9 bolt rear end? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jmac05 · 08-14-2002, 09:46 AM

I have seen alot of articles in magazines about certain restos using a F@rd 9-inch rear end. What is the 9" referring to? Also what does a posi do for me that a non-posi do?

MarineNav · 08-14-2002, 09:56 AM

A 9 inch rear end is refering to the size of the ring gear. A 9 inch is comonly used by racers because it has larger pinion size and is generally stronger than a gm 12 bolt (here we go!) A posi rear end basically makes both tires push the truck instead of one tire. A must have item for high horsepower/torque engines.

Jmac05 · 08-14-2002, 11:43 AM

So does the 9 inch have 9 bolts?

lost wages · 08-14-2002, 02:13 PM

no, it has a completely removable third member, we use them on our pro mods because you can change gears without setting up the back lash, etc, just unbolt it and put a different one on. They are fairly common and came under alot of fords. i have one under my 35, thought about doing it in my 68 also.

nate68 · 08-14-2002, 06:56 PM

the late 70's lincoln Mark V's are the same width as the 71-72 12 bolts and you get disc brakes and with a little modding a parking brake that's incredible (aka i can't move my truck with it on) and they're the same bolt pattern

08-14-2002, 09:46 AM	#1
Jmac05 L.E.D. Tail lights, Baby! Join Date: Jan 2002 Location: Corona, Ca Posts: 290	9 bolt rear end? I have seen alot of articles in magazines about certain restos using a F@rd 9-inch rear end. What is the 9" referring to? Also what does a posi do for me that a non-posi do? __________________ *Prov 3:5-8* "Hook 'em" L.E.D. Taillights for sale NOW!!! If interested, visit: www.earlyclassic.com or our website: www.jmcled.com All 67-72 GM Taillights are on sale untill 5 p.m. on Dec 15th, with Guaranteed Christmas delivery! joel.mcwaters@jmcled.com

08-14-2002, 09:56 AM	#2
MarineNav Official Beaver Inspector Join Date: Sep 2001 Location: MCAS Cherry Point, NC Posts: 119	A 9 inch rear end is refering to the size of the ring gear. A 9 inch is comonly used by racers because it has larger pinion size and is generally stronger than a gm 12 bolt (here we go!) A posi rear end basically makes both tires push the truck instead of one tire. A must have item for high horsepower/torque engines. __________________ 70' C-10SWB beater with a heater, one day haulin a$$ with class

08-14-2002, 11:43 AM	#3
Jmac05 L.E.D. Tail lights, Baby! Join Date: Jan 2002 Location: Corona, Ca Posts: 290	So does the 9 inch have 9 bolts? __________________ *Prov 3:5-8* "Hook 'em" L.E.D. Taillights for sale NOW!!! If interested, visit: www.earlyclassic.com or our website: www.jmcled.com All 67-72 GM Taillights are on sale untill 5 p.m. on Dec 15th, with Guaranteed Christmas delivery! joel.mcwaters@jmcled.com

08-14-2002, 06:56 PM	#5
nate68 Registered User Join Date: Jan 2000 Location: ca Posts: 1,110	the late 70's lincoln Mark V's are the same width as the 71-72 12 bolts and you get disc brakes and with a little modding a parking brake that's incredible (aka i can't move my truck with it on) and they're the same bolt pattern __________________ 68 short step, 406/700r4, 9" w/discs.

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08-14-2002, 02:13 PM	#4
lost wages Registered User Join Date: Apr 2001 Location: jefferson city, mo Posts: 1,364	no, it has a completely removable third member, we use them on our pro mods because you can change gears without setting up the back lash, etc, just unbolt it and put a different one on. They are fairly common and came under alot of fords. i have one under my 35, thought about doing it in my 68 also.



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