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#1 |
Mustang Enthusiast
Join Date: Mar 2002
Posts: 528
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![]() I have the problem with my speedo as most people here, I have bigger gears in the diff, but dont have the speedo gear to let my speedo know that I have bigger gears. I want to buy the right gear for my speedo, but since I bought my car after the gears were installed, I don't know what size the gears are. I'm pretty sure they are 3.73, but I dont want to buy the wrong gear. Is there any way of being able to tell, and if so how?
Last edited by Kamaro Killer; 04-01-2002 at 03:27 PM.. |
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#2 |
Registered Member
Join Date: May 2001
Location: Yuma, AZ
Posts: 536
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![]() well there are a couple of ways.
1. take your diff cover off and count the teeth on the ring and pinion, and then divide them to come up with the gear ratio. 2. put your car on jack stands with it in gear and make a mark on your driveshaft. Spin one of the rear tires one entire revolution and watch the drive shaft to tell how many revolutions it makes during the one tire revolution. If the driveshaft spins almost four complete times during the tire rotation, then you have 3.73's.
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Dave 88 GT - 13.4@106 on street tires (2.2 60ft) My Stang RHC member #75 My stang is FOR SALE!! |
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#3 |
College Stanger
Join Date: May 1999
Location: Aiken,south carolina, usa
Posts: 1,097
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![]() It should say on a tag on your axle.
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2003 Sonic Blue Cobra |
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#4 | |
Junior Member
Join Date: Mar 1999
Location: Ventura, California
Posts: 8,981
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![]() Quote:
Take care, -Chris
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Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local
RED & WHITE! |
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#5 | |
Registered Member
Join Date: May 2001
Location: Yuma, AZ
Posts: 536
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![]() Quote:
oops. hehe it's been a while since I did this. Didn't mean to mislead you. |
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#6 | |
Conservative Individualist
Join Date: May 1997
Location: Wherever I need to be
Posts: 7,487
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![]() Quote:
Use the 'marked driveshaft/one tire rotation' method to determine rear diff ratios, especially on older Mustangs that very often have aftermarket gears installed as this is a basic Mustang mod. |
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#7 |
Registered Member
Join Date: Jan 2002
Posts: 62
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![]() i just got done and the driveshaft passed 3 1/2 times what size grears do i have i would think 355 if four full truns is 373
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#8 |
Don Corlione
Join Date: Jun 2001
Location: Omaha NE USA
Posts: 491
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![]() 3.5 rotations = 3.55
3.75 rotations = 3.73 4 rotations = 4.10 or possibly a 3.90, but I'm not aware of a 3.90 gear available for the 8.8 rearend.
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Eric - 89 Mustang LX coupe 5 speed 302-Cobra Intake-GT40p heads-TFS stage 1 cam-FRPP 1.6 roller rockers-3:73 gears-KYB shocks and struts-Eibach Pro-kit-HPM Mega-bite upper and lower control arms-FRPP aluminum driveshaft-16x8 Chrome Cobra Rs R.H.C. #14 |
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Thread | Thread Starter | Forum | Replies | Last Post |
Gears Gears Gears!!!! | COBRAon18s | Modular Madness | 20 | 05-13-2002 04:44 PM |
wheel size | fordkid68 | Classic Mustangs | 0 | 03-10-2002 03:28 PM |
Gears, need help!!!! | Edgar Negron | Windsor Power | 3 | 05-27-2001 03:10 PM |
Gears Gears Gears | Skyman | Windsor Power | 6 | 03-11-2001 11:39 PM |
Nitto tire size, wheel size, etc. | 2FastLX | Windsor Power | 7 | 02-15-2001 04:04 AM |