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11-29-2009, 02:20 PM
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#1 |
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Senior Member
Join Date: Jun 2007
Location: Pine Ridge Florida
Posts: 4,121
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72 Jimmy gear ratio
Are 4.10 gears common or uncommon in 4WD blazers and Jimmys?
I thought my Jimmy was sceaming on the highway. |
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11-29-2009, 08:19 PM
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#2 |
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Special Order
  
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,862
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Re: 72 Jimmy gear ratio
Somewhat common,but optional-only.Tell us more like tire size how fast you were going,and/or what rpm if you have a tach.
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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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11-30-2009, 07:31 PM
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#3 |
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Senior Member
Join Date: Jun 2007
Location: Pine Ridge Florida
Posts: 4,121
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Re: 72 Jimmy gear ratio
I am running 31 inch tires and do have a Tach dash. Going about 65 (most likely faster because of the bigger tires) and I swear it was reading about 32-3300 RPM. I know our Tachs are not the most acurate but I always assumed I had 3.73s. I did the spin the driveshaft just over 4 turns for 1 tire revolution so I assume 4.10s. I did the front axle also with the same results.
I need the info for a PCM tune for a future project (soon). |
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11-30-2009, 11:57 PM
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#4 |
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Certified Hobbiest
Join Date: Jul 2007
Location: Sacramento, Ca
Posts: 384
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Re: 72 Jimmy gear ratio
i spun my driveshaft 2 full turns for one tire rotation with a 38" tire and pulled to cover to make sure but it had 4.56s
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