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12-08-2008, 11:10 PM

kellysmith

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Join Date: Nov 2008

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dumb question

got a blazer from a friend and was wondering what the two D's (it shows park, reverse, neutral, letter d with a circle around it, and then another d) wonderin if the d with the circle around it is overdrive

12-08-2008, 11:22 PM

swartlkk

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Join Date: May 2005

Location: Waterloo, NY

Posts: 41,151

RE: dumb question

OD == Over Drive aka 4th gear which is a 0.7:1 gear ratio
D == Drive aka 3rd gear which is a 1:1 gear ratio
2 == 2nd gear which is a 1.75:1 gear ratio
1 == 1st gear which is a 3.06:1 gear ratio

12-08-2008, 11:25 PM

kellysmith

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Join Date: Nov 2008

Posts: 10

RE: dumb question

which should you drive in
normal conditions

12-08-2008, 11:31 PM

swartlkk

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Join Date: May 2005

Location: Waterloo, NY

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RE: dumb question

Always drive in OD unless you find that the transmission is constantly downshifting and then upshifting in short order.

12-09-2008, 02:37 AM

WolfPack

BF Veteran

Join Date: Oct 2007

Location: Raleigh, NC

Posts: 3,746

RE: dumb question

Kyle do you have the gear ratios for the NP233 t-case? Just trying to figure out a final drive ratio in 4lo vs 4hi

12-09-2008, 08:06 AM

swartlkk

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Join Date: May 2005

Location: Waterloo, NY

Posts: 41,151

RE: dumb question

Low range carries a 2.72:1 gear ratio in the transfer case for the NV233.

There are several good gear ratio calculators out there. THIS ONE just popped up first on a google search.