Differential ratio

1978 CHEVROLET
200,000 MILES • 5.7L • V8 • 4WD • AUTOMATIC
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WILLIAMSTHEME
  • MEMBER
  • 4 POSTS
Hi there,
I have a Blazer with 350 engine and automatic transmission. i have a question about matching differential. can i use the rear differential (12*45) with front differential (11*41) together without any problems?
The rear ratio is 3.75 and the front is 3.72.
Thanks for your helping.
Dec 6, 2016 at 7:23 PM
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CARADIODOC
  • ✓Experienced Mechanic
  • 34,408 POSTS
Nope. That will tear up the transfer case. The only way you might get away with that difference is if you only shift into four-wheel-drive when driving on ice or heavily-packed snow. At least one tire is going to have to be able to slide a little.
Dec 7, 2016 at 9:21 AM
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