cause of drag?

66StangGuy · 03-03-2002, 04:23 AM

i have a 66 mustang coupe and was wondering what would be causing alot of drag. my car seems to slow quite fast if im not always on the gas. i dont think its the wheel bearing because those seem to be good. what about from the driveshaft. iv looked at it and it looks really dirty with just road gunk and dirt. any special stuff i can try on that. also what about transmission. if i go downhill in drive with foot off gas i slow pretty fast. if i do the same but in neutral i seem to coast much better and not slow as fast. anything i should try for this? anything i can try to help remove any friction? thanks in advance

Gearhead999 · 03-03-2002, 12:07 PM

I don't think you'll find the driveshaft causing drag.

More then likely I would look at the brakes for drag.

The transmission should have some drag in Drive. The newer O/D transmission have very little drag, unlike the older unoverdriven units, C-4, C-6, FMX.

Put the car in air and try hand spinning the wheels. That will show you where the drag is.

jwboner · 03-08-2002, 01:33 AM

You said that when in gear you slow down faster than when in neutral. That could be due to the axle ratio. The lower the gear (numerically higher) it will slow you down faster than a higher gear. When in neutral the axles are free-wheeling and the ratio doesn't affect how fast you slow down.

03-03-2002, 04:23 AM	#1
66StangGuy Registered Member Join Date: Feb 2002 Location: Diamond Bar Posts: 258	cause of drag? i have a 66 mustang coupe and was wondering what would be causing alot of drag. my car seems to slow quite fast if im not always on the gas. i dont think its the wheel bearing because those seem to be good. what about from the driveshaft. iv looked at it and it looks really dirty with just road gunk and dirt. any special stuff i can try on that. also what about transmission. if i go downhill in drive with foot off gas i slow pretty fast. if i do the same but in neutral i seem to coast much better and not slow as fast. anything i should try for this? anything i can try to help remove any friction? thanks in advance __________________ 66 mustang-292-Holley 4160-World Castings Windsor Sr.-Hooker super comp headers-MSD box & Coil.3.55 gears. B&M Z-Gate-Black leather racing seats with 4pt harnes.

03-03-2002, 12:07 PM	#2
Gearhead999 Registered Member Join Date: Sep 1998 Location: Oviedo, FL Posts: 992	I don't think you'll find the driveshaft causing drag. More then likely I would look at the brakes for drag. The transmission should have some drag in Drive. The newer O/D transmission have very little drag, unlike the older unoverdriven units, C-4, C-6, FMX. Put the car in air and try hand spinning the wheels. That will show you where the drag is. __________________ "Support our Troops" Dave 1968 Cougar 2004 Thunderbird 2007 F150 Harley-Davidson, SuperCrew 1986 LTD 1997 Ranger 1992 Honda Civic

03-08-2002, 01:33 AM	#3
jwboner Registered Member Join Date: Jun 2001 Location: Under the hood Posts: 164	You said that when in gear you slow down faster than when in neutral. That could be due to the axle ratio. The lower the gear (numerically higher) it will slow you down faster than a higher gear. When in neutral the axles are free-wheeling and the ratio doesn't affect how fast you slow down. __________________ 65 fastback 347 DFI injected w/vic jr, TFS heads, MSD, cable clutch TKO, 3.70 9", tc subframe conns, custom traction bars, griffen alum radiator, armored fuel cell, and torq thrust D's Retrofitted Prelude seats. Vintage Air underdash kit. Fiberglass here and there too More on the way all the time.

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