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04-11-2006, 01:10 AM
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Member
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Join Date: Oct 26, 2003
Location: Wilmington,NC
Posts: 60
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Hello all!I need some info. hope you can help.I have an '85 gmc truck ; NP 205 t/case,4.56 gears, 35" tires.Speedo way off. anyone know what gears I need? THANKS
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04-11-2006, 02:11 AM
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FSJ Maniac
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Join Date: Dec 06, 2005
Location: Fort Crawlins CO
Posts: 3,447
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Are you talking about speedo gears or diff gears?
If speedo gears, I have no idea.
If diff gears, I would have to know the stock tire size.
__________________
"Brutus" '74 J10 360/T18/D20/Front D60 Pro Rock & ARB/2" shave, ARB, 15 bolt FF Rear/ 4.56 Gears/38.5 x 16 TSL
Current Jeep Status:Under The Knife
Current Homepage Status: RUNNING
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04-11-2006, 03:05 AM
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Member
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Join Date: Oct 26, 2003
Location: Wilmington,NC
Posts: 60
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sorry,yeah I'm happy with the 4.56 gears I put in. I'm trying to correct the speedo. I'm confident that someone here is running that setup in a full size jeep, doubler or whatnot. is the inner (drive) gear plastic? I don't know what I need.
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04-11-2006, 05:19 AM
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Member
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Join Date: Oct 26, 2003
Location: Wilmington,NC
Posts: 60
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My mistake! I have the NP 208. sorry
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04-11-2006, 11:49 AM
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FSJ Maniac
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Join Date: Jul 18, 2003
Location: Cullman, AL
Posts: 4,477
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http://www.raingler.com/tech/speedoChart.asp
Now I have no idea if it is the same or not, but according to this chart I found, for 4.56 gears and 35in tires you need a 37 tooth gear. But be warned, I got this chart from a jeep wrangler website, and its used to find the correct gear for them. So it may or may not be correct for your chevy. But it might give you a place to start.
[ April 11, 2006, 05:51 PM: Message edited by: JeepsAndGuns ]
__________________
79 Cherokee Chief 401/T18/D20, MPFI fuel injection, hydroboost, otherwise stock.
Future mods: Caddy 500/NV4500/NP205, HP D60 front D60 smooth botom rear, 5.13 gears, 35x12.50's on re-centered H1 beadlock wheels. Warn M12000 winch.
93 Wrangler 4.0L/AX15/NP231,SYE,CV, OME 2.5 lift, WJ knuckles and brakes, 31X10.50's Warn M10000 winch.
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04-11-2006, 11:54 PM
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Member
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Join Date: Oct 26, 2003
Location: Wilmington,NC
Posts: 60
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I had my gears out. The inner (drive) gear is blue 18 tooth and the driven gear is black 40 teeth. by my math (with an online calculator). My speedo says I am going 70mph when I am going 55. I would need a 51 tooth driven gear. the most I can find at the GM dealer I work at is 44 teeth. They made a 15 tooth drive gear (discontinued). If I had that and a 42 tooth driven gear I think I would have what I need. Does anyone have a gray 15 tooth drive gear or know where to get one? THANKS
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