. Possibly as cheap as $250-300. And all you do is put them in
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#9 |
Registered User
Join Date: Oct 2007
Location: Sammamish, WA
Posts: 2,115
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Re: What to look for when buying a used differential?
I have a 72 3/4 ton front end with 4:10's for $150. Just have the front end.
Located in sammamish. |
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#10 | |
PITbut
Join Date: Sep 2007
Location: monroe washington
Posts: 3,052
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Re: What to look for when buying a used differential?
Quote:
I will post up pics. Here is the numbers.. THe guy said they are 4.10 gears. Can you tell by these numbers?? I have yet to check the front differential. The axles are out of a 1979. ![]()
__________________
New project. 1971 Twin Turbo blazer http://67-72chevytrucks.com/vboard/s...d.php?t=676047 My new YOUTUBE channel.. Videos of my truck and a current walk around. Lyrikz74 Youtube channel DONE! SOLD! ![]() My 1971 stepside build thread My Build Thread UPDATED 6/11. DONE and sold. |
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#11 | |
PITbut
Join Date: Sep 2007
Location: monroe washington
Posts: 3,052
|
Re: What to look for when buying a used differential?
Quote:
__________________
New project. 1971 Twin Turbo blazer http://67-72chevytrucks.com/vboard/s...d.php?t=676047 My new YOUTUBE channel.. Videos of my truck and a current walk around. Lyrikz74 Youtube channel DONE! SOLD! ![]() My 1971 stepside build thread My Build Thread UPDATED 6/11. DONE and sold. |
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#12 |
Registered User
Join Date: Feb 2003
Location: Santa Ana, CA
Posts: 2,191
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Re: What to look for when buying a used differential?
My bit of advise was to make sure both axles have the same gear ratio. I once bought a set of axles that the seller swore were off the same truck. Ended up being 3.73 rear and 4.10 front - clearly not a matched set. If you have the covers off its as easy as counting the teeth on the ring gears and pinions. This will tell you that the axles are matched, as well as the ratio.
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#13 | |
PITbut
Join Date: Sep 2007
Location: monroe washington
Posts: 3,052
|
Re: What to look for when buying a used differential?
Quote:
__________________
New project. 1971 Twin Turbo blazer http://67-72chevytrucks.com/vboard/s...d.php?t=676047 My new YOUTUBE channel.. Videos of my truck and a current walk around. Lyrikz74 Youtube channel DONE! SOLD! ![]() My 1971 stepside build thread My Build Thread UPDATED 6/11. DONE and sold. |
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